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);
96 else if(passlen == -1)
97 passlen = strlen(pass);
104 /* We are unlikely to ever use more than 256 blocks (5120 bits!)
105 * but just in case...
107 itmp[0] = (unsigned char)((i >> 24) & 0xff);
108 itmp[1] = (unsigned char)((i >> 16) & 0xff);
109 itmp[2] = (unsigned char)((i >> 8) & 0xff);
110 itmp[3] = (unsigned char)(i & 0xff);
111 HMAC_Init_ex(&hctx, pass, passlen, digest, NULL);
112 HMAC_Update(&hctx, salt, saltlen);
113 HMAC_Update(&hctx, itmp, 4);
114 HMAC_Final(&hctx, digtmp, NULL);
115 memcpy(p, digtmp, cplen);
116 for(j = 1; j < iter; j++)
118 HMAC(digest, pass, passlen,
119 digtmp, mdlen, digtmp, NULL);
120 for(k = 0; k < cplen; k++)
127 HMAC_CTX_cleanup(&hctx);
129 fprintf(stderr, "Password:\n");
130 h__dump (pass, passlen);
131 fprintf(stderr, "Salt:\n");
132 h__dump (salt, saltlen);
133 fprintf(stderr, "Iteration count %d\n", iter);
134 fprintf(stderr, "Key:\n");
135 h__dump (out, keylen);
140 int PKCS5_PBKDF2_HMAC_SHA1(const char *pass, int passlen,
141 const unsigned char *salt, int saltlen, int iter,
142 int keylen, unsigned char *out)
144 return PKCS5_PBKDF2_HMAC(pass, passlen, salt, saltlen, iter, EVP_sha1(),
151 unsigned char out[4];
152 unsigned char salt[] = {0x12, 0x34, 0x56, 0x78};
153 PKCS5_PBKDF2_HMAC_SHA1("password", -1, salt, 4, 5, 4, out);
154 fprintf(stderr, "Out %02X %02X %02X %02X\n",
155 out[0], out[1], out[2], out[3]);
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
165 int PKCS5_v2_PBE_keyivgen(EVP_CIPHER_CTX *ctx, const char *pass, int passlen,
166 ASN1_TYPE *param, const EVP_CIPHER *c, const EVP_MD *md,
169 unsigned char *salt, key[EVP_MAX_KEY_LENGTH];
170 const unsigned char *pbuf;
171 int saltlen, iter, plen;
173 PBE2PARAM *pbe2 = NULL;
174 const EVP_CIPHER *cipher;
175 PBKDF2PARAM *kdf = NULL;
177 int prf_nid, hmac_md_nid;
179 if (param == NULL || param->type != V_ASN1_SEQUENCE ||
180 param->value.sequence == NULL) {
181 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,EVP_R_DECODE_ERROR);
185 pbuf = param->value.sequence->data;
186 plen = param->value.sequence->length;
187 if(!(pbe2 = d2i_PBE2PARAM(NULL, &pbuf, plen))) {
188 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,EVP_R_DECODE_ERROR);
192 /* See if we recognise the key derivation function */
194 if(OBJ_obj2nid(pbe2->keyfunc->algorithm) != NID_id_pbkdf2) {
195 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,
196 EVP_R_UNSUPPORTED_KEY_DERIVATION_FUNCTION);
200 /* lets see if we recognise the encryption algorithm.
203 cipher = EVP_get_cipherbyobj(pbe2->encryption->algorithm);
206 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,
207 EVP_R_UNSUPPORTED_CIPHER);
211 /* Fixup cipher based on AlgorithmIdentifier */
212 EVP_CipherInit_ex(ctx, cipher, NULL, NULL, NULL, en_de);
213 if(EVP_CIPHER_asn1_to_param(ctx, pbe2->encryption->parameter) < 0) {
214 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,
215 EVP_R_CIPHER_PARAMETER_ERROR);
218 keylen = EVP_CIPHER_CTX_key_length(ctx);
219 OPENSSL_assert(keylen <= sizeof key);
221 /* Now decode key derivation function */
223 if(!pbe2->keyfunc->parameter ||
224 (pbe2->keyfunc->parameter->type != V_ASN1_SEQUENCE))
226 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,EVP_R_DECODE_ERROR);
230 pbuf = pbe2->keyfunc->parameter->value.sequence->data;
231 plen = pbe2->keyfunc->parameter->value.sequence->length;
232 if(!(kdf = d2i_PBKDF2PARAM(NULL, &pbuf, plen)) ) {
233 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,EVP_R_DECODE_ERROR);
237 PBE2PARAM_free(pbe2);
240 /* Now check the parameters of the kdf */
242 if(kdf->keylength && (ASN1_INTEGER_get(kdf->keylength) != (int)keylen)){
243 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,
244 EVP_R_UNSUPPORTED_KEYLENGTH);
249 prf_nid = OBJ_obj2nid(kdf->prf->algorithm);
251 prf_nid = NID_hmacWithSHA1;
253 if (!EVP_PBE_find(EVP_PBE_TYPE_PRF, prf_nid, NULL, &hmac_md_nid, 0))
255 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN, EVP_R_UNSUPPORTED_PRF);
259 prfmd = EVP_get_digestbynid(hmac_md_nid);
262 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN, EVP_R_UNSUPPORTED_PRF);
266 if(kdf->salt->type != V_ASN1_OCTET_STRING) {
267 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,
268 EVP_R_UNSUPPORTED_SALT_TYPE);
272 /* it seems that its all OK */
273 salt = kdf->salt->value.octet_string->data;
274 saltlen = kdf->salt->value.octet_string->length;
275 iter = ASN1_INTEGER_get(kdf->iter);
276 PKCS5_PBKDF2_HMAC(pass, passlen, salt, saltlen, iter, prfmd,
278 EVP_CipherInit_ex(ctx, NULL, NULL, key, NULL, en_de);
279 OPENSSL_cleanse(key, keylen);
280 PBKDF2PARAM_free(kdf);
284 PBE2PARAM_free(pbe2);
285 PBKDF2PARAM_free(kdf);
290 static void h__dump (const unsigned char *p, int len)
292 for (; len --; p++) fprintf(stderr, "%02X ", *p);
293 fprintf(stderr, "\n");