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1/* p5_crpt2.c */
2/* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
3 * project 1999.
4 */
5/* ====================================================================
6 * Copyright (c) 1999 The OpenSSL Project. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 *
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
18 * distribution.
19 *
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/)"
24 *
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.
29 *
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.
33 *
34 * 6. Redistributions of any form whatsoever must retain the following
35 * acknowledgment:
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
38 *
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 * ====================================================================
52 *
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).
56 *
57 */
58#if !defined(OPENSSL_NO_HMAC) && !defined(OPENSSL_NO_SHA)
59#include <stdio.h>
60#include <stdlib.h>
61#include "cryptlib.h"
62#include <openssl/x509.h>
63#include <openssl/evp.h>
64#include <openssl/hmac.h>
65
66/* set this to print out info about the keygen algorithm */
67/* #define DEBUG_PKCS5V2 */
68
69#ifdef DEBUG_PKCS5V2
70 static void h__dump (const unsigned char *p, int len);
71#endif
72
73/* This is an implementation of PKCS#5 v2.0 password based encryption key
74 * derivation function PBKDF2 using the only currently defined function HMAC
75 * with SHA1. Verified against test vectors posted by Peter Gutmann
76 * <pgut001@cs.auckland.ac.nz> to the PKCS-TNG <pkcs-tng@rsa.com> mailing list.
77 */
78
79int PKCS5_PBKDF2_HMAC_SHA1(const char *pass, int passlen,
80 unsigned char *salt, int saltlen, int iter,
81 int keylen, unsigned char *out)
82{
83 unsigned char digtmp[SHA_DIGEST_LENGTH], *p, itmp[4];
84 int cplen, j, k, tkeylen;
85 unsigned long i = 1;
86 HMAC_CTX hctx;
87
88 HMAC_CTX_init(&hctx);
89 p = out;
90 tkeylen = keylen;
91 if(!pass) passlen = 0;
92 else if(passlen == -1) passlen = strlen(pass);
93 while(tkeylen) {
94 if(tkeylen > SHA_DIGEST_LENGTH) cplen = SHA_DIGEST_LENGTH;
95 else cplen = tkeylen;
96 /* We are unlikely to ever use more than 256 blocks (5120 bits!)
97 * but just in case...
98 */
99 itmp[0] = (unsigned char)((i >> 24) & 0xff);
100 itmp[1] = (unsigned char)((i >> 16) & 0xff);
101 itmp[2] = (unsigned char)((i >> 8) & 0xff);
102 itmp[3] = (unsigned char)(i & 0xff);
103 HMAC_Init_ex(&hctx, pass, passlen, EVP_sha1(), NULL);
104 HMAC_Update(&hctx, salt, saltlen);
105 HMAC_Update(&hctx, itmp, 4);
106 HMAC_Final(&hctx, digtmp, NULL);
107 memcpy(p, digtmp, cplen);
108 for(j = 1; j < iter; j++) {
109 HMAC(EVP_sha1(), pass, passlen,
110 digtmp, SHA_DIGEST_LENGTH, digtmp, NULL);
111 for(k = 0; k < cplen; k++) p[k] ^= digtmp[k];
112 }
113 tkeylen-= cplen;
114 i++;
115 p+= cplen;
116 }
117 HMAC_CTX_cleanup(&hctx);
118#ifdef DEBUG_PKCS5V2
119 fprintf(stderr, "Password:\n");
120 h__dump (pass, passlen);
121 fprintf(stderr, "Salt:\n");
122 h__dump (salt, saltlen);
123 fprintf(stderr, "Iteration count %d\n", iter);
124 fprintf(stderr, "Key:\n");
125 h__dump (out, keylen);
126#endif
127 return 1;
128}
129
130#ifdef DO_TEST
131main()
132{
133 unsigned char out[4];
134 unsigned char salt[] = {0x12, 0x34, 0x56, 0x78};
135 PKCS5_PBKDF2_HMAC_SHA1("password", -1, salt, 4, 5, 4, out);
136 fprintf(stderr, "Out %02X %02X %02X %02X\n",
137 out[0], out[1], out[2], out[3]);
138}
139
140#endif
141
142/* Now the key derivation function itself. This is a bit evil because
143 * it has to check the ASN1 parameters are valid: and there are quite a
144 * few of them...
