crypto/evp/p5_crpt2.c

   1 /* p5_crpt2.c */
   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 #include <stdio.h>
  59 #include <stdlib.h>
  60 #include "cryptlib.h"
  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>
  65 #include "evp_locl.h"
  66
  67 /* set this to print out info about the keygen algorithm */
  68 /* #define DEBUG_PKCS5V2 */
  69
  70 #ifdef DEBUG_PKCS5V2
  71         static void h__dump (const unsigned char *p, int len);
  72 #endif
  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 PKCS5_PBKDF2_HMAC(const char *pass, int passlen,
  81                            const unsigned char *salt, int saltlen, int iter,
  82                            const EVP_MD *digest,
  83                            int keylen, unsigned char *out)
  84         {
  85         unsigned char digtmp[EVP_MAX_MD_SIZE], *p, itmp[4];
  86         int cplen, j, k, tkeylen, mdlen;
  87         unsigned long i = 1;
  88         HMAC_CTX hctx_tpl, hctx;
  89
  90         mdlen = EVP_MD_size(digest);
  91         if (mdlen < 0)
  92                 return 0;
  93
  94         HMAC_CTX_init(&hctx_tpl);
  95         p = out;
  96         tkeylen = keylen;
  97         if(!pass)
  98                 passlen = 0;
  99         else if(passlen == -1)
 100                 passlen = strlen(pass);
 101         if (!HMAC_Init_ex(&hctx_tpl, pass, passlen, digest, NULL))
 102                 {
 103                 HMAC_CTX_cleanup(&hctx_tpl);
 104                 return 0;
 105                 }
 106         while(tkeylen)
 107                 {
 108                 if(tkeylen > mdlen)
 109                         cplen = mdlen;
 110                 else
 111                         cplen = tkeylen;
 112                 /* We are unlikely to ever use more than 256 blocks (5120 bits!)
 113                  * but just in case...
 114                  */
 115                 itmp[0] = (unsigned char)((i >> 24) & 0xff);
 116                 itmp[1] = (unsigned char)((i >> 16) & 0xff);
 117                 itmp[2] = (unsigned char)((i >> 8) & 0xff);
 118                 itmp[3] = (unsigned char)(i & 0xff);
 119                 if (!HMAC_CTX_copy(&hctx, &hctx_tpl))
 120                         {
 121                         HMAC_CTX_cleanup(&hctx_tpl);
 122                         return 0;
 123                         }
 124                 if (!HMAC_Update(&hctx, salt, saltlen)
 125                     || !HMAC_Update(&hctx, itmp, 4)
 126                     || !HMAC_Final(&hctx, digtmp, NULL))
 127                         {
 128                         HMAC_CTX_cleanup(&hctx_tpl);
 129                         HMAC_CTX_cleanup(&hctx);
 130                         return 0;
 131                         }
 132                 HMAC_CTX_cleanup(&hctx);
 133                 memcpy(p, digtmp, cplen);
 134                 for(j = 1; j < iter; j++)
 135                         {
 136                         if (!HMAC_CTX_copy(&hctx, &hctx_tpl))
 137                                 {
 138                                 HMAC_CTX_cleanup(&hctx_tpl);
 139                                 return 0;
 140                                 }
 141                         if (!HMAC_Update(&hctx, digtmp, mdlen)
 142                             || !HMAC_Final(&hctx, digtmp, NULL))
