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- /*
- * Copyright 1999-2022 The OpenSSL Project Authors. All Rights Reserved.
- *
- * Licensed under the Apache License 2.0 (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 <stdlib.h>
- #include "internal/cryptlib.h"
- #include <openssl/x509.h>
- #include <openssl/evp.h>
- #include <openssl/kdf.h>
- #include <openssl/hmac.h>
- #include <openssl/trace.h>
- #include <openssl/core_names.h>
- #include "crypto/evp.h"
- #include "evp_local.h"
- int ossl_pkcs5_pbkdf2_hmac_ex(const char *pass, int passlen,
- const unsigned char *salt, int saltlen, int iter,
- const EVP_MD *digest, int keylen, unsigned char *out,
- OSSL_LIB_CTX *libctx, const char *propq)
- {
- const char *empty = "";
- int rv = 1, mode = 1;
- EVP_KDF *kdf;
- EVP_KDF_CTX *kctx;
- const char *mdname = EVP_MD_get0_name(digest);
- OSSL_PARAM params[6], *p = params;
- /* Keep documented behaviour. */
- if (pass == NULL) {
- pass = empty;
- passlen = 0;
- } else if (passlen == -1) {
- passlen = strlen(pass);
- }
- if (salt == NULL && saltlen == 0)
- salt = (unsigned char *)empty;
- kdf = EVP_KDF_fetch(libctx, OSSL_KDF_NAME_PBKDF2, propq);
- if (kdf == NULL)
- return 0;
- kctx = EVP_KDF_CTX_new(kdf);
- EVP_KDF_free(kdf);
- if (kctx == NULL)
- return 0;
- *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_PASSWORD,
- (char *)pass, (size_t)passlen);
- *p++ = OSSL_PARAM_construct_int(OSSL_KDF_PARAM_PKCS5, &mode);
- *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SALT,
- (unsigned char *)salt, saltlen);
- *p++ = OSSL_PARAM_construct_int(OSSL_KDF_PARAM_ITER, &iter);
- *p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_DIGEST,
- (char *)mdname, 0);
- *p = OSSL_PARAM_construct_end();
- if (EVP_KDF_derive(kctx, out, keylen, params) != 1)
- rv = 0;
- EVP_KDF_CTX_free(kctx);
- OSSL_TRACE_BEGIN(PKCS5V2) {
- BIO_printf(trc_out, "Password:\n");
- BIO_hex_string(trc_out,
- 0, passlen, pass, passlen);
- BIO_printf(trc_out, "\n");
- BIO_printf(trc_out, "Salt:\n");
- BIO_hex_string(trc_out,
- 0, saltlen, salt, saltlen);
- BIO_printf(trc_out, "\n");
- BIO_printf(trc_out, "Iteration count %d\n", iter);
- BIO_printf(trc_out, "Key:\n");
- BIO_hex_string(trc_out,
- 0, keylen, out, keylen);
- BIO_printf(trc_out, "\n");
- } OSSL_TRACE_END(PKCS5V2);
- return rv;
- }
- int PKCS5_PBKDF2_HMAC(const char *pass, int passlen, const unsigned char *salt,
- int saltlen, int iter, const EVP_MD *digest, int keylen,
- unsigned char *out)
- {
- return ossl_pkcs5_pbkdf2_hmac_ex(pass, passlen, salt, saltlen, iter, digest,
- keylen, out, NULL, NULL);
- }
- int PKCS5_PBKDF2_HMAC_SHA1(const char *pass, int passlen,
- const unsigned char *salt, int saltlen, int iter,
- int keylen, unsigned char *out)
- {
- EVP_MD *digest;
- int r = 0;
- if ((digest = EVP_MD_fetch(NULL, SN_sha1, NULL)) != NULL)
- r = ossl_pkcs5_pbkdf2_hmac_ex(pass, passlen, salt, saltlen, iter,
- digest, keylen, out, NULL, NULL);
- EVP_MD_free(digest);
- return r;
- }
- /*
- * Now the key derivation function itself. This is a bit evil because it has
- * to check the ASN1 parameters are valid: and there are quite a few of
- * them...
- */
- int PKCS5_v2_PBE_keyivgen_ex(EVP_CIPHER_CTX *ctx, const char *pass, int passlen,
- ASN1_TYPE *param, const EVP_CIPHER *c,
- const EVP_MD *md, int en_de,
- OSSL_LIB_CTX *libctx, const char *propq)
- {
- PBE2PARAM *pbe2 = NULL;
- char ciph_name[80];
- const EVP_CIPHER *cipher = NULL;
- EVP_CIPHER *cipher_fetch = NULL;
- EVP_PBE_KEYGEN_EX *kdf;
- int rv = 0;
- pbe2 = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(PBE2PARAM), param);
- if (pbe2 == NULL) {
- ERR_raise(ERR_LIB_EVP, EVP_R_DECODE_ERROR);
- goto err;
- }
- /* See if we recognise the key derivation function */
- if (!EVP_PBE_find_ex(EVP_PBE_TYPE_KDF, OBJ_obj2nid(pbe2->keyfunc->algorithm),
- NULL, NULL, NULL, &kdf)) {
- ERR_raise(ERR_LIB_EVP, EVP_R_UNSUPPORTED_KEY_DERIVATION_FUNCTION);
- goto err;
- }
- /*
- * lets see if we recognise the encryption algorithm.
