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- /* random.c
- *
- * Copyright (C) 2006-2023 wolfSSL Inc.
- *
- * This file is part of wolfSSL.
- *
- * wolfSSL is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * wolfSSL is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
- */
- /*
- DESCRIPTION
- This library contains implementation for the random number generator.
- */
- #ifdef HAVE_CONFIG_H
- #include <config.h>
- #endif
- #include <wolfssl/wolfcrypt/settings.h>
- #include <wolfssl/wolfcrypt/error-crypt.h>
- /* on HPUX 11 you may need to install /dev/random see
- http://h20293.www2.hp.com/portal/swdepot/displayProductInfo.do?productNumber=KRNG11I
- */
- #if defined(ESP_IDF_VERSION_MAJOR) && ESP_IDF_VERSION_MAJOR >= 5
- #include <esp_random.h>
- #endif
- #if defined(HAVE_FIPS) && \
- defined(HAVE_FIPS_VERSION) && (HAVE_FIPS_VERSION >= 2)
- /* set NO_WRAPPERS before headers, use direct internal f()s not wrappers */
- #define FIPS_NO_WRAPPERS
- #ifdef USE_WINDOWS_API
- #pragma code_seg(".fipsA$c")
- #pragma const_seg(".fipsB$c")
- #endif
- #endif
- #include <wolfssl/wolfcrypt/random.h>
- #include <wolfssl/wolfcrypt/cpuid.h>
- #ifdef HAVE_ENTROPY_MEMUSE
- #include <wolfssl/wolfcrypt/sha3.h>
- #if defined(__APPLE__) || defined(__MACH__)
- #include <mach/mach_time.h>
- #endif
- #endif
- #ifndef WC_NO_RNG /* if not FIPS and RNG is disabled then do not compile */
- #include <wolfssl/wolfcrypt/sha256.h>
- #ifdef WOLF_CRYPTO_CB
- #include <wolfssl/wolfcrypt/cryptocb.h>
- #endif
- #ifdef NO_INLINE
- #include <wolfssl/wolfcrypt/misc.h>
- #else
- #define WOLFSSL_MISC_INCLUDED
- #include <wolfcrypt/src/misc.c>
- #endif
- #if defined(WOLFSSL_SGX)
- #include <sgx_trts.h>
- #elif defined(USE_WINDOWS_API)
- #ifndef _WIN32_WINNT
- #define _WIN32_WINNT 0x0400
- #endif
- #include <windows.h>
- #include <wincrypt.h>
- #elif defined(HAVE_WNR)
- #include <wnr.h>
- #include <wolfssl/wolfcrypt/logging.h>
- wolfSSL_Mutex wnr_mutex; /* global netRandom mutex */
- int wnr_timeout = 0; /* entropy timeout, milliseconds */
- int wnr_mutex_init = 0; /* flag for mutex init */
- wnr_context* wnr_ctx; /* global netRandom context */
- #elif defined(FREESCALE_KSDK_2_0_TRNG)
- #include "fsl_trng.h"
- #elif defined(FREESCALE_KSDK_2_0_RNGA)
- #include "fsl_rnga.h"
- #elif defined(WOLFSSL_WICED)
- #include "wiced_crypto.h"
- #elif defined(WOLFSSL_NETBURNER)
- #include <predef.h>
- #include <basictypes.h>
- #include <random.h>
- #elif defined(WOLFSSL_XILINX_CRYPT_VERSAL)
- #include "wolfssl/wolfcrypt/port/xilinx/xil-versal-trng.h"
- #elif defined(NO_DEV_RANDOM)
- #elif defined(CUSTOM_RAND_GENERATE)
- #elif defined(CUSTOM_RAND_GENERATE_BLOCK)
- #elif defined(CUSTOM_RAND_GENERATE_SEED)
- #elif defined(WOLFSSL_GENSEED_FORTEST)
- #elif defined(WOLFSSL_MDK_ARM)
- #elif defined(WOLFSSL_IAR_ARM)
- #elif defined(WOLFSSL_ROWLEY_ARM)
- #elif defined(WOLFSSL_EMBOS)
- #elif defined(WOLFSSL_DEOS)
- #elif defined(MICRIUM)
- #elif defined(WOLFSSL_NUCLEUS)
- #elif defined(WOLFSSL_PB)
- #elif defined(WOLFSSL_ZEPHYR)
- #elif defined(WOLFSSL_TELIT_M2MB)
- #elif defined(WOLFSSL_SCE) && !defined(WOLFSSL_SCE_NO_TRNG)
- #elif defined(WOLFSSL_IMXRT1170_CAAM)
- #elif defined(WOLFSSL_GETRANDOM)
- #include <errno.h>
- #include <sys/random.h>
- #else
- /* include headers that may be needed to get good seed */
- #include <fcntl.h>
- #ifndef EBSNET
- #include <unistd.h>
- #endif
- #endif
- #if defined(WOLFSSL_SILABS_SE_ACCEL)
- #include <wolfssl/wolfcrypt/port/silabs/silabs_random.h>
- #endif
- #if defined(WOLFSSL_IOTSAFE) && defined(HAVE_IOTSAFE_HWRNG)
- #include <wolfssl/wolfcrypt/port/iotsafe/iotsafe.h>
- #endif
- #if defined(WOLFSSL_HAVE_PSA) && !defined(WOLFSSL_PSA_NO_RNG)
- #include <wolfssl/wolfcrypt/port/psa/psa.h>
- #endif
- #if defined(HAVE_INTEL_RDRAND) || defined(HAVE_INTEL_RDSEED) || \
- defined(HAVE_AMD_RDSEED)
- static word32 intel_flags = 0;
- static void wc_InitRng_IntelRD(void)
- {
- intel_flags = cpuid_get_flags();
- }
- #if (defined(HAVE_INTEL_RDSEED) || defined(HAVE_AMD_RDSEED)) && \
- !defined(WOLFSSL_LINUXKM)
- static int wc_GenerateSeed_IntelRD(OS_Seed* os, byte* output, word32 sz);
- #endif
- #ifdef HAVE_INTEL_RDRAND
- static int wc_GenerateRand_IntelRD(OS_Seed* os, byte* output, word32 sz);
- #endif
- #ifdef USE_WINDOWS_API
- #define USE_INTEL_INTRINSICS
- #elif !defined __GNUC__ || defined __clang__ || __GNUC__ > 4
- #define USE_INTEL_INTRINSICS
- #else
- #undef USE_INTEL_INTRINSICS
- #endif
- #ifdef USE_INTEL_INTRINSICS
- #include <immintrin.h>
- /* Before clang 7 or GCC 9, immintrin.h did not define _rdseed64_step() */
- #ifndef HAVE_INTEL_RDSEED
- #elif defined __clang__ && __clang_major__ > 6
- #elif !defined __GNUC__
- #elif __GNUC__ > 8
- #else
- #ifndef __clang__
- #pragma GCC push_options
- #pragma GCC target("rdseed")
- #else
- #define __RDSEED__
- #endif
- #include <x86intrin.h>
- #ifndef __clang__
- #pragma GCC pop_options
- #endif
- #endif
- #endif /* USE_WINDOWS_API */
- #endif
- /* Start NIST DRBG code */
- #ifdef HAVE_HASHDRBG
- #define OUTPUT_BLOCK_LEN (WC_SHA256_DIGEST_SIZE)
- #define MAX_REQUEST_LEN (0x10000)
- #define RESEED_INTERVAL WC_RESEED_INTERVAL
- /* The security strength for the RNG is the target number of bits of
- * entropy you are looking for in a seed. */
- #ifndef RNG_SECURITY_STRENGTH
- /* SHA-256 requires a minimum of 256-bits of entropy. */
- #define RNG_SECURITY_STRENGTH (256)
- #endif
- #ifndef ENTROPY_SCALE_FACTOR
- /* The entropy scale factor should be the whole number inverse of the
- * minimum bits of entropy per bit of NDRNG output. */
- #if defined(HAVE_ENTROPY_MEMUSE)
- /* Full strength, conditioned entropy is requested of MemUse Entropy. */
- #if defined(HAVE_FIPS) && defined(HAVE_FIPS_VERSION) && \
- (HAVE_FIPS_VERSION >= 2)
- #define ENTROPY_SCALE_FACTOR (4)
- #else
- #define ENTROPY_SCALE_FACTOR (1)
- #endif
- #elif defined(HAVE_AMD_RDSEED)
- /* This will yield a SEED_SZ of 16kb. Since nonceSz will be 0,
- * we'll add an additional 8kb on top. */
- #define ENTROPY_SCALE_FACTOR (512)
- #elif defined(HAVE_INTEL_RDSEED) || defined(HAVE_INTEL_RDRAND)
- /* The value of 2 applies to Intel's RDSEED which provides about
- * 0.5 bits minimum of entropy per bit. The value of 4 gives a
- * conservative margin for FIPS. */
- #if defined(HAVE_FIPS) && defined(HAVE_FIPS_VERSION) && \
- (HAVE_FIPS_VERSION >= 2)
- #define ENTROPY_SCALE_FACTOR (2*4)
- #else
- /* Not FIPS, but Intel RDSEED, only double. */
- #define ENTROPY_SCALE_FACTOR (2)
- #endif
- #elif defined(HAVE_FIPS) && defined(HAVE_FIPS_VERSION) && \
- (HAVE_FIPS_VERSION >= 2)
- /* If doing a FIPS build without a specific scale factor, default
- * to 4. This will give 1024 bits of entropy. More is better, but
- * more is also slower. */
- #define ENTROPY_SCALE_FACTOR (4)
- #else
- /* Setting the default to 1. */
- #define ENTROPY_SCALE_FACTOR (1)
- #endif
- #endif
- #ifndef SEED_BLOCK_SZ
- /* The seed block size, is the size of the output of the underlying NDRNG.
- * This value is used for testing the output of the NDRNG. */
- #if defined(HAVE_AMD_RDSEED)
- /* AMD's RDSEED instruction works in 128-bit blocks read 64-bits
- * at a time. */
- #define SEED_BLOCK_SZ (sizeof(word64)*2)
- #elif defined(HAVE_INTEL_RDSEED) || defined(HAVE_INTEL_RDRAND)
- /* RDSEED outputs in blocks of 64-bits. */
- #define SEED_BLOCK_SZ sizeof(word64)
- #else
- /* Setting the default to 4. */
- #define SEED_BLOCK_SZ 4
- #endif
- #endif
- #define SEED_SZ (RNG_SECURITY_STRENGTH*ENTROPY_SCALE_FACTOR/8)
- /* The maximum seed size will be the seed size plus a seed block for the
- * test, and an additional half of the seed size. This additional half
- * is in case the user does not supply a nonce. A nonce will be obtained
- * from the NDRNG. */
- #define MAX_SEED_SZ (SEED_SZ + SEED_SZ/2 + SEED_BLOCK_SZ)
- #ifdef WC_RNG_SEED_CB
- static wc_RngSeed_Cb seedCb = NULL;
- int wc_SetSeed_Cb(wc_RngSeed_Cb cb)
- {
- seedCb = cb;
- return 0;
- }
- #endif
- /* Internal return codes */
- #define DRBG_SUCCESS 0
- #define DRBG_FAILURE 1
- #define DRBG_NEED_RESEED 2
- #define DRBG_CONT_FAILURE 3
- #define DRBG_NO_SEED_CB 4
- /* RNG health states */
- #define DRBG_NOT_INIT 0
- #define DRBG_OK 1
- #define DRBG_FAILED 2
- #define DRBG_CONT_FAILED 3
- #define RNG_HEALTH_TEST_CHECK_SIZE (WC_SHA256_DIGEST_SIZE * 4)
- /* Verify max gen block len */
- #if RNG_MAX_BLOCK_LEN > MAX_REQUEST_LEN
- #error RNG_MAX_BLOCK_LEN is larger than NIST DBRG max request length
- #endif
- enum {
- drbgInitC = 0,
- drbgReseed = 1,
- drbgGenerateW = 2,
- drbgGenerateH = 3,
- drbgInitV = 4
- };
- typedef struct DRBG_internal DRBG_internal;
- static int wc_RNG_HealthTestLocal(int reseed);
- /* Hash Derivation Function */
- /* Returns: DRBG_SUCCESS or DRBG_FAILURE */
- static int Hash_df(DRBG_internal* drbg, byte* out, word32 outSz, byte type,
- const byte* inA, word32 inASz,
- const byte* inB, word32 inBSz)
- {
- int ret = DRBG_FAILURE;
- byte ctr;
- word32 i;
- word32 len;
- word32 bits = (outSz * 8); /* reverse byte order */
- #ifdef WOLFSSL_SMALL_STACK_CACHE
- wc_Sha256* sha = &drbg->sha256;
- #else
- wc_Sha256 sha[1];
- #endif
- #ifdef WOLFSSL_SMALL_STACK
- byte* digest;
- #else
- byte digest[WC_SHA256_DIGEST_SIZE];
- #endif
- if (drbg == NULL) {
- return DRBG_FAILURE;
- }
- #ifdef WOLFSSL_SMALL_STACK
- digest = (byte*)XMALLOC(WC_SHA256_DIGEST_SIZE, drbg->heap,
- DYNAMIC_TYPE_DIGEST);
- if (digest == NULL)
- return DRBG_FAILURE;
- #endif
- #ifdef LITTLE_ENDIAN_ORDER
- bits = ByteReverseWord32(bits);
- #endif
- len = (outSz / OUTPUT_BLOCK_LEN)
- + ((outSz % OUTPUT_BLOCK_LEN) ? 1 : 0);
- ctr = 1;
- for (i = 0; i < len; i++) {
- #ifndef WOLFSSL_SMALL_STACK_CACHE
- #if defined(WOLFSSL_ASYNC_CRYPT) || defined(WOLF_CRYPTO_CB)
- ret = wc_InitSha256_ex(sha, drbg->heap, drbg->devId);
- #else
- ret = wc_InitSha256(sha);
- #endif
- if (ret != 0)
- break;
- #endif
- ret = wc_Sha256Update(sha, &ctr, sizeof(ctr));
- if (ret == 0) {
- ctr++;
- ret = wc_Sha256Update(sha, (byte*)&bits, sizeof(bits));
- }
- if (ret == 0) {
- /* churning V is the only string that doesn't have the type added */
- if (type != drbgInitV)
- ret = wc_Sha256Update(sha, &type, sizeof(type));
- }
- if (ret == 0)
- ret = wc_Sha256Update(sha, inA, inASz);
- if (ret == 0) {
- if (inB != NULL && inBSz > 0)
- ret = wc_Sha256Update(sha, inB, inBSz);
- }
- if (ret == 0)
- ret = wc_Sha256Final(sha, digest);
- #ifndef WOLFSSL_SMALL_STACK_CACHE
- wc_Sha256Free(sha);
- #endif
- if (ret == 0) {
- if (outSz > OUTPUT_BLOCK_LEN) {
- XMEMCPY(out, digest, OUTPUT_BLOCK_LEN);
- outSz -= OUTPUT_BLOCK_LEN;
- out += OUTPUT_BLOCK_LEN;
- }
- else {
- XMEMCPY(out, digest, outSz);
- }
- }
- }
- ForceZero(digest, WC_SHA256_DIGEST_SIZE);
- #ifdef WOLFSSL_SMALL_STACK
- XFREE(digest, drbg->heap, DYNAMIC_TYPE_DIGEST);
- #endif
- return (ret == 0) ? DRBG_SUCCESS : DRBG_FAILURE;
- }
- /* Returns: DRBG_SUCCESS or DRBG_FAILURE */
- static int Hash_DRBG_Reseed(DRBG_internal* drbg, const byte* seed, word32 seedSz)
- {
- int ret;
- #ifdef WOLFSSL_SMALL_STACK
- byte* newV;
- #else
- byte newV[DRBG_SEED_LEN];
- #endif
- if (drbg == NULL) {
- return DRBG_FAILURE;
- }
