1 /* $OpenBSD: p5_crpt2.c,v 1.20 2015/02/14 15:49:51 miod Exp $ */
2 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
5 /* ====================================================================
6 * Copyright (c) 1999-2006 The OpenSSL Project. All rights reserved.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in
17 * the documentation and/or other materials provided with the
20 * 3. All advertising materials mentioning features or use of this
21 * software must display the following acknowledgment:
22 * "This product includes software developed by the OpenSSL Project
23 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26 * endorse or promote products derived from this software without
27 * prior written permission. For written permission, please contact
28 * licensing@OpenSSL.org.
30 * 5. Products derived from this software may not be called "OpenSSL"
31 * nor may "OpenSSL" appear in their names without prior written
32 * permission of the OpenSSL Project.
34 * 6. Redistributions of any form whatsoever must retain the following
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50 * OF THE POSSIBILITY OF SUCH DAMAGE.
51 * ====================================================================
53 * This product includes cryptographic software written by Eric Young
54 * (eay@cryptsoft.com). This product includes software written by Tim
55 * Hudson (tjh@cryptsoft.com).
63 #include <openssl/opensslconf.h>
65 #if !defined(OPENSSL_NO_HMAC) && !defined(OPENSSL_NO_SHA)
67 #include <openssl/err.h>
68 #include <openssl/evp.h>
69 #include <openssl/hmac.h>
70 #include <openssl/x509.h>
74 /* This is an implementation of PKCS#5 v2.0 password based encryption key
75 * derivation function PBKDF2.
76 * SHA1 version verified against test vectors posted by Peter Gutmann
77 * <pgut001@cs.auckland.ac.nz> to the PKCS-TNG <pkcs-tng@rsa.com> mailing list.
81 PKCS5_PBKDF2_HMAC(const char *pass, int passlen, const unsigned char *salt,
82 int saltlen, int iter, const EVP_MD *digest, int keylen, unsigned char *out)
84 unsigned char digtmp[EVP_MAX_MD_SIZE], *p, itmp[4];
85 int cplen, j, k, tkeylen, mdlen;
87 HMAC_CTX hctx_tpl, hctx;
89 mdlen = EVP_MD_size(digest);
93 HMAC_CTX_init(&hctx_tpl);
98 else if (passlen == -1)
99 passlen = strlen(pass);
100 if (!HMAC_Init_ex(&hctx_tpl, pass, passlen, digest, NULL)) {
101 HMAC_CTX_cleanup(&hctx_tpl);
109 /* We are unlikely to ever use more than 256 blocks (5120 bits!)
110 * but just in case...
112 itmp[0] = (unsigned char)((i >> 24) & 0xff);
113 itmp[1] = (unsigned char)((i >> 16) & 0xff);
114 itmp[2] = (unsigned char)((i >> 8) & 0xff);
115 itmp[3] = (unsigned char)(i & 0xff);
116 if (!HMAC_CTX_copy(&hctx, &hctx_tpl)) {
117 HMAC_CTX_cleanup(&hctx_tpl);
120 if (!HMAC_Update(&hctx, salt, saltlen) ||
121 !HMAC_Update(&hctx, itmp, 4) ||
122 !HMAC_Final(&hctx, digtmp, NULL)) {
123 HMAC_CTX_cleanup(&hctx_tpl);
124 HMAC_CTX_cleanup(&hctx);
127 HMAC_CTX_cleanup(&hctx);
128 memcpy(p, digtmp, cplen);
129 for (j = 1; j < iter; j++) {
130 if (!HMAC_CTX_copy(&hctx, &hctx_tpl)) {
131 HMAC_CTX_cleanup(&hctx_tpl);
134 if (!HMAC_Update(&hctx, digtmp, mdlen) ||
135 !HMAC_Final(&hctx, digtmp, NULL)) {
136 HMAC_CTX_cleanup(&hctx_tpl);
137 HMAC_CTX_cleanup(&hctx);
140 HMAC_CTX_cleanup(&hctx);
141 for (k = 0; k < cplen; k++)
148 HMAC_CTX_cleanup(&hctx_tpl);
153 PKCS5_PBKDF2_HMAC_SHA1(const char *pass, int passlen, const unsigned char *salt,
154 int saltlen, int iter, int keylen, unsigned char *out)
156 return PKCS5_PBKDF2_HMAC(pass, passlen, salt, saltlen, iter,
157 EVP_sha1(), keylen, out);
160 /* Now the key derivation function itself. This is a bit evil because
161 * it has to check the ASN1 parameters are valid: and there are quite a
166 PKCS5_v2_PBE_keyivgen(EVP_CIPHER_CTX *ctx, const char *pass, int passlen,
167 ASN1_TYPE *param, const EVP_CIPHER *c, const EVP_MD *md, int en_de)
169 const unsigned char *pbuf;
171 PBE2PARAM *pbe2 = NULL;
172 const EVP_CIPHER *cipher;
176 if (param == NULL || param->type != V_ASN1_SEQUENCE ||
177 param->value.sequence == NULL) {
178 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN, EVP_R_DECODE_ERROR);
182 pbuf = param->value.sequence->data;
183 plen = param->value.sequence->length;
184 if (!(pbe2 = d2i_PBE2PARAM(NULL, &pbuf, plen))) {
185 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN, EVP_R_DECODE_ERROR);
189 /* See if we recognise the key derivation function */
191 if (OBJ_obj2nid(pbe2->keyfunc->algorithm) != NID_id_pbkdf2) {
192 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,
193 EVP_R_UNSUPPORTED_KEY_DERIVATION_FUNCTION);
197 /* lets see if we recognise the encryption algorithm.
