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- /*
- * Copyright 2007-2018 The OpenSSL Project Authors. All Rights Reserved.
- *
- * Licensed under the OpenSSL license (the "License"). You may not use
- * this file except in compliance with the License. You can obtain a copy
- * in the file LICENSE in the source distribution or at
- * https://www.openssl.org/source/license.html
- */
- #include <stdio.h>
- #include "internal/cryptlib.h"
- #include <openssl/x509.h>
- #include <openssl/x509v3.h>
- #include <openssl/evp.h>
- #include <openssl/err.h>
- #include "internal/siphash.h"
- #include "siphash_local.h"
- #include "internal/evp_int.h"
- /* SIPHASH pkey context structure */
- typedef struct siphash_pkey_ctx_st {
- ASN1_OCTET_STRING ktmp; /* Temp storage for key */
- SIPHASH ctx;
- } SIPHASH_PKEY_CTX;
- static int pkey_siphash_init(EVP_PKEY_CTX *ctx)
- {
- SIPHASH_PKEY_CTX *pctx;
- if ((pctx = OPENSSL_zalloc(sizeof(*pctx))) == NULL) {
- CRYPTOerr(CRYPTO_F_PKEY_SIPHASH_INIT, ERR_R_MALLOC_FAILURE);
- return 0;
- }
- pctx->ktmp.type = V_ASN1_OCTET_STRING;
- EVP_PKEY_CTX_set_data(ctx, pctx);
- EVP_PKEY_CTX_set0_keygen_info(ctx, NULL, 0);
- return 1;
- }
- static void pkey_siphash_cleanup(EVP_PKEY_CTX *ctx)
- {
- SIPHASH_PKEY_CTX *pctx = EVP_PKEY_CTX_get_data(ctx);
- if (pctx != NULL) {
- OPENSSL_clear_free(pctx->ktmp.data, pctx->ktmp.length);
- OPENSSL_clear_free(pctx, sizeof(*pctx));
- EVP_PKEY_CTX_set_data(ctx, NULL);
- }
- }
- static int pkey_siphash_copy(EVP_PKEY_CTX *dst, EVP_PKEY_CTX *src)
- {
- SIPHASH_PKEY_CTX *sctx, *dctx;
- /* allocate memory for dst->data and a new SIPHASH_CTX in dst->data->ctx */
- if (!pkey_siphash_init(dst))
- return 0;
- sctx = EVP_PKEY_CTX_get_data(src);
- dctx = EVP_PKEY_CTX_get_data(dst);
- if (ASN1_STRING_get0_data(&sctx->ktmp) != NULL &&
- !ASN1_STRING_copy(&dctx->ktmp, &sctx->ktmp)) {
- /* cleanup and free the SIPHASH_PKEY_CTX in dst->data */
- pkey_siphash_cleanup(dst);
- return 0;
- }
- memcpy(&dctx->ctx, &sctx->ctx, sizeof(SIPHASH));
- return 1;
- }
- static int pkey_siphash_keygen(EVP_PKEY_CTX *ctx, EVP_PKEY *pkey)
- {
- ASN1_OCTET_STRING *key;
- SIPHASH_PKEY_CTX *pctx = EVP_PKEY_CTX_get_data(ctx);
- if (ASN1_STRING_get0_data(&pctx->ktmp) == NULL)
- return 0;
- key = ASN1_OCTET_STRING_dup(&pctx->ktmp);
- if (key == NULL)
- return 0;
- return EVP_PKEY_assign_SIPHASH(pkey, key);
- }
- static int int_update(EVP_MD_CTX *ctx, const void *data, size_t count)
- {
- SIPHASH_PKEY_CTX *pctx = EVP_PKEY_CTX_get_data(EVP_MD_CTX_pkey_ctx(ctx));
- SipHash_Update(&pctx->ctx, data, count);
- return 1;
- }
- static int siphash_signctx_init(EVP_PKEY_CTX *ctx, EVP_MD_CTX *mctx)
- {
