lib/libcrypto/evp/p5_crpt.c

   1 /* $OpenBSD: p5_crpt.c,v 1.18 2017/01/29 17:49:23 beck Exp $ */
   2 /* Written by Dr Stephen N Henson (steve@openssl.org) 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
  59 #include <stdio.h>
  60 #include <stdlib.h>
  61 #include <string.h>
  62
  63 #include <openssl/err.h>
  64 #include <openssl/evp.h>
  65 #include <openssl/x509.h>
  66
  67 /* Doesn't do anything now: Builtin PBE algorithms in static table.
  68  */
  69
  70 void
  71 PKCS5_PBE_add(void)
  72 {
  73 }
  74
  75 int
  76 PKCS5_PBE_keyivgen(EVP_CIPHER_CTX *cctx, const char *pass, int passlen,
  77     ASN1_TYPE *param, const EVP_CIPHER *cipher, const EVP_MD *md, int en_de)
  78 {
  79         EVP_MD_CTX ctx;
  80         unsigned char md_tmp[EVP_MAX_MD_SIZE];
  81         unsigned char key[EVP_MAX_KEY_LENGTH], iv[EVP_MAX_IV_LENGTH];
  82         int i;
  83         PBEPARAM *pbe;
  84         int saltlen, iter;
  85         unsigned char *salt;
  86         const unsigned char *pbuf;
  87         int mdsize;
  88         int rv = 0;
  89
  90         /* Extract useful info from parameter */
  91         if (param == NULL || param->type != V_ASN1_SEQUENCE ||
  92             param->value.sequence == NULL) {
  93                 EVPerror(EVP_R_DECODE_ERROR);
  94                 return 0;
  95         }
  96
  97         mdsize = EVP_MD_size(md);
  98         if (mdsize < 0)
  99                 return 0;
 100
 101         pbuf = param->value.sequence->data;
 102         if (!(pbe = d2i_PBEPARAM(NULL, &pbuf, param->value.sequence->length))) {
 103                 EVPerror(EVP_R_DECODE_ERROR);
 104                 return 0;
 105         }
 106
 107         if (!pbe->iter)
 108                 iter = 1;
 109         else if ((iter = ASN1_INTEGER_get(pbe->iter)) <= 0) {
 110                 EVPerror(EVP_R_UNSUPORTED_NUMBER_OF_ROUNDS);
 111                 return 0;
 112         }
 113         salt = pbe->salt->data;
 114         saltlen = pbe->salt->length;
 115
 116         if (!pass)
 117                 passlen = 0;
 118         else if (passlen == -1)
 119                 passlen = strlen(pass);
 120
 121         EVP_MD_CTX_init(&ctx);
 122
 123         if (!EVP_DigestInit_ex(&ctx, md, NULL))
 124                 goto err;
 125         if (!EVP_DigestUpdate(&ctx, pass, passlen))
 126                 goto err;
 127         if (!EVP_DigestUpdate(&ctx, salt, saltlen))
 128                 goto err;
 129         if (!EVP_DigestFinal_ex(&ctx, md_tmp, NULL))
 130                 goto err;
 131         for (i = 1; i < iter; i++) {
 132                 if (!EVP_DigestInit_ex(&ctx, md, NULL))
 133                         goto err;
 134                 if (!EVP_DigestUpdate(&ctx, md_tmp, mdsize))
 135                         goto err;
 136                 if (!EVP_DigestFinal_ex (&ctx, md_tmp, NULL))
 137                         goto err;
 138         }
 139         if ((size_t)EVP_CIPHER_key_length(cipher) > sizeof(md_tmp)) {
 140                 EVPerror(EVP_R_BAD_KEY_LENGTH);
 141                 goto err;
 142         }
 143         memcpy(key, md_tmp, EVP_CIPHER_key_length(cipher));
 144         if ((size_t)EVP_CIPHER_iv_length(cipher) > 16) {
 145                 EVPerror(EVP_R_IV_TOO_LARGE);
 146                 goto err;
 147         }
 148         memcpy(iv, md_tmp + (16 - EVP_CIPHER_iv_length(cipher)),
 149             EVP_CIPHER_iv_length(cipher));
 150         if (!EVP_CipherInit_ex(cctx, cipher, NULL, key, iv, en_de))
 151                 goto err;
 152         explicit_bzero(md_tmp, EVP_MAX_MD_SIZE);
 153         explicit_bzero(key, EVP_MAX_KEY_LENGTH);
 154         explicit_bzero(iv, EVP_MAX_IV_LENGTH);
 155         rv = 1;
 156 err:
 157         EVP_MD_CTX_cleanup(&ctx);
 158         PBEPARAM_free(pbe);
 159         return rv;
 160 }