200 cipher = EVP_get_cipherbyobj(pbe2->encryption->algorithm);
203 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,
204 EVP_R_UNSUPPORTED_CIPHER);
208 /* Fixup cipher based on AlgorithmIdentifier */
209 if (!EVP_CipherInit_ex(ctx, cipher, NULL, NULL, NULL, en_de))
211 if (EVP_CIPHER_asn1_to_param(ctx, pbe2->encryption->parameter) < 0) {
212 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,
213 EVP_R_CIPHER_PARAMETER_ERROR);
216 rv = PKCS5_v2_PBKDF2_keyivgen(ctx, pass, passlen,
217 pbe2->keyfunc->parameter, c, md, en_de);
220 PBE2PARAM_free(pbe2);
225 PKCS5_v2_PBKDF2_keyivgen(EVP_CIPHER_CTX *ctx, const char *pass, int passlen,
226 ASN1_TYPE *param, const EVP_CIPHER *c, const EVP_MD *md, int en_de)
228 unsigned char *salt, key[EVP_MAX_KEY_LENGTH];
229 const unsigned char *pbuf;
230 int saltlen, iter, plen;
232 unsigned int keylen = 0;
233 int prf_nid, hmac_md_nid;
234 PBKDF2PARAM *kdf = NULL;
237 if (EVP_CIPHER_CTX_cipher(ctx) == NULL) {
238 EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_NO_CIPHER_SET);
241 keylen = EVP_CIPHER_CTX_key_length(ctx);
242 if (keylen > sizeof key) {
243 EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_BAD_KEY_LENGTH);
247 /* Decode parameter */
249 if (!param || (param->type != V_ASN1_SEQUENCE)) {
250 EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_DECODE_ERROR);
254 pbuf = param->value.sequence->data;
255 plen = param->value.sequence->length;
257 if (!(kdf = d2i_PBKDF2PARAM(NULL, &pbuf, plen)) ) {
258 EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_DECODE_ERROR);
262 /* Now check the parameters of the kdf */
264 if (kdf->keylength &&
265 (ASN1_INTEGER_get(kdf->keylength) != (int)keylen)){
266 EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN,
267 EVP_R_UNSUPPORTED_KEYLENGTH);
272 prf_nid = OBJ_obj2nid(kdf->prf->algorithm);
274 prf_nid = NID_hmacWithSHA1;
276 if (!EVP_PBE_find(EVP_PBE_TYPE_PRF, prf_nid, NULL, &hmac_md_nid, 0)) {
277 EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_UNSUPPORTED_PRF);
281 prfmd = EVP_get_digestbynid(hmac_md_nid);
283 EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_UNSUPPORTED_PRF);
287 if (kdf->salt->type != V_ASN1_OCTET_STRING) {
288 EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN,
289 EVP_R_UNSUPPORTED_SALT_TYPE);
293 /* it seems that its all OK */
294 salt = kdf->salt->value.octet_string->data;
295 saltlen = kdf->salt->value.octet_string->length;
296 iter = ASN1_INTEGER_get(kdf->iter);
297 if (!PKCS5_PBKDF2_HMAC(pass, passlen, salt, saltlen, iter, prfmd,
300 rv = EVP_CipherInit_ex(ctx, NULL, NULL, key, NULL, en_de);
303 explicit_bzero(key, keylen);
304 PBKDF2PARAM_free(kdf);