1 /* p5_pbev2.c */ 2 /* Written by Dr Stephen N Henson (steve (at) 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 (at) 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 (at) cryptsoft.com). This product includes software written by Tim 55 * Hudson (tjh (at) 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_of(PBKDF2PARAM, 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_of(PBE2PARAM, 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 } 206
