crypto/cms/cms_enc.c

   1 /* crypto/cms/cms_enc.c */
   2 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
   3  * project.
   4  */
   5 /* ====================================================================
   6  * Copyright (c) 2008 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
  54 #include "cryptlib.h"
  55 #include <openssl/asn1t.h>
  56 #include <openssl/pem.h>
  57 #include <openssl/x509v3.h>
  58 #include <openssl/err.h>
  59 #include <openssl/cms.h>
  60 #include <openssl/rand.h>
  61 #include "cms_lcl.h"
  62 #include "asn1_locl.h"
  63
  64 /* CMS EncryptedData Utilities */
  65
  66 /* Set up EncryptedContentInfo based on supplied cipher bio */
  67
  68 int cms_bio_to_EncryptedContent(CMS_EncryptedContentInfo *ec,
  69                                         const unsigned char *key, int keylen,
  70                                         BIO *b)
  71         {
  72         EVP_CIPHER_CTX *ctx = NULL;
  73         unsigned char iv[EVP_MAX_IV_LENGTH], *piv;
  74         int ivlen;
  75
  76         BIO_get_cipher_ctx(b, &ctx);
  77
  78         /* If necessary set key length */
  79
  80         if (keylen != EVP_CIPHER_CTX_key_length(ctx))
  81                 {
  82                 if (EVP_CIPHER_CTX_set_key_length(ctx, keylen) <= 0)
  83                         {
  84                         CMSerr(CMS_F_CMS_BIO_TO_ENCRYPTEDCONTENT,
  85                                 CMS_R_INVALID_KEY_LENGTH);
  86                         return 0;
  87                         }
  88                 }
  89
  90         /* Generate a random IV if we need one */
  91
  92         ivlen = EVP_CIPHER_CTX_iv_length(ctx);
  93         if (ivlen > 0)
  94                 {
  95                 if (RAND_pseudo_bytes(iv, ivlen) <= 0)
  96                         return 0;
  97                 piv = iv;
  98                 }
  99         else
 100                 piv = NULL;
 101
 102         if (EVP_CipherInit_ex(ctx, NULL, NULL, key, piv, 1) <= 0)
 103                 {
 104                 CMSerr(CMS_F_CMS_BIO_TO_ENCRYPTEDCONTENT,
 105                                 CMS_R_CIPHER_INITIALISATION_ERROR);
 106                 return 0;
 107                 }
 108
 109         ec->contentEncryptionAlgorithm->algorithm =
 110                         OBJ_nid2obj(EVP_CIPHER_CTX_type(ctx));
 111
 112         if (piv)
 113                 {
 114                 ec->contentEncryptionAlgorithm->parameter = ASN1_TYPE_new();
 115                 if (!ec->contentEncryptionAlgorithm->parameter)
 116                         {
 117                         CMSerr(CMS_F_CMS_BIO_TO_ENCRYPTEDCONTENT,
 118                                                         ERR_R_MALLOC_FAILURE);
 119                         return 0;
 120                         }
 121                 if (EVP_CIPHER_param_to_asn1(ctx,
 122                         ec->contentEncryptionAlgorithm->parameter) <= 0)
 123                         {
 124                         CMSerr(CMS_F_CMS_BIO_TO_ENCRYPTEDCONTENT,
 125                                 CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
 126                         return 0;
 127                         }
 128                 }
 129
 130         return 1;
 131         }
 132
 133 /* Return BIO based on EncryptedContentInfo and key */
 134
 135 BIO *cms_EncryptedContent_to_bio(CMS_EncryptedContentInfo *ec,
 136                                         const unsigned char *key, int keylen)
 137         {
 138         BIO *b;
 139         EVP_CIPHER_CTX *ctx;
 140         const EVP_CIPHER *ciph;
 141         b = BIO_new(BIO_f_cipher());
 142         if (!b)
 143                 {
 144                 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_TO_BIO, ERR_R_MALLOC_FAILURE);
 145                 return NULL;
 146                 }
 147         BIO_get_cipher_ctx(b, &ctx);
 148
 149         ciph = EVP_get_cipherbyobj(ec->contentEncryptionAlgorithm->algorithm);
 150
 151         if (!ciph)
 152                 {
 153                 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_TO_BIO, CMS_R_UNKNOWN_CIPHER);
 154                 goto err;
 155                 }
 156
 157         if (EVP_CipherInit_ex(ctx, ciph, NULL, NULL, NULL, 0) <= 0)
 158                 {
 159                 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_TO_BIO,
 160                                 CMS_R_CIPHER_INITIALISATION_ERROR);
 161                 goto err;
 162                 }
 163
 164         /* If necessary set key length */
 165
 166         if (keylen != EVP_CIPHER_CTX_key_length(ctx))
 167                 {
 168                 if (EVP_CIPHER_CTX_set_key_length(ctx, keylen) <= 0)
 169                         {
 170                         CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_TO_BIO,
 171                                 CMS_R_INVALID_KEY_LENGTH);
 172                         goto err;
 173                         }
 174                 }
 175
 176         if (EVP_CipherInit_ex(ctx, NULL, NULL, key, NULL, 0) <= 0)
 177                 {
 178                 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_TO_BIO,
 179                                 CMS_R_CIPHER_INITIALISATION_ERROR);
 180                 goto err;
 181                 }
 182
 183         if (EVP_CIPHER_asn1_to_param(ctx,
 184                         ec->contentEncryptionAlgorithm->parameter) <= 0)
 185                         {
 186                         CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_TO_BIO,
 187                                 CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
 188                         goto err;
 189                         }
 190         return b;
 191
 192         err:
 193         BIO_free(b);
 194         return NULL;
 195         }
 196