crypto/pkcs12/p12_decr.c

   1 /* p12_decr.c */
   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 "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,
  73                                  unsigned char **data, size_t *datalen,
  74                                  int en_de)
  75 {
  76         unsigned char *out;
  77         int outlen, i;
  78         EVP_CIPHER_CTX ctx;
  79
  80         EVP_CIPHER_CTX_init(&ctx);
  81         /* Decrypt data */
  82         if (!EVP_PBE_CipherInit(algor->algorithm, pass, passlen,
  83                                          algor->parameter, &ctx, en_de)) {
  84                 PKCS12err(PKCS12_F_PKCS12_PBE_CRYPT,PKCS12_R_PKCS12_ALGOR_CIPHERINIT_ERROR);
  85                 return NULL;
  86         }
  87
  88         if(!(out = OPENSSL_malloc(inlen + EVP_CIPHER_CTX_block_size(&ctx)))) {
  89                 PKCS12err(PKCS12_F_PKCS12_PBE_CRYPT,ERR_R_MALLOC_FAILURE);
  90                 goto err;
  91         }
  92
  93         EVP_CipherUpdate(&ctx, out, &i, in, inlen);
  94         outlen = i;
  95         if(!EVP_CipherFinal_ex(&ctx, out + i, &i)) {
  96                 OPENSSL_free(out);
  97                 out = NULL;
  98                 PKCS12err(PKCS12_F_PKCS12_PBE_CRYPT,PKCS12_R_PKCS12_CIPHERFINAL_ERROR);
  99                 goto err;
 100         }
 101         outlen += i;
 102         if (datalen) *datalen = outlen;
 103         if (data) *data = out;
 104         err:
 105         EVP_CIPHER_CTX_cleanup(&ctx);
 106         return out;
 107
 108 }
 109
 110 /* Decrypt an OCTET STRING and decode ASN1 structure
 111  * if zbuf set zero buffer after use.
 112  */
 113
 114 void * PKCS12_item_decrypt_d2i(X509_ALGOR *algor, const ASN1_ITEM *it,
 115                                const char *pass, int passlen,
 116                                ASN1_OCTET_STRING *oct, int zbuf)
 117 {
 118         unsigned char *out;
 119         const unsigned char *p;
 120         void *ret;
 121         size_t outlen;
 122
 123         if (!PKCS12_pbe_crypt(algor, pass, passlen, oct->data, oct->length,
 124                                &out, &outlen, 0)) {
 125                 PKCS12err(PKCS12_F_PKCS12_ITEM_DECRYPT_D2I,PKCS12_R_PKCS12_PBE_CRYPT_ERROR);
 126                 return NULL;
 127         }
 128         p = out;
 129 #ifdef DEBUG_DECRYPT
 130         {
 131                 FILE *op;
 132
 133                 char fname[30];
 134                 static int fnm = 1;
 135                 sprintf(fname, "DER%d", fnm++);
 136                 op = fopen(fname, "wb");
 137                 fwrite (p, 1, outlen, op);
 138                 fclose(op);
 139         }
 140 #endif
 141         ret = ASN1_item_d2i(NULL, &p, outlen, it);
 142         if (zbuf) OPENSSL_cleanse(out, outlen);
 143         if(!ret) PKCS12err(PKCS12_F_PKCS12_ITEM_DECRYPT_D2I,PKCS12_R_DECODE_ERROR);
 144         OPENSSL_free(out);
 145         return ret;
 146 }
 147
 148 /* Encode ASN1 structure and encrypt, return OCTET STRING
 149  * if zbuf set zero encoding.
 150  */
 151
 152 ASN1_OCTET_STRING *PKCS12_item_i2d_encrypt(X509_ALGOR *algor,
 153                                            const ASN1_ITEM *it,
 154                                            const char *pass, int passlen,
 155                                            void *obj, int zbuf)
 156 {
 157         ASN1_OCTET_STRING *oct;
 158         unsigned char *in = NULL;
 159         int inlen;
 160         if (!(oct = M_ASN1_OCTET_STRING_new ())) {
 161                 PKCS12err(PKCS12_F_PKCS12_ITEM_I2D_ENCRYPT,ERR_R_MALLOC_FAILURE);
 162                 return NULL;
 163         }
 164         inlen = ASN1_item_i2d(obj, &in, it);
 165         if (!in) {
 166                 PKCS12err(PKCS12_F_PKCS12_ITEM_I2D_ENCRYPT,PKCS12_R_ENCODE_ERROR);
 167                 return NULL;
 168         }
 169         if (!PKCS12_pbe_crypt(algor, pass, passlen, in, inlen, &oct->data,
 170                               &oct->length, 1)) {
 171                 PKCS12err(PKCS12_F_PKCS12_ITEM_I2D_ENCRYPT,PKCS12_R_ENCRYPT_ERROR);
 172                 OPENSSL_free(in);
 173                 return NULL;
 174         }
 175         if (zbuf) OPENSSL_cleanse(in, inlen);
 176         OPENSSL_free(in);
 177         return oct;
 178 }
 179
 180 IMPLEMENT_PKCS12_STACK_OF(PKCS7)