1 /* $OpenBSD: p5_pbev2.c,v 1.17 2014/07/11 08:44:47 jsing Exp $ */ 2 /* Written by Dr Stephen N Henson (steve@openssl.org) 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 <string.h> 61 62 #include <openssl/asn1t.h> 63 #include <openssl/err.h> 64 #include <openssl/rand.h> 65 #include <openssl/x509.h> 66 67 /* PKCS#5 v2.0 password based encryption structures */ 68 69 ASN1_SEQUENCE(PBE2PARAM) = { 70 ASN1_SIMPLE(PBE2PARAM, keyfunc, X509_ALGOR), 71 ASN1_SIMPLE(PBE2PARAM, encryption, X509_ALGOR) 72 } ASN1_SEQUENCE_END(PBE2PARAM) 73 74 IMPLEMENT_ASN1_FUNCTIONS(PBE2PARAM) 75 76 ASN1_SEQUENCE(PBKDF2PARAM) = { 77 ASN1_SIMPLE(PBKDF2PARAM, salt, ASN1_ANY), 78 ASN1_SIMPLE(PBKDF2PARAM, iter, ASN1_INTEGER), 79 ASN1_OPT(PBKDF2PARAM, keylength, ASN1_INTEGER), 80 ASN1_OPT(PBKDF2PARAM, prf, X509_ALGOR) 81 } ASN1_SEQUENCE_END(PBKDF2PARAM) 82 83 IMPLEMENT_ASN1_FUNCTIONS(PBKDF2PARAM) 84 85 /* Return an algorithm identifier for a PKCS#5 v2.0 PBE algorithm: 86 * yes I know this is horrible! 87 * 88 * Extended version to allow application supplied PRF NID and IV. 89 */ 90 91 X509_ALGOR * 92 PKCS5_pbe2_set_iv(const EVP_CIPHER *cipher, int iter, unsigned char *salt, 93 int saltlen, unsigned char *aiv, int prf_nid) 94 { 95 X509_ALGOR *scheme = NULL, *kalg = NULL, *ret = NULL; 96 int alg_nid, keylen; 97 EVP_CIPHER_CTX ctx; 98 unsigned char iv[EVP_MAX_IV_LENGTH]; 99 PBE2PARAM *pbe2 = NULL; 100 ASN1_OBJECT *obj; 101 102 alg_nid = EVP_CIPHER_type(cipher); 103 if (alg_nid == NID_undef) { 104 ASN1err(ASN1_F_PKCS5_PBE2_SET_IV, 105 ASN1_R_CIPHER_HAS_NO_OBJECT_IDENTIFIER); 106 goto err; 107 } 108 obj = OBJ_nid2obj(alg_nid); 109 110 if (!(pbe2 = PBE2PARAM_new())) 111 goto merr; 112 113 /* Setup the AlgorithmIdentifier for the encryption scheme */ 114 scheme = pbe2->encryption; 115 116 scheme->algorithm = obj; 117 if (!(scheme->parameter = ASN1_TYPE_new())) 118 goto merr; 119 120 /* Create random IV */ 121 if (EVP_CIPHER_iv_length(cipher)) { 122 if (aiv) 123 memcpy(iv, aiv, EVP_CIPHER_iv_length(cipher)); 124 else if (RAND_pseudo_bytes(iv, 125 EVP_CIPHER_iv_length(cipher)) < 0) 126 goto err; 127 } 128 129 EVP_CIPHER_CTX_init(&ctx); 130 131 /* Dummy cipherinit to just setup the IV, and PRF */ 132 if (!EVP_CipherInit_ex(&ctx, cipher, NULL, NULL, iv, 0)) 133 goto err; 134 if (EVP_CIPHER_param_to_asn1(&ctx, scheme->parameter) < 0) { 135 ASN1err(ASN1_F_PKCS5_PBE2_SET_IV, 136 ASN1_R_ERROR_SETTING_CIPHER_PARAMS); 137 EVP_CIPHER_CTX_cleanup(&ctx); 138 goto err; 139 } 140 /* If prf NID unspecified see if cipher has a preference. 141 * An error is OK here: just means use default PRF. 142 */ 143 if ((prf_nid == -1) && 144 EVP_CIPHER_CTX_ctrl(&ctx, EVP_CTRL_PBE_PRF_NID, 0, &prf_nid) <= 0) { 145 ERR_clear_error(); 146 prf_nid = NID_hmacWithSHA1; 147 } 148 EVP_CIPHER_CTX_cleanup(&ctx); 149 150 /* If its RC2 then we'd better setup the key length */ 151 152 if (alg_nid == NID_rc2_cbc) 153 keylen = EVP_CIPHER_key_length(cipher); 154 else 155 keylen = -1; 156 157 /* Setup keyfunc */ 158 159 X509_ALGOR_free(pbe2->keyfunc); 160 161 pbe2->keyfunc = PKCS5_pbkdf2_set(iter, salt, saltlen, prf_nid, keylen); 162 163 if (!pbe2->keyfunc) 164 goto merr; 165 166 /* Now set up top level AlgorithmIdentifier */ 167 168 if (!