2 * Copyright 1999-2021 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
12 #include "internal/cryptlib.h"
13 #include <openssl/x509.h>
14 #include <openssl/evp.h>
15 #include <openssl/kdf.h>
16 #include <openssl/hmac.h>
17 #include <openssl/trace.h>
18 #include <openssl/core_names.h>
19 #include "crypto/evp.h"
20 #include "evp_local.h"
22 int pkcs5_pbkdf2_hmac_ex(const char *pass, int passlen,
23 const unsigned char *salt, int saltlen, int iter,
24 const EVP_MD *digest, int keylen, unsigned char *out,
25 OSSL_LIB_CTX *libctx, const char *propq)
27 const char *empty = "";
31 const char *mdname = EVP_MD_name(digest);
32 OSSL_PARAM params[6], *p = params;
34 /* Keep documented behaviour. */
38 } else if (passlen == -1) {
39 passlen = strlen(pass);
41 if (salt == NULL && saltlen == 0)
42 salt = (unsigned char *)empty;
44 kdf = EVP_KDF_fetch(libctx, OSSL_KDF_NAME_PBKDF2, propq);
45 kctx = EVP_KDF_CTX_new(kdf);
49 *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_PASSWORD,
50 (char *)pass, (size_t)passlen);
51 *p++ = OSSL_PARAM_construct_int(OSSL_KDF_PARAM_PKCS5, &mode);
52 *p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SALT,
53 (unsigned char *)salt, saltlen);
54 *p++ = OSSL_PARAM_construct_int(OSSL_KDF_PARAM_ITER, &iter);
55 *p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_DIGEST,
57 *p = OSSL_PARAM_construct_end();
58 if (EVP_KDF_derive(kctx, out, keylen, params) != 1)
61 EVP_KDF_CTX_free(kctx);
63 OSSL_TRACE_BEGIN(PKCS5V2) {
64 BIO_printf(trc_out, "Password:\n");
65 BIO_hex_string(trc_out,
66 0, passlen, pass, passlen);
67 BIO_printf(trc_out, "\n");
68 BIO_printf(trc_out, "Salt:\n");
69 BIO_hex_string(trc_out,
70 0, saltlen, salt, saltlen);
71 BIO_printf(trc_out, "\n");
72 BIO_printf(trc_out, "Iteration count %d\n", iter);
73 BIO_printf(trc_out, "Key:\n");
74 BIO_hex_string(trc_out,
75 0, keylen, out, keylen);
76 BIO_printf(trc_out, "\n");
77 } OSSL_TRACE_END(PKCS5V2);
81 int PKCS5_PBKDF2_HMAC(const char *pass, int passlen, const unsigned char *salt,
82 int saltlen, int iter, const EVP_MD *digest, int keylen,
85 return pkcs5_pbkdf2_hmac_ex(pass, passlen, salt, saltlen, iter, digest,
86 keylen, out, NULL, NULL);
90 int PKCS5_PBKDF2_HMAC_SHA1(const char *pass, int passlen,
91 const unsigned char *salt, int saltlen, int iter,
92 int keylen, unsigned char *out)
94 return PKCS5_PBKDF2_HMAC(pass, passlen, salt, saltlen, iter, EVP_sha1(),
99 * Now the key derivation function itself. This is a bit evil because it has
100 * to check the ASN1 parameters are valid: and there are quite a few of
104 int PKCS5_v2_PBE_keyivgen(EVP_CIPHER_CTX *ctx, const char *pass, int passlen,
105 ASN1_TYPE *param, const EVP_CIPHER *c,
106 const EVP_MD *md, int en_de)
108 PBE2PARAM *pbe2 = NULL;
109 const EVP_CIPHER *cipher;
114 pbe2 = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(PBE2PARAM), param);
116 ERR_raise(ERR_LIB_EVP, EVP_R_DECODE_ERROR);
120 /* See if we recognise the key derivation function */
121 if (!EVP_PBE_find(EVP_PBE_TYPE_KDF, OBJ_obj2nid(pbe2->keyfunc->algorithm),
123 ERR_raise(ERR_LIB_EVP, EVP_R_UNSUPPORTED_KEY_DERIVATION_FUNCTION);
128 * lets see if we recognise the encryption algorithm.
