crypto/evp/p5_crpt.c

   1 /*
   2  * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
   3  * 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 "internal/cryptlib.h"
  62 #include <openssl/x509.h>
  63 #include <openssl/evp.h>
  64
  65 /*
  66  * Doesn't do anything now: Builtin PBE algorithms in static table.
  67  */
  68
  69 void PKCS5_PBE_add(void)
  70 {
  71 }
  72
  73 int PKCS5_PBE_keyivgen(EVP_CIPHER_CTX *cctx, const char *pass, int passlen,
  74                        ASN1_TYPE *param, const EVP_CIPHER *cipher,
  75                        const EVP_MD *md, int en_de)
  76 {
  77     EVP_MD_CTX *ctx;
  78     unsigned char md_tmp[EVP_MAX_MD_SIZE];
  79     unsigned char key[EVP_MAX_KEY_LENGTH], iv[EVP_MAX_IV_LENGTH];
  80     int i;
  81     PBEPARAM *pbe;
  82     int saltlen, iter;
  83     unsigned char *salt;
  84     int mdsize;
  85     int rv = 0;
  86
  87     /* Extract useful info from parameter */
  88     if (param == NULL || param->type != V_ASN1_SEQUENCE ||
  89         param->value.sequence == NULL) {
  90         EVPerr(EVP_F_PKCS5_PBE_KEYIVGEN, EVP_R_DECODE_ERROR);
  91         return 0;
  92     }
  93
  94     pbe = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(PBEPARAM), param);
  95     if (pbe == NULL) {
  96         EVPerr(EVP_F_PKCS5_PBE_KEYIVGEN, EVP_R_DECODE_ERROR);
  97         return 0;
  98     }
  99
 100     if (!pbe->iter)
 101         iter = 1;
 102     else
 103         iter = ASN1_INTEGER_get(pbe->iter);
 104     salt = pbe->salt->data;
 105     saltlen = pbe->salt->length;
 106
 107     if (!pass)
 108         passlen = 0;
 109     else if (passlen == -1)
 110         passlen = strlen(pass);
 111
 112     ctx = EVP_MD_CTX_new();
 113     if (ctx == NULL) {
 114         EVPerr(EVP_F_PKCS5_PBE_KEYIVGEN, ERR_R_MALLOC_FAILURE);
 115         goto err;
 116     }
 117
 118     if (!EVP_DigestInit_ex(ctx, md, NULL))
 119         goto err;
 120     if (!EVP_DigestUpdate(ctx, pass, passlen))
 121         goto err;
 122     if (!EVP_DigestUpdate(ctx, salt, saltlen))
 123         goto err;
 124     PBEPARAM_free(pbe);
 125     if (!EVP_DigestFinal_ex(ctx, md_tmp, NULL))
 126         goto err;
 127     mdsize = EVP_MD_size(md);
 128     if (mdsize < 0)
 129         return 0;
 130     for (i = 1; i < iter; i++) {
 131         if (!EVP_DigestInit_ex(ctx, md, NULL))
 132             goto err;
 133         if (!EVP_DigestUpdate(ctx, md_tmp, mdsize))
 134             goto err;
 135         if (!EVP_DigestFinal_ex(ctx, md_tmp, NULL))
 136             goto err;
 137     }
 138     OPENSSL_assert(EVP_CIPHER_key_length(cipher) <= (int)sizeof(md_tmp));
 139     memcpy(key, md_tmp, EVP_CIPHER_key_length(cipher));
 140     OPENSSL_assert(EVP_CIPHER_iv_length(cipher) <= 16);
 141     memcpy(iv, md_tmp + (16 - EVP_CIPHER_iv_length(cipher)),
 142            EVP_CIPHER_iv_length(cipher));
 143     if (!EVP_CipherInit_ex(cctx, cipher, NULL, key, iv, en_de))
 144         goto err;
 145     OPENSSL_cleanse(md_tmp, EVP_MAX_MD_SIZE);
 146     OPENSSL_cleanse(key, EVP_MAX_KEY_LENGTH);
 147     OPENSSL_cleanse(iv, EVP_MAX_IV_LENGTH);
 148     rv = 1;
 149  err:
 150     EVP_MD_CTX_free(ctx);
 151     return rv;
 152 }