]>
Commit | Line | Data |
---|---|---|
97e4a932 DSH |
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 | #include <stdio.h> | |
59 | #include <stdlib.h> | |
60 | #include <openssl/x509.h> | |
61 | #include <openssl/evp.h> | |
62 | #include <openssl/hmac.h> | |
63 | #include "cryptlib.h" | |
64 | ||
65 | /* This is an implementation of PKCS#5 v2.0 password based encryption key | |
66 | * derivation function PBKDF2 using the only currently defined function HMAC | |
67 | * with SHA1. Verified against test vectors posted by Peter Gutmann | |
68 | * <pgut001@cs.auckland.ac.nz> to the PKCS-TNG <pkcs-tng@rsa.com> mailing list. | |
69 | */ | |
70 | ||
71 | int PKCS5_PBKDF2_HMAC_SHA1(const char *pass, int passlen, | |
72 | unsigned char *salt, int saltlen, int iter, | |
73 | int keylen, unsigned char *out) | |
74 | { | |
75 | unsigned char digtmp[SHA_DIGEST_LENGTH], *p, itmp[4]; | |
76 | int cplen, j, k; | |
77 | unsigned long i = 1; | |
78 | HMAC_CTX hctx; | |
79 | p = out; | |
80 | if(passlen == -1) passlen = strlen(pass); | |
81 | while(keylen) { | |
82 | if(keylen > SHA_DIGEST_LENGTH) cplen = SHA_DIGEST_LENGTH; | |
83 | else cplen = keylen; | |
84 | /* We are unlikely to ever use more than 256 blocks (5120 bits!) | |
85 | * but just in case... | |
86 | */ | |
87 | itmp[0] = (i >> 24) & 0xff; | |
88 | itmp[1] = (i >> 16) & 0xff; | |
89 | itmp[2] = (i >> 8) & 0xff; | |
90 | itmp[3] = i & 0xff; | |
91 | HMAC_Init(&hctx, pass, passlen, EVP_sha1()); | |
92 | HMAC_Update(&hctx, salt, saltlen); | |
93 | HMAC_Update(&hctx, itmp, 4); | |
94 | HMAC_Final(&hctx, digtmp, NULL); | |
95 | memcpy(p, digtmp, cplen); | |
96 | for(j = 1; j < iter; j++) { | |
97 | HMAC(EVP_sha1(), pass, passlen, | |
98 | digtmp, SHA_DIGEST_LENGTH, digtmp, NULL); | |
99 | for(k = 0; k < cplen; k++) p[k] ^= digtmp[k]; | |
100 | } | |
101 | keylen-= cplen; | |
102 | i++; | |
103 | p+= cplen; | |
104 | } | |
105 | HMAC_cleanup(&hctx); | |
106 | return 1; | |
107 | } | |
108 | ||
109 | #ifdef DO_TEST | |
110 | main() | |
111 | { | |
112 | unsigned char out[4]; | |
113 | unsigned char salt[] = {0x12, 0x34, 0x56, 0x78}; | |
114 | PKCS5_PBKDF2_HMAC_SHA1("password", -1, salt, 4, 5, 4, out); | |
115 | fprintf(stderr, "Out %02X %02X %02X %02X\n", | |
116 | out[0], out[1], out[2], out[3]); | |
117 | } | |
118 | ||
119 | #endif | |
120 | ||
121 | /* Now the key derivation function itself. This is a bit evil because | |
122 | * it has to check the ASN1 parameters are valid: and there are quite a | |
123 | * few of them... | |
124 | */ | |
125 | ||
126 | int PKCS5_v2_PBE_keyivgen(EVP_CIPHER_CTX *ctx, const char *pass, int passlen, | |
127 | ASN1_TYPE *param, EVP_CIPHER *c, EVP_MD *md, | |
128 | int en_de) | |
129 | { | |
130 | unsigned char *pbuf, *salt, key[EVP_MAX_KEY_LENGTH]; | |
131 | int saltlen, keylen, iter, plen; | |
132 | PBE2PARAM *pbe2 = NULL; | |
133 | const EVP_CIPHER *cipher; | |
134 | PBKDF2PARAM *kdf = NULL; | |
135 | ||
136 | pbuf = param->value.sequence->data; | |
137 | plen = param->value.sequence->length; | |
138 | if(!param || (param->type != V_ASN1_SEQUENCE) || | |
