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.
   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/asn1_mac.h>
  62 #include <openssl/x509.h>
  63 #include <openssl/rand.h>
  64
  65 /* PKCS#5 v2.0 password based encryption structures */
  66
  67 int i2d_PBE2PARAM(PBE2PARAM *a, unsigned char **pp)
  68 {
  69         M_ASN1_I2D_vars(a);
  70         M_ASN1_I2D_len (a->keyfunc, i2d_X509_ALGOR);
  71         M_ASN1_I2D_len (a->encryption, i2d_X509_ALGOR);
  72
  73         M_ASN1_I2D_seq_total ();
  74
  75         M_ASN1_I2D_put (a->keyfunc, i2d_X509_ALGOR);
  76         M_ASN1_I2D_put (a->encryption, i2d_X509_ALGOR);
  77
  78         M_ASN1_I2D_finish();
  79 }
  80
  81 PBE2PARAM *PBE2PARAM_new(void)
  82 {
  83         PBE2PARAM *ret=NULL;
  84         ASN1_CTX c;
  85         M_ASN1_New_Malloc(ret, PBE2PARAM);
  86         M_ASN1_New(ret->keyfunc,X509_ALGOR_new);
  87         M_ASN1_New(ret->encryption,X509_ALGOR_new);
  88         return (ret);
  89         M_ASN1_New_Error(ASN1_F_PBE2PARAM_NEW);
  90 }
  91
  92 PBE2PARAM *d2i_PBE2PARAM(PBE2PARAM **a, unsigned char **pp, long length)
  93 {
  94         M_ASN1_D2I_vars(a,PBE2PARAM *,PBE2PARAM_new);
  95         M_ASN1_D2I_Init();
  96         M_ASN1_D2I_start_sequence();
  97         M_ASN1_D2I_get (ret->keyfunc, d2i_X509_ALGOR);
  98         M_ASN1_D2I_get (ret->encryption, d2i_X509_ALGOR);
  99         M_ASN1_D2I_Finish(a, PBE2PARAM_free, ASN1_F_D2I_PBE2PARAM);
 100 }
 101
 102 void PBE2PARAM_free (PBE2PARAM *a)
 103 {
 104         if(a==NULL) return;
 105         X509_ALGOR_free(a->keyfunc);
 106         X509_ALGOR_free(a->encryption);
 107         OPENSSL_free (a);
 108 }
 109
 110 int i2d_PBKDF2PARAM(PBKDF2PARAM *a, unsigned char **pp)
 111 {
 112         M_ASN1_I2D_vars(a);
 113         M_ASN1_I2D_len (a->salt, i2d_ASN1_TYPE);
 114         M_ASN1_I2D_len (a->iter, i2d_ASN1_INTEGER);
 115         M_ASN1_I2D_len (a->keylength, i2d_ASN1_INTEGER);
 116         M_ASN1_I2D_len (a->prf, i2d_X509_ALGOR);
 117
 118         M_ASN1_I2D_seq_total ();
 119
 120         M_ASN1_I2D_put (a->salt, i2d_ASN1_TYPE);
 121         M_ASN1_I2D_put (a->iter, i2d_ASN1_INTEGER);
 122         M_ASN1_I2D_put (a->keylength, i2d_ASN1_INTEGER);
 123         M_ASN1_I2D_put (a->prf, i2d_X509_ALGOR);
 124
 125         M_ASN1_I2D_finish();
 126 }
 127
 128 PBKDF2PARAM *PBKDF2PARAM_new(void)
 129 {
 130         PBKDF2PARAM *ret=NULL;
 131         ASN1_CTX c;
 132         M_ASN1_New_Malloc(ret, PBKDF2PARAM);
 133         M_ASN1_New(ret->salt, ASN1_TYPE_new);
 134         M_ASN1_New(ret->iter, M_ASN1_INTEGER_new);
 135         ret->keylength = NULL;
 136         ret->prf = NULL;
 137         return (ret);
 138         M_ASN1_New_Error(ASN1_F_PBKDF2PARAM_NEW);
 139 }
 140
 141 PBKDF2PARAM *d2i_PBKDF2PARAM(PBKDF2PARAM **a, unsigned char **pp,
 142              long length)
 143 {
 144         M_ASN1_D2I_vars(a,PBKDF2PARAM *,PBKDF2PARAM_new);
 145         M_ASN1_D2I_Init();
 146         M_ASN1_D2I_start_sequence();
 147         M_ASN1_D2I_get (ret->salt, d2i_ASN1_TYPE);
 148         M_ASN1_D2I_get (ret->iter, d2i_ASN1_INTEGER);
 149         M_ASN1_D2I_get_opt (ret->keylength, d2i_ASN1_INTEGER, V_ASN1_INTEGER);
 150         M_ASN1_D2I_get_opt (ret->prf, d2i_X509_ALGOR, V_ASN1_SEQUENCE);
 151         M_ASN1_D2I_Finish(a, PBKDF2PARAM_free, ASN1_F_D2I_PBKDF2PARAM);
 152 }
 153
 154 void PBKDF2PARAM_free (PBKDF2PARAM *a)
 155 {
 156         if(a==NULL) return;
 157         ASN1_TYPE_free(a->salt);
 158         M_ASN1_INTEGER_free(a->iter);
 159         M_ASN1_INTEGER_free(a->keylength);
 160         X509_ALGOR_free(a->prf);
 161         OPENSSL_free (a);
 162 }
 163
 164 /* Return an algorithm identifier for a PKCS#5 v2.0 PBE algorithm:
 165  * yes I know this is horrible!
