1 /* p5_pbev2.c */ 2 /* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL 3 * project 1999. 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 "cryptlib.h" 61 #include <openssl/asn1_mac.h> 62 #include <openssl/x509.h> 63 #include <openssl/rand.h> 64 65 /* PKCS#5 v2.0 password based encryption structures */ 66 67 int i2d_PBE2PARAM(PBE2PARAM *a, unsigned char **pp) 68 { 69 M_ASN1_I2D_vars(a); 70 M_ASN1_I2D_len (a->keyfunc, i2d_X509_ALGOR); 71 M_ASN1_I2D_len (a->encryption, i2d_X509_ALGOR); 72 73 M_ASN1_I2D_seq_total (); 74 75 M_ASN1_I2D_put (a->keyfunc, i2d_X509_ALGOR); 76 M_ASN1_I2D_put (a->encryption, i2d_X509_ALGOR); 77 78 M_ASN1_I2D_finish(); 79 } 80 81 PBE2PARAM *PBE2PARAM_new(void) 82 { 83 PBE2PARAM *ret=NULL; 84 ASN1_CTX c; 85 M_ASN1_New_Malloc(ret, PBE2PARAM); 86 M_ASN1_New(ret->keyfunc,X509_ALGOR_new); 87 M_ASN1_New(ret->encryption,X509_ALGOR_new); 88 return (ret); 89 M_ASN1_New_Error(ASN1_F_PBE2PARAM_NEW); 90 } 91 92 PBE2PARAM *d2i_PBE2PARAM(PBE2PARAM **a, unsigned char **pp, long length) 93 { 94 M_ASN1_D2I_vars(a,PBE2PARAM *,PBE2PARAM_new); 95 M_ASN1_D2I_Init(); 96 M_ASN1_D2I_start_sequence(); 97 M_ASN1_D2I_get (ret->keyfunc, d2i_X509_ALGOR); 98 M_ASN1_D2I_get (ret->encryption, d2i_X509_ALGOR); 99 M_ASN1_D2I_Finish(a, PBE2PARAM_free, ASN1_F_D2I_PBE2PARAM); 100 } 101 102 void PBE2PARAM_free (PBE2PARAM *a) 103 { 104 if(a==NULL) return; 105 X509_ALGOR_free(a->keyfunc); 106 X509_ALGOR_free(a->encryption); 107 OPENSSL_free (a); 108 } 109 110 int i2d_PBKDF2PARAM(PBKDF2PARAM *a, unsigned char **pp) 111 { 112 M_ASN1_I2D_vars(a); 113 M_ASN1_I2D_len (a->salt, i2d_ASN1_TYPE); 114 M_ASN1_I2D_len (a->iter, i2d_ASN1_INTEGER); 115 M_ASN1_I2D_len (a->keylength, i2d_ASN1_INTEGER); 116 M_ASN1_I2D_len (a->prf, i2d_X509_ALGOR); 117 118 M_ASN1_I2D_seq_total (); 119 120 M_ASN1_I2D_put (a->salt, i2d_ASN1_TYPE); 121 M_ASN1_I2D_put (a->iter, i2d_ASN1_INTEGER); 122 M_ASN1_I2D_put (a->keylength, i2d_ASN1_INTEGER); 123 M_ASN1_I2D_put (a->prf, i2d_X509_ALGOR); 124 125 M_ASN1_I2D_finish(); 126 } 127 128 PBKDF2PARAM *PBKDF2PARAM_new(void) 129 { 130 PBKDF2PARAM *ret=NULL; 131 ASN1_CTX c; 132 M_ASN1_New_Malloc(ret, PBKDF2PARAM); 133 M_ASN1_New(ret->salt, ASN1_TYPE_new); 134 M_ASN1_New(ret->iter, M_ASN1_INTEGER_new); 135 ret->keylength = NULL; 136 ret->prf = NULL; 137 return (ret); 138 M_ASN1_New_Error(ASN1_F_PBKDF2PARAM_NEW); 139 } 140 141 PBKDF2PARAM *d2i_PBKDF2PARAM(PBKDF2PARAM **a, unsigned char **pp, 142 long length) 143 { 144 M_ASN1_D2I_vars(a,PBKDF2PARAM *,PBKDF2PARAM_new); 145 M_ASN1_D2I_Init(); 146 M_ASN1_D2I_start_sequence(); 147 M_ASN1_D2I_get (ret->salt, d2i_ASN1_TYPE); 148 M_ASN1_D2I_get (ret->iter, d2i_ASN1_INTEGER); 149 M_ASN1_D2I_get_opt (ret->keylength, d2i_ASN1_INTEGER, V_ASN1_INTEGER); 150 M_ASN1_D2I_get_opt (ret->prf, d2i_X509_ALGOR, V_ASN1_SEQUENCE); 151 M_ASN1_D2I_Finish(a, PBKDF2PARAM_free, ASN1_F_D2I_PBKDF2PARAM); 152 } 153 154 void PBKDF2PARAM_free (PBKDF2PARAM *a) 155 { 156 if(a==NULL) return; 157 ASN1_TYPE_free(a->salt); 158 M_ASN1_INTEGER_free(a->iter); 159 M_ASN1_INTEGER_free(a->keylength); 160 X509_ALGOR_free(a->prf); 161 OPENSSL_free (a); 162 } 163 164 /* Return an algorithm identifier for a PKCS#5 v2.0 PBE algorithm: 165 * yes I know this is horrible! 