crypto/openssl-0.9/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
  63 /* CMS EncryptedData Utilities */
  64
  65 DECLARE_ASN1_ITEM(CMS_EncryptedData)
  66
  67 /* Return BIO based on EncryptedContentInfo and key */
  68
  69 BIO *cms_EncryptedContent_init_bio(CMS_EncryptedContentInfo *ec)
  70         {
  71         BIO *b;
  72         EVP_CIPHER_CTX *ctx;
  73         const EVP_CIPHER *ciph;
  74         X509_ALGOR *calg = ec->contentEncryptionAlgorithm;
  75         unsigned char iv[EVP_MAX_IV_LENGTH], *piv = NULL;
  76
  77         int ok = 0;
  78
  79         int enc, keep_key = 0;
  80
  81         enc = ec->cipher ? 1 : 0;
  82
  83         b = BIO_new(BIO_f_cipher());
  84         if (!b)
  85                 {
  86                 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
  87                                                         ERR_R_MALLOC_FAILURE);
  88                 return NULL;
  89                 }
  90
  91         BIO_get_cipher_ctx(b, &ctx);
  92
  93         if (enc)
  94                 {
  95                 ciph = ec->cipher;
  96                 /* If not keeping key set cipher to NULL so subsequent calls
  97                  * decrypt.
  98                  */
  99                 if (ec->key)
 100                         ec->cipher = NULL;
 101                 }
 102         else
 103                 {
 104                 ciph = EVP_get_cipherbyobj(calg->algorithm);
 105
 106                 if (!ciph)
 107                         {
 108                         CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
 109                                                         CMS_R_UNKNOWN_CIPHER);
 110                         goto err;
 111                         }
 112                 }
 113
 114         if (EVP_CipherInit_ex(ctx, ciph, NULL, NULL, NULL, enc) <= 0)
 115                 {
 116                 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
 117                                 CMS_R_CIPHER_INITIALISATION_ERROR);
 118                 goto err;
 119                 }
 120
 121         if (enc)
 122                 {
 123                 int ivlen;
 124                 calg->algorithm = OBJ_nid2obj(EVP_CIPHER_CTX_type(ctx));
 125                 /* Generate a random IV if we need one */
 126                 ivlen = EVP_CIPHER_CTX_iv_length(ctx);
 127                 if (ivlen > 0)
 128                         {
 129                         if (RAND_pseudo_bytes(iv, ivlen) <= 0)
 130                                 goto err;
 131                         piv = iv;
 132                         }
 133                 }
 134         else if (EVP_CIPHER_asn1_to_param(ctx, calg->parameter) <= 0)
 135                 {
 136                 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
 137                                 CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
 138                 goto err;
 139                 }
 140
 141
 142         if (enc && !ec->key)
 143                 {
 144                 /* Generate random key */
 145                 if (!ec->keylen)
 146                         ec->keylen = EVP_CIPHER_CTX_key_length(ctx);
 147                 ec->key = OPENSSL_malloc(ec->keylen);
 148                 if (!ec->key)
 149                         {
 150                         CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
 151                                                         ERR_R_MALLOC_FAILURE);
 152                         goto err;
 153                         }
 154                 if (EVP_CIPHER_CTX_rand_key(ctx, ec->key) <= 0)
 155                         goto err;
 156                 keep_key = 1;
 157                 }
 158         else if (ec->keylen != (unsigned int)EVP_CIPHER_CTX_key_length(ctx))
 159                 {
 160                 /* If necessary set key length */
 161                 if (EVP_CIPHER_CTX_set_key_length(ctx, ec->keylen) <= 0)
 162                         {
 163                         CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
 164                                 CMS_R_INVALID_KEY_LENGTH);
 165                         goto err;
 166                         }
 167                 }
 168
 169         if (EVP_CipherInit_ex(ctx, NULL, NULL, ec->key, piv, enc) <= 0)
 170                 {
 171                 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
 172                                 CMS_R_CIPHER_INITIALISATION_ERROR);
 173                 goto err;
 174                 }
 175
 176         if (piv)
 177                 {
 178                 calg->parameter = ASN1_TYPE_new();
 179                 if (!calg->parameter)
 180                         {
 181                         CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
 182                                                         ERR_R_MALLOC_FAILURE);
 183                         goto err;
 184                         }
 185                 if (EVP_CIPHER_param_to_asn1(ctx, calg->parameter) <= 0)
 186                         {
 187                         CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
 188                                 CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
 189                         goto err;
 190                         }
 191                 }
 192         ok = 1;
 193
 194         err:
 195         if (ec->key && !keep_key)
 196                 {
 197                 OPENSSL_cleanse(ec->key, ec->keylen);
 198                 OPENSSL_free(ec->key);
 199                 ec->key = NULL;
 200                 }
 201         if (ok)
 202                 return b;
 203         BIO_free(b);
 204         return NULL;
 205         }
 206
 207 int cms_EncryptedContent_init(CMS_EncryptedContentInfo *ec,
 208                                 const EVP_CIPHER *cipher,
 209                                 const unsigned char *key, size_t keylen)
 210         {
 211         ec->cipher = cipher;
 212         if (key)
 213                 {
 214                 ec->key = OPENSSL_malloc(keylen);
 215                 if (!ec->key)
 216                         return 0;
 217                 memcpy(ec->key, key, keylen);
 218                 }
 219         ec->keylen = keylen;
 220         if (cipher)
 221                 ec->contentType = OBJ_nid2obj(NID_pkcs7_data);
 222         return 1;
 223         }
 224
 225 int CMS_EncryptedData_set1_key(CMS_ContentInfo *cms, const EVP_CIPHER *ciph,
 226                                 const unsigned char *key, size_t keylen)
 227         {
 228         CMS_EncryptedContentInfo *ec;
 229         if (!key || !keylen)
 230                 {
 231                 CMSerr(CMS_F_CMS_ENCRYPTEDDATA_SET1_KEY, CMS_R_NO_KEY);
 232                 return 0;
 233                 }
 234         if (ciph)
 235                 {
 236                 cms->d.encryptedData = M_ASN1_new_of(CMS_EncryptedData);
 237                 if (!cms->d.encryptedData)
 238                         {
 239                         CMSerr(CMS_F_CMS_ENCRYPTEDDATA_SET1_KEY,
 240                                 ERR_R_MALLOC_FAILURE);
 241                         return 0;
 242                         }
 243                 cms->contentType = OBJ_nid2obj(NID_pkcs7_encrypted);
 244                 cms->d.encryptedData->version = 0;
 245                 }
 246         else if (OBJ_obj2nid(cms->contentType) != NID_pkcs7_encrypted)
 247                 {
 248                 CMSerr(CMS_F_CMS_ENCRYPTEDDATA_SET1_KEY,
 249                                                 CMS_R_NOT_ENCRYPTED_DATA);
 250                 return 0;
 251                 }
 252         ec = cms->d.encryptedData->encryptedContentInfo;
 253         return cms_EncryptedContent_init(ec, ciph, key, keylen);
 254         }
 255
 256 BIO *cms_EncryptedData_init_bio(CMS_ContentInfo *cms)
 257         {
 258         CMS_EncryptedData *enc = cms->d.encryptedData;
 259         if (enc->encryptedContentInfo->cipher && enc->unprotectedAttrs)
 260                 enc->version = 2;
 261         return cms_EncryptedContent_init_bio(enc->encryptedContentInfo);
 262         }