1 /* $OpenBSD: p12_mutl.c,v 1.38 2024/03/24 06:48:03 tb Exp $ */ 2 /* Written by Dr Stephen N Henson (steve@openssl.org) 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 <stdlib.h> 61 #include <string.h> 62 63 #include <openssl/opensslconf.h> 64 65 #ifndef OPENSSL_NO_HMAC 66 67 #include <openssl/err.h> 68 #include <openssl/hmac.h> 69 #include <openssl/pkcs12.h> 70 71 #include "evp_local.h" 72 #include "hmac_local.h" 73 #include "pkcs12_local.h" 74 #include "x509_local.h" 75 76 int 77 PKCS12_mac_present(const PKCS12 *p12) 78 { 79 return p12->mac != NULL; 80 } 81 LCRYPTO_ALIAS(PKCS12_mac_present); 82 83 void 84 PKCS12_get0_mac(const ASN1_OCTET_STRING **pmac, const X509_ALGOR **pmacalg, 85 const ASN1_OCTET_STRING **psalt, const ASN1_INTEGER **piter, 86 const PKCS12 *p12) 87 { 88 if (p12->mac == NULL) { 89 if (pmac != NULL) 90 *pmac = NULL; 91 if (pmacalg != NULL) 92 *pmacalg = NULL; 93 if (psalt != NULL) 94 *psalt = NULL; 95 if (piter != NULL) 96 *piter = NULL; 97 return; 98 } 99 100 if (pmac != NULL) 101 *pmac = p12->mac->dinfo->digest; 102 if (pmacalg != NULL) 103 *pmacalg = p12->mac->dinfo->algor; 104 if (psalt != NULL) 105 *psalt = p12->mac->salt; 106 if (piter != NULL) 107 *piter = p12->mac->iter; 108 } 109 LCRYPTO_ALIAS(PKCS12_get0_mac); 110 111 /* Generate a MAC */ 112 int 113 PKCS12_gen_mac(PKCS12 *p12, const char *pass, int passlen, 114 unsigned char *mac, unsigned int *maclen) 115 { 116 const EVP_MD *md_type; 117 HMAC_CTX *hmac = NULL; 118 ASN1_OCTET_STRING *aos; 119 unsigned char key[EVP_MAX_MD_SIZE], *salt; 120 int saltlen, iter; 121 int md_size; 122 int ret = 0; 123 124 if (!PKCS7_type_is_data(p12->authsafes)) { 125 PKCS12error(PKCS12_R_CONTENT_TYPE_NOT_DATA); 126 goto err; 127 } 128 if ((aos = PKCS7_get_octet_string(p12->authsafes)) == NULL) { 129 PKCS12error(PKCS12_R_DECODE_ERROR); 130 goto err; 131 } 132 133 salt = p12->mac->salt->data; 134 saltlen = p12->mac->salt->length; 135 136 iter = 1; 137 if (p12->mac->iter != NULL) { 138 if ((iter = ASN1_INTEGER_get(p12->mac->iter)) <= 0) { 139 PKCS12error(PKCS12_R_DECODE_ERROR); 140 goto err; 141 } 142 } 143 144 md_type = EVP_get_digestbyobj(p12->mac->dinfo->algor->algorithm); 145 if (md_type == NULL) { 146 PKCS12error(PKCS12_R_UNKNOWN_DIGEST_ALGORITHM); 147 goto err; 148 } 149 150 if ((md_size = EVP_MD_size(md_type)) < 0) 151 goto err; 152 153 if (!PKCS12_key_gen(pass, passlen, salt, saltlen, PKCS12_MAC_ID, iter, 154 md_size, key, md_type)) { 155 PKCS12error(PKCS12_R_KEY_GEN_ERROR); 156 goto err; 157 } 158 159 if ((hmac = HMAC_CTX_new()) == NULL) 160 goto err; 161 if (!HMAC_Init_ex(hmac, key, md_size, md_type, NULL)) 162 goto err; 163 if (!HMAC_Update(hmac, aos->data, aos->length)) 