131 cipher = EVP_get_cipherbyobj(pbe2->encryption->algorithm);
134 ERR_raise(ERR_LIB_EVP, EVP_R_UNSUPPORTED_CIPHER);
138 /* Fixup cipher based on AlgorithmIdentifier */
139 if (!EVP_CipherInit_ex(ctx, cipher, NULL, NULL, NULL, en_de))
141 if (EVP_CIPHER_asn1_to_param(ctx, pbe2->encryption->parameter) < 0) {
142 ERR_raise(ERR_LIB_EVP, EVP_R_CIPHER_PARAMETER_ERROR);
145 rv = kdf(ctx, pass, passlen, pbe2->keyfunc->parameter, NULL, NULL, en_de);
147 PBE2PARAM_free(pbe2);
151 int PKCS5_v2_PBKDF2_keyivgen(EVP_CIPHER_CTX *ctx, const char *pass,
152 int passlen, ASN1_TYPE *param,
153 const EVP_CIPHER *c, const EVP_MD *md, int en_de)
155 unsigned char *salt, key[EVP_MAX_KEY_LENGTH];
156 int saltlen, iter, t;
158 unsigned int keylen = 0;
159 int prf_nid, hmac_md_nid;
160 PBKDF2PARAM *kdf = NULL;
163 if (EVP_CIPHER_CTX_cipher(ctx) == NULL) {
164 ERR_raise(ERR_LIB_EVP, EVP_R_NO_CIPHER_SET);
167 keylen = EVP_CIPHER_CTX_key_length(ctx);
168 OPENSSL_assert(keylen <= sizeof(key));
170 /* Decode parameter */
172 kdf = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(PBKDF2PARAM), param);
175 ERR_raise(ERR_LIB_EVP, EVP_R_DECODE_ERROR);
179 t = EVP_CIPHER_CTX_key_length(ctx);
181 ERR_raise(ERR_LIB_EVP, EVP_R_INVALID_KEY_LENGTH);
186 /* Now check the parameters of the kdf */
188 if (kdf->keylength && (ASN1_INTEGER_get(kdf->keylength) != (int)keylen)) {
189 ERR_raise(ERR_LIB_EVP, EVP_R_UNSUPPORTED_KEYLENGTH);
194 prf_nid = OBJ_obj2nid(kdf->prf->algorithm);
196 prf_nid = NID_hmacWithSHA1;
198 if (!EVP_PBE_find(EVP_PBE_TYPE_PRF, prf_nid, NULL, &hmac_md_nid, 0)) {
199 ERR_raise(ERR_LIB_EVP, EVP_R_UNSUPPORTED_PRF);
203 prfmd = EVP_get_digestbynid(hmac_md_nid);
205 ERR_raise(ERR_LIB_EVP, EVP_R_UNSUPPORTED_PRF);
209 if (kdf->salt->type != V_ASN1_OCTET_STRING) {
210 ERR_raise(ERR_LIB_EVP, EVP_R_UNSUPPORTED_SALT_TYPE);
214 /* it seems that its all OK */
215 salt = kdf->salt->value.octet_string->data;
216 saltlen = kdf->salt->value.octet_string->length;
217 iter = ASN1_INTEGER_get(kdf->iter);
218 if (!PKCS5_PBKDF2_HMAC(pass, passlen, salt, saltlen, iter, prfmd,
221 rv = EVP_CipherInit_ex(ctx, NULL, NULL, key, NULL, en_de);
223 OPENSSL_cleanse(key, keylen);
224 PBKDF2PARAM_free(kdf);