- #ifdef WOLFSSL_SMALL_STACK
- newV = (byte*)XMALLOC(DRBG_SEED_LEN, drbg->heap, DYNAMIC_TYPE_TMP_BUFFER);
- if (newV == NULL) {
- return MEMORY_E;
- }
- #endif
- XMEMSET(newV, 0, DRBG_SEED_LEN);
- ret = Hash_df(drbg, newV, DRBG_SEED_LEN, drbgReseed,
- drbg->V, sizeof(drbg->V), seed, seedSz);
- if (ret == DRBG_SUCCESS) {
- XMEMCPY(drbg->V, newV, sizeof(drbg->V));
- ForceZero(newV, DRBG_SEED_LEN);
- ret = Hash_df(drbg, drbg->C, sizeof(drbg->C), drbgInitC, drbg->V,
- sizeof(drbg->V), NULL, 0);
- }
- if (ret == DRBG_SUCCESS) {
- drbg->reseedCtr = 1;
- }
- #ifdef WOLFSSL_SMALL_STACK
- XFREE(newV, drbg->heap, DYNAMIC_TYPE_TMP_BUFFER);
- #endif
- return ret;
- }
- /* Returns: DRBG_SUCCESS and DRBG_FAILURE or BAD_FUNC_ARG on fail */
- int wc_RNG_DRBG_Reseed(WC_RNG* rng, const byte* seed, word32 seedSz)
- {
- if (rng == NULL || seed == NULL) {
- return BAD_FUNC_ARG;
- }
- if (rng->drbg == NULL) {
- #if defined(HAVE_INTEL_RDSEED) || defined(HAVE_INTEL_RDRAND)
- if (IS_INTEL_RDRAND(intel_flags)) {
- /* using RDRAND not DRBG, so return success */
- return 0;
- }
- return BAD_FUNC_ARG;
- #endif
- }
- return Hash_DRBG_Reseed((DRBG_internal *)rng->drbg, seed, seedSz);
- }
- static WC_INLINE void array_add_one(byte* data, word32 dataSz)
- {
- int i;
- for (i = (int)dataSz - 1; i >= 0; i--) {
- data[i]++;
- if (data[i] != 0) break;
- }
- }
- /* Returns: DRBG_SUCCESS or DRBG_FAILURE */
- static int Hash_gen(DRBG_internal* drbg, byte* out, word32 outSz, const byte* V)
- {
- int ret = DRBG_FAILURE;
- #ifdef WOLFSSL_SMALL_STACK
- byte* data;
- byte* digest;
- #else
- byte data[DRBG_SEED_LEN];
- byte digest[WC_SHA256_DIGEST_SIZE];
- #endif
- word32 i;
- word32 len;
- #ifdef WOLFSSL_SMALL_STACK_CACHE
- wc_Sha256* sha = &drbg->sha256;
- #else
- wc_Sha256 sha[1];
- #endif
- if (drbg == NULL) {
- return DRBG_FAILURE;
- }
- #ifdef WOLFSSL_SMALL_STACK
- data = (byte*)XMALLOC(DRBG_SEED_LEN, drbg->heap, DYNAMIC_TYPE_TMP_BUFFER);
- digest = (byte*)XMALLOC(WC_SHA256_DIGEST_SIZE, drbg->heap,
- DYNAMIC_TYPE_DIGEST);
- if (data == NULL || digest == NULL) {
- XFREE(digest, drbg->heap, DYNAMIC_TYPE_DIGEST);
- XFREE(data, drbg->heap, DYNAMIC_TYPE_TMP_BUFFER);
- return DRBG_FAILURE;
- }
- #endif
- /* Special case: outSz is 0 and out is NULL. wc_Generate a block to save for
- * the continuous test. */
- if (outSz == 0) {
- outSz = 1;
- }
- len = (outSz / OUTPUT_BLOCK_LEN) + ((outSz % OUTPUT_BLOCK_LEN) ? 1 : 0);
- XMEMCPY(data, V, DRBG_SEED_LEN);
- for (i = 0; i < len; i++) {
- #ifndef WOLFSSL_SMALL_STACK_CACHE
- #if defined(WOLFSSL_ASYNC_CRYPT) || defined(WOLF_CRYPTO_CB)
- ret = wc_InitSha256_ex(sha, drbg->heap, drbg->devId);
- #else
- ret = wc_InitSha256(sha);
- #endif
- if (ret == 0)
- #endif
- ret = wc_Sha256Update(sha, data, DRBG_SEED_LEN);
- if (ret == 0)
- ret = wc_Sha256Final(sha, digest);
- #ifndef WOLFSSL_SMALL_STACK_CACHE
- wc_Sha256Free(sha);
- #endif
- if (ret == 0) {
- if (out != NULL && outSz != 0) {
- if (outSz >= OUTPUT_BLOCK_LEN) {
- XMEMCPY(out, digest, OUTPUT_BLOCK_LEN);
- outSz -= OUTPUT_BLOCK_LEN;
- out += OUTPUT_BLOCK_LEN;
- array_add_one(data, DRBG_SEED_LEN);
- }
- else {
- XMEMCPY(out, digest, outSz);
- outSz = 0;
- }
- }
- }
- else {
- /* wc_Sha256Update or wc_Sha256Final returned error */
- break;
- }
- }
- ForceZero(data, DRBG_SEED_LEN);
- #ifdef WOLFSSL_SMALL_STACK
- XFREE(digest, drbg->heap, DYNAMIC_TYPE_DIGEST);
- XFREE(data, drbg->heap, DYNAMIC_TYPE_TMP_BUFFER);
- #endif
- return (ret == 0) ? DRBG_SUCCESS : DRBG_FAILURE;
- }
- static WC_INLINE void array_add(byte* d, word32 dLen, const byte* s, word32 sLen)
- {
- if (dLen > 0 && sLen > 0 && dLen >= sLen) {
- int sIdx, dIdx;
- word16 carry = 0;
- dIdx = (int)dLen - 1;
- for (sIdx = (int)sLen - 1; sIdx >= 0; sIdx--) {
- carry += (word16)(d[dIdx] + s[sIdx]);
- d[dIdx] = (byte)carry;
- carry >>= 8;
- dIdx--;
- }
- for (; dIdx >= 0; dIdx--) {
- carry += (word16)d[dIdx];
- d[dIdx] = (byte)carry;
- carry >>= 8;
- }
- }
- }
- /* Returns: DRBG_SUCCESS, DRBG_NEED_RESEED, or DRBG_FAILURE */
- static int Hash_DRBG_Generate(DRBG_internal* drbg, byte* out, word32 outSz)
- {
- int ret;
- #ifdef WOLFSSL_SMALL_STACK_CACHE
- wc_Sha256* sha = &drbg->sha256;
- #else
- wc_Sha256 sha[1];
- #endif
- byte type;
- word32 reseedCtr;
- if (drbg == NULL) {
- return DRBG_FAILURE;
- }
- if (drbg->reseedCtr == RESEED_INTERVAL) {
- return DRBG_NEED_RESEED;
- }
- else {
- #ifndef WOLFSSL_SMALL_STACK
- byte digest[WC_SHA256_DIGEST_SIZE];
- #else
- byte* digest = (byte*)XMALLOC(WC_SHA256_DIGEST_SIZE, drbg->heap,
- DYNAMIC_TYPE_DIGEST);
- if (digest == NULL)
- return DRBG_FAILURE;
- #endif
- type = drbgGenerateH;
- reseedCtr = drbg->reseedCtr;
- ret = Hash_gen(drbg, out, outSz, drbg->V);
- if (ret == DRBG_SUCCESS) {
- #ifndef WOLFSSL_SMALL_STACK_CACHE
- #if defined(WOLFSSL_ASYNC_CRYPT) || defined(WOLF_CRYPTO_CB)
- ret = wc_InitSha256_ex(sha, drbg->heap, drbg->devId);
- #else
- ret = wc_InitSha256(sha);
- #endif
- if (ret == 0)
- #endif
- ret = wc_Sha256Update(sha, &type, sizeof(type));
- if (ret == 0)
- ret = wc_Sha256Update(sha, drbg->V, sizeof(drbg->V));
- if (ret == 0)
- ret = wc_Sha256Final(sha, digest);
- #ifndef WOLFSSL_SMALL_STACK_CACHE
- wc_Sha256Free(sha);
- #endif
- if (ret == 0) {
- array_add(drbg->V, sizeof(drbg->V), digest, WC_SHA256_DIGEST_SIZE);
- array_add(drbg->V, sizeof(drbg->V), drbg->C, sizeof(drbg->C));
- #ifdef LITTLE_ENDIAN_ORDER
- reseedCtr = ByteReverseWord32(reseedCtr);
- #endif
- array_add(drbg->V, sizeof(drbg->V),
- (byte*)&reseedCtr, sizeof(reseedCtr));
- ret = DRBG_SUCCESS;
- }
- drbg->reseedCtr++;
- }
- ForceZero(digest, WC_SHA256_DIGEST_SIZE);
- #ifdef WOLFSSL_SMALL_STACK
- XFREE(digest, drbg->heap, DYNAMIC_TYPE_DIGEST);
- #endif
- }
- return (ret == 0) ? DRBG_SUCCESS : DRBG_FAILURE;
- }
- /* Returns: DRBG_SUCCESS or DRBG_FAILURE */
- static int Hash_DRBG_Instantiate(DRBG_internal* drbg, const byte* seed, word32 seedSz,
- const byte* nonce, word32 nonceSz,
- void* heap, int devId)
- {
- int ret = DRBG_FAILURE;
- XMEMSET(drbg, 0, sizeof(DRBG_internal));
- drbg->heap = heap;
- #if defined(WOLFSSL_ASYNC_CRYPT) || defined(WOLF_CRYPTO_CB)
- drbg->devId = devId;
- #else
- (void)devId;
- #endif
- #ifdef WOLFSSL_SMALL_STACK_CACHE
- #if defined(WOLFSSL_ASYNC_CRYPT) || defined(WOLF_CRYPTO_CB)
- ret = wc_InitSha256_ex(&drbg->sha256, drbg->heap, drbg->devId);
- #else
- ret = wc_InitSha256(&drbg->sha256);
- #endif
- if (ret != 0)
- return ret;
- #endif
- if (Hash_df(drbg, drbg->V, sizeof(drbg->V), drbgInitV, seed, seedSz,
- nonce, nonceSz) == DRBG_SUCCESS &&
- Hash_df(drbg, drbg->C, sizeof(drbg->C), drbgInitC, drbg->V,
- sizeof(drbg->V), NULL, 0) == DRBG_SUCCESS) {
- drbg->reseedCtr = 1;
- ret = DRBG_SUCCESS;
- }
- return ret;
- }
- /* Returns: DRBG_SUCCESS or DRBG_FAILURE */
- static int Hash_DRBG_Uninstantiate(DRBG_internal* drbg)
- {
- word32 i;
- int compareSum = 0;
- byte* compareDrbg = (byte*)drbg;
- #ifdef WOLFSSL_SMALL_STACK_CACHE
- wc_Sha256Free(&drbg->sha256);
- #endif
- ForceZero(drbg, sizeof(DRBG_internal));
- for (i = 0; i < sizeof(DRBG_internal); i++) {
- compareSum |= compareDrbg[i] ^ 0;
- }
- return (compareSum == 0) ? DRBG_SUCCESS : DRBG_FAILURE;
- }
- int wc_RNG_TestSeed(const byte* seed, word32 seedSz)
- {
- int ret = 0;
- /* Check the seed for duplicate words. */
- word32 seedIdx = 0;
- word32 scratchSz = min(SEED_BLOCK_SZ, seedSz - SEED_BLOCK_SZ);
- while (seedIdx < seedSz - SEED_BLOCK_SZ) {
- if (ConstantCompare(seed + seedIdx,
- seed + seedIdx + scratchSz,
- (int)scratchSz) == 0) {
- ret = DRBG_CONT_FAILURE;
- }
- seedIdx += SEED_BLOCK_SZ;
- scratchSz = min(SEED_BLOCK_SZ, (seedSz - seedIdx));
- }
- return ret;
- }
- #endif /* HAVE_HASHDRBG */
- /* End NIST DRBG Code */
- #ifdef HAVE_ENTROPY_MEMUSE
- /* Define ENTROPY_MEMUSE_THREAD to force use of counter in a new thread.
- * Only do this when high resolution timer not otherwise available.
- */
- /* Number of bytes that will hold the maximum entropy bits. */
- #define MAX_ENTROPY_BYTES (MAX_ENTROPY_BITS / 8)
- /* Number of bits stored for one sample. */
- #define ENTROPY_BITS_USED 8
- /* Minimum entropy from a sample. */
- #define ENTROPY_MIN 1
- /* Number of extra samples to ensure full entropy. */
- #define ENTROPY_EXTRA 64
- /* Maximum number of bytes to sample to produce max entropy. */
- #define MAX_NOISE_CNT (MAX_ENTROPY_BITS * 8 + ENTROPY_EXTRA)
- /* MemUse entropy global state initialized. */
- static int entropy_memuse_initialized = 0;
- /* Global SHA-3 object used for conditioning entropy and creating noise. */
- static wc_Sha3 entropyHash;
- /* Reset the health tests. */
- static void Entropy_HealthTest_Reset(void);
- #if !defined(ENTROPY_MEMUSE_THREAD) && \
- (defined(__x86_64__) || defined(__i386__))
- /* Get the high resolution time counter.
- *
- * @return 64-bit count of CPU cycles.
- */
- static WC_INLINE word64 Entropy_TimeHiRes(void)
- {
- unsigned int lo_c, hi_c;
- __asm__ __volatile__ (
- "rdtsc"
- : "=a"(lo_c), "=d"(hi_c) /* out */
- : "a"(0) /* in */
- : "%ebx", "%ecx"); /* clobber */
- return ((word64)lo_c) | (((word64)hi_c) << 32);
- }
- #elif !defined(ENTROPY_MEMUSE_THREAD) && \
- (defined(__APPLE__) || defined(__MACH__))
- /* Get the high resolution time counter.
- *
- * @return 64-bit time in nanoseconds.
- */
- static WC_INLINE word64 Entropy_TimeHiRes(void)
- {
- return mach_absolute_time();
- }
- #elif !defined(ENTROPY_MEMUSE_THREAD) && defined(__aarch64__)
- /* Get the high resolution time counter.
- *
- * @return 64-bit timer count.
- */
- static WC_INLINE word64 Entropy_TimeHiRes(void)
- {
- word64 cnt;
- __asm__ __volatile__ (
- "mrs %[cnt], cntvct_el0"
- : [cnt] "=r"(cnt)
- :
- :
- );
- return cnt;
- }
- #elif !defined(ENTROPY_MEMUSE_THREAD) && (_POSIX_C_SOURCE >= 199309L)
- /* Get the high resolution time counter.
- *
- * @return 64-bit time that is the nanoseconds of current time.
- */
- static WC_INLINE word64 Entropy_TimeHiRes(void)
- {
- struct timespec now;
- clock_gettime(CLOCK_REALTIME, &now);
- return now.tv_nsec;
- }
- #elif defined(_WIN32) /* USE_WINDOWS_API */
- /* Get the high resolution time counter.
- *
- * @return 64-bit timer
- */
- static WC_INLINE word64 Entropy_TimeHiRes(void)
- {
- LARGE_INTEGER count;
- QueryPerformanceCounter(&count);
- return (word64)(count.QuadPart);
- }
- #elif defined(WOLFSSL_THREAD_NO_JOIN)
- /* Start and stop thread that counts as a proxy for time counter. */
- #define ENTROPY_MEMUSE_THREADED
- /* Data for entropy thread. */
- typedef struct ENTROPY_THREAD_DATA {
- /* Current counter - proxy for time. */
- word64 counter;
- /* Whether to stop thread. */
- int stop;
- } ENTROPY_THREAD_DATA;
- /* Track whether entropy thread has been started already. */
- static int entropy_thread_started = 0;
- /* Data for thread to update/observer. */
- static volatile ENTROPY_THREAD_DATA entropy_thread_data = { 0, 0 };
- /* Get the high resolution time counter. Counter incremented in thread.
- *
- * @return 64-bit counter.
- */
- static WC_INLINE word64 Entropy_TimeHiRes(void)
- {
- /* Return counter update in thread. */
- return entropy_thread_data.counter;
- }
- /* Thread that increments counter while not told to stop.
