p5_pbev2.c revision 312826
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 68ASN1_SEQUENCE(PBE2PARAM) = { 69 ASN1_SIMPLE(PBE2PARAM, keyfunc, X509_ALGOR), 70 ASN1_SIMPLE(PBE2PARAM, encryption, X509_ALGOR) 71} ASN1_SEQUENCE_END(PBE2PARAM) 72 73IMPLEMENT_ASN1_FUNCTIONS(PBE2PARAM) 74 75ASN1_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 82IMPLEMENT_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 90X509_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, *ret = NULL; 95 int alg_nid, keylen; 96 EVP_CIPHER_CTX ctx; 97 unsigned char iv[EVP_MAX_IV_LENGTH]; 98 PBE2PARAM *pbe2 = NULL; 99 100 alg_nid = EVP_CIPHER_type(cipher); 101 if (alg_nid == NID_undef) { 102 ASN1err(ASN1_F_PKCS5_PBE2_SET_IV, 103 ASN1_R_CIPHER_HAS_NO_OBJECT_IDENTIFIER); 104 goto err; 105 } 106 107 if (!(pbe2 = PBE2PARAM_new())) 108 goto merr; 109 110 /* Setup the AlgorithmIdentifier for the encryption scheme */ 111 scheme = pbe2->encryption; 112 113 scheme->algorithm = OBJ_nid2obj(alg_nid); 114 if (!(scheme->parameter = ASN1_TYPE_new())) 115 goto merr; 116 117 /* Create random IV */ 118 if (EVP_CIPHER_iv_length(cipher)) { 119 if (aiv) 120 memcpy(iv, aiv, EVP_CIPHER_iv_length(cipher)); 121 else if (RAND_bytes(iv, EVP_CIPHER_iv_length(cipher)) <= 0) 122 goto err; 123 } 124 125 EVP_CIPHER_CTX_init(&ctx); 126 127 /* Dummy cipherinit to just setup the IV, and PRF */ 128 if (!EVP_CipherInit_ex(&ctx, cipher, NULL, NULL, iv, 0)) 129 goto err; 130 if (EVP_CIPHER_param_to_asn1(&ctx, scheme->parameter) < 0) { 131 ASN1err(ASN1_F_PKCS5_PBE2_SET_IV, ASN1_R_ERROR_SETTING_CIPHER_PARAMS); 132 EVP_CIPHER_CTX_cleanup(&ctx); 133 goto err; 134 } 135 /* 136 * If prf NID unspecified see if cipher has a preference. An error is OK 137 * here: just means use default PRF. 138 */ 139 if ((prf_nid == -1) && 140 EVP_CIPHER_CTX_ctrl(&ctx, EVP_CTRL_PBE_PRF_NID, 0, &prf_nid) <= 0) { 141 ERR_clear_error(); 142 prf_nid = NID_hmacWithSHA1; 143 } 144 EVP_CIPHER_CTX_cleanup(&ctx); 145 146 /* If its RC2 then we'd better setup the key length */ 147 148 if (alg_nid == NID_rc2_cbc) 149 keylen = EVP_CIPHER_key_length(cipher); 150 else 151 keylen = -1; 152 153 /* Setup keyfunc */ 154 155 X509_ALGOR_free(pbe2->keyfunc); 156 157 pbe2->keyfunc = PKCS5_pbkdf2_set(iter, salt, saltlen, prf_nid, keylen); 158 159 if (!pbe2->keyfunc) 160 goto merr; 161 162 /* Now set up top level AlgorithmIdentifier */ 163 164 if (!(ret = X509_ALGOR_new())) 165 goto merr; 166 if (!