(ret = X509_ALGOR_new())) 169 goto merr; 170 if (!(ret->parameter = ASN1_TYPE_new())) 171 goto merr; 172 173 ret->algorithm = OBJ_nid2obj(NID_pbes2); 174 175 /* Encode PBE2PARAM into parameter */ 176 177 if (!ASN1_item_pack(pbe2, ASN1_ITEM_rptr(PBE2PARAM), 178 &ret->parameter->value.sequence)) goto merr; 179 ret->parameter->type = V_ASN1_SEQUENCE; 180 181 PBE2PARAM_free(pbe2); 182 pbe2 = NULL; 183 184 return ret; 185 186 merr: 187 ASN1err(ASN1_F_PKCS5_PBE2_SET_IV, ERR_R_MALLOC_FAILURE); 188 189 err: 190 PBE2PARAM_free(pbe2); 191 /* Note 'scheme' is freed as part of pbe2 */ 192 X509_ALGOR_free(kalg); 193 X509_ALGOR_free(ret); 194 195 return NULL; 196 } 197 198 X509_ALGOR * 199 PKCS5_pbe2_set(const EVP_CIPHER *cipher, int iter, unsigned char *salt, 200 int saltlen) 201 { 202 return PKCS5_pbe2_set_iv(cipher, iter, salt, saltlen, NULL, -1); 203 } 204 205 X509_ALGOR * 206 PKCS5_pbkdf2_set(int iter, unsigned char *salt, int saltlen, int prf_nid, 207 int keylen) 208 { 209 X509_ALGOR *keyfunc = NULL; 210 PBKDF2PARAM *kdf = NULL; 211 ASN1_OCTET_STRING *osalt = NULL; 212 213 if (!(kdf = PBKDF2PARAM_new())) 214 goto merr; 215 if (!(osalt = M_ASN1_OCTET_STRING_new())) 216 goto merr; 217 218 kdf->salt->value.octet_string = osalt; 219 kdf->salt->type = V_ASN1_OCTET_STRING; 220 221 if (!saltlen) 222 saltlen = PKCS5_SALT_LEN; 223 if (!(osalt->data = malloc (saltlen))) 224 goto merr; 225 226 osalt->length = saltlen; 227 228 if (salt) 229 memcpy (osalt->data, salt, saltlen); 230 else if (RAND_pseudo_bytes (osalt->data, saltlen) < 0) 231 goto merr; 232 233 if (iter <= 0) 234 iter = PKCS5_DEFAULT_ITER; 235 236 if (!ASN1_INTEGER_set(kdf->iter, iter)) 237 goto merr; 238 239 /* If have a key len set it up */ 240 241 if (keylen > 0) { 242 if (!(kdf->keylength = M_ASN1_INTEGER_new())) 243 goto merr; 244 if (!ASN1_INTEGER_set (kdf->keylength, keylen)) 245 goto merr; 246 } 247 248 /* prf can stay NULL if we are using hmacWithSHA1 */ 249 if (prf_nid > 0 && prf_nid != NID_hmacWithSHA1) { 250 kdf->prf = X509_ALGOR_new(); 251 if (!kdf->prf) 252 goto merr; 253 X509_ALGOR_set0(kdf->prf, OBJ_nid2obj(prf_nid), 254 V_ASN1_NULL, NULL); 255 } 256 257 /* Finally setup the keyfunc structure */ 258 259 keyfunc = X509_ALGOR_new(); 260 if (!keyfunc) 261 goto merr; 262 263 keyfunc->algorithm = OBJ_nid2obj(NID_id_pbkdf2); 264 265 /* Encode PBKDF2PARAM into parameter of pbe2 */ 266 267 if (!(keyfunc->parameter = ASN1_TYPE_new())) 268 goto merr; 269 270 if (!ASN1_item_pack(kdf, ASN1_ITEM_rptr(PBKDF2PARAM), 271 &keyfunc->parameter->value.sequence)) 272 goto merr; 273 keyfunc->parameter->type = V_ASN1_SEQUENCE; 274 275 PBKDF2PARAM_free(kdf); 276 return keyfunc; 277 278 merr: 279 ASN1err(ASN1_F_PKCS5_PBKDF2_SET, ERR_R_MALLOC_FAILURE); 280 PBKDF2PARAM_free(kdf); 281 X509_ALGOR_free(keyfunc); 282 return NULL; 283 } 284