- *
- * @param [in,out] args Entropy data including: counter and stop flag.
- * @return NULL always.
- */
- static THREAD_RETURN WOLFSSL_THREAD_NO_JOIN Entropy_IncCounter(void* args)
- {
- (void)args;
- /* Keep going until caller tells us to stop and exit. */
- while (!entropy_thread_data.stop) {
- /* Increment counter acting as high resolution timer. */
- entropy_thread_data.counter++;
- }
- #ifdef WOLFSSL_DEBUG_ENTROPY_MEMUSE
- fprintf(stderr, "EXITING ENTROPY COUNTER THREAD\n");
- #endif
- /* Exit from thread. */
- WOLFSSL_RETURN_FROM_THREAD(0);
- }
- /* Start a thread that increments counter if not one already.
- *
- * Won't start a new thread if one already running.
- * Waits for thread to start by waiting for counter to have incremented.
- *
- * @return 0 on success.
- * @return Negative on failure.
- */
- static int Entropy_StartThread(void)
- {
- int ret = 0;
- /* Only continue if we haven't started a thread. */
- if (!entropy_thread_started) {
- /* Get counter before starting thread. */
- word64 start_counter = entropy_thread_data.counter;
- /* In case of restarting thread, set stop indicator to false. */
- entropy_thread_data.stop = 0;
- #ifdef WOLFSSL_DEBUG_ENTROPY_MEMUSE
- fprintf(stderr, "STARTING ENTROPY COUNTER THREAD\n");
- #endif
- /* Create a thread that increments the counter in the data. */
- /* Thread resources to be disposed of. */
- ret = wolfSSL_NewThreadNoJoin(Entropy_IncCounter, NULL);
- if (ret == 0) {
- /* Wait for the counter to increase indicating thread started. */
- while (entropy_thread_data.counter == start_counter) {
- sched_yield();
- }
- }
- entropy_thread_started = (ret == 0);
- }
- return ret;
- }
- /* Tell thread to stop and wait for it to complete.
- *
- * Called by wolfCrypt_Cleanup().
- */
- static void Entropy_StopThread(void)
- {
- /* Only stop a thread if one is running. */
- if (entropy_thread_started) {
- /* Tell thread to stop. */
- entropy_thread_data.stop = 1;
- /* Stopped thread so no thread started anymore. */
- entropy_thread_started = 0;
- }
- }
- /* end if defined(HAVE_PTHREAD) */
- #else
- #error "No high precision time available for MemUse Entropy."
- #endif
- #ifndef ENTROPY_NUM_WORDS_BITS
- /* Number of bits to count of 64-bit words in state. */
- #define ENTROPY_NUM_WORDS_BITS 14
- #endif
- /* Floor of 8 yields pool of 256x 64-bit word samples
- * 9 -> 512x 64-bit word samples
- * 10 -> 1,024x 64-bit word samples
- * 11 -> 2,048x 64-bit word samples
- * 12 -> 4,096x 64-bit word samples
- * 13 -> 8,192x 64-bit word samples
- * 14 -> 16,384x 64-bit word samples
- * 15 -> 32,768x 64-bit word samples
- * ... doubling every time up to a maximum of:
- * 30 -> 1,073,741,824x 64-bit word samples
- * 1 billion+ samples should be more then sufficient for any use-case
- */
- #if ENTROPY_NUM_WORDS_BITS < 8
- #error "ENTROPY_NUM_WORDS_BITS must be 8 or more"
- #elif ENTROPY_NUM_WORDS_BITS > 30
- #error "ENTROPY_NUM_WORDS_BITS must be less than 31"
- #endif
- /* Number of 64-bit words in state. */
- #define ENTROPY_NUM_WORDS (1 << ENTROPY_NUM_WORDS_BITS)
- /* Size of one block of 64-bit words. */
- #define ENTROPY_BLOCK_SZ (ENTROPY_NUM_WORDS_BITS - 8)
- #ifndef ENTROPY_NUM_UPDATES
- /* Number of times to update random blocks.
- * Less than 2^ENTROPY_BLOCK_SZ (default: 2^6 = 64).
- * Maximize value to maximize entropy per sample.
- * Limit value to ensure entropy is collected in a timely manner.
- */
- #define ENTROPY_NUM_UPDATES 18
- /* Upper round of log2(ENTROPY_NUM_UPDATES) */
- #define ENTROPY_NUM_UPDATES_BITS 5
- #elif !defined(ENTROPY_NUM_UPDATES_BITS)
- #define ENTROPY_NUM_UPDATES_BITS ENTROPY_BLOCK_SZ
- #endif
- /* Amount to shift offset to get better coverage of a block */
- #define ENTROPY_OFFSET_SHIFTING \
- (ENTROPY_BLOCK_SZ / ENTROPY_NUM_UPDATES_BITS)
- #ifndef ENTROPY_NUM_64BIT_WORDS
- /* Number of 64-bit words to update - 32. */
- #define ENTROPY_NUM_64BIT_WORDS WC_SHA3_256_DIGEST_SIZE
- #elif ENTROPY_NUM_64BIT_WORDS > WC_SHA3_256_DIGEST_SIZE
- #error "ENTROPY_NUM_64BIT_WORDS must be <= SHA3-256 digest size in bytes"
- #endif
- /* State to update that is multiple cache lines long. */
- static word64 entropy_state[ENTROPY_NUM_WORDS] = {0};
- /* Using memory will take different amount of times depending on the CPU's
- * caches and business.
- */
- static void Entropy_MemUse(void)
- {
- int i;
- static byte d[WC_SHA3_256_DIGEST_SIZE];
- int j;
- for (j = 0; j < ENTROPY_NUM_UPDATES; j++) {
- /* Hash the first 32 64-bit words of state. */
- wc_Sha3_256_Update(&entropyHash, (byte*)entropy_state,
- sizeof(*entropy_state) * ENTROPY_NUM_64BIT_WORDS);
- /* Get pseudo-random indices. */
- wc_Sha3_256_Final(&entropyHash, d);
- for (i = 0; i < ENTROPY_NUM_64BIT_WORDS; i++) {
- /* Choose a 64-bit word from a pseudo-random block.*/
- int idx = ((int)d[i] << ENTROPY_BLOCK_SZ) +
- (j << ENTROPY_OFFSET_SHIFTING);
- /* Update a pseudo-random 64-bit word with a pseudo-random value. */
- entropy_state[idx] += Entropy_TimeHiRes();
- /* Ensure part of state that is hashed is updated. */
- entropy_state[i] += entropy_state[idx];
- }
- }
- }
- /* Last time entropy sample was gathered. */
- static word64 entropy_last_time = 0;
- /* Get a sample of noise.
- *
- * Value is time taken to use memory.
- *
- * Called to test raw entropy.
- *
- * @return 64-bit value that is the noise.
- */
- static word64 Entropy_GetSample(void)
- {
- word64 now;
- word64 ret;
- /* Use memory such that it will take an unpredictable amount of time. */
- Entropy_MemUse();
- /* Get the time now to subtract from previous end time. */
- now = Entropy_TimeHiRes();
- /* Calculate time diff since last sampling. */
- ret = now - entropy_last_time;
- /* Store last time. */
- entropy_last_time = now;
- return ret;
- }
- /* Get as many samples of noise as required.
- *
- * One sample is one byte.
- *
- * @param [out] noise Buffer to hold samples.
- * @param [in] samples Number of one byte samples to get.
- */
- static void Entropy_GetNoise(unsigned char* noise, int samples)
- {
- int i;
- /* Do it once to get things going. */
- Entropy_MemUse();
- /* Get as many samples as required. */
- for (i = 0; i < samples; i++) {
- noise[i] = (byte)Entropy_GetSample();
- }
- }
- /* Generate raw entropy for performing assessment.
- *
- * @param [out] raw Buffer to hold raw entropy data.
- * @param [in] cnt Number of bytes of raw entropy to get.
- * @return 0 on success.
- * @return Negative when creating a thread fails - when no high resolution
- * clock available.
- */
- int wc_Entropy_GetRawEntropy(unsigned char* raw, int cnt)
- {
- int ret = 0;
- #ifdef ENTROPY_MEMUSE_THREADED
- /* Start the counter thread as a proxy for time counter. */
- ret = Entropy_StartThread();
- if (ret == 0)
- #endif
- {
- Entropy_GetNoise(raw, cnt);
- }
- #ifdef ENTROPY_MEMUSE_THREADED
- /* Stop the counter thread to avoid thrashing the system. */
- Entropy_StopThread();
- #endif
- return ret;
- }
- #if ENTROPY_MIN == 1
- /* SP800-90b 4.4.1 - Repetition Test
- * C = 1 + upper(-log2(alpha) / H)
- * When alpha = 2^-30 and H = 1,
- * C = 1 + upper(30 / 1) = 31
- */
- #define REP_CUTOFF 31
- #else
- #error "Minimum entropy not defined to a recognized value."
- #endif
- /* Have valid previous sample for repetition test. */
- static int rep_have_prev = 0;
- /* Previous sample value. */
- static byte rep_prev_noise;
- static void Entropy_HealthTest_Repetition_Reset(void)
- {
- /* No previous stored. */
- rep_have_prev = 0;
- /* Clear previous. */
- rep_prev_noise = 0;
- }
- /* Test sample value with repetition test.
- *
- * @param [in] noise Sample to test.
- * @return 0 on success.
- * @return ENTROPY_RT_E on failure.
- */
- static int Entropy_HealthTest_Repetition(byte noise)
- {
- int ret = 0;
- /* Number of times previous value has been seen continuously. */
- static int rep_cnt = 0;
- /* If we don't have a previous then store this one for next time. */
- if (!rep_have_prev) {
- rep_prev_noise = noise;
- rep_have_prev = 1;
- }
- /* Check whether this sample matches last. */
- else if (noise == rep_prev_noise) {
- /* Update count of repetitions. */
- rep_cnt++;
- /* Fail if we reach cutoff. */
- if (rep_cnt >= REP_CUTOFF) {
- #ifdef WOLFSSL_DEBUG_ENTROPY_MEMUSE
- fprintf(stderr, "REPETITION FAILED: %d\n", noise);
- #endif
- Entropy_HealthTest_Repetition_Reset();
- ret = ENTROPY_RT_E;
- }
- }
- else {
- /* Cache new previous and seen one so far. */
- rep_prev_noise = noise;
- rep_cnt = 1;
- }
- return ret;
- }
- /* SP800-90b 4.4.2 - Adaptive Proportion Test
- * Para 2
- * ... The window size W is selected based on the alphabet size ... 512 if
- * the noise source is not binary ...
- */
- #define PROP_WINDOW_SIZE 512
- #if ENTROPY_MIN == 1
- /* SP800-90b 4.4.2 - Adaptive Proportion Test
- * Note 10
- * C = 1 + CRITBINOM(W, power(2,( -H)),1-alpha)
- * alpa = 2^-30 = POWER(2,-30), H = 1, W = 512
- * C = 1 + CRITBINOM(512, 0.5, 1-POWER(2,-30)) = 1 + 324 = 325
- */
- #define PROP_CUTOFF 325
- #else
- #error "Minimum entropy not defined to a recognized value."
- #endif
- /* Total number of samples storef for Adaptive proportion test.
- * Need the next 512 samples to compare this this one.
- */
- static word16 prop_total = 0;
- /* Index of first sample. */
- static word16 prop_first = 0;
- /* Index to put next sample in. */
- static word16 prop_last = 0;
- /* Count of each value seen in queue. */
- static word16 prop_cnt[1 << ENTROPY_BITS_USED] = { 0 };
- /* Circular queue of samples. */
- static word16 prop_samples[PROP_WINDOW_SIZE];
- /* Resets the data for the Adaptive Proportion Test.
- */
- static void Entropy_HealthTest_Proportion_Reset(void)
- {
- /* Clear out samples. */
- XMEMSET(prop_samples, 0, sizeof(prop_samples));
- /* Clear out counts. */
- XMEMSET(prop_cnt, 0, sizeof(prop_cnt));
- /* Clear stored count. */
- prop_total = 0;
- /* Reset first and last index for samples. */
- prop_first = 0;
- prop_last = 0;
- }
- /* Add sample to Adaptive Proportion test.
- *
- * SP800-90b 4.4.2 - Adaptive Proportion Test
- *
- * Sample is accumulated into buffer until required successive values seen.
- *
- * @param [in] noise Sample to test.
- * @return 0 on success.
- * @return ENTROPY_APT_E on failure.
- */
- static int Entropy_HealthTest_Proportion(byte noise)
- {
- int ret = 0;
- /* Need at least 512-1 samples to test with. */
- if (prop_total < PROP_WINDOW_SIZE - 1) {
- /* Store sample at last position in circular queue. */
- prop_samples[prop_last++] = noise;
- /* Update count of seen value based on new sample. */
- prop_cnt[noise]++;
- /* Update count of store values. */
- prop_total++;
- }
- else {
- /* Get first value in queue - value to test. */
- byte val = (byte)prop_samples[prop_first];
- /* Store new sample in queue. */
- prop_samples[prop_last] = noise;
- /* Update first index now that we have removed in from the queue. */
- prop_first = (prop_first + 1) % PROP_WINDOW_SIZE;
- /* Update last index now that we have added new sample to queue. */
- prop_last = (prop_last + 1) % PROP_WINDOW_SIZE;
- /* Removed sample from queue - remove count. */
- prop_cnt[val]--;
- /* Added sample to queue - add count. */
- prop_cnt[noise]++;
- /* Check whether removed value has too many repetitions in queue. */
- if (prop_cnt[val] >= PROP_CUTOFF) {
- #ifdef WOLFSSL_DEBUG_ENTROPY_MEMUSE
- fprintf(stderr, "PROPORTION FAILED: %d %d\n", val, prop_cnt[val]);
- #endif
- Entropy_HealthTest_Proportion_Reset();
- /* Error code returned. */
- ret = ENTROPY_APT_E;
- }
- }
- return ret;
- }
- /* SP800-90b 4.3 - Requirements for Health Tests
- * 1.4: The entropy source's startup tests shall run the continuous health
- * tests over at least 1024 consecutive samples.
- *
- * Adaptive Proportion Test requires a number of samples to compared too.
- */
- #define ENTROPY_INITIAL_COUNT (1024 + PROP_WINDOW_SIZE)
- /* Perform startup health testing.
- *
- * Fill adaptive proportion test buffer and then do 1024 samples.
- * Perform repetition test on all samples expect last.
- *
- * Discards samples from health tests on failure.
- *
- * @return 0 on success.
- * @return ENTROPY_RT_E or ENTROPY_APT_E on failure.
- */
- static int Entropy_HealthTest_Startup(void)
- {
- int ret = 0;
- byte initial[ENTROPY_INITIAL_COUNT];
- int i;
- #ifdef WOLFSSL_DEBUG_ENTROPY_MEMUSE
- fprintf(stderr, "STARTUP HEALTH TEST\n");
- #endif
- /* Fill initial sample buffer with noise. */
- Entropy_GetNoise(initial, ENTROPY_INITIAL_COUNT);
- /* Health check initial noise. */
- for (i = 0; (ret == 0) && (i < ENTROPY_INITIAL_COUNT); i++) {
- ret = Entropy_HealthTest_Repetition(initial[i]);
- if (ret == 0) {
- ret = Entropy_HealthTest_Proportion(initial[i]);
- }
- }
- if (ret != 0) {
- /* Failing test only resets its own data. */
- Entropy_HealthTest_Reset();
- }
- return ret;
- }
- /* Condition raw entropy noise using SHA-3-256.
- *
- * Put noise into a hash function: SHA-3-256.
- * Add the current time counter to help with uniqueness.
- *
- * @param [out] output Buffer to conditioned data.
- * @param [in] len Number of bytes to put into output buffer.
- * @param [in] noise Buffer with raw noise data.
- * @param [in] noise_len Length of noise data in bytes.
- * @return 0 on success.
- * @return Negative on failure.
