crypto/asn1/p5_pbev2.c

   1 /* p5_pbev2.c */
   2 /*
   3  * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
   4  * 1999-2004.
   5  */
   6 /* ====================================================================
   7  * Copyright (c) 1999 The OpenSSL Project.  All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  *
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in
  18  *    the documentation and/or other materials provided with the
  19  *    distribution.
  20  *
  21  * 3. All advertising materials mentioning features or use of this
  22  *    software must display the following acknowledgment:
  23  *    "This product includes software developed by the OpenSSL Project
  24  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  25  *
  26  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  27  *    endorse or promote products derived from this software without
  28  *    prior written permission. For written permission, please contact
  29  *    licensing@OpenSSL.org.
  30  *
  31  * 5. Products derived from this software may not be called "OpenSSL"
  32  *    nor may "OpenSSL" appear in their names without prior written
  33  *    permission of the OpenSSL Project.
  34  *
  35  * 6. Redistributions of any form whatsoever must retain the following
  36  *    acknowledgment:
  37  *    "This product includes software developed by the OpenSSL Project
  38  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  41  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  43  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  44  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  45  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  46  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  47  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  49  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  50  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  51  * OF THE POSSIBILITY OF SUCH DAMAGE.
  52  * ====================================================================
  53  *
  54  * This product includes cryptographic software written by Eric Young
  55  * (eay@cryptsoft.com).  This product includes software written by Tim
  56  * Hudson (tjh@cryptsoft.com).
  57  *
  58  */
  59
  60 #include <stdio.h>
  61 #include "cryptlib.h"
  62 #include <openssl/asn1t.h>
  63 #include <openssl/x509.h>
  64 #include <openssl/rand.h>
  65
  66 /* PKCS#5 v2.0 password based encryption structures */
  67
  68 ASN1_SEQUENCE(PBE2PARAM) = {
  69         ASN1_SIMPLE(PBE2PARAM, keyfunc, X509_ALGOR),
  70         ASN1_SIMPLE(PBE2PARAM, encryption, X509_ALGOR)
  71 } ASN1_SEQUENCE_END(PBE2PARAM)
  72
  73 IMPLEMENT_ASN1_FUNCTIONS(PBE2PARAM)
  74
  75 ASN1_SEQUENCE(PBKDF2PARAM) = {
  76         ASN1_SIMPLE(PBKDF2PARAM, salt, ASN1_ANY),
  77         ASN1_SIMPLE(PBKDF2PARAM, iter, ASN1_INTEGER),
  78         ASN1_OPT(PBKDF2PARAM, keylength, ASN1_INTEGER),
  79         ASN1_OPT(PBKDF2PARAM, prf, X509_ALGOR)
  80 } ASN1_SEQUENCE_END(PBKDF2PARAM)
  81
  82 IMPLEMENT_ASN1_FUNCTIONS(PBKDF2PARAM)
  83
  84 /*
  85  * Return an algorithm identifier for a PKCS#5 v2.0 PBE algorithm: yes I know
  86  * this is horrible! Extended version to allow application supplied PRF NID
  87  * and IV.
  88  */
  89
  90 X509_ALGOR *PKCS5_pbe2_set_iv(const EVP_CIPHER *cipher, int iter,
  91                               unsigned char *salt, int saltlen,
  92                               unsigned char *aiv, int prf_nid)
  93 {
  94     X509_ALGOR *scheme = NULL, *kalg = NULL, *ret = NULL;
  95     int alg_nid, keylen;
  96     EVP_CIPHER_CTX ctx;
  97     unsigned char iv[EVP_MAX_IV_LENGTH];
  98     PBE2PARAM *pbe2 = NULL;
  99     ASN1_OBJECT *obj;
 100
 101     alg_nid = EVP_CIPHER_type(cipher);
 102     if (alg_nid == NID_undef) {
 103         ASN1err(ASN1_F_PKCS5_PBE2_SET_IV,
 104                 ASN1_R_CIPHER_HAS_NO_OBJECT_IDENTIFIER);
 105         goto err;
 106     }
 107     obj = OBJ_nid2obj(alg_nid);
 108
 109     if (!(pbe2 = PBE2PARAM_new()))
 110         goto merr;
 111
 112     /* Setup the AlgorithmIdentifier for the encryption scheme */
 113     scheme = pbe2->encryption;
 114
 115     scheme->algorithm = obj;
 116     if (!(scheme->parameter = ASN1_TYPE_new()))
 117         goto merr;
 118
 119     /* Create random IV */
 120     if (EVP_CIPHER_iv_length(cipher)) {
 121         if (aiv)
 122             memcpy(iv, aiv, EVP_CIPHER_iv_length(cipher));
 123         else if (RAND_pseudo_bytes(iv, EVP_CIPHER_iv_length(cipher)) < 0)
 124             goto err;
 125     }
 126
 127     EVP_CIPHER_CTX_init(&ctx);
 128
 129     /* Dummy cipherinit to just setup the IV, and PRF */
 130     if (!EVP_CipherInit_ex(&ctx, cipher, NULL, NULL, iv, 0))
 131         goto err;
 132     if (EVP_CIPHER_param_to_asn1(&ctx, scheme->parameter) < 0) {
 133         ASN1err(ASN1_F_PKCS5_PBE2_SET_IV, ASN1_R_ERROR_SETTING_CIPHER_PARAMS);
 134         EVP_CIPHER_CTX_cleanup(&ctx);
 135         goto err;
 136     }
 137     /*
 138      * If prf NID unspecified see if cipher has a preference. An error is OK
 139      * here: just means use default PRF.