(ret->parameter = ASN1_TYPE_new())) 167 goto merr; 168 169 ret->algorithm = OBJ_nid2obj(NID_pbes2); 170 171 /* Encode PBE2PARAM into parameter */ 172 173 if (!ASN1_item_pack(pbe2, ASN1_ITEM_rptr(PBE2PARAM), 174 &ret->parameter->value.sequence)) 175 goto merr; 176 ret->parameter->type = V_ASN1_SEQUENCE; 177 178 PBE2PARAM_free(pbe2); 179 pbe2 = NULL; 180 181 return ret; 182 183 merr: 184 ASN1err(ASN1_F_PKCS5_PBE2_SET_IV, ERR_R_MALLOC_FAILURE); 185 186 err: 187 PBE2PARAM_free(pbe2); 188 /* Note 'scheme' is freed as part of pbe2 */ 189 X509_ALGOR_free(ret); 190 191 return NULL; 192} 193 194X509_ALGOR *PKCS5_pbe2_set(const EVP_CIPHER *cipher, int iter, 195 unsigned char *salt, int saltlen) 196{ 197 return PKCS5_pbe2_set_iv(cipher, iter, salt, saltlen, NULL, -1); 198} 199 200X509_ALGOR *PKCS5_pbkdf2_set(int iter, unsigned char *salt, int saltlen, 201 int prf_nid, int keylen) 202{ 203 X509_ALGOR *keyfunc = NULL; 204 PBKDF2PARAM *kdf = NULL; 205 ASN1_OCTET_STRING *osalt = NULL; 206 207 if (!(kdf = PBKDF2PARAM_new())) 208 goto merr; 209 if (!(osalt = M_ASN1_OCTET_STRING_new())) 210 goto merr; 211 212 kdf->salt->value.octet_string = osalt; 213 kdf->salt->type = V_ASN1_OCTET_STRING; 214 215 if (!saltlen) 216 saltlen = PKCS5_SALT_LEN; 217 if (!(osalt->data = OPENSSL_malloc(saltlen))) 218 goto merr; 219 220 osalt->length = saltlen; 221 222 if (salt) 223 memcpy(osalt->data, salt, saltlen); 224 else if (RAND_bytes(osalt->data, saltlen) <= 0) 225 goto merr; 226 227 if (iter <= 0) 228 iter = PKCS5_DEFAULT_ITER; 229 230 if (!ASN1_INTEGER_set(kdf->iter, iter)) 231 goto merr; 232 233 /* If have a key len set it up */ 234 235 if (keylen > 0) { 236 if (!(kdf->keylength = M_ASN1_INTEGER_new())) 237 goto merr; 238 if (!ASN1_INTEGER_set(kdf->keylength, keylen)) 239 goto merr; 240 } 241 242 /* prf can stay NULL if we are using hmacWithSHA1 */ 243 if (prf_nid > 0 && prf_nid != NID_hmacWithSHA1) { 244 kdf->prf = X509_ALGOR_new(); 245 if (!kdf->prf) 246 goto merr; 247 X509_ALGOR_set0(kdf->prf, OBJ_nid2obj(prf_nid), V_ASN1_NULL, NULL); 248 } 249 250 /* Finally setup the keyfunc structure */ 251 252 keyfunc = X509_ALGOR_new(); 253 if (!keyfunc) 254 goto merr; 255 256 keyfunc->algorithm = OBJ_nid2obj(NID_id_pbkdf2); 257 258 /* Encode PBKDF2PARAM into parameter of pbe2 */ 259 260 if (!(keyfunc->parameter = ASN1_TYPE_new())) 261 goto merr; 262 263 if (!ASN1_item_pack(kdf, ASN1_ITEM_rptr(PBKDF2PARAM), 264 &keyfunc->parameter->value.sequence)) 265 goto merr; 266 keyfunc->parameter->type = V_ASN1_SEQUENCE; 267 268 PBKDF2PARAM_free(kdf); 269 return keyfunc; 270 271 merr: 272 ASN1err(ASN1_F_PKCS5_PBKDF2_SET, ERR_R_MALLOC_FAILURE); 273 PBKDF2PARAM_free(kdf); 274 X509_ALGOR_free(keyfunc); 275 return NULL; 276} 277