- */
- static int Entropy_Condition(byte* output, word32 len, byte* noise,
- word32 noise_len)
- {
- int ret;
- /* Add noise to initialized hash. */
- ret = wc_Sha3_256_Update(&entropyHash, noise, noise_len);
- if (ret == 0) {
- word64 now = Entropy_TimeHiRes();
- /* Add time now counter. */
- ret = wc_Sha3_256_Update(&entropyHash, (byte*)&now, sizeof(now));
- }
- if (ret == 0) {
- /* Finalize into output buffer. */
- if (len == WC_SHA3_256_DIGEST_SIZE) {
- ret = wc_Sha3_256_Final(&entropyHash, output);
- }
- else {
- byte hash[WC_SHA3_256_DIGEST_SIZE];
- ret = wc_Sha3_256_Final(&entropyHash, hash);
- if (ret == 0) {
- XMEMCPY(output, hash, len);
- }
- }
- }
- return ret;
- }
- /* Mutex to prevent multiple callers requesting entropy operations at the
- * same time.
- */
- static wolfSSL_Mutex entropy_mutex;
- /* Get entropy of specified strength.
- *
- * SP800-90b 2.3.1 - GetEntropy: An Interface to the Entropy Source
- *
- * In threaded environment, only one thread at a time can get entropy.
- *
- * @param [in] bits Number of entropy bits. 256 is max value.
- * @param [out] entropy Buffer to hold entropy.
- * @param [in] len Length of data to put into buffer in bytes.
- * @return 0 on success.
- * @return ENTROPY_RT_E or ENTROPY_APT_E on failure.
- * @return BAD_MUTEX_E when unable to lock mutex.
- */
- int wc_Entropy_Get(int bits, unsigned char* entropy, word32 len)
- {
- int ret = 0;
- byte noise[MAX_NOISE_CNT];
- /* Noise length is the number of 8 byte samples required to get the bits of
- * entropy requested. */
- int noise_len = (bits + ENTROPY_EXTRA) / ENTROPY_MIN;
- /* Lock the mutex as collection uses globals. */
- if (wc_LockMutex(&entropy_mutex) != 0) {
- ret = BAD_MUTEX_E;
- }
- #ifdef ENTROPY_MEMUSE_THREADED
- if (ret == 0) {
- /* Start the counter thread as a proxy for time counter. */
- ret = Entropy_StartThread();
- }
- #endif
- /* Check we have had a startup health check pass. */
- if ((ret == 0) && ((prop_total == 0) || (!rep_have_prev))) {
- /* Try again as check failed. */
- ret = Entropy_HealthTest_Startup();
- }
- /* Keep putting data into buffer until full. */
- while ((ret == 0) && (len > 0)) {
- int i;
- word32 entropy_len = WC_SHA3_256_DIGEST_SIZE;
- /* Output 32 bytes at a time unless buffer has fewer bytes remaining. */
- if (len < entropy_len) {
- entropy_len = len;
- }
- /* Get raw entropy noise. */
- Entropy_GetNoise(noise, noise_len);
- /* Health check each noise value. */
- for (i = 0; (ret == 0) && (i < noise_len); i++) {
- ret = Entropy_HealthTest_Repetition(noise[i]);
- if (ret == 0) {
- ret = Entropy_HealthTest_Proportion(noise[i]);
- }
- }
- if (ret == 0) {
- /* Condition noise value down to 32-bytes or less. */
- ret = Entropy_Condition(entropy, entropy_len, noise, noise_len);
- }
- if (ret == 0) {
- /* Update buffer pointer and count of bytes left to generate. */
- entropy += entropy_len;
- len -= entropy_len;
- }
- }
- #ifdef ENTROPY_MEMUSE_THREADED
- /* Stop the counter thread to avoid thrashing the system. */
- Entropy_StopThread();
- #endif
- if (ret != BAD_MUTEX_E) {
- /* Unlock mutex now we are done. */
- wc_UnLockMutex(&entropy_mutex);
- }
- return ret;
- }
- /* Performs on-demand testing.
- *
- * In threaded environment, locks out other threads from getting entropy.
- *
- * @return 0 on success.
- * @return ENTROPY_RT_E or ENTROPY_APT_E on failure.
- * @return BAD_MUTEX_E when unable to lock mutex.
- */
- int wc_Entropy_OnDemandTest()
- {
- int ret = 0;
- /* Lock the mutex as we don't want collecting to happen during testing. */
- if (wc_LockMutex(&entropy_mutex) != 0) {
- ret = BAD_MUTEX_E;
- }
- if (ret == 0) {
- /* Reset health test state for startup test. */
- Entropy_HealthTest_Reset();
- /* Perform startup tests. */
- ret = Entropy_HealthTest_Startup();
- }
- if (ret != BAD_MUTEX_E) {
- /* Unlock mutex now we are done. */
- wc_UnLockMutex(&entropy_mutex);
- }
- return ret;
- }
- /* Initialize global state for MemUse Entropy and do startup health test.
- *
- * @return 0 on success.
- * @return Negative on failure.
- */
- int Entropy_Init()
- {
- int ret = 0;
- /* Check whether initialization has succeeded before. */
- if (!entropy_memuse_initialized) {
- #ifndef SINGLE_THREADED
- ret = wc_InitMutex(&entropy_mutex);
- #endif
- if (ret == 0) {
- /* Initialize a SHA3-256 object for use in entropy operations. */
- ret = wc_InitSha3_256(&entropyHash, NULL, INVALID_DEVID);
- }
- /* Set globals initialized. */
- entropy_memuse_initialized = (ret == 0);
- if (ret == 0) {
- #ifdef ENTROPY_MEMUSE_THREADED
- /* Start the counter thread as a proxy for time counter. */
- ret = Entropy_StartThread();
- if (ret == 0)
- #endif
- {
- /* Do first startup test now. */
- ret = Entropy_HealthTest_Startup();
- }
- #ifdef ENTROPY_MEMUSE_THREADED
- /* Stop the counter thread to avoid thrashing the system. */
- Entropy_StopThread();
- #endif
- }
- }
- return ret;
- }
- /* Finalize the data associated with the MemUse Entropy source.
- */
- void Entropy_Final()
- {
- /* Only finalize when initialized. */
- if (entropy_memuse_initialized) {
- /* Dispose of the SHA3-356 hash object. */
- wc_Sha3_256_Free(&entropyHash);
- #ifndef SINGLE_THREADED
- wc_FreeMutex(&entropy_mutex);
- #endif
- /* Clear health test data. */
- Entropy_HealthTest_Reset();
- /* No longer initialized. */
- entropy_memuse_initialized = 0;
- }
- }
- /* Reset the data associated with the MemUse Entropy health tests.
- */
- static void Entropy_HealthTest_Reset(void)
- {
- Entropy_HealthTest_Repetition_Reset();
- Entropy_HealthTest_Proportion_Reset();
- }
- #endif /* HAVE_ENTROPY_MEMUSE */
- static int _InitRng(WC_RNG* rng, byte* nonce, word32 nonceSz,
- void* heap, int devId)
- {
- int ret = 0;
- #ifdef HAVE_HASHDRBG
- word32 seedSz = SEED_SZ + SEED_BLOCK_SZ;
- #endif
- (void)nonce;
- (void)nonceSz;
- if (rng == NULL)
- return BAD_FUNC_ARG;
- if (nonce == NULL && nonceSz != 0)
- return BAD_FUNC_ARG;
- #ifdef WOLFSSL_HEAP_TEST
- rng->heap = (void*)WOLFSSL_HEAP_TEST;
- (void)heap;
- #else
- rng->heap = heap;
- #endif
- #if defined(WOLFSSL_ASYNC_CRYPT) || defined(WOLF_CRYPTO_CB)
- rng->devId = devId;
- #if defined(WOLF_CRYPTO_CB)
- rng->seed.devId = devId;
- #endif
- #else
- (void)devId;
- #endif
- #ifdef HAVE_HASHDRBG
- /* init the DBRG to known values */
- rng->drbg = NULL;
- rng->status = DRBG_NOT_INIT;
- #endif
- #if defined(HAVE_INTEL_RDSEED) || defined(HAVE_INTEL_RDRAND) || \
- defined(HAVE_AMD_RDSEED)
- /* init the intel RD seed and/or rand */
- wc_InitRng_IntelRD();
- #endif
- /* configure async RNG source if available */
- #ifdef WOLFSSL_ASYNC_CRYPT
- ret = wolfAsync_DevCtxInit(&rng->asyncDev, WOLFSSL_ASYNC_MARKER_RNG,
- rng->heap, rng->devId);
- if (ret != 0) {
- #ifdef HAVE_HASHDRBG
- rng->status = DRBG_OK;
- #endif
- return ret;
- }
- #endif
- #ifdef HAVE_INTEL_RDRAND
- /* if CPU supports RDRAND, use it directly and by-pass DRBG init */
- if (IS_INTEL_RDRAND(intel_flags)) {
- #ifdef HAVE_HASHDRBG
- rng->status = DRBG_OK;
- #endif
- return 0;
- }
- #endif
- #ifdef WOLFSSL_XILINX_CRYPT_VERSAL
- ret = wc_VersalTrngInit(nonce, nonceSz);
- if (ret) {
- #ifdef HAVE_HASHDRBG
- rng->status = DRBG_OK;
- #endif
- return ret;
- }
- #endif
- #ifdef CUSTOM_RAND_GENERATE_BLOCK
- ret = 0; /* success */
- #else
- #ifdef HAVE_HASHDRBG
- if (nonceSz == 0)
- seedSz = MAX_SEED_SZ;
- if (wc_RNG_HealthTestLocal(0) == 0) {
- #ifndef WOLFSSL_SMALL_STACK
- byte seed[MAX_SEED_SZ];
- #else
- byte* seed = (byte*)XMALLOC(MAX_SEED_SZ, rng->heap,
- DYNAMIC_TYPE_SEED);
- if (seed == NULL)
- return MEMORY_E;
- #endif
- #if !defined(WOLFSSL_NO_MALLOC) || defined(WOLFSSL_STATIC_MEMORY)
- rng->drbg =
- (struct DRBG*)XMALLOC(sizeof(DRBG_internal), rng->heap,
- DYNAMIC_TYPE_RNG);
- if (rng->drbg == NULL) {
- ret = MEMORY_E;
- rng->status = DRBG_FAILED;
- }
- #else
- rng->drbg = (struct DRBG*)&rng->drbg_data;
- #endif
- if (ret == 0) {
- #ifdef WC_RNG_SEED_CB
- if (seedCb == NULL) {
- ret = DRBG_NO_SEED_CB;
- }
- else {
- ret = seedCb(&rng->seed, seed, seedSz);
- if (ret != 0) {
- ret = DRBG_FAILURE;
- }
- }
- #else
- ret = wc_GenerateSeed(&rng->seed, seed, seedSz);
- #endif
- if (ret == 0)
- ret = wc_RNG_TestSeed(seed, seedSz);
- else {
- ret = DRBG_FAILURE;
- rng->status = DRBG_FAILED;
- }
- if (ret == DRBG_SUCCESS)
- ret = Hash_DRBG_Instantiate((DRBG_internal *)rng->drbg,
- seed + SEED_BLOCK_SZ, seedSz - SEED_BLOCK_SZ,
- nonce, nonceSz, rng->heap, devId);
- if (ret != DRBG_SUCCESS) {
- #if !defined(WOLFSSL_NO_MALLOC) || defined(WOLFSSL_STATIC_MEMORY)
- XFREE(rng->drbg, rng->heap, DYNAMIC_TYPE_RNG);
- #endif
- rng->drbg = NULL;
- }
- }
- ForceZero(seed, seedSz);
- #ifdef WOLFSSL_SMALL_STACK
- XFREE(seed, rng->heap, DYNAMIC_TYPE_SEED);
- #endif
- }
- else {
- ret = DRBG_CONT_FAILURE;
- }
- if (ret == DRBG_SUCCESS) {
- #ifdef WOLFSSL_CHECK_MEM_ZERO
- #ifdef HAVE_HASHDRBG
- struct DRBG_internal* drbg = (struct DRBG_internal*)rng->drbg;
- wc_MemZero_Add("DRBG V", &drbg->V, sizeof(drbg->V));
- wc_MemZero_Add("DRBG C", &drbg->C, sizeof(drbg->C));
- #endif
- #endif
- rng->status = DRBG_OK;
- ret = 0;
- }
- else if (ret == DRBG_CONT_FAILURE) {
- rng->status = DRBG_CONT_FAILED;
- ret = DRBG_CONT_FIPS_E;
- }
- else if (ret == DRBG_FAILURE) {
- rng->status = DRBG_FAILED;
- ret = RNG_FAILURE_E;
- }
- else {
- rng->status = DRBG_FAILED;
- }
- #endif /* HAVE_HASHDRBG */
- #endif /* CUSTOM_RAND_GENERATE_BLOCK */
- return ret;
- }
- WOLFSSL_ABI
- WC_RNG* wc_rng_new(byte* nonce, word32 nonceSz, void* heap)
- {
- WC_RNG* rng;
- rng = (WC_RNG*)XMALLOC(sizeof(WC_RNG), heap, DYNAMIC_TYPE_RNG);
- if (rng) {
- int error = _InitRng(rng, nonce, nonceSz, heap, INVALID_DEVID) != 0;
- if (error) {
- XFREE(rng, heap, DYNAMIC_TYPE_RNG);
- rng = NULL;
- }
- }
- return rng;
- }
- WOLFSSL_ABI
- void wc_rng_free(WC_RNG* rng)
- {
- if (rng) {
- void* heap = rng->heap;
- wc_FreeRng(rng);
- ForceZero(rng, sizeof(WC_RNG));
- XFREE(rng, heap, DYNAMIC_TYPE_RNG);
- (void)heap;
- }
- }
- WOLFSSL_ABI
- int wc_InitRng(WC_RNG* rng)
- {
- return _InitRng(rng, NULL, 0, NULL, INVALID_DEVID);
- }
- int wc_InitRng_ex(WC_RNG* rng, void* heap, int devId)
- {
- return _InitRng(rng, NULL, 0, heap, devId);
- }
- int wc_InitRngNonce(WC_RNG* rng, byte* nonce, word32 nonceSz)
- {
- return _InitRng(rng, nonce, nonceSz, NULL, INVALID_DEVID);
- }
- int wc_InitRngNonce_ex(WC_RNG* rng, byte* nonce, word32 nonceSz,
- void* heap, int devId)
- {
- return _InitRng(rng, nonce, nonceSz, heap, devId);
- }
- /* place a generated block in output */
- WOLFSSL_ABI
- int wc_RNG_GenerateBlock(WC_RNG* rng, byte* output, word32 sz)
- {
- int ret;
- if (rng == NULL || output == NULL)
- return BAD_FUNC_ARG;
- if (sz == 0)
- return 0;
- #ifdef WOLF_CRYPTO_CB
