crypto/openssl-0.9.7e/crypto/evp/p5_crpt2.c

   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
  79 int 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
 131 main()
 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
 147 int 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         pbuf = pbe2->keyfunc->parameter->value.sequence->data;
 198         plen = pbe2->keyfunc->parameter->value.sequence->length;
 199         if(!pbe2->keyfunc->parameter ||
 200                  (pbe2->keyfunc->parameter->type != V_ASN1_SEQUENCE) ||
 201                                 !(kdf = d2i_PBKDF2PARAM(NULL, &pbuf, plen)) ) {
 202                 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,EVP_R_DECODE_ERROR);
 203                 goto err;
 204         }
 205
 206         PBE2PARAM_free(pbe2);
 207         pbe2 = NULL;
 208
 209         /* Now check the parameters of the kdf */
 210
 211         if(kdf->keylength && (ASN1_INTEGER_get(kdf->keylength) != keylen)){
 212                 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,
 213                                                 EVP_R_UNSUPPORTED_KEYLENGTH);
 214                 goto err;
 215         }
 216
 217         if(kdf->prf && (OBJ_obj2nid(kdf->prf->algorithm) != NID_hmacWithSHA1)) {
 218                 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN, EVP_R_UNSUPPORTED_PRF);
 219                 goto err;
 220         }
 221
 222         if(kdf->salt->type != V_ASN1_OCTET_STRING) {
 223                 EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,
 224                                                 EVP_R_UNSUPPORTED_SALT_TYPE);
 225                 goto err;
 226         }
 227
 228         /* it seems that its all OK */
 229         salt = kdf->salt->value.octet_string->data;
 230         saltlen = kdf->salt->value.octet_string->length;
 231         iter = ASN1_INTEGER_get(kdf->iter);
 232         PKCS5_PBKDF2_HMAC_SHA1(pass, passlen, salt, saltlen, iter, keylen, key);
 233         EVP_CipherInit_ex(ctx, NULL, NULL, key, NULL, en_de);
 234         OPENSSL_cleanse(key, keylen);
 235         PBKDF2PARAM_free(kdf);
 236         return 1;
 237
 238         err:
 239         PBE2PARAM_free(pbe2);
 240         PBKDF2PARAM_free(kdf);
 241         return 0;
 242 }
 243
 244 #ifdef DEBUG_PKCS5V2
 245 static void h__dump (const unsigned char *p, int len)
 246 {
 247         for (; len --; p++) fprintf(stderr, "%02X ", *p);
 248         fprintf(stderr, "\n");
 249 }
 250 #endif
 251 #endif