crypto/openssl-0.9.7e/crypto/asn1/p5_pbev2.c

   1 /* p5_pbev2.c */
   2 /* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
   3  * project 1999-2004.
   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/asn1t.h>
  62 #include <openssl/x509.h>
  63 #include <openssl/rand.h>
  64
  65 /* PKCS#5 v2.0 password based encryption structures */
  66
  67 ASN1_SEQUENCE(PBE2PARAM) = {
  68         ASN1_SIMPLE(PBE2PARAM, keyfunc, X509_ALGOR),
  69         ASN1_SIMPLE(PBE2PARAM, encryption, X509_ALGOR)
  70 } ASN1_SEQUENCE_END(PBE2PARAM)
  71
  72 IMPLEMENT_ASN1_FUNCTIONS(PBE2PARAM)
  73
  74 ASN1_SEQUENCE(PBKDF2PARAM) = {
  75         ASN1_SIMPLE(PBKDF2PARAM, salt, ASN1_ANY),
  76         ASN1_SIMPLE(PBKDF2PARAM, iter, ASN1_INTEGER),
  77         ASN1_OPT(PBKDF2PARAM, keylength, ASN1_INTEGER),
  78         ASN1_OPT(PBKDF2PARAM, prf, X509_ALGOR)
  79 } ASN1_SEQUENCE_END(PBKDF2PARAM)
  80
  81 IMPLEMENT_ASN1_FUNCTIONS(PBKDF2PARAM)
  82
  83 /* Return an algorithm identifier for a PKCS#5 v2.0 PBE algorithm:
  84  * yes I know this is horrible!
  85  */
  86
  87 X509_ALGOR *PKCS5_pbe2_set(const EVP_CIPHER *cipher, int iter,
  88                                  unsigned char *salt, int saltlen)
  89 {
  90         X509_ALGOR *scheme = NULL, *kalg = NULL, *ret = NULL;
  91         int alg_nid;
  92         EVP_CIPHER_CTX ctx;
  93         unsigned char iv[EVP_MAX_IV_LENGTH];
  94         PBKDF2PARAM *kdf = NULL;
  95         PBE2PARAM *pbe2 = NULL;
  96         ASN1_OCTET_STRING *osalt = NULL;
  97         ASN1_OBJECT *obj;
  98
  99         alg_nid = EVP_CIPHER_type(cipher);
 100         if(alg_nid == NID_undef) {
 101                 ASN1err(ASN1_F_PKCS5_PBE2_SET,
 102                                 ASN1_R_CIPHER_HAS_NO_OBJECT_IDENTIFIER);
 103                 goto err;
 104         }
 105         obj = OBJ_nid2obj(alg_nid);
 106
 107         if(!(pbe2 = PBE2PARAM_new())) goto merr;
 108
 109         /* Setup the AlgorithmIdentifier for the encryption scheme */
 110         scheme = pbe2->encryption;
 111
 112         scheme->algorithm = obj;
 113         if(!(scheme->parameter = ASN1_TYPE_new())) goto merr;
 114
 115         /* Create random IV */
 116         if (EVP_CIPHER_iv_length(cipher) &&
 117                 RAND_pseudo_bytes(iv, EVP_CIPHER_iv_length(cipher)) < 0)
 118                 goto err;
 119
 120         EVP_CIPHER_CTX_init(&ctx);
 121
 122         /* Dummy cipherinit to just setup the IV */
 123         EVP_CipherInit_ex(&ctx, cipher, NULL, NULL, iv, 0);
 124         if(EVP_CIPHER_param_to_asn1(&ctx, scheme->parameter) < 0) {
 125                 ASN1err(ASN1_F_PKCS5_PBE2_SET,
 126                                         ASN1_R_ERROR_SETTING_CIPHER_PARAMS);
 127                 EVP_CIPHER_CTX_cleanup(&ctx);
 128                 goto err;
 129         }
 130         EVP_CIPHER_CTX_cleanup(&ctx);
 131
 132         if(!(kdf = PBKDF2PARAM_new())) goto merr;
 133         if(!(osalt = M_ASN1_OCTET_STRING_new())) goto merr;
 134
 135         if (!saltlen) saltlen = PKCS5_SALT_LEN;
 136         if (!(osalt->data = OPENSSL_malloc (saltlen))) goto merr;
 137         osalt->length = saltlen;
 138         if (salt) memcpy (osalt->data, salt, saltlen);
 139         else if (RAND_pseudo_bytes (osalt->data, saltlen) < 0) goto merr;
 140
 141         if(iter <= 0) iter = PKCS5_DEFAULT_ITER;
 142         if(!ASN1_INTEGER_set(kdf->iter, iter)) goto merr;
 143
 144         /* Now include salt in kdf structure */
 145         kdf->salt->value.octet_string = osalt;
 146         kdf->salt->type = V_ASN1_OCTET_STRING;
 147         osalt = NULL;
 148
 149         /* If its RC2 then we'd better setup the key length */
 150
 151         if(alg_nid == NID_rc2_cbc) {
 152                 if(!(kdf->keylength = M_ASN1_INTEGER_new())) goto merr;
 153                 if(!ASN1_INTEGER_set (kdf->keylength,
 154                                  EVP_CIPHER_key_length(cipher))) goto merr;
 155         }
 156
 157         /* prf can stay NULL because we are using hmacWithSHA1 */
 158
 159         /* Now setup the PBE2PARAM keyfunc structure */
 160
 161         pbe2->keyfunc->algorithm = OBJ_nid2obj(NID_id_pbkdf2);
 162
 163         /* Encode PBKDF2PARAM into parameter of pbe2 */
 164
 165         if(!(pbe2->keyfunc->parameter = ASN1_TYPE_new())) goto merr;
 166
 167         if(!ASN1_pack_string(kdf, i2d_PBKDF2PARAM,
 168                          &pbe2->keyfunc->parameter->value.sequence)) goto merr;
 169         pbe2->keyfunc->parameter->type = V_ASN1_SEQUENCE;
 170
 171         PBKDF2PARAM_free(kdf);
 172         kdf = NULL;
 173
 174         /* Now set up top level AlgorithmIdentifier */
 175
 176         if(!(ret = X509_ALGOR_new())) goto merr;
 177         if(!(ret->parameter = ASN1_TYPE_new())) goto merr;
 178
 179         ret->algorithm = OBJ_nid2obj(NID_pbes2);
 180
 181         /* Encode PBE2PARAM into parameter */
 182
 183         if(!ASN1_pack_string(pbe2, i2d_PBE2PARAM,
 184                                  &ret->parameter->value.sequence)) goto merr;
 185         ret->parameter->type = V_ASN1_SEQUENCE;
 186
 187         PBE2PARAM_free(pbe2);
 188         pbe2 = NULL;
 189
 190         return ret;
 191
 192         merr:
 193         ASN1err(ASN1_F_PKCS5_PBE2_SET,ERR_R_MALLOC_FAILURE);
 194
 195         err:
 196         PBE2PARAM_free(pbe2);
 197         /* Note 'scheme' is freed as part of pbe2 */
 198         M_ASN1_OCTET_STRING_free(osalt);
 199         PBKDF2PARAM_free(kdf);
 200         X509_ALGOR_free(kalg);
 201         X509_ALGOR_free(ret);
 202
 203         return NULL;
 204
 205 }