166 */ 167 168 X509_ALGOR *PKCS5_pbe2_set(const EVP_CIPHER *cipher, int iter, 169 unsigned char *salt, int saltlen) 170 { 171 X509_ALGOR *scheme = NULL, *kalg = NULL, *ret = NULL; 172 int alg_nid; 173 EVP_CIPHER_CTX ctx; 174 unsigned char iv[EVP_MAX_IV_LENGTH]; 175 PBKDF2PARAM *kdf = NULL; 176 PBE2PARAM *pbe2 = NULL; 177 ASN1_OCTET_STRING *osalt = NULL; 178 ASN1_OBJECT *obj; 179 180 alg_nid = EVP_CIPHER_type(cipher); 181 if(alg_nid == NID_undef) { 182 ASN1err(ASN1_F_PKCS5_PBE2_SET, 183 ASN1_R_CIPHER_HAS_NO_OBJECT_IDENTIFIER); 184 goto err; 185 } 186 obj = OBJ_nid2obj(alg_nid); 187 188 if(!(pbe2 = PBE2PARAM_new())) goto merr; 189 190 /* Setup the AlgorithmIdentifier for the encryption scheme */ 191 scheme = pbe2->encryption; 192 193 scheme->algorithm = obj; 194 if(!(scheme->parameter = ASN1_TYPE_new())) goto merr; 195 196 /* Create random IV */ 197 if (RAND_pseudo_bytes(iv, EVP_CIPHER_iv_length(cipher)) < 0) 198 goto err; 199 200 /* Dummy cipherinit to just setup the IV */ 201 EVP_CipherInit(&ctx, cipher, NULL, iv, 0); 202 if(EVP_CIPHER_param_to_asn1(&ctx, scheme->parameter) < 0) { 203 ASN1err(ASN1_F_PKCS5_PBE2_SET, 204 ASN1_R_ERROR_SETTING_CIPHER_PARAMS); 205 goto err; 206 } 207 EVP_CIPHER_CTX_cleanup(&ctx); 208 209 if(!(kdf = PBKDF2PARAM_new())) goto merr; 210 if(!(osalt = M_ASN1_OCTET_STRING_new())) goto merr; 211 212 if (!saltlen) saltlen = PKCS5_SALT_LEN; 213 if (!(osalt->data = OPENSSL_malloc (saltlen))) goto merr; 214 osalt->length = saltlen; 215 if (salt) memcpy (osalt->data, salt, saltlen); 216 else if (RAND_pseudo_bytes (osalt->data, saltlen) < 0) goto merr; 217 218 if(iter <= 0) iter = PKCS5_DEFAULT_ITER; 219 if(!ASN1_INTEGER_set(kdf->iter, iter)) goto merr; 220 221 /* Now include salt in kdf structure */ 222 kdf->salt->value.octet_string = osalt; 223 kdf->salt->type = V_ASN1_OCTET_STRING; 224 osalt = NULL; 225 226 /* If its RC2 then we'd better setup the key length */ 227 228 if(alg_nid == NID_rc2_cbc) { 229 if(!(kdf->keylength = M_ASN1_INTEGER_new())) goto merr; 230 if(!ASN1_INTEGER_set (kdf->keylength, 231 EVP_CIPHER_key_length(cipher))) goto merr; 232 } 233 234 /* prf can stay NULL because we are using hmacWithSHA1 */ 235 236 /* Now setup the PBE2PARAM keyfunc structure */ 237 238 pbe2->keyfunc->algorithm = OBJ_nid2obj(NID_id_pbkdf2); 239 240 /* Encode PBKDF2PARAM into parameter of pbe2 */ 241 242 if(!(pbe2->keyfunc->parameter = ASN1_TYPE_new())) goto merr; 243 244 if(!ASN1_pack_string(kdf, i2d_PBKDF2PARAM, 245 &pbe2->keyfunc->parameter->value.sequence)) goto merr; 246 pbe2->keyfunc->parameter->type = V_ASN1_SEQUENCE; 247 248 PBKDF2PARAM_free(kdf); 249 kdf = NULL; 250 251 /* Now set up top level AlgorithmIdentifier */ 252 253 if(!(ret = X509_ALGOR_new())) goto merr; 254 if(!(ret->parameter = ASN1_TYPE_new())) goto merr; 255 256 ret->algorithm = OBJ_nid2obj(NID_pbes2); 257 258 /* Encode PBE2PARAM into parameter */ 259 260 if(!ASN1_pack_string(pbe2, i2d_PBE2PARAM, 261 &ret->parameter->value.sequence)) goto merr; 262 ret->parameter->type = V_ASN1_SEQUENCE; 263 264 PBE2PARAM_free(pbe2); 265 pbe2 = NULL; 266 267 return ret; 268 269 merr: 270 ASN1err(ASN1_F_PKCS5_PBE2_SET,ERR_R_MALLOC_FAILURE); 271 272 err: 273 PBE2PARAM_free(pbe2); 274 /* Note 'scheme' is freed as part of pbe2 */ 275 M_ASN1_OCTET_STRING_free(osalt); 276 PBKDF2PARAM_free(kdf); 277 X509_ALGOR_free(kalg); 278 X509_ALGOR_free(ret); 279 280 return NULL; 281 282 } 283