- #ifndef WOLF_CRYPTO_CB_FIND
- if (rng->devId != INVALID_DEVID)
- #endif
- {
- ret = wc_CryptoCb_RandomBlock(rng, output, sz);
- if (ret != CRYPTOCB_UNAVAILABLE)
- return ret;
- /* fall-through when unavailable */
- }
- #endif
- #ifdef HAVE_INTEL_RDRAND
- if (IS_INTEL_RDRAND(intel_flags))
- return wc_GenerateRand_IntelRD(NULL, output, sz);
- #endif
- #if defined(WOLFSSL_SILABS_SE_ACCEL) && defined(WOLFSSL_SILABS_TRNG)
- return silabs_GenerateRand(output, sz);
- #endif
- #if defined(WOLFSSL_ASYNC_CRYPT)
- if (rng->asyncDev.marker == WOLFSSL_ASYNC_MARKER_RNG) {
- /* these are blocking */
- #ifdef HAVE_CAVIUM
- return NitroxRngGenerateBlock(rng, output, sz);
- #elif defined(HAVE_INTEL_QA) && defined(QAT_ENABLE_RNG)
- return IntelQaDrbg(&rng->asyncDev, output, sz);
- #else
- /* simulator not supported */
- #endif
- }
- #endif
- #ifdef CUSTOM_RAND_GENERATE_BLOCK
- XMEMSET(output, 0, sz);
- ret = (int)CUSTOM_RAND_GENERATE_BLOCK(output, sz);
- #else
- #ifdef HAVE_HASHDRBG
- if (sz > RNG_MAX_BLOCK_LEN)
- return BAD_FUNC_ARG;
- if (rng->status != DRBG_OK)
- return RNG_FAILURE_E;
- ret = Hash_DRBG_Generate((DRBG_internal *)rng->drbg, output, sz);
- if (ret == DRBG_NEED_RESEED) {
- if (wc_RNG_HealthTestLocal(1) == 0) {
- #ifndef WOLFSSL_SMALL_STACK
- byte newSeed[SEED_SZ + SEED_BLOCK_SZ];
- ret = DRBG_SUCCESS;
- #else
- byte* newSeed = (byte*)XMALLOC(SEED_SZ + SEED_BLOCK_SZ, rng->heap,
- DYNAMIC_TYPE_SEED);
- ret = (newSeed == NULL) ? MEMORY_E : DRBG_SUCCESS;
- #endif
- if (ret == DRBG_SUCCESS) {
- #ifdef WC_RNG_SEED_CB
- if (seedCb == NULL) {
- ret = DRBG_NO_SEED_CB;
- }
- else {
- ret = seedCb(&rng->seed, newSeed, SEED_SZ + SEED_BLOCK_SZ);
- if (ret != 0) {
- ret = DRBG_FAILURE;
- }
- }
- #else
- ret = wc_GenerateSeed(&rng->seed, newSeed,
- SEED_SZ + SEED_BLOCK_SZ);
- #endif
- if (ret != 0)
- ret = DRBG_FAILURE;
- }
- if (ret == DRBG_SUCCESS)
- ret = wc_RNG_TestSeed(newSeed, SEED_SZ + SEED_BLOCK_SZ);
- if (ret == DRBG_SUCCESS)
- ret = Hash_DRBG_Reseed((DRBG_internal *)rng->drbg,
- newSeed + SEED_BLOCK_SZ, SEED_SZ);
- if (ret == DRBG_SUCCESS)
- ret = Hash_DRBG_Generate((DRBG_internal *)rng->drbg, output, sz);
- ForceZero(newSeed, sizeof(newSeed));
- #ifdef WOLFSSL_SMALL_STACK
- XFREE(newSeed, rng->heap, DYNAMIC_TYPE_SEED);
- #endif
- }
- else {
- ret = DRBG_CONT_FAILURE;
- }
- }
- if (ret == DRBG_SUCCESS) {
- ret = 0;
- }
- else if (ret == DRBG_CONT_FAILURE) {
- ret = DRBG_CONT_FIPS_E;
- rng->status = DRBG_CONT_FAILED;
- }
- else {
- ret = RNG_FAILURE_E;
- rng->status = DRBG_FAILED;
- }
- #else
- /* if we get here then there is an RNG configuration error */
- ret = RNG_FAILURE_E;
- #endif /* HAVE_HASHDRBG */
- #endif /* CUSTOM_RAND_GENERATE_BLOCK */
- return ret;
- }
- int wc_RNG_GenerateByte(WC_RNG* rng, byte* b)
- {
- return wc_RNG_GenerateBlock(rng, b, 1);
- }
- int wc_FreeRng(WC_RNG* rng)
- {
- int ret = 0;
- if (rng == NULL)
- return BAD_FUNC_ARG;
- #if defined(WOLFSSL_ASYNC_CRYPT)
- wolfAsync_DevCtxFree(&rng->asyncDev, WOLFSSL_ASYNC_MARKER_RNG);
- #endif
- #ifdef HAVE_HASHDRBG
- if (rng->drbg != NULL) {
- if (Hash_DRBG_Uninstantiate((DRBG_internal *)rng->drbg) != DRBG_SUCCESS)
- ret = RNG_FAILURE_E;
- #if !defined(WOLFSSL_NO_MALLOC) || defined(WOLFSSL_STATIC_MEMORY)
- XFREE(rng->drbg, rng->heap, DYNAMIC_TYPE_RNG);
- #elif defined(WOLFSSL_CHECK_MEM_ZERO)
- wc_MemZero_Check(rng->drbg, sizeof(DRBG_internal));
- #endif
- rng->drbg = NULL;
- }
- rng->status = DRBG_NOT_INIT;
- #endif /* HAVE_HASHDRBG */
- #ifdef WOLFSSL_XILINX_CRYPT_VERSAL
- /* don't overwrite previously set error */
- if (wc_VersalTrngReset() && !ret)
- ret = WC_HW_E;
- #endif
- return ret;
- }
- #ifdef HAVE_HASHDRBG
- int wc_RNG_HealthTest(int reseed, const byte* seedA, word32 seedASz,
- const byte* seedB, word32 seedBSz,
- byte* output, word32 outputSz)
- {
- return wc_RNG_HealthTest_ex(reseed, NULL, 0,
- seedA, seedASz, seedB, seedBSz,
- output, outputSz,
- NULL, INVALID_DEVID);
- }
- int wc_RNG_HealthTest_ex(int reseed, const byte* nonce, word32 nonceSz,
- const byte* seedA, word32 seedASz,
- const byte* seedB, word32 seedBSz,
- byte* output, word32 outputSz,
- void* heap, int devId)
- {
- int ret = -1;
- DRBG_internal* drbg;
- #ifndef WOLFSSL_SMALL_STACK
- DRBG_internal drbg_var;
- #endif
- if (seedA == NULL || output == NULL) {
- return BAD_FUNC_ARG;
- }
- if (reseed != 0 && seedB == NULL) {
- return BAD_FUNC_ARG;
- }
- if (outputSz != RNG_HEALTH_TEST_CHECK_SIZE) {
- return ret;
- }
- #ifdef WOLFSSL_SMALL_STACK
- drbg = (DRBG_internal*)XMALLOC(sizeof(DRBG_internal), heap,
- DYNAMIC_TYPE_RNG);
- if (drbg == NULL) {
- return MEMORY_E;
- }
- #else
- drbg = &drbg_var;
- #endif
- if (Hash_DRBG_Instantiate(drbg, seedA, seedASz, nonce, nonceSz,
- heap, devId) != 0) {
- goto exit_rng_ht;
- }
- if (reseed) {
- if (Hash_DRBG_Reseed(drbg, seedB, seedBSz) != 0) {
- goto exit_rng_ht;
- }
- }
- /* This call to generate is prescribed by the NIST DRBGVS
- * procedure. The results are thrown away. The known
- * answer test checks the second block of DRBG out of
- * the generator to ensure the internal state is updated
- * as expected. */
- if (Hash_DRBG_Generate(drbg, output, outputSz) != 0) {
- goto exit_rng_ht;
- }
- if (Hash_DRBG_Generate(drbg, output, outputSz) != 0) {
- goto exit_rng_ht;
- }
- /* Mark success */
- ret = 0;
- exit_rng_ht:
- /* This is safe to call even if Hash_DRBG_Instantiate fails */
- if (Hash_DRBG_Uninstantiate(drbg) != 0) {
- ret = -1;
- }
- #ifdef WOLFSSL_SMALL_STACK
- XFREE(drbg, heap, DYNAMIC_TYPE_RNG);
- #endif
- return ret;
- }
- const FLASH_QUALIFIER byte seedA_data[] = {
- 0x63, 0x36, 0x33, 0x77, 0xe4, 0x1e, 0x86, 0x46, 0x8d, 0xeb, 0x0a, 0xb4,
- 0xa8, 0xed, 0x68, 0x3f, 0x6a, 0x13, 0x4e, 0x47, 0xe0, 0x14, 0xc7, 0x00,
- 0x45, 0x4e, 0x81, 0xe9, 0x53, 0x58, 0xa5, 0x69, 0x80, 0x8a, 0xa3, 0x8f,
- 0x2a, 0x72, 0xa6, 0x23, 0x59, 0x91, 0x5a, 0x9f, 0x8a, 0x04, 0xca, 0x68
- };
- const FLASH_QUALIFIER byte reseedSeedA_data[] = {
- 0xe6, 0x2b, 0x8a, 0x8e, 0xe8, 0xf1, 0x41, 0xb6, 0x98, 0x05, 0x66, 0xe3,
- 0xbf, 0xe3, 0xc0, 0x49, 0x03, 0xda, 0xd4, 0xac, 0x2c, 0xdf, 0x9f, 0x22,
- 0x80, 0x01, 0x0a, 0x67, 0x39, 0xbc, 0x83, 0xd3
- };
- const FLASH_QUALIFIER byte outputA_data[] = {
- 0x04, 0xee, 0xc6, 0x3b, 0xb2, 0x31, 0xdf, 0x2c, 0x63, 0x0a, 0x1a, 0xfb,
- 0xe7, 0x24, 0x94, 0x9d, 0x00, 0x5a, 0x58, 0x78, 0x51, 0xe1, 0xaa, 0x79,
- 0x5e, 0x47, 0x73, 0x47, 0xc8, 0xb0, 0x56, 0x62, 0x1c, 0x18, 0xbd, 0xdc,
- 0xdd, 0x8d, 0x99, 0xfc, 0x5f, 0xc2, 0xb9, 0x20, 0x53, 0xd8, 0xcf, 0xac,
- 0xfb, 0x0b, 0xb8, 0x83, 0x12, 0x05, 0xfa, 0xd1, 0xdd, 0xd6, 0xc0, 0x71,
- 0x31, 0x8a, 0x60, 0x18, 0xf0, 0x3b, 0x73, 0xf5, 0xed, 0xe4, 0xd4, 0xd0,
- 0x71, 0xf9, 0xde, 0x03, 0xfd, 0x7a, 0xea, 0x10, 0x5d, 0x92, 0x99, 0xb8,
- 0xaf, 0x99, 0xaa, 0x07, 0x5b, 0xdb, 0x4d, 0xb9, 0xaa, 0x28, 0xc1, 0x8d,
- 0x17, 0x4b, 0x56, 0xee, 0x2a, 0x01, 0x4d, 0x09, 0x88, 0x96, 0xff, 0x22,
- 0x82, 0xc9, 0x55, 0xa8, 0x19, 0x69, 0xe0, 0x69, 0xfa, 0x8c, 0xe0, 0x07,
- 0xa1, 0x80, 0x18, 0x3a, 0x07, 0xdf, 0xae, 0x17
- };
- const FLASH_QUALIFIER byte seedB_data[] = {
- 0xa6, 0x5a, 0xd0, 0xf3, 0x45, 0xdb, 0x4e, 0x0e, 0xff, 0xe8, 0x75, 0xc3,
- 0xa2, 0xe7, 0x1f, 0x42, 0xc7, 0x12, 0x9d, 0x62, 0x0f, 0xf5, 0xc1, 0x19,
- 0xa9, 0xef, 0x55, 0xf0, 0x51, 0x85, 0xe0, 0xfb, /* nonce next */
- 0x85, 0x81, 0xf9, 0x31, 0x75, 0x17, 0x27, 0x6e, 0x06, 0xe9, 0x60, 0x7d,
- 0xdb, 0xcb, 0xcc, 0x2e
- };
- const FLASH_QUALIFIER byte outputB_data[] = {
- 0xd3, 0xe1, 0x60, 0xc3, 0x5b, 0x99, 0xf3, 0x40, 0xb2, 0x62, 0x82, 0x64,
- 0xd1, 0x75, 0x10, 0x60, 0xe0, 0x04, 0x5d, 0xa3, 0x83, 0xff, 0x57, 0xa5,
- 0x7d, 0x73, 0xa6, 0x73, 0xd2, 0xb8, 0xd8, 0x0d, 0xaa, 0xf6, 0xa6, 0xc3,
- 0x5a, 0x91, 0xbb, 0x45, 0x79, 0xd7, 0x3f, 0xd0, 0xc8, 0xfe, 0xd1, 0x11,
- 0xb0, 0x39, 0x13, 0x06, 0x82, 0x8a, 0xdf, 0xed, 0x52, 0x8f, 0x01, 0x81,
- 0x21, 0xb3, 0xfe, 0xbd, 0xc3, 0x43, 0xe7, 0x97, 0xb8, 0x7d, 0xbb, 0x63,
- 0xdb, 0x13, 0x33, 0xde, 0xd9, 0xd1, 0xec, 0xe1, 0x77, 0xcf, 0xa6, 0xb7,
- 0x1f, 0xe8, 0xab, 0x1d, 0xa4, 0x66, 0x24, 0xed, 0x64, 0x15, 0xe5, 0x1c,
- 0xcd, 0xe2, 0xc7, 0xca, 0x86, 0xe2, 0x83, 0x99, 0x0e, 0xea, 0xeb, 0x91,
- 0x12, 0x04, 0x15, 0x52, 0x8b, 0x22, 0x95, 0x91, 0x02, 0x81, 0xb0, 0x2d,
- 0xd4, 0x31, 0xf4, 0xc9, 0xf7, 0x04, 0x27, 0xdf
- };
- static int wc_RNG_HealthTestLocal(int reseed)
- {
- int ret = 0;
- #ifdef WOLFSSL_SMALL_STACK
- byte* check;
- #else
- byte check[RNG_HEALTH_TEST_CHECK_SIZE];
- #endif
- #ifdef WOLFSSL_SMALL_STACK
- check = (byte*)XMALLOC(RNG_HEALTH_TEST_CHECK_SIZE, NULL,
- DYNAMIC_TYPE_TMP_BUFFER);
- if (check == NULL) {
- return MEMORY_E;
- }
- #endif
- if (reseed) {
- #ifdef WOLFSSL_USE_FLASHMEM
- byte* seedA = (byte*)XMALLOC(sizeof(seedA_data), NULL,
- DYNAMIC_TYPE_TMP_BUFFER);
- byte* reseedSeedA = (byte*)XMALLOC(sizeof(reseedSeedA_data), NULL,
- DYNAMIC_TYPE_TMP_BUFFER);
- byte* outputA = (byte*)XMALLOC(sizeof(outputA_data), NULL,
- DYNAMIC_TYPE_TMP_BUFFER);
- if (!seedA || !reseedSeedA || !outputA) {
- XFREE(seedA, NULL, DYNAMIC_TYPE_TMP_BUFFER);
- XFREE(reseedSeedA, NULL, DYNAMIC_TYPE_TMP_BUFFER);
- XFREE(outputA, NULL, DYNAMIC_TYPE_TMP_BUFFER);
- ret = MEMORY_E;
- }
- else {
- XMEMCPY_P(seedA, seedA_data, sizeof(seedA_data));
- XMEMCPY_P(reseedSeedA, reseedSeedA_data, sizeof(reseedSeedA_data));
- XMEMCPY_P(outputA, outputA_data, sizeof(outputA_data));
- #else
- const byte* seedA = seedA_data;
- const byte* reseedSeedA = reseedSeedA_data;
- const byte* outputA = outputA_data;
- #endif
- ret = wc_RNG_HealthTest(1, seedA, sizeof(seedA_data),
- reseedSeedA, sizeof(reseedSeedA_data),
- check, RNG_HEALTH_TEST_CHECK_SIZE);
- if (ret == 0) {
- if (ConstantCompare(check, outputA,
- RNG_HEALTH_TEST_CHECK_SIZE) != 0)
- ret = -1;
- }
- #ifdef WOLFSSL_USE_FLASHMEM
- XFREE(seedA, NULL, DYNAMIC_TYPE_TMP_BUFFER);
- XFREE(reseedSeedA, NULL, DYNAMIC_TYPE_TMP_BUFFER);
- XFREE(outputA, NULL, DYNAMIC_TYPE_TMP_BUFFER);
- }
- #endif
- }
- else {
- #ifdef WOLFSSL_USE_FLASHMEM
- byte* seedB = (byte*)XMALLOC(sizeof(seedB_data), NULL,
- DYNAMIC_TYPE_TMP_BUFFER);
- byte* outputB = (byte*)XMALLOC(sizeof(outputB_data), NULL,
- DYNAMIC_TYPE_TMP_BUFFER);
- if (!seedB || !outputB) {
- XFREE(seedB, NULL, DYNAMIC_TYPE_TMP_BUFFER);
- XFREE(outputB, NULL, DYNAMIC_TYPE_TMP_BUFFER);
- ret = MEMORY_E;
- }
- else {
- XMEMCPY_P(seedB, seedB_data, sizeof(seedB_data));
- XMEMCPY_P(outputB, outputB_data, sizeof(outputB_data));
- #else
- const byte* seedB = seedB_data;
- const byte* outputB = outputB_data;
- #endif
- ret = wc_RNG_HealthTest(0, seedB, sizeof(seedB_data),
- NULL, 0,
- check, RNG_HEALTH_TEST_CHECK_SIZE);
- if (ret == 0) {
- if (ConstantCompare(check, outputB,
- RNG_HEALTH_TEST_CHECK_SIZE) != 0)
- ret = -1;
- }
- /* The previous test cases use a large seed instead of a seed and nonce.
