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 DECLARE_ASN1_ITEM(CMS_EncryptedData)
  67
  68 /* Return BIO based on EncryptedContentInfo and key */
  69
  70 BIO *cms_EncryptedContent_init_bio(CMS_EncryptedContentInfo *ec)
  71         {
  72         BIO *b;
  73         EVP_CIPHER_CTX *ctx;
  74         const EVP_CIPHER *ciph;
  75         X509_ALGOR *calg = ec->contentEncryptionAlgorithm;
  76         unsigned char iv[EVP_MAX_IV_LENGTH], *piv = NULL;
  77
  78         int enc;
  79
  80         enc = ec->cipher ? 1 : 0;
  81
  82         b = BIO_new(BIO_f_cipher());
  83         if (!b)
  84                 {
  85                 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
  86                                                         ERR_R_MALLOC_FAILURE);
  87                 return NULL;
  88                 }
  89
  90         BIO_get_cipher_ctx(b, &ctx);
  91
  92         if (enc)
  93                 calg->algorithm = OBJ_nid2obj(EVP_CIPHER_CTX_type(ctx));
  94         else
  95                 {
  96                 ciph = EVP_get_cipherbyobj(calg->algorithm);
  97
  98                 if (!ciph)
  99                         {
 100                         CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
 101                                                         CMS_R_UNKNOWN_CIPHER);
 102                         goto err;
 103                         }
 104                 }
 105
 106         if (EVP_CipherInit_ex(ctx, ciph, NULL, NULL, NULL, enc) <= 0)
 107                 {
 108                 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
 109                                 CMS_R_CIPHER_INITIALISATION_ERROR);
 110                 goto err;
 111                 }
 112
 113         /* If necessary set key length */
 114
 115         if (ec->keylen != EVP_CIPHER_CTX_key_length(ctx))
 116                 {
 117                 if (EVP_CIPHER_CTX_set_key_length(ctx, ec->keylen) <= 0)
 118                         {
 119                         CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
 120                                 CMS_R_INVALID_KEY_LENGTH);
 121                         goto err;
 122                         }
 123                 }
 124
 125         if (enc)
 126                 {
 127                 int ivlen;
 128                 /* Generate a random IV if we need one */
 129                 ivlen = EVP_CIPHER_CTX_iv_length(ctx);
 130                 if (ivlen > 0)
 131                         {
 132                         if (RAND_pseudo_bytes(iv, ivlen) <= 0)
 133                                 goto err;
 134                         piv = iv;
 135                         }
 136                 }
 137         else if (EVP_CIPHER_asn1_to_param(ctx, calg->parameter) <= 0)
 138                         {
 139                         CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
 140                                 CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
 141                         goto err;
 142                         }
 143
 144         if (EVP_CipherInit_ex(ctx, NULL, NULL, ec->key, piv, enc) <= 0)
 145                 {
 146                 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
 147                                 CMS_R_CIPHER_INITIALISATION_ERROR);
 148                 goto err;
 149                 }
 150
 151         if (piv)
 152                 {
 153                 calg->parameter = ASN1_TYPE_new();
 154                 if (!calg->parameter)
 155                         {
 156                         CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
 157                                                         ERR_R_MALLOC_FAILURE);
 158                         goto err;
 159                         }
 160                 if (EVP_CIPHER_param_to_asn1(ctx, calg->parameter) <= 0)
 161                         {
 162                         CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
 163                                 CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
 164                         goto err;
 165                         }
 166                 }
 167         return b;
 168
 169         err:
 170         BIO_free(b);
 171         return NULL;
 172         }
 173
 174 int cms_EncryptedContent_init(CMS_EncryptedContentInfo *ec,
 175                                 const EVP_CIPHER *cipher,
 176                                 const unsigned char *key, size_t keylen)
 177         {
 178         ec->cipher = cipher;
 179         ec->key = OPENSSL_malloc(keylen);
 180         if (!ec->key)
 181                 return 0;
 182         if (cipher)
 183                 ec->contentType = OBJ_nid2obj(NID_pkcs7_data);
 184         memcpy(ec->key, key, keylen);
 185         ec->keylen = keylen;
 186         return 1;
 187         }
 188
 189 int CMS_EncryptedData_set1_key(CMS_ContentInfo *cms, const EVP_CIPHER *ciph,
 190                                 const unsigned char *key, size_t keylen)
 191         {
 192         CMS_EncryptedContentInfo *ec;
 193         if (ciph)
 194                 {
 195                 cms->d.encryptedData = M_ASN1_new_of(CMS_EncryptedData);
 196                 if (!cms->d.encryptedData)
 197                         {
 198                         CMSerr(CMS_F_CMS_ENCRYPTEDDATA_SET1_KEY,
 199                                 ERR_R_MALLOC_FAILURE);
 200                         return 0;
 201                         }
 202                 cms->contentType = OBJ_nid2obj(NID_pkcs7_encrypted);
 203                 cms->d.encryptedData->version = 0;
 204                 }
 205         else if (OBJ_obj2nid(cms->contentType) != NID_pkcs7_encrypted)
 206                 {
 207                 CMSerr(CMS_F_CMS_ENCRYPTEDDATA_SET1_KEY,
 208                                                 CMS_R_NOT_ENCRYPTED_DATA);
 209                 return 0;
 210                 }
 211         ec = cms->d.encryptedData->encryptedContentInfo;
 212         return cms_EncryptedContent_init(ec, ciph, key, keylen);
 213         }
 214
 215 BIO *cms_EncryptedData_init_bio(CMS_ContentInfo *cms)
 216         {
 217         CMS_EncryptedContentInfo *ec;
 218         if (OBJ_obj2nid(cms->contentType) != NID_pkcs7_encrypted)
 219                 {
 220                 CMSerr(CMS_F_CMS_ENCRYPTEDDATA_INIT_BIO,
 221                                                 CMS_R_NOT_ENCRYPTED_DATA);
 222                 return NULL;
 223                 }
 224         ec = cms->d.encryptedData->encryptedContentInfo;
 225         return cms_EncryptedContent_init_bio(ec);
 226         }