crypto/pkcs12/p12_decr.c

   1 /* p12_decr.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
  59 #include <stdio.h>
  60 #include "cryptlib.h"
  61 #include <openssl/pkcs12.h>
  62
  63 /* Define this to dump decrypted output to files called DERnnn */
  64 /*#define DEBUG_DECRYPT*/
  65
  66
  67 /* Encrypt/Decrypt a buffer based on password and algor, result in a
  68  * OPENSSL_malloc'ed buffer
  69  */
  70
  71 unsigned char * PKCS12_pbe_crypt(X509_ALGOR *algor, const char *pass,
  72              int passlen, unsigned char *in, int inlen, unsigned char **data,
  73              int *datalen, int en_de)
  74 {
  75         unsigned char *out;
  76         int outlen, i;
  77         EVP_CIPHER_CTX ctx;
  78
  79         EVP_CIPHER_CTX_init(&ctx);
  80         /* Decrypt data */
  81         if (!EVP_PBE_CipherInit(algor->algorithm, pass, passlen,
  82                                          algor->parameter, &ctx, en_de)) {
  83                 PKCS12err(PKCS12_F_PKCS12_PBE_CRYPT,PKCS12_R_PKCS12_ALGOR_CIPHERINIT_ERROR);
  84                 return NULL;
  85         }
  86
  87         if(!(out = OPENSSL_malloc(inlen + EVP_CIPHER_CTX_block_size(&ctx)))) {
  88                 PKCS12err(PKCS12_F_PKCS12_PBE_CRYPT,ERR_R_MALLOC_FAILURE);
  89                 goto err;
  90         }
  91
  92         EVP_CipherUpdate(&ctx, out, &i, in, inlen);
  93         outlen = i;
  94         if(!EVP_CipherFinal_ex(&ctx, out + i, &i)) {
  95                 OPENSSL_free(out);
  96                 out = NULL;
  97                 PKCS12err(PKCS12_F_PKCS12_PBE_CRYPT,PKCS12_R_PKCS12_CIPHERFINAL_ERROR);
  98                 goto err;
  99         }
 100         outlen += i;
 101         if (datalen) *datalen = outlen;
 102         if (data) *data = out;
 103         err:
 104         EVP_CIPHER_CTX_cleanup(&ctx);
 105         return out;
 106
 107 }
 108
 109 /* Decrypt an OCTET STRING and decode ASN1 structure
 110  * if zbuf set zero buffer after use.
 111  */
 112
 113 void * PKCS12_item_decrypt_d2i(X509_ALGOR *algor, const ASN1_ITEM *it,
 114              const char *pass, int passlen, ASN1_OCTET_STRING *oct, int zbuf)
 115 {
 116         unsigned char *out;
 117         const unsigned char *p;
 118         void *ret;
 119         int outlen;
 120
 121         if (!PKCS12_pbe_crypt(algor, pass, passlen, oct->data, oct->length,
 122                                &out, &outlen, 0)) {
 123                 PKCS12err(PKCS12_F_PKCS12_ITEM_DECRYPT_D2I,PKCS12_R_PKCS12_PBE_CRYPT_ERROR);
 124                 return NULL;
 125         }
 126         p = out;
 127 #ifdef DEBUG_DECRYPT
 128         {
 129                 FILE *op;
 130
 131                 char fname[30];
 132                 static int fnm = 1;
 133                 sprintf(fname, "DER%d", fnm++);
 134                 op = fopen(fname, "wb");
 135                 fwrite (p, 1, outlen, op);
 136                 fclose(op);
 137         }
 138 #endif
 139         ret = ASN1_item_d2i(NULL, &p, outlen, it);
 140         if (zbuf) OPENSSL_cleanse(out, outlen);
 141         if(!ret) PKCS12err(PKCS12_F_PKCS12_ITEM_DECRYPT_D2I,PKCS12_R_DECODE_ERROR);
 142         OPENSSL_free(out);
 143         return ret;
 144 }
 145
 146 /* Encode ASN1 structure and encrypt, return OCTET STRING
 147  * if zbuf set zero encoding.
 148  */
 149
 150 ASN1_OCTET_STRING *PKCS12_item_i2d_encrypt(X509_ALGOR *algor, const ASN1_ITEM *it,
 151                                        const char *pass, int passlen,
 152                                        void *obj, int zbuf)
 153 {
 154         ASN1_OCTET_STRING *oct;
 155         unsigned char *in = NULL;
 156         int inlen;
 157         if (!(oct = M_ASN1_OCTET_STRING_new ())) {
 158                 PKCS12err(PKCS12_F_PKCS12_ITEM_I2D_ENCRYPT,ERR_R_MALLOC_FAILURE);
 159                 return NULL;
 160         }
 161         inlen = ASN1_item_i2d(obj, &in, it);
 162         if (!in) {
 163                 PKCS12err(PKCS12_F_PKCS12_ITEM_I2D_ENCRYPT,PKCS12_R_ENCODE_ERROR);
 164                 return NULL;
 165         }
 166         if (!PKCS12_pbe_crypt(algor, pass, passlen, in, inlen, &oct->data,
 167                                  &oct->length, 1)) {
 168                 PKCS12err(PKCS12_F_PKCS12_ITEM_I2D_ENCRYPT,PKCS12_R_ENCRYPT_ERROR);
 169                 OPENSSL_free(in);
 170                 return NULL;
 171         }
 172         if (zbuf) OPENSSL_cleanse(in, inlen);
 173         OPENSSL_free(in);
 174         return oct;
 175 }
 176
 177 IMPLEMENT_PKCS12_STACK_OF(PKCS7)