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 * Extended version to allow application supplied PRF NID and IV. 87 */ 88 89 X509_ALGOR *PKCS5_pbe2_set_iv(const EVP_CIPHER *cipher, int iter, 90 unsigned char *salt, int saltlen, 91 unsigned char *aiv, int prf_nid) 92 { 93 X509_ALGOR *scheme = NULL, *kalg = NULL, *ret = NULL; 94 int alg_nid; 95 EVP_CIPHER_CTX ctx; 96 unsigned char iv[EVP_MAX_IV_LENGTH]; 97 PBKDF2PARAM *kdf = NULL; 98 PBE2PARAM *pbe2 = NULL; 99 ASN1_OCTET_STRING *osalt = 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())) 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())) goto merr; 117 118 /* Create random IV */ 119 if (EVP_CIPHER_iv_length(cipher)) 120 { 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 EVP_CipherInit_ex(&ctx, cipher, NULL, NULL, iv, 0); 131 if(EVP_CIPHER_param_to_asn1(&ctx, scheme->parameter) < 0) { 132 ASN1err(ASN1_F_PKCS5_PBE2_SET_IV, 133 ASN1_R_ERROR_SETTING_CIPHER_PARAMS); 134 EVP_CIPHER_CTX_cleanup(&ctx); 135 goto err; 136 } 137 /* If prf NID unspecified see if cipher has a preference. 138 * An error is OK here: just means use default PRF. 139 */ 140 if ((prf_nid == -1) && 141 EVP_CIPHER_CTX_ctrl(&ctx, EVP_CTRL_PBE_PRF_NID, 0, &prf_nid) <= 0) 142 { 143 ERR_clear_error(); 144 prf_nid = NID_hmacWithSHA1; 145 } 146 EVP_CIPHER_CTX_cleanup(&ctx); 147 148 if(!(kdf = PBKDF2PARAM_new())) goto merr; 149 if(!(osalt = M_ASN1_OCTET_STRING_new())) goto merr; 150 151 if (!saltlen) saltlen = PKCS5_SALT_LEN; 152 if (!(osalt->data = OPENSSL_malloc (saltlen))) goto merr; 153 osalt->length = saltlen; 154 if (salt) memcpy (osalt->data, salt, saltlen); 155 else if (RAND_pseudo_bytes (osalt->data, saltlen) < 0) goto merr; 156 157 if(iter <= 0) iter = PKCS5_DEFAULT_ITER; 158 if(!ASN1_INTEGER_set(kdf->iter, iter)) goto merr; 159 160 /* Now include salt in kdf structure */ 161 kdf->salt->value.octet_string = osalt; 162 kdf->salt->type = V_ASN1_OCTET_STRING; 163 osalt = NULL; 164 165 /* If its RC2 then we'd better setup the key length */ 166 167 if(alg_nid == NID_rc2_cbc) { 168 if(!(kdf->keylength = M_ASN1_INTEGER_new())) goto merr; 169 if(!ASN1_INTEGER_set (kdf->keylength, 170 EVP_CIPHER_key_length(cipher))) goto merr; 171 } 172 173 /* prf can stay NULL if we are using hmacWithSHA1 */ 174 if (prf_nid != NID_hmacWithSHA1) 175 { 176 kdf->prf = X509_ALGOR_new(); 177 if (!kdf->prf) 178 goto merr; 179 X509_ALGOR_set0(kdf->prf, OBJ_nid2obj(prf_nid), 180 V_ASN1_NULL, NULL); 181 } 182 183 /* Now setup the PBE2PARAM keyfunc structure */ 184 185 pbe2->keyfunc->algorithm = OBJ_nid2obj(NID_id_pbkdf2); 186 187 /* Encode PBKDF2PARAM into parameter of pbe2 */ 188 189 if(!(pbe2->keyfunc->parameter = ASN1_TYPE_new())) goto merr; 190 191 if(!ASN1_item_pack(kdf, ASN1_ITEM_rptr(PBKDF2PARAM), 192 &pbe2->keyfunc->parameter->value.sequence)) goto merr; 193 pbe2->keyfunc->parameter->type = V_ASN1_SEQUENCE; 194 195 PBKDF2PARAM_free(kdf); 196 kdf = NULL; 197 198 /* Now set up top level AlgorithmIdentifier */ 199 200 if(!(ret = X509_ALGOR_new())) goto merr; 201 if(!(ret->parameter = ASN1_TYPE_new())) goto merr; 202 203 ret->algorithm = OBJ_nid2obj(NID_pbes2); 204 205 /* Encode PBE2PARAM into parameter */ 206 207 if(!ASN1_item_pack(pbe2, ASN1_ITEM_rptr(PBE2PARAM), 208 &ret->parameter->value.sequence)) goto merr; 209 ret->parameter->type = V_ASN1_SEQUENCE; 210 211 PBE2PARAM_free(pbe2); 212 pbe2 = NULL; 213 214 return ret; 215 216 merr: 217 ASN1err(ASN1_F_PKCS5_PBE2_SET_IV,ERR_R_MALLOC_FAILURE); 218 219 err: 220 PBE2PARAM_free(pbe2); 221 /* Note 'scheme' is freed as part of pbe2 */ 222 M_ASN1_OCTET_STRING_free(osalt); 223 PBKDF2PARAM_free(kdf); 224 X509_ALGOR_free(kalg); 225 X509_ALGOR_free(ret); 226 227 return NULL; 228 229 } 230 231 X509_ALGOR *PKCS5_pbe2_set(const EVP_CIPHER *cipher, int iter, 232 unsigned char *salt, int saltlen) 233 { 234 return PKCS5_pbe2_set_iv(cipher, iter, salt, saltlen, NULL, -1); 235 } 236