- * seedB is actually from a test case with a seed and nonce, and
- * just concatenates them. The pivot point between seed and nonce is
- * byte 32, feed them into the health test separately. */
- if (ret == 0) {
- ret = wc_RNG_HealthTest_ex(0,
- seedB + 32, sizeof(seedB_data) - 32,
- seedB, 32,
- NULL, 0,
- check, RNG_HEALTH_TEST_CHECK_SIZE,
- NULL, INVALID_DEVID);
- if (ret == 0) {
- if (ConstantCompare(check, outputB, sizeof(outputB_data)) != 0)
- ret = -1;
- }
- }
- #ifdef WOLFSSL_USE_FLASHMEM
- XFREE(seedB, NULL, DYNAMIC_TYPE_TMP_BUFFER);
- XFREE(outputB, NULL, DYNAMIC_TYPE_TMP_BUFFER);
- }
- #endif
- }
- #ifdef WOLFSSL_SMALL_STACK
- XFREE(check, NULL, DYNAMIC_TYPE_TMP_BUFFER);
- #endif
- return ret;
- }
- #endif /* HAVE_HASHDRBG */
- #ifdef HAVE_WNR
- /*
- * Init global Whitewood netRandom context
- * Returns 0 on success, negative on error
- */
- int wc_InitNetRandom(const char* configFile, wnr_hmac_key hmac_cb, int timeout)
- {
- if (configFile == NULL || timeout < 0)
- return BAD_FUNC_ARG;
- if (wnr_mutex_init > 0) {
- WOLFSSL_MSG("netRandom context already created, skipping");
- return 0;
- }
- if (wc_InitMutex(&wnr_mutex) != 0) {
- WOLFSSL_MSG("Bad Init Mutex wnr_mutex");
- return BAD_MUTEX_E;
- }
- wnr_mutex_init = 1;
- if (wc_LockMutex(&wnr_mutex) != 0) {
- WOLFSSL_MSG("Bad Lock Mutex wnr_mutex");
- return BAD_MUTEX_E;
- }
- /* store entropy timeout */
- wnr_timeout = timeout;
- /* create global wnr_context struct */
- if (wnr_create(&wnr_ctx) != WNR_ERROR_NONE) {
- WOLFSSL_MSG("Error creating global netRandom context");
- return RNG_FAILURE_E;
- }
- /* load config file */
- if (wnr_config_loadf(wnr_ctx, (char*)configFile) != WNR_ERROR_NONE) {
- WOLFSSL_MSG("Error loading config file into netRandom context");
- wnr_destroy(wnr_ctx);
- wnr_ctx = NULL;
- return RNG_FAILURE_E;
- }
- /* create/init polling mechanism */
- if (wnr_poll_create() != WNR_ERROR_NONE) {
- WOLFSSL_MSG("Error initializing netRandom polling mechanism");
- wnr_destroy(wnr_ctx);
- wnr_ctx = NULL;
- return RNG_FAILURE_E;
- }
- /* validate config, set HMAC callback (optional) */
- if (wnr_setup(wnr_ctx, hmac_cb) != WNR_ERROR_NONE) {
- WOLFSSL_MSG("Error setting up netRandom context");
- wnr_destroy(wnr_ctx);
- wnr_ctx = NULL;
- wnr_poll_destroy();
- return RNG_FAILURE_E;
- }
- wc_UnLockMutex(&wnr_mutex);
- return 0;
- }
- /*
- * Free global Whitewood netRandom context
- * Returns 0 on success, negative on error
- */
- int wc_FreeNetRandom(void)
- {
- if (wnr_mutex_init > 0) {
- if (wc_LockMutex(&wnr_mutex) != 0) {
- WOLFSSL_MSG("Bad Lock Mutex wnr_mutex");
- return BAD_MUTEX_E;
- }
- if (wnr_ctx != NULL) {
- wnr_destroy(wnr_ctx);
- wnr_ctx = NULL;
- }
- wnr_poll_destroy();
- wc_UnLockMutex(&wnr_mutex);
- wc_FreeMutex(&wnr_mutex);
- wnr_mutex_init = 0;
- }
- return 0;
- }
- #endif /* HAVE_WNR */
- #if defined(HAVE_INTEL_RDRAND) || defined(HAVE_INTEL_RDSEED) || \
- defined(HAVE_AMD_RDSEED)
- #ifdef WOLFSSL_ASYNC_CRYPT
- /* need more retries if multiple cores */
- #define INTELRD_RETRY (32 * 8)
- #else
- #define INTELRD_RETRY 32
- #endif
- #if defined(HAVE_INTEL_RDSEED) || defined(HAVE_AMD_RDSEED)
- #ifndef USE_INTEL_INTRINSICS
- /* return 0 on success */
- static WC_INLINE int IntelRDseed64(word64* seed)
- {
- unsigned char ok;
- __asm__ volatile("rdseed %0; setc %1":"=r"(*seed), "=qm"(ok));
- return (ok) ? 0 : -1;
- }
- #else /* USE_INTEL_INTRINSICS */
- /* The compiler Visual Studio uses does not allow inline assembly.
- * It does allow for Intel intrinsic functions. */
- /* return 0 on success */
- # ifdef __GNUC__
- __attribute__((target("rdseed")))
- # endif
- static WC_INLINE int IntelRDseed64(word64* seed)
- {
- int ok;
- ok = _rdseed64_step((unsigned long long*) seed);
- return (ok) ? 0 : -1;
- }
- #endif /* USE_INTEL_INTRINSICS */
- /* return 0 on success */
- static WC_INLINE int IntelRDseed64_r(word64* rnd)
- {
- int i;
- for (i = 0; i < INTELRD_RETRY; i++) {
- if (IntelRDseed64(rnd) == 0)
- return 0;
- }
- return -1;
- }
- #ifndef WOLFSSL_LINUXKM
- /* return 0 on success */
- static int wc_GenerateSeed_IntelRD(OS_Seed* os, byte* output, word32 sz)
- {
- int ret;
- word64 rndTmp;
- (void)os;
- if (!IS_INTEL_RDSEED(intel_flags))
- return -1;
- for (; (sz / sizeof(word64)) > 0; sz -= sizeof(word64),
- output += sizeof(word64)) {
- ret = IntelRDseed64_r((word64*)output);
- if (ret != 0)
- return ret;
- }
- if (sz == 0)
- return 0;
- /* handle unaligned remainder */
- ret = IntelRDseed64_r(&rndTmp);
- if (ret != 0)
- return ret;
- XMEMCPY(output, &rndTmp, sz);
- ForceZero(&rndTmp, sizeof(rndTmp));
- return 0;
- }
- #endif
- #endif /* HAVE_INTEL_RDSEED || HAVE_AMD_RDSEED */
- #ifdef HAVE_INTEL_RDRAND
- #ifndef USE_INTEL_INTRINSICS
- /* return 0 on success */
- static WC_INLINE int IntelRDrand64(word64 *rnd)
- {
- unsigned char ok;
- __asm__ volatile("rdrand %0; setc %1":"=r"(*rnd), "=qm"(ok));
- return (ok) ? 0 : -1;
- }
- #else /* USE_INTEL_INTRINSICS */
- /* The compiler Visual Studio uses does not allow inline assembly.
- * It does allow for Intel intrinsic functions. */
- /* return 0 on success */
- # ifdef __GNUC__
- __attribute__((target("rdrnd")))
- # endif
- static WC_INLINE int IntelRDrand64(word64 *rnd)
- {
- int ok;
- ok = _rdrand64_step((unsigned long long*) rnd);
- return (ok) ? 0 : -1;
- }
- #endif /* USE_INTEL_INTRINSICS */
- /* return 0 on success */
- static WC_INLINE int IntelRDrand64_r(word64 *rnd)
- {
- int i;
- for (i = 0; i < INTELRD_RETRY; i++) {
- if (IntelRDrand64(rnd) == 0)
- return 0;
- }
- return -1;
- }
- /* return 0 on success */
- static int wc_GenerateRand_IntelRD(OS_Seed* os, byte* output, word32 sz)
- {
- int ret;
- word64 rndTmp;
- (void)os;
- if (!IS_INTEL_RDRAND(intel_flags))
- return -1;
- for (; (sz / sizeof(word64)) > 0; sz -= sizeof(word64),
- output += sizeof(word64)) {
- ret = IntelRDrand64_r((word64 *)output);
- if (ret != 0)
- return ret;
- }
- if (sz == 0)
- return 0;
- /* handle unaligned remainder */
- ret = IntelRDrand64_r(&rndTmp);
- if (ret != 0)
- return ret;
- XMEMCPY(output, &rndTmp, sz);
- return 0;
- }
- #endif /* HAVE_INTEL_RDRAND */
- #endif /* HAVE_INTEL_RDRAND || HAVE_INTEL_RDSEED || HAVE_AMD_RDSEED */
- /* Begin wc_GenerateSeed Implementations */
- #if defined(CUSTOM_RAND_GENERATE_SEED)
- /* Implement your own random generation function
- * Return 0 to indicate success
- * int rand_gen_seed(byte* output, word32 sz);
- * #define CUSTOM_RAND_GENERATE_SEED rand_gen_seed */
- int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
- {
- (void)os; /* Suppress unused arg warning */
- return CUSTOM_RAND_GENERATE_SEED(output, sz);
- }
- #elif defined(CUSTOM_RAND_GENERATE_SEED_OS)
- /* Implement your own random generation function,
- * which includes OS_Seed.
- * Return 0 to indicate success
- * int rand_gen_seed(OS_Seed* os, byte* output, word32 sz);
- * #define CUSTOM_RAND_GENERATE_SEED_OS rand_gen_seed */
- int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
- {
- return CUSTOM_RAND_GENERATE_SEED_OS(os, output, sz);
- }
- #elif defined(CUSTOM_RAND_GENERATE)
- /* Implement your own random generation function
- * word32 rand_gen(void);
- * #define CUSTOM_RAND_GENERATE rand_gen */
- int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
- {
- word32 i = 0;
- (void)os;
- while (i < sz)
- {
- /* If not aligned or there is odd/remainder */
- if( (i + sizeof(CUSTOM_RAND_TYPE)) > sz ||
- ((wc_ptr_t)&output[i] % sizeof(CUSTOM_RAND_TYPE)) != 0
- ) {
- /* Single byte at a time */
- output[i++] = (byte)CUSTOM_RAND_GENERATE();
- }
- else {
- /* Use native 8, 16, 32 or 64 copy instruction */
- *((CUSTOM_RAND_TYPE*)&output[i]) = CUSTOM_RAND_GENERATE();
- i += sizeof(CUSTOM_RAND_TYPE);
- }
- }
- return 0;
- }
- #elif defined(WOLFSSL_SGX)
- int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
- {
- int ret = !SGX_SUCCESS;
- int i, read_max = 10;
- for (i = 0; i < read_max && ret != SGX_SUCCESS; i++) {
- ret = sgx_read_rand(output, sz);
- }
- (void)os;
- return (ret == SGX_SUCCESS) ? 0 : 1;
- }
- #elif defined(USE_WINDOWS_API)
- int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
- {
- #ifdef WOLF_CRYPTO_CB
- int ret;
- if (os != NULL
- #ifndef WOLF_CRYPTO_CB_FIND
- && os->devId != INVALID_DEVID)
- #endif
- {
- ret = wc_CryptoCb_RandomSeed(os, output, sz);
- if (ret != CRYPTOCB_UNAVAILABLE)
- return ret;
- /* fall-through when unavailable */
- }
- #endif
- #ifdef HAVE_INTEL_RDSEED
- if (IS_INTEL_RDSEED(intel_flags)) {
- if (!wc_GenerateSeed_IntelRD(NULL, output, sz)) {
- /* success, we're done */
- return 0;
- }
- #ifdef FORCE_FAILURE_RDSEED
- /* don't fall back to CryptoAPI */
- return READ_RAN_E;
- #endif
- }
- #endif /* HAVE_INTEL_RDSEED */
- if(!CryptAcquireContext(&os->handle, 0, 0, PROV_RSA_FULL,
- CRYPT_VERIFYCONTEXT))
- return WINCRYPT_E;
- if (!CryptGenRandom(os->handle, sz, output))
- return CRYPTGEN_E;
- CryptReleaseContext(os->handle, 0);
- return 0;
- }
- #elif defined(HAVE_RTP_SYS) || defined(EBSNET)
- #include "rtprand.h" /* rtp_rand () */
- #if (defined(HAVE_RTP_SYS) || (defined(RTPLATFORM) && (RTPLATFORM != 0)))
- #include "rtptime.h" /* rtp_get_system_msec() */
- int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
- {
- word32 i;
- rtp_srand(rtp_get_system_msec());
- for (i = 0; i < sz; i++ ) {
- output[i] = rtp_rand() % 256;
- }
- return 0;
- }
- #else
- int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
- {
- word32 i;
- KS_SEED(ks_get_ticks());
- for (i = 0; i < sz; i++ ) {
- output[i] = KS_RANDOM() % 256;
- }
- return 0;
- }
- #endif /* defined(HAVE_RTP_SYS) || (defined(RTPLATFORM) && (RTPLATFORM != 0)) */
- #elif (defined(WOLFSSL_ATMEL) || defined(WOLFSSL_ATECC_RNG)) && \
- !defined(WOLFSSL_PIC32MZ_RNG)
- /* enable ATECC RNG unless using PIC32MZ one instead */
- #include <wolfssl/wolfcrypt/port/atmel/atmel.h>
- int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
- {
- int ret = 0;
- (void)os;
- if (output == NULL) {
- return BUFFER_E;
- }
- ret = atmel_get_random_number(sz, output);
- return ret;
- }
- #elif defined(MICROCHIP_PIC32)
- #ifdef MICROCHIP_MPLAB_HARMONY
- #ifdef MICROCHIP_MPLAB_HARMONY_3
- #include "system/time/sys_time.h"
- #define PIC32_SEED_COUNT SYS_TIME_CounterGet
- #else
- #define PIC32_SEED_COUNT _CP0_GET_COUNT
- #endif
- #else
- #if !defined(WOLFSSL_MICROCHIP_PIC32MZ)
- #include <peripheral/timer.h>
- #endif
- extern word32 ReadCoreTimer(void);
- #define PIC32_SEED_COUNT ReadCoreTimer
- #endif
- #ifdef WOLFSSL_PIC32MZ_RNG
- #include "xc.h"
- int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
- {
- int i;
- byte rnd[8];
- word32 *rnd32 = (word32 *)rnd;
- word32 size = sz;
- byte* op = output;
- #if ((__PIC32_FEATURE_SET0 == 'E') && (__PIC32_FEATURE_SET1 == 'C'))
- RNGNUMGEN1 = _CP0_GET_COUNT();
- RNGPOLY1 = _CP0_GET_COUNT();
- RNGPOLY2 = _CP0_GET_COUNT();
- RNGNUMGEN2 = _CP0_GET_COUNT();
- #else
- /* All others can be seeded from the TRNG */
- RNGCONbits.TRNGMODE = 1;
- RNGCONbits.TRNGEN = 1;
- while (RNGCNT < 64);
- RNGCONbits.LOAD = 1;
- while (RNGCONbits.LOAD == 1);
- while (RNGCNT < 64);
- RNGPOLY2 = RNGSEED2;
- RNGPOLY1 = RNGSEED1;
- #endif
- RNGCONbits.PLEN = 0x40;
- RNGCONbits.PRNGEN = 1;
- for (i=0; i<5; i++) { /* wait for RNGNUMGEN ready */
- volatile int x, y;
- x = RNGNUMGEN1;
- y = RNGNUMGEN2;
- (void)x;
- (void)y;
- }
- do {
- rnd32[0] = RNGNUMGEN1;
- rnd32[1] = RNGNUMGEN2;
- for(i=0; i<8; i++, op++) {
- *op = rnd[i];
- size --;
- if(size==0)break;
- }
- } while(size);
- return 0;
- }
- #else /* WOLFSSL_PIC32MZ_RNG */
- /* uses the core timer, in nanoseconds to seed srand */
- int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
- {
- int i;
- srand(PIC32_SEED_COUNT() * 25);
- for (i = 0; i < sz; i++ ) {
- output[i] = rand() % 256;
- if ( (i % 8) == 7)
- srand(PIC32_SEED_COUNT() * 25);
- }
- return 0;
- }
- #endif /* WOLFSSL_PIC32MZ_RNG */
- #elif defined(FREESCALE_K70_RNGA) || defined(FREESCALE_RNGA)
- /*
- * wc_Generates a RNG seed using the Random Number Generator Accelerator
- * on the Kinetis K70. Documentation located in Chapter 37 of
- * K70 Sub-Family Reference Manual (see Note 3 in the README for link).