164 goto err; 165 if (!HMAC_Final(hmac, mac, maclen)) 166 goto err; 167 168 ret = 1; 169 170 err: 171 explicit_bzero(key, sizeof(key)); 172 HMAC_CTX_free(hmac); 173 174 return ret; 175 } 176 177 /* Verify the mac */ 178 int 179 PKCS12_verify_mac(PKCS12 *p12, const char *pass, int passlen) 180 { 181 unsigned char mac[EVP_MAX_MD_SIZE]; 182 unsigned int maclen; 183 184 if (p12->mac == NULL) { 185 PKCS12error(PKCS12_R_MAC_ABSENT); 186 return 0; 187 } 188 if (!PKCS12_gen_mac(p12, pass, passlen, mac, &maclen)) { 189 PKCS12error(PKCS12_R_MAC_GENERATION_ERROR); 190 return 0; 191 } 192 if ((maclen != (unsigned int)p12->mac->dinfo->digest->length) || 193 memcmp(mac, p12->mac->dinfo->digest->data, maclen)) 194 return 0; 195 return 1; 196 } 197 LCRYPTO_ALIAS(PKCS12_verify_mac); 198 199 /* Set a mac */ 200 201 int 202 PKCS12_set_mac(PKCS12 *p12, const char *pass, int passlen, unsigned char *salt, 203 int saltlen, int iter, const EVP_MD *md_type) 204 { 205 unsigned char mac[EVP_MAX_MD_SIZE]; 206 unsigned int maclen; 207 208 if (!md_type) 209 md_type = EVP_sha1(); 210 if (PKCS12_setup_mac(p12, iter, salt, saltlen, md_type) == 211 PKCS12_ERROR) { 212 PKCS12error(PKCS12_R_MAC_SETUP_ERROR); 213 return 0; 214 } 215 if (!PKCS12_gen_mac(p12, pass, passlen, mac, &maclen)) { 216 PKCS12error(PKCS12_R_MAC_GENERATION_ERROR); 217 return 0; 218 } 219 if (!(ASN1_STRING_set(p12->mac->dinfo->digest, mac, maclen))) { 220 PKCS12error(PKCS12_R_MAC_STRING_SET_ERROR); 221 return 0; 222 } 223 return 1; 224 } 225 LCRYPTO_ALIAS(PKCS12_set_mac); 226 227 /* Set up a mac structure */ 228 int 229 PKCS12_setup_mac(PKCS12 *p12, int iter, unsigned char *salt, int saltlen, 230 const EVP_MD *md_type) 231 { 232 PKCS12_MAC_DATA_free(p12->mac); 233 if ((p12->mac = PKCS12_MAC_DATA_new()) == NULL) 234 return PKCS12_ERROR; 235 if (iter > 1) { 236 if (!(p12->mac->iter = ASN1_INTEGER_new())) { 237 PKCS12error(ERR_R_MALLOC_FAILURE); 238 return 0; 239 } 240 if (!ASN1_INTEGER_set(p12->mac->iter, iter)) { 241 PKCS12error(ERR_R_MALLOC_FAILURE); 242 return 0; 243 } 244 } 245 if (!saltlen) 246 saltlen = PKCS12_SALT_LEN; 247 if (!(p12->mac->salt->data = malloc(saltlen))) { 248 PKCS12error(ERR_R_MALLOC_FAILURE); 249 return 0; 250 } 251 p12->mac->salt->length = saltlen; 252 if (!salt) 253 arc4random_buf(p12->mac->salt->data, saltlen); 254 else 255 memcpy(p12->mac->salt->data, salt, saltlen); 256 p12->mac->dinfo->algor->algorithm = OBJ_nid2obj(EVP_MD_type(md_type)); 257 if (!(p12->mac->dinfo->algor->parameter = ASN1_TYPE_new())) { 258 PKCS12error(ERR_R_MALLOC_FAILURE); 259 return 0; 260 } 261 p12->mac->dinfo->algor->parameter->type = V_ASN1_NULL; 262 263 return 1; 264 } 265 #endif 266