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).
61 #if !defined(OPENSSL_NO_HMAC) && !defined(OPENSSL_NO_SHA)
62 #include <openssl/x509.h>
63 #include <openssl/evp.h>
64 #include <openssl/hmac.h>
66 /* set this to print out info about the keygen algorithm */
67 /* #define DEBUG_PKCS5V2 */
70 static void h__dump (const unsigned char *p, int len);
73 /* This is an implementation of PKCS#5 v2.0 password based encryption key
74 * derivation function PBKDF2.
75 * SHA1 version verified against test vectors posted by Peter Gutmann
76 * <pgut001@cs.auckland.ac.nz> to the PKCS-TNG <pkcs-tng@rsa.com> mailing list.
79 int PKCS5_PBKDF2_HMAC(const char *pass, int passlen,
80 const unsigned char *salt, int saltlen, int iter,
82 int keylen, unsigned char *out)
84 unsigned char digtmp[EVP_MAX_MD_SIZE], *p, itmp[4];
85 int cplen, j, k, tkeylen, mdlen;
89 mdlen = EVP_MD_size(digest);
98 else if(passlen == -1)
99 passlen = strlen(pass);
106 /* We are unlikely to ever use more than 256 blocks (5120 bits!)
107 * but just in case...
109 itmp[0] = (unsigned char)((i >> 24) & 0xff);
110 itmp[1] = (unsigned char)((i >> 16) & 0xff);
111 itmp[2] = (unsigned char)((i >> 8) & 0xff);
112 itmp[3] = (unsigned char)(i & 0xff);
113 if (!HMAC_Init_ex(&hctx, pass, passlen, digest, NULL)
114 || !HMAC_Update(&hctx, salt, saltlen)
115 || !HMAC_Update(&hctx, itmp, 4)
116 || !HMAC_Final(&hctx, digtmp, NULL))
118 HMAC_CTX_cleanup(&hctx);
121 memcpy(p, digtmp, cplen);
122 for(j = 1; j < iter; j++)
124 HMAC(digest, pass, passlen,
125 digtmp, mdlen, digtmp, NULL);
126 for(k = 0; k < cplen; k++)
133 HMAC_CTX_cleanup(&hctx);
135 fprintf(stderr, "Password:\n");
136 h__dump (pass, passlen);
137 fprintf(stderr, "Salt:\n");
138 h__dump (salt, saltlen);
139 fprintf(stderr, "Iteration count %d\n", iter);
140 fprintf(stderr, "Key:\n");
141 h__dump (out, keylen);
146 int PKCS5_PBKDF2_HMAC_SHA1(const char *pass, int passlen,
147 const unsigned char *salt, int saltlen, int iter,
148 int keylen, unsigned char *out)
150 return PKCS5_PBKDF2_HMAC(pass, passlen, salt, saltlen, iter, EVP_sha1(),
157 unsigned char out[4];
158 unsigned char salt[] = {0x12, 0x34, 0x56, 0x78};
159 PKCS5_PBKDF2_HMAC_SHA1("password", -1, salt, 4, 5, 4, out);
160 fprintf(stderr, "Out %02X %02X %02X %02X\n",
161 out[0], out[1], out[2], out[3]);
166 /* Now the key derivation function itself. This is a bit evil because
167 * it has to check the ASN1 parameters are valid: and there are quite a
171 int PKCS5_v2_PBE_keyivgen(EVP_CIPHER_CTX *ctx, const char *pass, int passlen,
172 ASN1_TYPE *param, const EVP_CIPHER *c, const EVP_MD *md,
175 unsigned char *salt, key[EVP_MAX_KEY_LENGTH];
176 const unsigned char *pbuf;
177 int saltlen, iter, plen;
179 PBE2PARAM *pbe2 = NULL;
180 const EVP_CIPHER *cipher;
181 PBKDF2PARAM *kdf = NULL;
183 int prf_nid, hmac_md_nid;
185 if (param == NULL || param->type != V_ASN1_SEQUENCE ||
186 param->value.sequence == NULL) {
187 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,EVP_R_DECODE_ERROR);
191 pbuf = param->value.sequence->data;
192 plen = param->value.sequence->length;
193 if(!(pbe2 = d2i_PBE2PARAM(NULL, &pbuf, plen))) {
194 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,EVP_R_DECODE_ERROR);
198 /* See if we recognise the key derivation function */
200 if(OBJ_obj2nid(pbe2->keyfunc->algorithm) != NID_id_pbkdf2) {
201 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,
202 EVP_R_UNSUPPORTED_KEY_DERIVATION_FUNCTION);
206 /* lets see if we recognise the encryption algorithm.
209 cipher = EVP_get_cipherbyobj(pbe2->encryption->algorithm);
212 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,
213 EVP_R_UNSUPPORTED_CIPHER);
217 /* Fixup cipher based on AlgorithmIdentifier */
218 if (!EVP_CipherInit_ex(ctx, cipher, NULL, NULL, NULL, en_de))
220 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN, ERR_R_EVP_LIB);
223 if(EVP_CIPHER_asn1_to_param(ctx, pbe2->encryption->parameter) < 0) {
224 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,
225 EVP_R_CIPHER_PARAMETER_ERROR);
228 keylen = EVP_CIPHER_CTX_key_length(ctx);
229 OPENSSL_assert(keylen <= sizeof key);
231 /* Now decode key derivation function */
233 if(!pbe2->keyfunc->parameter ||
234 (pbe2->keyfunc->parameter->type != V_ASN1_SEQUENCE))
236 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,EVP_R_DECODE_ERROR);
240 pbuf = pbe2->keyfunc->parameter->value.sequence->data;
241 plen = pbe2->keyfunc->parameter->value.sequence->length;
242 if(!(kdf = d2i_PBKDF2PARAM(NULL, &pbuf, plen)) ) {
243 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,EVP_R_DECODE_ERROR);
247 PBE2PARAM_free(pbe2);
250 /* Now check the parameters of the kdf */
252 if(kdf->keylength && (ASN1_INTEGER_get(kdf->keylength) != (int)keylen)){
253 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,
254 EVP_R_UNSUPPORTED_KEYLENGTH);
259 prf_nid = OBJ_obj2nid(kdf->prf->algorithm);
261 prf_nid = NID_hmacWithSHA1;
263 if (!EVP_PBE_find(EVP_PBE_TYPE_PRF, prf_nid, NULL, &hmac_md_nid, 0))
265 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN, EVP_R_UNSUPPORTED_PRF);
269 prfmd = EVP_get_digestbynid(hmac_md_nid);
272 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN, EVP_R_UNSUPPORTED_PRF);
276 if(kdf->salt->type != V_ASN1_OCTET_STRING) {
277 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,
278 EVP_R_UNSUPPORTED_SALT_TYPE);
282 /* it seems that its all OK */
283 salt = kdf->salt->value.octet_string->data;
284 saltlen = kdf->salt->value.octet_string->length;
285 iter = ASN1_INTEGER_get(kdf->iter);
286 if(!PKCS5_PBKDF2_HMAC(pass, passlen, salt, saltlen, iter, prfmd,
289 if (!EVP_CipherInit_ex(ctx, NULL, NULL, key, NULL, en_de))
291 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN, ERR_R_EVP_LIB);
294 OPENSSL_cleanse(key, keylen);
295 PBKDF2PARAM_free(kdf);
299 PBE2PARAM_free(pbe2);
300 PBKDF2PARAM_free(kdf);
305 static void h__dump (const unsigned char *p, int len)
307 for (; len --; p++) fprintf(stderr, "%02X ", *p);
308 fprintf(stderr, "\n");