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 ok = 0;
  79
  80         int enc, keep_key = 0;
  81
  82         enc = ec->cipher ? 1 : 0;
  83
  84         b = BIO_new(BIO_f_cipher());
  85         if (!b)
  86                 {
  87                 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
  88                                                         ERR_R_MALLOC_FAILURE);
  89                 return NULL;
  90                 }
  91
  92         BIO_get_cipher_ctx(b, &ctx);
  93
  94         if (enc)
  95                 {
  96                 ciph = ec->cipher;
  97                 /* If not keeping key set cipher to NULL so subsequent calls
  98                  * decrypt.
  99                  */
 100                 if (ec->key)
 101                         ec->cipher = NULL;
 102                 }
 103         else
 104                 {
 105                 ciph = EVP_get_cipherbyobj(calg->algorithm);
 106
 107                 if (!ciph)
 108                         {
 109                         CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
 110                                                         CMS_R_UNKNOWN_CIPHER);
 111                         goto err;
 112                         }
 113                 }
 114
 115         if (EVP_CipherInit_ex(ctx, ciph, NULL, NULL, NULL, enc) <= 0)
 116                 {
 117                 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
 118                                 CMS_R_CIPHER_INITIALISATION_ERROR);
 119                 goto err;
 120                 }
 121
 122         if (enc)
 123                 {
 124                 int ivlen;
 125                 calg->algorithm = OBJ_nid2obj(EVP_CIPHER_CTX_type(ctx));
 126                 /* Generate a random IV if we need one */
 127                 ivlen = EVP_CIPHER_CTX_iv_length(ctx);
 128                 if (ivlen > 0)
 129                         {
 130                         if (RAND_pseudo_bytes(iv, ivlen) <= 0)
 131                                 goto err;
 132                         piv = iv;
 133                         }
 134                 }
 135         else if (EVP_CIPHER_asn1_to_param(ctx, calg->parameter) <= 0)
 136                 {
 137                 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
 138                                 CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
 139                 goto err;
 140                 }
 141
 142
 143         if (enc && !ec->key)
 144                 {
 145                 /* Generate random key */
 146                 if (!ec->keylen)
 147                         ec->keylen = EVP_CIPHER_CTX_key_length(ctx);
 148                 ec->key = OPENSSL_malloc(ec->keylen);
 149                 if (!ec->key)
 150                         {
 151                         CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
 152                                                         ERR_R_MALLOC_FAILURE);
 153                         goto err;
 154                         }
 155                 if (EVP_CIPHER_CTX_rand_key(ctx, ec->key) <= 0)
 156                         goto err;
 157                 keep_key = 1;
 158                 }
 159         else if (ec->keylen != (unsigned int)EVP_CIPHER_CTX_key_length(ctx))
 160                 {
 161                 /* If necessary set key length */
 162                 if (EVP_CIPHER_CTX_set_key_length(ctx, ec->keylen) <= 0)
 163                         {
 164                         CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
 165                                 CMS_R_INVALID_KEY_LENGTH);
 166                         goto err;
 167                         }
 168                 }
 169
 170         if (EVP_CipherInit_ex(ctx, NULL, NULL, ec->key, piv, enc) <= 0)
 171                 {
 172                 CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
 173                                 CMS_R_CIPHER_INITIALISATION_ERROR);
 174                 goto err;
 175                 }
 176
 177         if (piv)
 178                 {
 179                 calg->parameter = ASN1_TYPE_new();
 180                 if (!calg->parameter)
 181                         {
 182                         CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
 183                                                         ERR_R_MALLOC_FAILURE);
 184                         goto err;
 185                         }
 186                 if (EVP_CIPHER_param_to_asn1(ctx, calg->parameter) <= 0)
 187                         {
 188                         CMSerr(CMS_F_CMS_ENCRYPTEDCONTENT_INIT_BIO,
 189                                 CMS_R_CIPHER_PARAMETER_INITIALISATION_ERROR);
 190                         goto err;
 191                         }
 192                 }
 193         ok = 1;
 194
 195         err:
 196         if (ec->key && !keep_key)
 197                 {
 198                 OPENSSL_cleanse(ec->key, ec->keylen);
 199                 OPENSSL_free(ec->key);
 200                 ec->key = NULL;
 201                 }
 202         if (ok)
 203                 return b;
 204         BIO_free(b);
 205         return NULL;
 206         }
 207
 208 int cms_EncryptedContent_init(CMS_EncryptedContentInfo *ec,
 209                                 const EVP_CIPHER *cipher,
 210                                 const unsigned char *key, size_t keylen)
 211         {
 212         ec->cipher = cipher;
 213         if (key)
 214                 {
 215                 ec->key = OPENSSL_malloc(keylen);
 216                 if (!ec->key)
 217                         return 0;
 218                 memcpy(ec->key, key, keylen);
 219                 }
 220         ec->keylen = keylen;
 221         if (cipher)
 222                 ec->contentType = OBJ_nid2obj(NID_pkcs7_data);
 223         return 1;
 224         }
 225
 226 int CMS_EncryptedData_set1_key(CMS_ContentInfo *cms, const EVP_CIPHER *ciph,
 227                                 const unsigned char *key, size_t keylen)
 228         {
 229         CMS_EncryptedContentInfo *ec;
 230         if (!key || !keylen)
 231                 {
 232                 CMSerr(CMS_F_CMS_ENCRYPTEDDATA_SET1_KEY, CMS_R_NO_KEY);
 233                 return 0;
 234                 }
 235         if (ciph)
 236                 {
 237                 cms->d.encryptedData = M_ASN1_new_of(CMS_EncryptedData);
 238                 if (!cms->d.encryptedData)
 239                         {
 240                         CMSerr(CMS_F_CMS_ENCRYPTEDDATA_SET1_KEY,
 241                                 ERR_R_MALLOC_FAILURE);
 242                         return 0;
 243                         }
 244                 cms->contentType = OBJ_nid2obj(NID_pkcs7_encrypted);
 245                 cms->d.encryptedData->version = 0;
 246                 }
 247         else if (OBJ_obj2nid(cms->contentType) != NID_pkcs7_encrypted)
 248                 {
 249                 CMSerr(CMS_F_CMS_ENCRYPTEDDATA_SET1_KEY,
 250                                                 CMS_R_NOT_ENCRYPTED_DATA);
 251                 return 0;
 252                 }
 253         ec = cms->d.encryptedData->encryptedContentInfo;
 254         return cms_EncryptedContent_init(ec, ciph, key, keylen);
 255         }
 256
 257 BIO *cms_EncryptedData_init_bio(CMS_ContentInfo *cms)
 258         {
 259         CMS_EncryptedData *enc = cms->d.encryptedData;
 260         if (enc->encryptedContentInfo->cipher && enc->unprotectedAttrs)
 261                 enc->version = 2;
 262         return cms_EncryptedContent_init_bio(enc->encryptedContentInfo);
 263         }