139 | !(pbe2 = d2i_PBE2PARAM(NULL, &pbuf, plen))) { | |
140 | EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,EVP_R_DECODE_ERROR); | |
141 | return 0; | |
142 | } | |
143 | ||
144 | /* See if we recognise the key derivation function */ | |
145 | ||
146 | if(OBJ_obj2nid(pbe2->keyfunc->algorithm) != NID_id_pbkdf2) { | |
147 | EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN, | |
148 | EVP_R_UNSUPPORTED_KEY_DERIVATION_FUNCTION); | |
149 | goto err; | |
150 | } | |
151 | ||
152 | /* lets see if we recognise the encryption algorithm. | |
153 | */ | |
154 | ||
155 | cipher = EVP_get_cipherbyname( | |
156 | OBJ_nid2sn(OBJ_obj2nid(pbe2->encryption->algorithm))); | |
157 | ||
158 | if(!cipher) { | |
159 | EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN, | |
160 | EVP_R_UNSUPPORTED_CIPHER); | |
161 | goto err; | |
162 | } | |
163 | ||
164 | /* Fixup cipher based on AlgorithmIdentifier */ | |
165 | EVP_CipherInit(ctx, cipher, NULL, NULL, en_de); | |
166 | if(EVP_CIPHER_asn1_to_param(ctx, pbe2->encryption->parameter) < 0) { | |
167 | EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN, | |
168 | EVP_R_CIPHER_PARAMETER_ERROR); | |
169 | goto err; | |
170 | } | |
171 | keylen = EVP_CIPHER_CTX_key_length(ctx); | |
172 | ||
173 | /* Now decode key derivation function */ | |
174 | ||
175 | pbuf = pbe2->keyfunc->parameter->value.sequence->data; | |
176 | plen = pbe2->keyfunc->parameter->value.sequence->length; | |
177 | if(!pbe2->keyfunc->parameter || | |
178 | (pbe2->keyfunc->parameter->type != V_ASN1_SEQUENCE) || | |
179 | !(kdf = d2i_PBKDF2PARAM(NULL, &pbuf, plen)) ) { | |
180 | EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,EVP_R_DECODE_ERROR); | |
181 | goto err; | |
182 | } | |
183 | ||
184 | PBE2PARAM_free(pbe2); | |
185 | pbe2 = NULL; | |
186 | ||
187 | /* Now check the parameters of the kdf */ | |
188 | ||
189 | if(kdf->keylength && (ASN1_INTEGER_get(kdf->keylength) != keylen)){ | |
190 | EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN, | |
191 | EVP_R_UNSUPPORTED_KEYLENGTH); | |
192 | goto err; | |
193 | } | |
194 | ||
195 | if(kdf->prf && (OBJ_obj2nid(kdf->prf->algorithm) != NID_hmacWithSHA1)) { | |
196 | EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN, EVP_R_UNSUPPORTED_PRF); | |
197 | goto err; | |
198 | } | |
199 | ||
200 | if(kdf->salt->type != V_ASN1_OCTET_STRING) { | |
201 | EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN, | |
202 | EVP_R_UNSUPPORTED_SALT_TYPE); | |
203 | goto err; | |
204 | } | |
205 | ||
206 | /* it seems that its all OK */ | |
207 | salt = kdf->salt->value.octet_string->data; | |
208 | saltlen = kdf->salt->value.octet_string->length; | |
209 | iter = ASN1_INTEGER_get(kdf->iter); | |
210 | PKCS5_PBKDF2_HMAC_SHA1(pass, passlen, salt, saltlen, iter, keylen, key); | |
211 | EVP_CipherInit(ctx, NULL, key, NULL, en_de); | |
212 | memset(key, 0, keylen); | |
213 | PBKDF2PARAM_free(kdf); | |
214 | return 1; | |
215 | ||
216 | err: | |
217 | PBE2PARAM_free(pbe2); | |
218 | PBKDF2PARAM_free(kdf); | |
219 | return 0; | |
220 | } | |
221 |