 166  */
 167
 168 X509_ALGOR *PKCS5_pbe2_set(const EVP_CIPHER *cipher, int iter,
 169                                  unsigned char *salt, int saltlen)
 170 {
 171         X509_ALGOR *scheme = NULL, *kalg = NULL, *ret = NULL;
 172         int alg_nid;
 173         EVP_CIPHER_CTX ctx;
 174         unsigned char iv[EVP_MAX_IV_LENGTH];
 175         PBKDF2PARAM *kdf = NULL;
 176         PBE2PARAM *pbe2 = NULL;
 177         ASN1_OCTET_STRING *osalt = NULL;
 178         ASN1_OBJECT *obj;
 179
 180         alg_nid = EVP_CIPHER_type(cipher);
 181         if(alg_nid == NID_undef) {
 182                 ASN1err(ASN1_F_PKCS5_PBE2_SET,
 183                                 ASN1_R_CIPHER_HAS_NO_OBJECT_IDENTIFIER);
 184                 goto err;
 185         }
 186         obj = OBJ_nid2obj(alg_nid);
 187
 188         if(!(pbe2 = PBE2PARAM_new())) goto merr;
 189
 190         /* Setup the AlgorithmIdentifier for the encryption scheme */
 191         scheme = pbe2->encryption;
 192
 193         scheme->algorithm = obj;
 194         if(!(scheme->parameter = ASN1_TYPE_new())) goto merr;
 195
 196         /* Create random IV */
 197         if (RAND_pseudo_bytes(iv, EVP_CIPHER_iv_length(cipher)) < 0)
 198                 goto err;
 199
 200         /* Dummy cipherinit to just setup the IV */
 201         EVP_CipherInit(&ctx, cipher, NULL, iv, 0);
 202         if(EVP_CIPHER_param_to_asn1(&ctx, scheme->parameter) < 0) {
 203                 ASN1err(ASN1_F_PKCS5_PBE2_SET,
 204                                         ASN1_R_ERROR_SETTING_CIPHER_PARAMS);
 205                 goto err;
 206         }
 207         EVP_CIPHER_CTX_cleanup(&ctx);
 208
 209         if(!(kdf = PBKDF2PARAM_new())) goto merr;
 210         if(!(osalt = M_ASN1_OCTET_STRING_new())) goto merr;
 211
 212         if (!saltlen) saltlen = PKCS5_SALT_LEN;
 213         if (!(osalt->data = OPENSSL_malloc (saltlen))) goto merr;
 214         osalt->length = saltlen;
 215         if (salt) memcpy (osalt->data, salt, saltlen);
 216         else if (RAND_pseudo_bytes (osalt->data, saltlen) < 0) goto merr;
 217
 218         if(iter <= 0) iter = PKCS5_DEFAULT_ITER;
 219         if(!ASN1_INTEGER_set(kdf->iter, iter)) goto merr;
 220
 221         /* Now include salt in kdf structure */
 222         kdf->salt->value.octet_string = osalt;
 223         kdf->salt->type = V_ASN1_OCTET_STRING;
 224         osalt = NULL;
 225
 226         /* If its RC2 then we'd better setup the key length */
 227
 228         if(alg_nid == NID_rc2_cbc) {
 229                 if(!(kdf->keylength = M_ASN1_INTEGER_new())) goto merr;
 230                 if(!ASN1_INTEGER_set (kdf->keylength,
 231                                  EVP_CIPHER_key_length(cipher))) goto merr;
 232         }
 233
 234         /* prf can stay NULL because we are using hmacWithSHA1 */
 235
 236         /* Now setup the PBE2PARAM keyfunc structure */
 237
 238         pbe2->keyfunc->algorithm = OBJ_nid2obj(NID_id_pbkdf2);
 239
 240         /* Encode PBKDF2PARAM into parameter of pbe2 */
 241
 242         if(!(pbe2->keyfunc->parameter = ASN1_TYPE_new())) goto merr;
 243
 244         if(!ASN1_pack_string(kdf, i2d_PBKDF2PARAM,
 245                          &pbe2->keyfunc->parameter->value.sequence)) goto merr;
 246         pbe2->keyfunc->parameter->type = V_ASN1_SEQUENCE;
 247
 248         PBKDF2PARAM_free(kdf);
 249         kdf = NULL;
 250
 251         /* Now set up top level AlgorithmIdentifier */
 252
 253         if(!(ret = X509_ALGOR_new())) goto merr;
 254         if(!(ret->parameter = ASN1_TYPE_new())) goto merr;
 255
 256         ret->algorithm = OBJ_nid2obj(NID_pbes2);
 257
 258         /* Encode PBE2PARAM into parameter */
 259
 260         if(!ASN1_pack_string(pbe2, i2d_PBE2PARAM,
 261                                  &ret->parameter->value.sequence)) goto merr;
 262         ret->parameter->type = V_ASN1_SEQUENCE;
 263
 264         PBE2PARAM_free(pbe2);
 265         pbe2 = NULL;
 266
 267         return ret;
 268
 269         merr:
 270         ASN1err(ASN1_F_PKCS5_PBE2_SET,ERR_R_MALLOC_FAILURE);
 271
 272         err:
 273         PBE2PARAM_free(pbe2);
 274         /* Note 'scheme' is freed as part of pbe2 */
 275         M_ASN1_OCTET_STRING_free(osalt);
 276         PBKDF2PARAM_free(kdf);
 277         X509_ALGOR_free(kalg);
 278         X509_ALGOR_free(ret);
 279
 280         return NULL;
 281
 282 }