- SIPHASH_PKEY_CTX *pctx = EVP_PKEY_CTX_get_data(ctx);
- const unsigned char* key;
- size_t len;
- int hash_size;
- key = EVP_PKEY_get0_siphash(EVP_PKEY_CTX_get0_pkey(ctx), &len);
- if (key == NULL || len != SIPHASH_KEY_SIZE)
- return 0;
- EVP_MD_CTX_set_flags(mctx, EVP_MD_CTX_FLAG_NO_INIT);
- EVP_MD_CTX_set_update_fn(mctx, int_update);
- /* use default rounds (2,4) */
- hash_size = SipHash_hash_size(&pctx->ctx);
- return SipHash_Init(&pctx->ctx, key, hash_size, 0, 0);
- }
- static int siphash_signctx(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
- EVP_MD_CTX *mctx)
- {
- SIPHASH_PKEY_CTX *pctx = ctx->data;
- *siglen = SipHash_hash_size(&pctx->ctx);
- if (sig != NULL)
- return SipHash_Final(&pctx->ctx, sig, *siglen);
- return 1;
- }
- static int pkey_siphash_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
- {
- SIPHASH_PKEY_CTX *pctx = EVP_PKEY_CTX_get_data(ctx);
- const unsigned char *key;
- size_t len;
- int hash_size;
- switch (type) {
- case EVP_PKEY_CTRL_MD:
- /* ignore */
- break;
- case EVP_PKEY_CTRL_SET_DIGEST_SIZE:
- if (p1 != SIPHASH_MIN_DIGEST_SIZE &&
- p1 != SIPHASH_MAX_DIGEST_SIZE) {
- return 0;
- }
- /* use default rounds (2,4) */
- return SipHash_Init(&pctx->ctx, ASN1_STRING_get0_data(&pctx->ktmp), p1, 0, 0);
- case EVP_PKEY_CTRL_SET_MAC_KEY:
- case EVP_PKEY_CTRL_DIGESTINIT:
- if (type == EVP_PKEY_CTRL_SET_MAC_KEY) {
- /* user explicitly setting the key */
- key = p2;
- len = p1;
- } else {
- /* user indirectly setting the key via EVP_DigestSignInit */
- key = EVP_PKEY_get0_siphash(EVP_PKEY_CTX_get0_pkey(ctx), &len);
- }
- if (key == NULL || len != SIPHASH_KEY_SIZE ||
- !ASN1_OCTET_STRING_set(&pctx->ktmp, key, len))
- return 0;
- /* use default rounds (2,4) */
- hash_size = SipHash_hash_size(&pctx->ctx);
- return SipHash_Init(&pctx->ctx, ASN1_STRING_get0_data(&pctx->ktmp), hash_size, 0, 0);
- default:
- return -2;
- }
- return 1;
- }
- static int pkey_siphash_ctrl_str(EVP_PKEY_CTX *ctx,
- const char *type, const char *value)
- {
- if (value == NULL)
- return 0;
- if (strcmp(type, "key") == 0)
- return EVP_PKEY_CTX_str2ctrl(ctx, EVP_PKEY_CTRL_SET_MAC_KEY, value);
- if (strcmp(type, "hexkey") == 0)
- return EVP_PKEY_CTX_hex2ctrl(ctx, EVP_PKEY_CTRL_SET_MAC_KEY, value);
- return -2;
- }
- const EVP_PKEY_METHOD siphash_pkey_meth = {
- EVP_PKEY_SIPHASH,
- EVP_PKEY_FLAG_SIGCTX_CUSTOM, /* we don't deal with a separate MD */
- pkey_siphash_init,
- pkey_siphash_copy,
- pkey_siphash_cleanup,
- 0, 0,
- 0,
- pkey_siphash_keygen,
- 0, 0,
- 0, 0,
- 0, 0,
- siphash_signctx_init,
- siphash_signctx,
- 0, 0,
- 0, 0,
- 0, 0,
- 0, 0,
- pkey_siphash_ctrl,
- pkey_siphash_ctrl_str
- };
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