2 * Copyright 1999-2019 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 "internal/evp_int.h"
21 int PKCS5_PBKDF2_HMAC(const char *pass, int passlen,
22 const unsigned char *salt, int saltlen, int iter,
23 const EVP_MD *digest, int keylen, unsigned char *out)
25 const char *empty = "";
29 /* Keep documented behaviour. */
33 } else if (passlen == -1) {
34 passlen = strlen(pass);
36 if (salt == NULL && saltlen == 0)
37 salt = (unsigned char *)empty;
39 kctx = EVP_KDF_CTX_new_id(EVP_KDF_PBKDF2);
42 if (EVP_KDF_ctrl(kctx, EVP_KDF_CTRL_SET_PASS, pass, (size_t)passlen) != 1
43 || EVP_KDF_ctrl(kctx, EVP_KDF_CTRL_SET_PBKDF2_PKCS5_MODE, 1) != 1
44 || EVP_KDF_ctrl(kctx, EVP_KDF_CTRL_SET_SALT,
45 salt, (size_t)saltlen) != 1
46 || EVP_KDF_ctrl(kctx, EVP_KDF_CTRL_SET_ITER, iter) != 1
47 || EVP_KDF_ctrl(kctx, EVP_KDF_CTRL_SET_MD, digest) != 1
48 || EVP_KDF_derive(kctx, out, keylen) != 1)
51 EVP_KDF_CTX_free(kctx);
53 OSSL_TRACE_BEGIN(PKCS5V2) {
54 BIO_printf(trc_out, "Password:\n");
55 BIO_hex_string(trc_out,
56 0, passlen, pass, passlen);
57 BIO_printf(trc_out, "\n");
58 BIO_printf(trc_out, "Salt:\n");
59 BIO_hex_string(trc_out,
60 0, saltlen, salt, saltlen);
61 BIO_printf(trc_out, "\n");
62 BIO_printf(trc_out, "Iteration count %d\n", iter);
63 BIO_printf(trc_out, "Key:\n");
64 BIO_hex_string(trc_out,
65 0, keylen, out, keylen);
66 BIO_printf(trc_out, "\n");
67 } OSSL_TRACE_END(PKCS5V2);
71 int PKCS5_PBKDF2_HMAC_SHA1(const char *pass, int passlen,
72 const unsigned char *salt, int saltlen, int iter,
73 int keylen, unsigned char *out)
75 return PKCS5_PBKDF2_HMAC(pass, passlen, salt, saltlen, iter, EVP_sha1(),
80 * Now the key derivation function itself. This is a bit evil because it has
81 * to check the ASN1 parameters are valid: and there are quite a few of
85 int PKCS5_v2_PBE_keyivgen(EVP_CIPHER_CTX *ctx, const char *pass, int passlen,
86 ASN1_TYPE *param, const EVP_CIPHER *c,
87 const EVP_MD *md, int en_de)
89 PBE2PARAM *pbe2 = NULL;
90 const EVP_CIPHER *cipher;
95 pbe2 = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(PBE2PARAM), param);
97 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN, EVP_R_DECODE_ERROR);
101 /* See if we recognise the key derivation function */
102 if (!EVP_PBE_find(EVP_PBE_TYPE_KDF, OBJ_obj2nid(pbe2->keyfunc->algorithm),
104 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,
105 EVP_R_UNSUPPORTED_KEY_DERIVATION_FUNCTION);
110 * lets see if we recognise the encryption algorithm.
113 cipher = EVP_get_cipherbyobj(pbe2->encryption->algorithm);
116 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN, EVP_R_UNSUPPORTED_CIPHER);
120 /* Fixup cipher based on AlgorithmIdentifier */
121 if (!EVP_CipherInit_ex(ctx, cipher, NULL, NULL, NULL, en_de))
123 if (EVP_CIPHER_asn1_to_param(ctx, pbe2->encryption->parameter) < 0) {
124 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN, EVP_R_CIPHER_PARAMETER_ERROR);
127 rv = kdf(ctx, pass, passlen, pbe2->keyfunc->parameter, NULL, NULL, en_de);
129 PBE2PARAM_free(pbe2);
133 int PKCS5_v2_PBKDF2_keyivgen(EVP_CIPHER_CTX *ctx, const char *pass,
134 int passlen, ASN1_TYPE *param,
135 const EVP_CIPHER *c, const EVP_MD *md, int en_de)
137 unsigned char *salt, key[EVP_MAX_KEY_LENGTH];
138 int saltlen, iter, t;
140 unsigned int keylen = 0;
141 int prf_nid, hmac_md_nid;
142 PBKDF2PARAM *kdf = NULL;
145 if (EVP_CIPHER_CTX_cipher(ctx) == NULL) {
146 EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_NO_CIPHER_SET);
149 keylen = EVP_CIPHER_CTX_key_length(ctx);
150 OPENSSL_assert(keylen <= sizeof(key));
152 /* Decode parameter */
154 kdf = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(PBKDF2PARAM), param);
157 EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_DECODE_ERROR);
161 t = EVP_CIPHER_CTX_key_length(ctx);
163 EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_INVALID_KEY_LENGTH);
168 /* Now check the parameters of the kdf */
170 if (kdf->keylength && (ASN1_INTEGER_get(kdf->keylength) != (int)keylen)) {
171 EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_UNSUPPORTED_KEYLENGTH);
176 prf_nid = OBJ_obj2nid(kdf->prf->algorithm);
178 prf_nid = NID_hmacWithSHA1;
180 if (!EVP_PBE_find(EVP_PBE_TYPE_PRF, prf_nid, NULL, &hmac_md_nid, 0)) {
181 EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_UNSUPPORTED_PRF);
185 prfmd = EVP_get_digestbynid(hmac_md_nid);
187 EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_UNSUPPORTED_PRF);
191 if (kdf->salt->type != V_ASN1_OCTET_STRING) {
192 EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_UNSUPPORTED_SALT_TYPE);
196 /* it seems that its all OK */
197 salt = kdf->salt->value.octet_string->data;
198 saltlen = kdf->salt->value.octet_string->length;
199 iter = ASN1_INTEGER_get(kdf->iter);
200 if (!PKCS5_PBKDF2_HMAC(pass, passlen, salt, saltlen, iter, prfmd,
203 rv = EVP_CipherInit_ex(ctx, NULL, NULL, key, NULL, en_de);
205 OPENSSL_cleanse(key, keylen);
206 PBKDF2PARAM_free(kdf);