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 3 * project 1999. 4 */ 5 /* ==================================================================== 6 * Copyright (c) 1999-2006 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 59 #include <stdio.h> 60 #include <stdlib.h> 61 #include <string.h> 62 63 #include <openssl/opensslconf.h> 64 65 #if !defined(OPENSSL_NO_HMAC) && !defined(OPENSSL_NO_SHA) 66 67 #include <openssl/err.h> 68 #include <openssl/evp.h> 69 #include <openssl/hmac.h> 70 #include <openssl/x509.h> 71 72 #include "evp_locl.h" 73 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. 78 */ 79 80 int 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) 83 { 84 unsigned char digtmp[EVP_MAX_MD_SIZE], *p, itmp[4]; 85 int cplen, j, k, tkeylen, mdlen; 86 unsigned long i = 1; 87 HMAC_CTX hctx_tpl, hctx; 88 89 mdlen = EVP_MD_size(digest); 90 if (mdlen < 0) 91 return 0; 92 93 HMAC_CTX_init(&hctx_tpl); 94 p = out; 95 tkeylen = keylen; 96 if (!pass) 97 passlen = 0; 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); 102 return 0; 103 } 104 while (tkeylen) { 105 if (tkeylen > mdlen) 106 cplen = mdlen; 107 else 108 cplen = tkeylen; 109 /* We are unlikely to ever use more than 256 blocks (5120 bits!) 110 * but just in case... 111 */ 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); 118 return 0; 119 } 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); 125 return 0; 126 } 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); 132 return 0; 133 } 134 if (!HMAC_Update(&hctx, digtmp, mdlen) || 135 !HMAC_Final(&hctx, digtmp, NULL)) { 136 HMAC_CTX_cleanup(&hctx_tpl); 137 HMAC_CTX_cleanup(&hctx); 138 return 0; 139 } 140 HMAC_CTX_cleanup(&hctx); 141 for (k = 0; k < cplen; k++) 142 p[k] ^= digtmp[k]; 143 } 144 tkeylen -= cplen; 145 i++; 146 p += cplen; 147 } 148 HMAC_CTX_cleanup(&hctx_tpl); 149 return 1; 150 } 151 152 int 153 PKCS5_PBKDF2_HMAC_SHA1(const char *pass, int passlen, const unsigned char *salt, 154 int saltlen, int iter, int keylen, unsigned char *out) 155 { 156 return PKCS5_PBKDF2_HMAC(pass, passlen, salt, saltlen, iter, 157 EVP_sha1(), keylen, out); 158 } 159 160 /* 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 162 * few of them... 163 */ 164 165 int 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) 168 { 169 const unsigned char *pbuf; 170 int plen; 171 PBE2PARAM *pbe2 = NULL; 172 const EVP_CIPHER *cipher; 173 174 int rv = 0; 175 176 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); 179 goto err; 180 } 181 182 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); 186 goto err; 187 } 188 189 /* See if we recognise the key derivation function */ 190 191 if (OBJ_obj2nid(pbe2->keyfunc->algorithm) != NID_id_pbkdf2) { 192 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN, 193 EVP_R_UNSUPPORTED_KEY_DERIVATION_FUNCTION); 194 goto err; 195 } 196 197 /* lets see if we recognise the encryption algorithm. 198 */ 199 200 cipher = EVP_get_cipherbyobj(pbe2->encryption->algorithm); 201 202 if (!cipher) { 203 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN, 204 EVP_R_UNSUPPORTED_CIPHER); 205 goto err; 206 } 207 208 /* Fixup cipher based on AlgorithmIdentifier */ 209 if (!EVP_CipherInit_ex(ctx, cipher, NULL, NULL, NULL, en_de)) 210 goto err; 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); 214 goto err; 215 } 216 rv = PKCS5_v2_PBKDF2_keyivgen(ctx, pass, passlen, 217 pbe2->keyfunc->parameter, c, md, en_de); 218 219 err: 220 PBE2PARAM_free(pbe2); 221 return rv; 222 } 223 224 int 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) 227 { 228 unsigned char *salt, key[EVP_MAX_KEY_LENGTH]; 229 const unsigned char *pbuf; 230 int saltlen, iter, plen; 231 int rv = 0; 232 unsigned int keylen = 0; 233 int prf_nid, hmac_md_nid; 234 PBKDF2PARAM *kdf = NULL; 235 const EVP_MD *prfmd; 236 237 if (EVP_CIPHER_CTX_cipher(ctx) == NULL) { 238 EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_NO_CIPHER_SET); 239 return 0; 240 } 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); 244 return 0; 245 } 246 247 /* Decode parameter */ 248 249 if (!param || (param->type != V_ASN1_SEQUENCE)) { 250 EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_DECODE_ERROR); 251 return 0; 252 } 253 254 pbuf = param->value.sequence->data; 255 plen = param->value.sequence->length; 256 257 if (!(kdf = d2i_PBKDF2PARAM(NULL, &pbuf, plen)) ) { 258 EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_DECODE_ERROR); 259 return 0; 260 } 261 262 /* Now check the parameters of the kdf */ 263 264 if (kdf->keylength && 265 (ASN1_INTEGER_get(kdf->keylength) != (int)keylen)){ 266 EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, 267 EVP_R_UNSUPPORTED_KEYLENGTH); 268 goto err; 269 } 270 271 if (kdf->prf) 272 prf_nid = OBJ_obj2nid(kdf->prf->algorithm); 273 else 274 prf_nid = NID_hmacWithSHA1; 275 276 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); 278 goto err; 279 } 280 281 prfmd = EVP_get_digestbynid(hmac_md_nid); 282 if (prfmd == NULL) { 283 EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_UNSUPPORTED_PRF); 284 goto err; 285 } 286 287 if (kdf->salt->type != V_ASN1_OCTET_STRING) { 288 EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, 289 EVP_R_UNSUPPORTED_SALT_TYPE); 290 goto err; 291 } 292 293 /* 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, 298 keylen, key)) 299 goto err; 300 rv = EVP_CipherInit_ex(ctx, NULL, NULL, key, NULL, en_de); 301 302 err: 303 explicit_bzero(key, keylen); 304 PBKDF2PARAM_free(kdf); 305 return rv; 306 } 307 308 #endif 309