145 */
146
147int PKCS5_v2_PBE_keyivgen(EVP_CIPHER_CTX *ctx, const char *pass, int passlen,
148 ASN1_TYPE *param, const EVP_CIPHER *c, const EVP_MD *md,
149 int en_de)
150{
151 unsigned char *pbuf, *salt, key[EVP_MAX_KEY_LENGTH];
152 int saltlen, keylen, iter, plen;
153 PBE2PARAM *pbe2 = NULL;
154 const EVP_CIPHER *cipher;
155 PBKDF2PARAM *kdf = NULL;
156
157 pbuf = param->value.sequence->data;
158 plen = param->value.sequence->length;
159 if(!param || (param->type != V_ASN1_SEQUENCE) ||
160 !(pbe2 = d2i_PBE2PARAM(NULL, &pbuf, plen))) {
161 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,EVP_R_DECODE_ERROR);
162 return 0;
163 }
164
165 /* See if we recognise the key derivation function */
166
167 if(OBJ_obj2nid(pbe2->keyfunc->algorithm) != NID_id_pbkdf2) {
168 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,
169 EVP_R_UNSUPPORTED_KEY_DERIVATION_FUNCTION);
170 goto err;
171 }
172
173 /* lets see if we recognise the encryption algorithm.
174 */
175
176 cipher = EVP_get_cipherbyname(
177 OBJ_nid2sn(OBJ_obj2nid(pbe2->encryption->algorithm)));
178
179 if(!cipher) {
180 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,
181 EVP_R_UNSUPPORTED_CIPHER);
182 goto err;
183 }
184
185 /* Fixup cipher based on AlgorithmIdentifier */
186 EVP_CipherInit_ex(ctx, cipher, NULL, NULL, NULL, en_de);
187 if(EVP_CIPHER_asn1_to_param(ctx, pbe2->encryption->parameter) < 0) {
188 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,
189 EVP_R_CIPHER_PARAMETER_ERROR);
190 goto err;
191 }
192 keylen = EVP_CIPHER_CTX_key_length(ctx);
193 OPENSSL_assert(keylen <= sizeof key);
194
195 /* Now decode key derivation function */
196
197 if(!pbe2->keyfunc->parameter ||
198 (pbe2->keyfunc->parameter->type != V_ASN1_SEQUENCE))
199 {
200 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,EVP_R_DECODE_ERROR);
201 goto err;
202 }
203
204 pbuf = pbe2->keyfunc->parameter->value.sequence->data;
205 plen = pbe2->keyfunc->parameter->value.sequence->length;
206 if(!(kdf = d2i_PBKDF2PARAM(NULL, &pbuf, plen)) ) {
207 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,EVP_R_DECODE_ERROR);
208 goto err;
209 }
210
211 PBE2PARAM_free(pbe2);
212 pbe2 = NULL;
213
214 /* Now check the parameters of the kdf */
215
216 if(kdf->keylength && (ASN1_INTEGER_get(kdf->keylength) != keylen)){
217 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,
218 EVP_R_UNSUPPORTED_KEYLENGTH);
219 goto err;
220 }
221
222 if(kdf->prf && (OBJ_obj2nid(kdf->prf->algorithm) != NID_hmacWithSHA1)) {
223 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN, EVP_R_UNSUPPORTED_PRF);
224 goto err;
225 }
226
227 if(kdf->salt->type != V_ASN1_OCTET_STRING) {
228 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,
229 EVP_R_UNSUPPORTED_SALT_TYPE);
230 goto err;
231 }
232
233 /* it seems that its all OK */
234 salt = kdf->salt->value.octet_string->data;
235 saltlen = kdf->salt->value.octet_string->length;
236 iter = ASN1_INTEGER_get(kdf->iter);
237 PKCS5_PBKDF2_HMAC_SHA1(pass, passlen, salt, saltlen, iter, keylen, key);
238 EVP_CipherInit_ex(ctx, NULL, NULL, key, NULL, en_de);
239 OPENSSL_cleanse(key, keylen);
240 PBKDF2PARAM_free(kdf);
241 return 1;
242
243 err:
244 PBE2PARAM_free(pbe2);
245 PBKDF2PARAM_free(kdf);
246 return 0;
247}
248
249#ifdef DEBUG_PKCS5V2
250static void h__dump (const unsigned char *p, int len)
251{
252 for (; len --; p++) fprintf(stderr, "%02X ", *p);
253 fprintf(stderr, "\n");
254}
255#endif
256#endif
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