- */
- if (OBJ_obj2txt(ciph_name, sizeof(ciph_name), pbe2->encryption->algorithm, 0) <= 0) {
- ERR_raise(ERR_LIB_EVP, EVP_R_UNSUPPORTED_CIPHER);
- goto err;
- }
- (void)ERR_set_mark();
- cipher = cipher_fetch = EVP_CIPHER_fetch(libctx, ciph_name, propq);
- /* Fallback to legacy method */
- if (cipher == NULL)
- cipher = EVP_get_cipherbyname(ciph_name);
- if (cipher == NULL) {
- (void)ERR_clear_last_mark();
- ERR_raise(ERR_LIB_EVP, EVP_R_UNSUPPORTED_CIPHER);
- goto err;
- }
- (void)ERR_pop_to_mark();
- /* Fixup cipher based on AlgorithmIdentifier */
- if (!EVP_CipherInit_ex(ctx, cipher, NULL, NULL, NULL, en_de))
- goto err;
- if (EVP_CIPHER_asn1_to_param(ctx, pbe2->encryption->parameter) < 0) {
- ERR_raise(ERR_LIB_EVP, EVP_R_CIPHER_PARAMETER_ERROR);
- goto err;
- }
- rv = kdf(ctx, pass, passlen, pbe2->keyfunc->parameter, NULL, NULL, en_de, libctx, propq);
- err:
- EVP_CIPHER_free(cipher_fetch);
- PBE2PARAM_free(pbe2);
- return rv;
- }
- int PKCS5_v2_PBE_keyivgen(EVP_CIPHER_CTX *ctx, const char *pass, int passlen,
- ASN1_TYPE *param, const EVP_CIPHER *c,
- const EVP_MD *md, int en_de)
- {
- return PKCS5_v2_PBE_keyivgen_ex(ctx, pass, passlen, param, c, md, en_de, NULL, NULL);
- }
- int PKCS5_v2_PBKDF2_keyivgen_ex(EVP_CIPHER_CTX *ctx, const char *pass,
- int passlen, ASN1_TYPE *param,
- const EVP_CIPHER *c, const EVP_MD *md, int en_de,
- OSSL_LIB_CTX *libctx, const char *propq)
- {
- unsigned char *salt, key[EVP_MAX_KEY_LENGTH];
- int saltlen, iter, t;
- int rv = 0;
- unsigned int keylen = 0;
- int prf_nid, hmac_md_nid;
- PBKDF2PARAM *kdf = NULL;
- const EVP_MD *prfmd = NULL;
- EVP_MD *prfmd_fetch = NULL;
- if (EVP_CIPHER_CTX_get0_cipher(ctx) == NULL) {
- ERR_raise(ERR_LIB_EVP, EVP_R_NO_CIPHER_SET);
- goto err;
- }
- keylen = EVP_CIPHER_CTX_get_key_length(ctx);
- OPENSSL_assert(keylen <= sizeof(key));
- /* Decode parameter */
- kdf = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(PBKDF2PARAM), param);
- if (kdf == NULL) {
- ERR_raise(ERR_LIB_EVP, EVP_R_DECODE_ERROR);
- goto err;
- }
- t = EVP_CIPHER_CTX_get_key_length(ctx);
- if (t < 0) {
- ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_KEY_LENGTH);
- goto err;
- }
- keylen = t;
- /* Now check the parameters of the kdf */
- if (kdf->keylength && (ASN1_INTEGER_get(kdf->keylength) != (int)keylen)) {
- ERR_raise(ERR_LIB_EVP, EVP_R_UNSUPPORTED_KEYLENGTH);
- goto err;
- }
- if (kdf->prf)
- prf_nid = OBJ_obj2nid(kdf->prf->algorithm);
- else
- prf_nid = NID_hmacWithSHA1;
- if (!EVP_PBE_find(EVP_PBE_TYPE_PRF, prf_nid, NULL, &hmac_md_nid, 0)) {
- ERR_raise(ERR_LIB_EVP, EVP_R_UNSUPPORTED_PRF);
- goto err;
- }
- prfmd = prfmd_fetch = EVP_MD_fetch(libctx, OBJ_nid2sn(hmac_md_nid), propq);
- if (prfmd == NULL)
- prfmd = EVP_get_digestbynid(hmac_md_nid);
- if (prfmd == NULL) {
- ERR_raise(ERR_LIB_EVP, EVP_R_UNSUPPORTED_PRF);
- goto err;
- }
- if (kdf->salt->type != V_ASN1_OCTET_STRING) {
- ERR_raise(ERR_LIB_EVP, EVP_R_UNSUPPORTED_SALT_TYPE);
- goto err;
- }
- /* it seems that its all OK */
- salt = kdf->salt->value.octet_string->data;
- saltlen = kdf->salt->value.octet_string->length;
- iter = ASN1_INTEGER_get(kdf->iter);
- if (!ossl_pkcs5_pbkdf2_hmac_ex(pass, passlen, salt, saltlen, iter, prfmd,
- keylen, key, libctx, propq))
- goto err;
- rv = EVP_CipherInit_ex(ctx, NULL, NULL, key, NULL, en_de);
- err:
- OPENSSL_cleanse(key, keylen);
- PBKDF2PARAM_free(kdf);
- EVP_MD_free(prfmd_fetch);
- return rv;
- }
- int PKCS5_v2_PBKDF2_keyivgen(EVP_CIPHER_CTX *ctx, const char *pass,
- int passlen, ASN1_TYPE *param,
- const EVP_CIPHER *c, const EVP_MD *md, int en_de)
- {
- return PKCS5_v2_PBKDF2_keyivgen_ex(ctx, pass, passlen, param, c, md, en_de,
- NULL, NULL);
- }
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