crypto/evp/p5_crpt2.c

   1 /* p5_crpt2.c */
   2 /*
   3  * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
   4  * 1999.
   5  */
   6 /* ====================================================================
   7  * Copyright (c) 1999-2006 The OpenSSL Project.  All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  *
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in
  18  *    the documentation and/or other materials provided with the
  19  *    distribution.
  20  *
  21  * 3. All advertising materials mentioning features or use of this
  22  *    software must display the following acknowledgment:
  23  *    "This product includes software developed by the OpenSSL Project
  24  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  25  *
  26  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  27  *    endorse or promote products derived from this software without
  28  *    prior written permission. For written permission, please contact
  29  *    licensing@OpenSSL.org.
  30  *
  31  * 5. Products derived from this software may not be called "OpenSSL"
  32  *    nor may "OpenSSL" appear in their names without prior written
  33  *    permission of the OpenSSL Project.
  34  *
  35  * 6. Redistributions of any form whatsoever must retain the following
  36  *    acknowledgment:
  37  *    "This product includes software developed by the OpenSSL Project
  38  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  41  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  43  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  44  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  45  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  46  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  47  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  49  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  50  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  51  * OF THE POSSIBILITY OF SUCH DAMAGE.
  52  * ====================================================================
  53  *
  54  * This product includes cryptographic software written by Eric Young
  55  * (eay@cryptsoft.com).  This product includes software written by Tim
  56  * Hudson (tjh@cryptsoft.com).
  57  *
  58  */
  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 # 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 /*
  75  * This is an implementation of PKCS#5 v2.0 password based encryption key
  76  * derivation function PBKDF2. SHA1 version verified against test vectors
  77  * posted by Peter Gutmann <pgut001@cs.auckland.ac.nz> to the PKCS-TNG
  78  * <pkcs-tng@rsa.com> mailing list.
  79  */
  80
  81 int PKCS5_PBKDF2_HMAC(const char *pass, int passlen,
  82                       const unsigned char *salt, int saltlen, int iter,
  83                       const EVP_MD *digest, 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         HMAC_CTX_cleanup(&hctx_tpl);
 103         return 0;
 104     }
 105     while (tkeylen) {
 106         if (tkeylen > mdlen)
 107             cplen = mdlen;
 108         else
 109             cplen = tkeylen;
 110         /*
 111          * We are unlikely to ever use more than 256 blocks (5120 bits!) but
 112          * just in case...
 113          */
 114         itmp[0] = (unsigned char)((i >> 24) & 0xff);
 115         itmp[1] = (unsigned char)((i >> 16) & 0xff);
 116         itmp[2] = (unsigned char)((i >> 8) & 0xff);
 117         itmp[3] = (unsigned char)(i & 0xff);
 118         if (!HMAC_CTX_copy(&hctx, &hctx_tpl)) {
 119             HMAC_CTX_cleanup(&hctx_tpl);
 120             return 0;
 121         }
 122         if (!HMAC_Update(&hctx, salt, saltlen)
 123             || !HMAC_Update(&hctx, itmp, 4)
 124             || !HMAC_Final(&hctx, digtmp, NULL)) {
 125             HMAC_CTX_cleanup(&hctx_tpl);
 126             HMAC_CTX_cleanup(&hctx);
 127             return 0;
 128         }
 129         HMAC_CTX_cleanup(&hctx);
 130         memcpy(p, digtmp, cplen);
 131         for (j = 1; j < iter; j++) {
 132             if (!HMAC_CTX_copy(&hctx, &hctx_tpl)) {
 133                 HMAC_CTX_cleanup(&hctx_tpl);
 134                 return 0;
 135             }
 136             if (!HMAC_Update(&hctx, digtmp, mdlen)
 137                 || !HMAC_Final(&hctx, digtmp, NULL)) {
 138                 HMAC_CTX_cleanup(&hctx_tpl);
 139                 HMAC_CTX_cleanup(&hctx);
 140                 return 0;
 141             }
 142             HMAC_CTX_cleanup(&hctx);
 143             for (k = 0; k < cplen; k++)
 144                 p[k] ^= digtmp[k];
 145         }
 146         tkeylen -= cplen;
 147         i++;
 148         p += cplen;
 149     }
 150     HMAC_CTX_cleanup(&hctx_tpl);
 151 # ifdef DEBUG_PKCS5V2
 152     fprintf(stderr, "Password:\n");
 153     h__dump(pass, passlen);
 154     fprintf(stderr, "Salt:\n");
 155     h__dump(salt, saltlen);
 156     fprintf(stderr, "Iteration count %d\n", iter);
 157     fprintf(stderr, "Key:\n");
 158     h__dump(out, keylen);
 159 # endif
 160     return 1;
 161 }
 162
 163 int PKCS5_PBKDF2_HMAC_SHA1(const char *pass, int passlen,
 164                            const unsigned char *salt, int saltlen, int iter,
 165                            int keylen, unsigned char *out)
 166 {
 167     return PKCS5_PBKDF2_HMAC(pass, passlen, salt, saltlen, iter, EVP_sha1(),
 168                              keylen, out);
 169 }
 170
 171 # ifdef DO_TEST
 172 main()
 173 {
 174     unsigned char out[4];
 175     unsigned char salt[] = { 0x12, 0x34, 0x56, 0x78 };
 176     PKCS5_PBKDF2_HMAC_SHA1("password", -1, salt, 4, 5, 4, out);
 177     fprintf(stderr, "Out %02X %02X %02X %02X\n",
 178             out[0], out[1], out[2], out[3]);
 179 }
 180
 181 # endif
 182
 183 /*
 184  * Now the key derivation function itself. This is a bit evil because it has
 185  * to check the ASN1 parameters are valid: and there are quite a few of
 186  * them...