- */
- int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
- {
- word32 i;
- /* turn on RNGA module */
- #if defined(SIM_SCGC3_RNGA_MASK)
- SIM_SCGC3 |= SIM_SCGC3_RNGA_MASK;
- #endif
- #if defined(SIM_SCGC6_RNGA_MASK)
- /* additionally needed for at least K64F */
- SIM_SCGC6 |= SIM_SCGC6_RNGA_MASK;
- #endif
- /* set SLP bit to 0 - "RNGA is not in sleep mode" */
- RNG_CR &= ~RNG_CR_SLP_MASK;
- /* set HA bit to 1 - "security violations masked" */
- RNG_CR |= RNG_CR_HA_MASK;
- /* set GO bit to 1 - "output register loaded with data" */
- RNG_CR |= RNG_CR_GO_MASK;
- for (i = 0; i < sz; i++) {
- /* wait for RNG FIFO to be full */
- while((RNG_SR & RNG_SR_OREG_LVL(0xF)) == 0) {}
- /* get value */
- output[i] = RNG_OR;
- }
- return 0;
- }
- #elif defined(FREESCALE_K53_RNGB) || defined(FREESCALE_RNGB)
- /*
- * wc_Generates a RNG seed using the Random Number Generator (RNGB)
- * on the Kinetis K53. Documentation located in Chapter 33 of
- * K53 Sub-Family Reference Manual (see note in the README for link).
- */
- int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
- {
- int i;
- /* turn on RNGB module */
- SIM_SCGC3 |= SIM_SCGC3_RNGB_MASK;
- /* reset RNGB */
- RNG_CMD |= RNG_CMD_SR_MASK;
- /* FIFO generate interrupt, return all zeros on underflow,
- * set auto reseed */
- RNG_CR |= (RNG_CR_FUFMOD_MASK | RNG_CR_AR_MASK);
- /* gen seed, clear interrupts, clear errors */
- RNG_CMD |= (RNG_CMD_GS_MASK | RNG_CMD_CI_MASK | RNG_CMD_CE_MASK);
- /* wait for seeding to complete */
- while ((RNG_SR & RNG_SR_SDN_MASK) == 0) {}
- for (i = 0; i < sz; i++) {
- /* wait for a word to be available from FIFO */
- while((RNG_SR & RNG_SR_FIFO_LVL_MASK) == 0) {}
- /* get value */
- output[i] = RNG_OUT;
- }
- return 0;
- }
- #elif defined(FREESCALE_KSDK_2_0_TRNG)
- #ifndef TRNG0
- #define TRNG0 TRNG
- #endif
- int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
- {
- status_t status;
- status = TRNG_GetRandomData(TRNG0, output, sz);
- (void)os;
- if (status == kStatus_Success)
- {
- return(0);
- }
- return RAN_BLOCK_E;
- }
- #elif defined(FREESCALE_KSDK_2_0_RNGA)
- int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
- {
- status_t status;
- status = RNGA_GetRandomData(RNG, output, sz);
- (void)os;
- if (status == kStatus_Success)
- {
- return(0);
- }
- return RAN_BLOCK_E;
- }
- #elif defined(FREESCALE_RNGA)
- int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
- {
- status_t status;
- status = RNGA_GetRandomData(RNG, output, sz);
- (void)os;
- if (status == kStatus_Success)
- {
- return(0);
- }
- return RAN_BLOCK_E;
- }
- #elif !defined(WOLFSSL_CAAM) && \
- (defined(FREESCALE_MQX) || defined(FREESCALE_KSDK_MQX) || \
- defined(FREESCALE_KSDK_BM) || defined(FREESCALE_FREE_RTOS))
- /*
- * Fallback to USE_TEST_GENSEED if a FREESCALE platform did not match any
- * of the TRNG/RNGA/RNGB support
- */
- #define USE_TEST_GENSEED
- #elif defined(WOLFSSL_SILABS_SE_ACCEL)
- int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
- {
- (void)os;
- return silabs_GenerateRand(output, sz);
- }
- #elif defined(STM32_RNG)
- /* Generate a RNG seed using the hardware random number generator
- * on the STM32F2/F4/F7/L4. */
- #ifdef WOLFSSL_STM32_CUBEMX
- int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
- {
- int ret;
- RNG_HandleTypeDef hrng;
- word32 i = 0;
- (void)os;
- ret = wolfSSL_CryptHwMutexLock();
- if (ret != 0) {
- return ret;
- }
- /* enable RNG clock source */
- __HAL_RCC_RNG_CLK_ENABLE();
- /* enable RNG peripheral */
- XMEMSET(&hrng, 0, sizeof(hrng));
- hrng.Instance = RNG;
- HAL_RNG_Init(&hrng);
- while (i < sz) {
- /* If not aligned or there is odd/remainder */
- if( (i + sizeof(word32)) > sz ||
- ((wc_ptr_t)&output[i] % sizeof(word32)) != 0
- ) {
- /* Single byte at a time */
- uint32_t tmpRng = 0;
- if (HAL_RNG_GenerateRandomNumber(&hrng, &tmpRng) != HAL_OK) {
- wolfSSL_CryptHwMutexUnLock();
- return RAN_BLOCK_E;
- }
- output[i++] = (byte)tmpRng;
- }
- else {
- /* Use native 32 instruction */
- if (HAL_RNG_GenerateRandomNumber(&hrng, (uint32_t*)&output[i]) != HAL_OK) {
- wolfSSL_CryptHwMutexUnLock();
- return RAN_BLOCK_E;
- }
- i += sizeof(word32);
- }
- }
- HAL_RNG_DeInit(&hrng);
- wolfSSL_CryptHwMutexUnLock();
- return 0;
- }
- #elif defined(WOLFSSL_STM32F427_RNG) || defined(WOLFSSL_STM32_RNG_NOLIB) \
- || defined(STM32_NUTTX_RNG)
- #ifdef STM32_NUTTX_RNG
- #include "hardware/stm32_rng.h"
- /* Set CONFIG_STM32U5_RNG in NuttX to enable the RCC */
- #define WC_RNG_CR *((volatile uint32_t*)(STM32_RNG_CR))
- #define WC_RNG_SR *((volatile uint32_t*)(STM32_RNG_SR))
- #define WC_RNG_DR *((volatile uint32_t*)(STM32_RNG_DR))
- #else
- /* Comes from "stm32xxxx_hal.h" */
- #define WC_RNG_CR RNG->CR
- #define WC_RNG_SR RNG->SR
- #define WC_RNG_DR RNG->DR
- #endif
- /* Generate a RNG seed using the hardware RNG on the STM32F427
- * directly, following steps outlined in STM32F4 Reference
- * Manual (Chapter 24) for STM32F4xx family. */
- int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
- {
- int ret;
- word32 i;
- (void)os;
- ret = wolfSSL_CryptHwMutexLock();
- if (ret != 0) {
- return ret;
- }
- #ifndef STM32_NUTTX_RNG
- /* enable RNG peripheral clock */
- RCC->AHB2ENR |= RCC_AHB2ENR_RNGEN;
- #endif
- /* enable RNG interrupt, set IE bit in RNG->CR register */
- WC_RNG_CR |= RNG_CR_IE;
- /* enable RNG, set RNGEN bit in RNG->CR. Activates RNG,
- * RNG_LFSR, and error detector */
- WC_RNG_CR |= RNG_CR_RNGEN;
- /* verify no errors, make sure SEIS and CEIS bits are 0
- * in RNG->SR register */
- if (WC_RNG_SR & (RNG_SR_SECS | RNG_SR_CECS)) {
- wolfSSL_CryptHwMutexUnLock();
- return RNG_FAILURE_E;
- }
- for (i = 0; i < sz; i++) {
- /* wait until RNG number is ready */
- while ((WC_RNG_SR & RNG_SR_DRDY) == 0) { }
- /* get value */
- output[i] = WC_RNG_DR;
- }
- wolfSSL_CryptHwMutexUnLock();
- return 0;
- }
- #else
- /* Generate a RNG seed using the STM32 Standard Peripheral Library */
- int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
- {
- int ret;
- word32 i;
- (void)os;
- ret = wolfSSL_CryptHwMutexLock();
- if (ret != 0) {
- return ret;
- }
- /* enable RNG clock source */
- RCC_AHB2PeriphClockCmd(RCC_AHB2Periph_RNG, ENABLE);
- /* reset RNG */
- RNG_DeInit();
- /* enable RNG peripheral */
- RNG_Cmd(ENABLE);
- /* verify no errors with RNG_CLK or Seed */
- if (RNG_GetFlagStatus(RNG_FLAG_SECS | RNG_FLAG_CECS) != RESET) {
- wolfSSL_CryptHwMutexUnLock();
- return RNG_FAILURE_E;
- }
- for (i = 0; i < sz; i++) {
- /* wait until RNG number is ready */
- while (RNG_GetFlagStatus(RNG_FLAG_DRDY) == RESET) { }
- /* get value */
- output[i] = RNG_GetRandomNumber();
- }
- wolfSSL_CryptHwMutexUnLock();
- return 0;
- }
- #endif /* WOLFSSL_STM32_CUBEMX */
- #elif defined(WOLFSSL_TIRTOS)
- #warning "potential for not enough entropy, currently being used for testing"
- #include <xdc/runtime/Timestamp.h>
- #include <stdlib.h>
- int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
- {
- int i;
- srand(xdc_runtime_Timestamp_get32());
- for (i = 0; i < sz; i++ ) {
- output[i] = rand() % 256;
- if ((i % 8) == 7) {
- srand(xdc_runtime_Timestamp_get32());
- }
- }
- return 0;
- }
- #elif defined(WOLFSSL_PB)
- int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
- {
- word32 i;
- for (i = 0; i < sz; i++)
- output[i] = UTL_Rand();
- (void)os;
- return 0;
- }
- #elif defined(WOLFSSL_NUCLEUS)
- #include "nucleus.h"
- #include "kernel/plus_common.h"
- #warning "potential for not enough entropy, currently being used for testing"
- int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
- {
- int i;
- srand(NU_Get_Time_Stamp());
- for (i = 0; i < sz; i++ ) {
- output[i] = rand() % 256;
- if ((i % 8) == 7) {
- srand(NU_Get_Time_Stamp());
- }
- }
- return 0;
- }
- #elif defined(WOLFSSL_DEOS) && !defined(CUSTOM_RAND_GENERATE)
- #include "stdlib.h"
- #warning "potential for not enough entropy, currently being used for testing Deos"
- int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
- {
- int i;
- int seed = XTIME(0);
- (void)os;
- for (i = 0; i < sz; i++ ) {
- output[i] = rand_r(&seed) % 256;
- if ((i % 8) == 7) {
- seed = XTIME(0);
- rand_r(&seed);
- }
- }
- return 0;
- }
- #elif defined(WOLFSSL_VXWORKS)
- #ifdef WOLFSSL_VXWORKS_6_x
- #include "stdlib.h"
- #warning "potential for not enough entropy, currently being used for testing"
- int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
- {
- int i;
- unsigned int seed = (unsigned int)XTIME(0);
- (void)os;
- for (i = 0; i < sz; i++ ) {
- output[i] = rand_r(&seed) % 256;
- if ((i % 8) == 7) {
- seed = (unsigned int)XTIME(0);
- rand_r(&seed);
- }
- }
- return 0;
- }
- #else
- #include <randomNumGen.h>
- #include <tickLib.h>
- int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz) {
- STATUS status = ERROR;
- RANDOM_NUM_GEN_STATUS r_status = RANDOM_NUM_GEN_ERROR;
- _Vx_ticks_t seed = 0;
- #ifdef VXWORKS_SIM
- /* cannot generate true entropy with VxWorks simulator */
- #warning "not enough entropy, simulator for testing only"
- int i = 0;
- for (i = 0; i < 1000; i++) {
- randomAddTimeStamp();
- }
- #endif
- /*
- wolfSSL can request 52 Bytes of random bytes. We need to add
- buffer to the entropy pool to ensure we can get more than 32 Bytes.
- Because VxWorks has entropy limits (ENTROPY_MIN and ENTROPY_MAX)
- defined as 256 and 1024 bits, see randomSWNumGenLib.c.