 143                                 {
 144                                 HMAC_CTX_cleanup(&hctx_tpl);
 145                                 HMAC_CTX_cleanup(&hctx);
 146                                 return 0;
 147                                 }
 148                         HMAC_CTX_cleanup(&hctx);
 149                         for(k = 0; k < cplen; k++)
 150                                 p[k] ^= digtmp[k];
 151                         }
 152                 tkeylen-= cplen;
 153                 i++;
 154                 p+= cplen;
 155                 }
 156         HMAC_CTX_cleanup(&hctx_tpl);
 157 #ifdef DEBUG_PKCS5V2
 158         fprintf(stderr, "Password:\n");
 159         h__dump (pass, passlen);
 160         fprintf(stderr, "Salt:\n");
 161         h__dump (salt, saltlen);
 162         fprintf(stderr, "Iteration count %d\n", iter);
 163         fprintf(stderr, "Key:\n");
 164         h__dump (out, keylen);
 165 #endif
 166         return 1;
 167         }
 168
 169 int PKCS5_PBKDF2_HMAC_SHA1(const char *pass, int passlen,
 170                            const unsigned char *salt, int saltlen, int iter,
 171                            int keylen, unsigned char *out)
 172         {
 173         return PKCS5_PBKDF2_HMAC(pass, passlen, salt, saltlen, iter, EVP_sha1(),
 174                                         keylen, out);
 175         }
 176
 177 #ifdef DO_TEST
 178 main()
 179 {
 180         unsigned char out[4];
 181         unsigned char salt[] = {0x12, 0x34, 0x56, 0x78};
 182         PKCS5_PBKDF2_HMAC_SHA1("password", -1, salt, 4, 5, 4, out);
 183         fprintf(stderr, "Out %02X %02X %02X %02X\n",
 184                                          out[0], out[1], out[2], out[3]);
 185 }
 186
 187 #endif
 188
 189 /* Now the key derivation function itself. This is a bit evil because
 190  * it has to check the ASN1 parameters are valid: and there are quite a
 191  * few of them...
 192  */
 193
 194 int PKCS5_v2_PBE_keyivgen(EVP_CIPHER_CTX *ctx, const char *pass, int passlen,
 195                          ASN1_TYPE *param, const EVP_CIPHER *c, const EVP_MD *md,
 196                          int en_de)
 197 {
 198         const unsigned char *pbuf;
 199         int plen;
 200         PBE2PARAM *pbe2 = NULL;
 201         const EVP_CIPHER *cipher;
 202
 203         int rv = 0;
 204
 205         if (param == NULL || param->type != V_ASN1_SEQUENCE ||
 206             param->value.sequence == NULL) {
 207                 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,EVP_R_DECODE_ERROR);
 208                 goto err;
 209         }
 210
 211         pbuf = param->value.sequence->data;
 212         plen = param->value.sequence->length;
 213         if(!(pbe2 = d2i_PBE2PARAM(NULL, &pbuf, plen))) {
 214                 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,EVP_R_DECODE_ERROR);
 215                 goto err;
 216         }
 217
 218         /* See if we recognise the key derivation function */
 219
 220         if(OBJ_obj2nid(pbe2->keyfunc->algorithm) != NID_id_pbkdf2) {
 221                 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,
 222                                 EVP_R_UNSUPPORTED_KEY_DERIVATION_FUNCTION);
 223                 goto err;
 224         }
 225
 226         /* lets see if we recognise the encryption algorithm.