 187  */
 188
 189 int PKCS5_v2_PBE_keyivgen(EVP_CIPHER_CTX *ctx, const char *pass, int passlen,
 190                           ASN1_TYPE *param, const EVP_CIPHER *c,
 191                           const EVP_MD *md, int en_de)
 192 {
 193     PBE2PARAM *pbe2 = NULL;
 194     const EVP_CIPHER *cipher;
 195     EVP_PBE_KEYGEN *kdf;
 196
 197     int rv = 0;
 198
 199     pbe2 = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(PBE2PARAM), param);
 200     if (pbe2 == NULL) {
 201         EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN, EVP_R_DECODE_ERROR);
 202         goto err;
 203     }
 204
 205     /* See if we recognise the key derivation function */
 206     if (!EVP_PBE_find(EVP_PBE_TYPE_KDF, OBJ_obj2nid(pbe2->keyfunc->algorithm),
 207                         NULL, NULL, &kdf)) {
 208         EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN,
 209                EVP_R_UNSUPPORTED_KEY_DERIVATION_FUNCTION);
 210         goto err;
 211     }
 212
 213     /*
 214      * lets see if we recognise the encryption algorithm.
 215      */
 216
 217     cipher = EVP_get_cipherbyobj(pbe2->encryption->algorithm);
 218
 219     if (!cipher) {
 220         EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN, EVP_R_UNSUPPORTED_CIPHER);
 221         goto err;
 222     }
 223
 224     /* Fixup cipher based on AlgorithmIdentifier */
 225     if (!EVP_CipherInit_ex(ctx, cipher, NULL, NULL, NULL, en_de))
 226         goto err;
 227     if (EVP_CIPHER_asn1_to_param(ctx, pbe2->encryption->parameter) < 0) {
 228         EVPerr(EVP_F_PKCS5_V2_PBE_KEYIVGEN, EVP_R_CIPHER_PARAMETER_ERROR);
 229         goto err;
 230     }
 231     rv = kdf(ctx, pass, passlen, pbe2->keyfunc->parameter, NULL, NULL, en_de);
 232  err:
 233     PBE2PARAM_free(pbe2);
 234     return rv;
 235 }
 236
 237 int PKCS5_v2_PBKDF2_keyivgen(EVP_CIPHER_CTX *ctx, const char *pass,
 238                              int passlen, ASN1_TYPE *param,
 239                              const EVP_CIPHER *c, const EVP_MD *md, int en_de)
 240 {
 241     unsigned char *salt, key[EVP_MAX_KEY_LENGTH];
 242     int saltlen, iter;
 243     int rv = 0;
 244     unsigned int keylen = 0;
 245     int prf_nid, hmac_md_nid;
 246     PBKDF2PARAM *kdf = NULL;
 247     const EVP_MD *prfmd;
 248
 249     if (EVP_CIPHER_CTX_cipher(ctx) == NULL) {
 250         EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_NO_CIPHER_SET);
 251         goto err;
 252     }
 253     keylen = EVP_CIPHER_CTX_key_length(ctx);
 254     OPENSSL_assert(keylen <= sizeof key);
 255
 256     /* Decode parameter */
 257
 258     kdf = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(PBKDF2PARAM), param);
 259
 260     if (kdf == NULL) {
 261         EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_DECODE_ERROR);
 262         goto err;
 263     }
 264
 265     keylen = EVP_CIPHER_CTX_key_length(ctx);
 266
 267     /* Now check the parameters of the kdf */
 268
 269     if (kdf->keylength && (ASN1_INTEGER_get(kdf->keylength) != (int)keylen)) {
 270         EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_UNSUPPORTED_KEYLENGTH);
 271         goto err;
 272     }
 273
 274     if (kdf->prf)
 275         prf_nid = OBJ_obj2nid(kdf->prf->algorithm);
 276     else
 277         prf_nid = NID_hmacWithSHA1;
 278
 279     if (!EVP_PBE_find(EVP_PBE_TYPE_PRF, prf_nid, NULL, &hmac_md_nid, 0)) {
 280         EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_UNSUPPORTED_PRF);
 281         goto err;
 282     }
 283
 284     prfmd = EVP_get_digestbynid(hmac_md_nid);
 285     if (prfmd == NULL) {
 286         EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_UNSUPPORTED_PRF);
 287         goto err;
 288     }
 289
 290     if (kdf->salt->type != V_ASN1_OCTET_STRING) {
 291         EVPerr(EVP_F_PKCS5_V2_PBKDF2_KEYIVGEN, EVP_R_UNSUPPORTED_SALT_TYPE);
 292         goto err;
 293     }
 294
 295     /* it seems that its all OK */
 296     salt = kdf->salt->value.octet_string->data;
 297     saltlen = kdf->salt->value.octet_string->length;
 298     iter = ASN1_INTEGER_get(kdf->iter);
 299     if (!PKCS5_PBKDF2_HMAC(pass, passlen, salt, saltlen, iter, prfmd,
 300                            keylen, key))
 301         goto err;
 302     rv = EVP_CipherInit_ex(ctx, NULL, NULL, key, NULL, en_de);
 303  err:
 304     OPENSSL_cleanse(key, keylen);
 305     PBKDF2PARAM_free(kdf);
 306     return rv;
 307 }
 308
 309 # ifdef DEBUG_PKCS5V2
 310 static void h__dump(const unsigned char *p, int len)
 311 {
 312     for (; len--; p++)
 313         fprintf(stderr, "%02X ", *p);
 314     fprintf(stderr, "\n");
 315 }
 316 # endif