- randStatus() can return the following status:
- RANDOM_NUM_GEN_NO_ENTROPY when entropy is 0
- RANDOM_NUM_GEN_ERROR, entropy is not initialized
- RANDOM_NUM_GEN_NOT_ENOUGH_ENTROPY if entropy < 32 Bytes
- RANDOM_NUM_GEN_ENOUGH_ENTROPY if entropy is between 32 and 128 Bytes
- RANDOM_NUM_GEN_MAX_ENTROPY if entropy is greater than 128 Bytes
- */
- do {
- seed = tickGet();
- status = randAdd(&seed, sizeof(_Vx_ticks_t), 2);
- if (status == OK)
- r_status = randStatus();
- } while (r_status != RANDOM_NUM_GEN_MAX_ENTROPY &&
- r_status != RANDOM_NUM_GEN_ERROR && status == OK);
- if (r_status == RANDOM_NUM_GEN_ERROR)
- return RNG_FAILURE_E;
- status = randBytes (output, sz);
- if (status == ERROR) {
- return RNG_FAILURE_E;
- }
- return 0;
- }
- #endif
- #elif defined(WOLFSSL_NRF51) || defined(WOLFSSL_NRF5x)
- #include "app_error.h"
- #include "nrf_drv_rng.h"
- int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
- {
- int remaining = sz, pos = 0;
- word32 err_code;
- byte available;
- static byte initialized = 0;
- (void)os;
- /* Make sure RNG is running */
- if (!initialized) {
- err_code = nrf_drv_rng_init(NULL);
- if (err_code != NRF_SUCCESS && err_code != NRF_ERROR_INVALID_STATE
- #ifdef NRF_ERROR_MODULE_ALREADY_INITIALIZED
- && err_code != NRF_ERROR_MODULE_ALREADY_INITIALIZED
- #endif
- ) {
- return -1;
- }
- initialized = 1;
- }
- while (remaining > 0) {
- int length;
- available = 0;
- nrf_drv_rng_bytes_available(&available); /* void func */
- length = (remaining < available) ? remaining : available;
- if (length > 0) {
- err_code = nrf_drv_rng_rand(&output[pos], length);
- if (err_code != NRF_SUCCESS) {
- break;
- }
- remaining -= length;
- pos += length;
- }
- }
- return (err_code == NRF_SUCCESS) ? 0 : -1;
- }
- #elif defined(HAVE_WNR)
- int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
- {
- if (os == NULL || output == NULL || wnr_ctx == NULL ||
- wnr_timeout < 0) {
- return BAD_FUNC_ARG;
- }
- if (wnr_mutex_init == 0) {
- WOLFSSL_MSG("netRandom context must be created before use");
- return RNG_FAILURE_E;
- }
- if (wc_LockMutex(&wnr_mutex) != 0) {
- WOLFSSL_MSG("Bad Lock Mutex wnr_mutex");
- return BAD_MUTEX_E;
- }
- if (wnr_get_entropy(wnr_ctx, wnr_timeout, output, sz, sz) !=
- WNR_ERROR_NONE)
- return RNG_FAILURE_E;
- wc_UnLockMutex(&wnr_mutex);
- return 0;
- }
- #elif defined(INTIME_RTOS)
- int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
- {
- uint32_t randval;
- word32 len;
- if (output == NULL) {
- return BUFFER_E;
- }
- #ifdef INTIMEVER
- /* If INTIMEVER exists then it is INTIME RTOS v6 or later */
- #define INTIME_RAND_FUNC arc4random
- len = 4;
- #else
- /* v5 and older */
- #define INTIME_RAND_FUNC rand
- srand(time(0));
- len = 2; /* don't use all 31 returned bits */
- #endif
- while (sz > 0) {
- if (sz < len)
- len = sz;
- randval = INTIME_RAND_FUNC();
- XMEMCPY(output, &randval, len);
- output += len;
- sz -= len;
- }
- (void)os;
- return 0;
- }
- #elif defined(WOLFSSL_WICED)
- int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
- {
- int ret;
- (void)os;
- if (output == NULL || UINT16_MAX < sz) {
- return BUFFER_E;
- }
- if ((ret = wiced_crypto_get_random((void*) output, sz) )
- != WICED_SUCCESS) {
- return ret;
- }
- return ret;
- }
- #elif defined(WOLFSSL_NETBURNER)
- #warning using NetBurner pseudo random GetRandomByte for seed
- int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
- {
- word32 i;
- (void)os;
- if (output == NULL) {
- return BUFFER_E;
- }
- for (i = 0; i < sz; i++) {
- output[i] = GetRandomByte();
- /* check if was a valid random number */
- if (!RandomValid())
- return RNG_FAILURE_E;
- }
- return 0;
- }
- #elif defined(IDIRECT_DEV_RANDOM)
- extern int getRandom( int sz, unsigned char *output );
- int GenerateSeed(OS_Seed* os, byte* output, word32 sz)
- {
- int num_bytes_returned = 0;
- num_bytes_returned = getRandom( (int) sz, (unsigned char *) output );
- return 0;
- }
- #elif defined(WOLFSSL_CAAM)
- #include <wolfssl/wolfcrypt/port/caam/wolfcaam.h>
- int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
- {
- unsigned int args[4] = {0};
- CAAM_BUFFER buf[1];
- int ret = 0;
- int times = 1000, i; /* 1000 is an arbitrary number chosen */
- word32 idx = 0;
- (void)os;
- if (output == NULL) {
- return BUFFER_E;
- }
- /* Check Waiting to make sure entropy is ready */
- for (i = 0; i < times; i++) {
- buf[0].BufferType = DataBuffer | LastBuffer;
- buf[0].TheAddress = (CAAM_ADDRESS)(output + idx);
- buf[0].Length = ((sz - idx) < WC_CAAM_MAX_ENTROPY)?
- sz - idx : WC_CAAM_MAX_ENTROPY;
- args[0] = buf[0].Length;
- ret = wc_caamAddAndWait(buf, 1, args, CAAM_ENTROPY);
- if (ret == 0) {
- idx += buf[0].Length;
- if (idx == sz)
- break;
- }
- /* driver could be waiting for entropy */
- if (ret != RAN_BLOCK_E && ret != 0) {
- return ret;
- }
- #ifndef WOLFSSL_IMXRT1170_CAAM
- usleep(100);
- #endif
- }
- if (i == times && ret != 0) {
- return RNG_FAILURE_E;
- }
- else { /* Success case */
- ret = 0;
- }
- return ret;
- }
- #elif defined(WOLFSSL_APACHE_MYNEWT)
- #include <stdlib.h>
- #include "os/os_time.h"
- int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
- {
- int i;
- srand(os_time_get());
- for (i = 0; i < sz; i++ ) {
- output[i] = rand() % 256;
- if ((i % 8) == 7) {
- srand(os_time_get());
- }
- }
- return 0;
- }
- #elif defined(WOLFSSL_ESPIDF)
- /* Espressif */
- #if defined(WOLFSSL_ESP32) || defined(WOLFSSL_ESPWROOM32SE)
- /* Espressif ESP32 */
- #include <esp_system.h>
- #if defined(CONFIG_IDF_TARGET_ESP32S3)
- #include <esp_random.h>
- #endif
- int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
- {
- word32 rand;
- while (sz > 0) {
- word32 len = sizeof(rand);
- if (sz < len)
- len = sz;
- /* Get one random 32-bit word from hw RNG */
- rand = esp_random( );
- XMEMCPY(output, &rand, len);
- output += len;
- sz -= len;
- }
- return 0;
- }
- #elif defined(WOLFSSL_ESP8266)
- /* Espressif ESP8266 */
- #include <esp_system.h>
- int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
- {
- word32 rand;
- while (sz > 0) {
- word32 len = sizeof(rand);
- if (sz < len)
- len = sz;
- /* Get one random 32-bit word from hw RNG */
- rand = esp_random( );
- XMEMCPY(output, &rand, len);
- output += len;
- sz -= len;
- }
- return 0;
- }
- #endif /* end WOLFSSL_ESP32 */
- #elif defined(WOLFSSL_LINUXKM)
- #include <linux/random.h>
- int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
- {
- (void)os;
- get_random_bytes(output, sz);
- return 0;
- }
- #elif defined(WOLFSSL_RENESAS_TSIP)
- #if defined(WOLFSSL_RENESA_TSIP_IAREWRX)
- #include "r_bsp/mcu/all/r_rx_compiler.h"
- #endif
- #include "r_bsp/platform.h"
- #include "r_tsip_rx_if.h"
- int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
- {
- int ret = 0;
- word32 buffer[4];
- while (sz > 0) {
- word32 len = sizeof(buffer);
- if (sz < len) {
- len = sz;
- }
- /* return 4 words random number*/
- ret = R_TSIP_GenerateRandomNumber((uint32_t*)buffer);
- if(ret == TSIP_SUCCESS) {
- XMEMCPY(output, &buffer, len);
- output += len;
- sz -= len;
- } else
- return ret;
- }
- return ret;
- }
- #elif defined(WOLFSSL_RENESAS_FSPSM) || \
- defined(WOLFSSL_RENESAS_FSPSM_CRYPTONLY)
- #include "r_sce.h"
- int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
- {
- int ret = 0;
- word32 buffer[4];
- while (sz > 0) {
- word32 len = sizeof(buffer);
- if (sz < len) {
- len = sz;
- }
- /* return 4 words random number*/
- ret = R_SCE_RandomNumberGenerate(buffer);
- if(ret == FSP_SUCCESS) {
- XMEMCPY(output, &buffer, len);
- output += len;
- sz -= len;
- } else
- return ret;
- }
- return ret;
- }
- #elif defined(WOLFSSL_SCE) && !defined(WOLFSSL_SCE_NO_TRNG)
- #include "hal_data.h"
- #ifndef WOLFSSL_SCE_TRNG_HANDLE
- #define WOLFSSL_SCE_TRNG_HANDLE g_sce_trng
- #endif
- int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
- {
- word32 ret;
- word32 blocks;
- word32 len = sz;
- ret = WOLFSSL_SCE_TRNG_HANDLE.p_api->open(WOLFSSL_SCE_TRNG_HANDLE.p_ctrl,
- WOLFSSL_SCE_TRNG_HANDLE.p_cfg);
- if (ret != SSP_SUCCESS && ret != SSP_ERR_CRYPTO_ALREADY_OPEN) {
- /* error opening TRNG driver */
- return -1;
- }
- blocks = sz / sizeof(word32);
- if (blocks > 0) {
- ret = WOLFSSL_SCE_TRNG_HANDLE.p_api->read(WOLFSSL_SCE_TRNG_HANDLE.p_ctrl,
- (word32*)output, blocks);
- if (ret != SSP_SUCCESS) {
- return -1;
- }
- }
- len = len - (blocks * sizeof(word32));
- if (len > 0) {
- word32 tmp;
- if (len > sizeof(word32)) {
- return -1;
- }
- ret = WOLFSSL_SCE_TRNG_HANDLE.p_api->read(WOLFSSL_SCE_TRNG_HANDLE.p_ctrl,
- (word32*)&tmp, 1);
- if (ret != SSP_SUCCESS) {
- return -1;
- }
- XMEMCPY(output + (blocks * sizeof(word32)), (byte*)&tmp, len);
- }
- ret = WOLFSSL_SCE_TRNG_HANDLE.p_api->close(WOLFSSL_SCE_TRNG_HANDLE.p_ctrl);
- if (ret != SSP_SUCCESS) {
- /* error opening TRNG driver */
- return -1;
- }
- return 0;
- }
- #elif defined(CUSTOM_RAND_GENERATE_BLOCK)
- /* #define CUSTOM_RAND_GENERATE_BLOCK myRngFunc
- * extern int myRngFunc(byte* output, word32 sz);
- */
- #elif defined(WOLFSSL_SAFERTOS) || defined(WOLFSSL_LEANPSK) || \
- defined(WOLFSSL_IAR_ARM) || defined(WOLFSSL_MDK_ARM) || \
- defined(WOLFSSL_uITRON4) || defined(WOLFSSL_uTKERNEL2) || \
- defined(WOLFSSL_LPC43xx) || defined(NO_STM32_RNG) || \
- defined(MBED) || defined(WOLFSSL_EMBOS) || \
- defined(WOLFSSL_GENSEED_FORTEST) || defined(WOLFSSL_CHIBIOS) || \
- defined(WOLFSSL_CONTIKI) || defined(WOLFSSL_AZSPHERE)
- /* these platforms do not have a default random seed and
- you'll need to implement your own wc_GenerateSeed or define via
- CUSTOM_RAND_GENERATE_BLOCK */
- #define USE_TEST_GENSEED
- #elif defined(WOLFSSL_ZEPHYR)
- #include <zephyr/random/rand32.h>
- #ifndef _POSIX_C_SOURCE
- #include <zephyr/posix/time.h>
- #else
- #include <time.h>
- #endif
- int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
- {
- sys_rand_get(output, sz);
- return 0;
- }
- #elif defined(WOLFSSL_TELIT_M2MB)
- #include "stdlib.h"
- static long get_timestamp(void) {
- long myTime = 0;
- INT32 fd = m2mb_rtc_open("/dev/rtc0", 0);
- if (fd >= 0) {
- M2MB_RTC_TIMEVAL_T timeval;
- m2mb_rtc_ioctl(fd, M2MB_RTC_IOCTL_GET_TIMEVAL, &timeval);
- myTime = timeval.msec;
- m2mb_rtc_close(fd);
- }
- return myTime;
- }
- int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
- {
- int i;
- srand(get_timestamp());
- for (i = 0; i < sz; i++ ) {
- output[i] = rand() % 256;
- if ((i % 8) == 7) {
- srand(get_timestamp());
- }
- }
- return 0;
- }
- #elif defined(WOLFSSL_SE050) && !defined(WOLFSSL_SE050_NO_TRNG)
- #include <wolfssl/wolfcrypt/port/nxp/se050_port.h>
- int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz){
- int ret = 0;
- (void)os;
- if (output == NULL) {
- return BUFFER_E;
- }
- ret = wolfSSL_CryptHwMutexLock();
- if (ret == 0) {
- ret = se050_get_random_number(sz, output);
- wolfSSL_CryptHwMutexUnLock();
- }
- return ret;
- }
- #elif defined(DOLPHIN_EMULATOR)
- int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
- {
- word32 i;
- (void)os;
- srand(time(NULL));
- for (i = 0; i < sz; i++)
- output[i] = (byte)rand();
- return 0;
- }
- #elif defined(WOLFSSL_GETRANDOM)
- /* getrandom() was added to the Linux kernel in version 3.17.
- * Added to glibc in version 2.25. */
- int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
- {
- int ret = 0;
- (void)os;
- while (sz) {
- int len;
- errno = 0;
- len = (int)getrandom(output, sz, 0);
- if (len == -1) {
- if (errno == EINTR) {
- /* interrupted, call getrandom again */
- continue;
- }
- else {
- ret = READ_RAN_E;
- }
- break;
- }
- sz -= len;
- output += len;
- }
- return ret;
- }
- #elif defined(NO_DEV_RANDOM)
- #error "you need to write an os specific wc_GenerateSeed() here"
- /*
- int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
- {
- return 0;
- }
- */
- #else
- /* may block */
- int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
- {
- int ret = 0;
- if (os == NULL) {
- return BAD_FUNC_ARG;
- }
- #ifdef WOLF_CRYPTO_CB
- #ifndef WOLF_CRYPTO_CB_FIND
- if (os->devId != INVALID_DEVID)
- #endif
- {
- ret = wc_CryptoCb_RandomSeed(os, output, sz);
- if (ret != CRYPTOCB_UNAVAILABLE)
- return ret;
- /* fall-through when unavailable */
- ret = 0; /* reset error code */
- }
- #endif
- #ifdef HAVE_ENTROPY_MEMUSE
- ret = wc_Entropy_Get(MAX_ENTROPY_BITS, output, sz);
- if (ret == 0) {
- return 0;
- }
- #ifdef ENTROPY_MEMUSE_FORCE_FAILURE
- /* Don't fallback to /dev/urandom. */
- return ret;
- #endif
- #endif
- #if defined(HAVE_INTEL_RDSEED) || defined(HAVE_AMD_RDSEED)
- if (IS_INTEL_RDSEED(intel_flags)) {
- ret = wc_GenerateSeed_IntelRD(NULL, output, sz);
- if (ret == 0) {
- /* success, we're done */
- return ret;
- }
- #ifdef FORCE_FAILURE_RDSEED
- /* don't fallback to /dev/urandom */
- return ret;
- #else
- /* reset error and fallback to using /dev/urandom */
- ret = 0;
- #endif
- }
- #endif /* HAVE_INTEL_RDSEED || HAVE_AMD_RDSEED */
- #ifndef NO_DEV_URANDOM /* way to disable use of /dev/urandom */
- os->fd = open("/dev/urandom", O_RDONLY);
- if (os->fd == -1)
- #endif
- {
- /* may still have /dev/random */
- os->fd = open("/dev/random", O_RDONLY);
- if (os->fd == -1)
- return OPEN_RAN_E;
- }
- while (sz) {
- int len = (int)read(os->fd, output, sz);
- if (len == -1) {
- ret = READ_RAN_E;
- break;
- }
- sz -= (word32)len;
- output += len;
- if (sz) {
- #if defined(BLOCKING) || defined(WC_RNG_BLOCKING)
- sleep(0); /* context switch */
- #else
- ret = RAN_BLOCK_E;
- break;
- #endif
- }
- }
- close(os->fd);
- return ret;
- }
- #endif
- #ifdef USE_TEST_GENSEED
- #ifndef _MSC_VER
- #warning "write a real random seed!!!!, just for testing now"
- #else
- #pragma message("Warning: write a real random seed!!!!, just for testing now")
- #endif
- int wc_GenerateSeed(OS_Seed* os, byte* output, word32 sz)
- {
- word32 i;
- for (i = 0; i < sz; i++ )
- output[i] = i;
- (void)os;
- return 0;
- }
- #endif
- /* End wc_GenerateSeed */
- #if defined(CUSTOM_RAND_GENERATE_BLOCK) && defined(WOLFSSL_KCAPI)
- #include <fcntl.h>
- int wc_hwrng_generate_block(byte *output, word32 sz)
- {
- int fd;
- int ret = 0;
- fd = open("/dev/hwrng", O_RDONLY);
- if (fd == -1)
- return OPEN_RAN_E;
- while(sz)
- {
- int len = (int)read(fd, output, sz);
- if (len == -1)
- {
- ret = READ_RAN_E;
- break;
- }
- sz -= len;
- output += len;
- }
- close(fd);
- return ret;
- }
- #endif
- #endif /* WC_NO_RNG */
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