 227          */
 228
 229         cipher = EVP_get_cipherbyobj(pbe2->encryption->algorithm);
 230
 231         if(!cipher) {
 232                 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,
 233                                                 EVP_R_UNSUPPORTED_CIPHER);
 234                 goto err;
 235         }
 236
 237         /* Fixup cipher based on AlgorithmIdentifier */
 238         if (!EVP_CipherInit_ex(ctx, cipher, NULL, NULL, NULL, en_de))
 239                 goto err;
 240         if(EVP_CIPHER_asn1_to_param(ctx, pbe2->encryption->parameter) < 0) {
 241                 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,
 242                                         EVP_R_CIPHER_PARAMETER_ERROR);
 243                 goto err;
 244         }
 245         rv = PKCS5_v2_PBKDF2_keyivgen(ctx, pass, passlen,
 246                                         pbe2->keyfunc->parameter, c, md, en_de);
 247         err:
 248         PBE2PARAM_free(pbe2);
 249         return rv;
 250 }
 251
 252 int PKCS5_v2_PBKDF2_keyivgen(EVP_CIPHER_CTX *ctx, const char *pass, int passlen,
 253                          ASN1_TYPE *param,
 254                          const EVP_CIPHER *c, const EVP_MD *md, int en_de)
 255 {
 256         unsigned char *salt, key[EVP_MAX_KEY_LENGTH];
 257         const unsigned char *pbuf;
 258         int saltlen, iter, plen;
 259         int rv = 0;
 260         unsigned int keylen = 0;
 261         int prf_nid, hmac_md_nid;
 262         PBKDF2PARAM *kdf = NULL;
 263         const EVP_MD *prfmd;
 264
 265         if (EVP_CIPHER_CTX_cipher(ctx) == NULL)
 266                 {
 267                 EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN,EVP_R_NO_CIPHER_SET);
 268                 goto err;
 269                 }
 270         keylen = EVP_CIPHER_CTX_key_length(ctx);
 271         OPENSSL_assert(keylen <= sizeof key);
 272
 273         /* Decode parameter */
 274
 275         if(!param || (param->type != V_ASN1_SEQUENCE))
 276                 {
 277                 EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN,EVP_R_DECODE_ERROR);
 278                 goto err;
 279                 }
 280
 281         pbuf = param->value.sequence->data;
 282         plen = param->value.sequence->length;
 283
 284         if(!(kdf = d2i_PBKDF2PARAM(NULL, &pbuf, plen)) ) {
 285                 EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN,EVP_R_DECODE_ERROR);
 286                 goto err;
 287         }
 288
 289         keylen = EVP_CIPHER_CTX_key_length(ctx);
 290
 291         /* Now check the parameters of the kdf */
 292
 293         if(kdf->keylength && (ASN1_INTEGER_get(kdf->keylength) != (int)keylen)){
 294                 EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN,
 295                                                 EVP_R_UNSUPPORTED_KEYLENGTH);
 296                 goto err;
 297         }
 298
 299         if (kdf->prf)
 300                 prf_nid = OBJ_obj2nid(kdf->prf->algorithm);
 301         else
 302                 prf_nid = NID_hmacWithSHA1;
 303
 304         if (!EVP_PBE_find(EVP_PBE_TYPE_PRF, prf_nid, NULL, &hmac_md_nid, 0))
 305                 {
 306                 EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_UNSUPPORTED_PRF);
 307                 goto err;
 308                 }
 309
 310         prfmd = EVP_get_digestbynid(hmac_md_nid);
 311         if (prfmd == NULL)
 312                 {
 313                 EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_UNSUPPORTED_PRF);
 314                 goto err;
 315                 }
 316
 317         if(kdf->salt->type != V_ASN1_OCTET_STRING) {
 318                 EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN,
 319                                                 EVP_R_UNSUPPORTED_SALT_TYPE);
 320                 goto err;
 321         }
 322
 323         /* it seems that its all OK */
 324         salt = kdf->salt->value.octet_string->data;
 325         saltlen = kdf->salt->value.octet_string->length;
 326         iter = ASN1_INTEGER_get(kdf->iter);
 327         if(!PKCS5_PBKDF2_HMAC(pass, passlen, salt, saltlen, iter, prfmd,
 328                                                    keylen, key))
 329                 goto err;
 330         rv = EVP_CipherInit_ex(ctx, NULL, NULL, key, NULL, en_de);
 331         err:
 332         OPENSSL_cleanse(key, keylen);
 333         PBKDF2PARAM_free(kdf);
 334         return rv;
 335 }
 336
 337 #ifdef DEBUG_PKCS5V2
 338 static void h__dump (const unsigned char *p, int len)
 339 {
 340         for (; len --; p++) fprintf(stderr, "%02X ", *p);
 341         fprintf(stderr, "\n");
 342 }
 343 #endif
 344 #endif