 140      */
 141     if ((prf_nid == -1) &&
 142         EVP_CIPHER_CTX_ctrl(&ctx, EVP_CTRL_PBE_PRF_NID, 0, &prf_nid) <= 0) {
 143         ERR_clear_error();
 144         prf_nid = NID_hmacWithSHA1;
 145     }
 146     EVP_CIPHER_CTX_cleanup(&ctx);
 147
 148     /* If its RC2 then we'd better setup the key length */
 149
 150     if (alg_nid == NID_rc2_cbc)
 151         keylen = EVP_CIPHER_key_length(cipher);
 152     else
 153         keylen = -1;
 154
 155     /* Setup keyfunc */
 156
 157     X509_ALGOR_free(pbe2->keyfunc);
 158
 159     pbe2->keyfunc = PKCS5_pbkdf2_set(iter, salt, saltlen, prf_nid, keylen);
 160
 161     if (!pbe2->keyfunc)
 162         goto merr;
 163
 164     /* Now set up top level AlgorithmIdentifier */
 165
 166     if (!(ret = X509_ALGOR_new()))
 167         goto merr;
 168     if (!(ret->parameter = ASN1_TYPE_new()))
 169         goto merr;
 170
 171     ret->algorithm = OBJ_nid2obj(NID_pbes2);
 172
 173     /* Encode PBE2PARAM into parameter */
 174
 175     if (!ASN1_item_pack(pbe2, ASN1_ITEM_rptr(PBE2PARAM),
 176                         &ret->parameter->value.sequence))
 177          goto merr;
 178     ret->parameter->type = V_ASN1_SEQUENCE;
 179
 180     PBE2PARAM_free(pbe2);
 181     pbe2 = NULL;
 182
 183     return ret;
 184
 185  merr:
 186     ASN1err(ASN1_F_PKCS5_PBE2_SET_IV, ERR_R_MALLOC_FAILURE);
 187
 188  err:
 189     PBE2PARAM_free(pbe2);
 190     /* Note 'scheme' is freed as part of pbe2 */
 191     X509_ALGOR_free(kalg);
 192     X509_ALGOR_free(ret);
 193
 194     return NULL;
 195
 196 }
 197
 198 X509_ALGOR *PKCS5_pbe2_set(const EVP_CIPHER *cipher, int iter,
 199                            unsigned char *salt, int saltlen)
 200 {
 201     return PKCS5_pbe2_set_iv(cipher, iter, salt, saltlen, NULL, -1);
 202 }
 203
 204 X509_ALGOR *PKCS5_pbkdf2_set(int iter, unsigned char *salt, int saltlen,
 205                              int prf_nid, int keylen)
 206 {
 207     X509_ALGOR *keyfunc = NULL;
 208     PBKDF2PARAM *kdf = NULL;
 209     ASN1_OCTET_STRING *osalt = NULL;
 210
 211     if (!(kdf = PBKDF2PARAM_new()))
 212         goto merr;
 213     if (!(osalt = M_ASN1_OCTET_STRING_new()))
 214         goto merr;
 215
 216     kdf->salt->value.octet_string = osalt;
 217     kdf->salt->type = V_ASN1_OCTET_STRING;
 218
 219     if (!saltlen)
 220         saltlen = PKCS5_SALT_LEN;
 221     if (!(osalt->data = OPENSSL_malloc(saltlen)))
 222         goto merr;
 223
 224     osalt->length = saltlen;
 225
 226     if (salt)
 227         memcpy(osalt->data, salt, saltlen);
 228     else if (RAND_pseudo_bytes(osalt->data, saltlen) < 0)
 229         goto merr;
 230
 231     if (iter <= 0)
 232         iter = PKCS5_DEFAULT_ITER;
 233
 234     if (!ASN1_INTEGER_set(kdf->iter, iter))
 235         goto merr;
 236
 237     /* If have a key len set it up */
 238
 239     if (keylen > 0) {
 240         if (!(kdf->keylength = M_ASN1_INTEGER_new()))
 241             goto merr;
 242         if (!ASN1_INTEGER_set(kdf->keylength, keylen))
 243             goto merr;
 244     }
 245
 246     /* prf can stay NULL if we are using hmacWithSHA1 */
 247     if (prf_nid > 0 && prf_nid != NID_hmacWithSHA1) {
 248         kdf->prf = X509_ALGOR_new();
 249         if (!kdf->prf)
 250             goto merr;
 251         X509_ALGOR_set0(kdf->prf, OBJ_nid2obj(prf_nid), V_ASN1_NULL, NULL);
 252     }
 253
 254     /* Finally setup the keyfunc structure */
 255
 256     keyfunc = X509_ALGOR_new();
 257     if (!keyfunc)
 258         goto merr;
 259
 260     keyfunc->algorithm = OBJ_nid2obj(NID_id_pbkdf2);
 261
 262     /* Encode PBKDF2PARAM into parameter of pbe2 */
 263
 264     if (!(keyfunc->parameter = ASN1_TYPE_new()))
 265         goto merr;
 266
 267     if (!ASN1_item_pack(kdf, ASN1_ITEM_rptr(PBKDF2PARAM),
 268                         &keyfunc->parameter->value.sequence))
 269          goto merr;
 270     keyfunc->parameter->type = V_ASN1_SEQUENCE;
 271
 272     PBKDF2PARAM_free(kdf);
 273     return keyfunc;
 274
 275  merr:
 276     ASN1err(ASN1_F_PKCS5_PBKDF2_SET, ERR_R_MALLOC_FAILURE);
 277     PBKDF2PARAM_free(kdf);
 278     X509_ALGOR_free(keyfunc);
 279     return NULL;
 280 }