lib/libcrypto/pkcs12/p12_mutl.c

   1 /* $OpenBSD: p12_mutl.c,v 1.23 2017/01/29 17:49:23 beck 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 /* Generate a MAC */
  72 int
  73 PKCS12_gen_mac(PKCS12 *p12, const char *pass, int passlen,
  74     unsigned char *mac, unsigned int *maclen)
  75 {
  76         const EVP_MD *md_type;
  77         HMAC_CTX hmac;
  78         unsigned char key[EVP_MAX_MD_SIZE], *salt;
  79         int saltlen, iter;
  80         int md_size;
  81
  82         if (!PKCS7_type_is_data(p12->authsafes)) {
  83                 PKCS12error(PKCS12_R_CONTENT_TYPE_NOT_DATA);
  84                 return 0;
  85         }
  86
  87         salt = p12->mac->salt->data;
  88         saltlen = p12->mac->salt->length;
  89         if (!p12->mac->iter)
  90                 iter = 1;
  91         else if ((iter = ASN1_INTEGER_get(p12->mac->iter)) <= 0) {
  92                 PKCS12error(PKCS12_R_DECODE_ERROR);
  93                 return 0;
  94         }
  95         if (!(md_type = EVP_get_digestbyobj(
  96             p12->mac->dinfo->algor->algorithm))) {
  97                 PKCS12error(PKCS12_R_UNKNOWN_DIGEST_ALGORITHM);
  98                 return 0;
  99         }
 100         md_size = EVP_MD_size(md_type);
 101         if (md_size < 0)
 102                 return 0;
 103         if (!PKCS12_key_gen(pass, passlen, salt, saltlen, PKCS12_MAC_ID, iter,
 104             md_size, key, md_type)) {
 105                 PKCS12error(PKCS12_R_KEY_GEN_ERROR);
 106                 return 0;
 107         }
 108         HMAC_CTX_init(&hmac);
 109         if (!HMAC_Init_ex(&hmac, key, md_size, md_type, NULL) ||
 110             !HMAC_Update(&hmac, p12->authsafes->d.data->data,
 111             p12->authsafes->d.data->length) ||
 112             !HMAC_Final(&hmac, mac, maclen)) {
 113                 HMAC_CTX_cleanup(&hmac);
 114                 return 0;
 115         }
 116         HMAC_CTX_cleanup(&hmac);
 117         return 1;
 118 }
 119
 120 /* Verify the mac */
 121 int
 122 PKCS12_verify_mac(PKCS12 *p12, const char *pass, int passlen)
 123 {
 124         unsigned char mac[EVP_MAX_MD_SIZE];
 125         unsigned int maclen;
 126
 127         if (p12->mac == NULL) {
 128                 PKCS12error(PKCS12_R_MAC_ABSENT);
 129                 return 0;
 130         }
 131         if (!PKCS12_gen_mac(p12, pass, passlen, mac, &maclen)) {
 132                 PKCS12error(PKCS12_R_MAC_GENERATION_ERROR);
 133                 return 0;
 134         }
 135         if ((maclen != (unsigned int)p12->mac->dinfo->digest->length) ||
 136             memcmp(mac, p12->mac->dinfo->digest->data, maclen))
 137                 return 0;
 138         return 1;
 139 }
 140
 141 /* Set a mac */
 142
 143 int
 144 PKCS12_set_mac(PKCS12 *p12, const char *pass, int passlen, unsigned char *salt,
 145     int saltlen, int iter, const EVP_MD *md_type)
 146 {
 147         unsigned char mac[EVP_MAX_MD_SIZE];
 148         unsigned int maclen;
 149
 150         if (!md_type)
 151                 md_type = EVP_sha1();
 152         if (PKCS12_setup_mac(p12, iter, salt, saltlen, md_type) ==
 153             PKCS12_ERROR) {
 154                 PKCS12error(PKCS12_R_MAC_SETUP_ERROR);
 155                 return 0;
 156         }
 157         if (!PKCS12_gen_mac(p12, pass, passlen, mac, &maclen)) {
 158                 PKCS12error(PKCS12_R_MAC_GENERATION_ERROR);
 159                 return 0;
 160         }
 161         if (!(ASN1_STRING_set(p12->mac->dinfo->digest, mac, maclen))) {
 162                 PKCS12error(PKCS12_R_MAC_STRING_SET_ERROR);
 163                 return 0;
 164         }
 165         return 1;
 166 }
 167
 168 /* Set up a mac structure */
 169 int
 170 PKCS12_setup_mac(PKCS12 *p12, int iter, unsigned char *salt, int saltlen,
 171     const EVP_MD *md_type)
 172 {
 173         if (!(p12->mac = PKCS12_MAC_DATA_new()))
 174                 return PKCS12_ERROR;
 175         if (iter > 1) {
 176                 if (!(p12->mac->iter = ASN1_INTEGER_new())) {
 177                         PKCS12error(ERR_R_MALLOC_FAILURE);
 178                         return 0;
 179                 }
 180                 if (!ASN1_INTEGER_set(p12->mac->iter, iter)) {
 181                         PKCS12error(ERR_R_MALLOC_FAILURE);
 182                         return 0;
 183                 }
 184         }
 185         if (!saltlen)
 186                 saltlen = PKCS12_SALT_LEN;
 187         if (!(p12->mac->salt->data = malloc(saltlen))) {
 188                 PKCS12error(ERR_R_MALLOC_FAILURE);
 189                 return 0;
 190         }
 191         p12->mac->salt->length = saltlen;
 192         if (!salt)
 193                 arc4random_buf(p12->mac->salt->data, saltlen);
 194         else
 195                 memcpy (p12->mac->salt->data, salt, saltlen);
 196         p12->mac->dinfo->algor->algorithm = OBJ_nid2obj(EVP_MD_type(md_type));
 197         if (!(p12->mac->dinfo->algor->parameter = ASN1_TYPE_new())) {
 198                 PKCS12error(ERR_R_MALLOC_FAILURE);
 199                 return 0;
 200         }
 201         p12->mac->dinfo->algor->parameter->type = V_ASN1_NULL;
 202
 203         return 1;
 204 }
 205 #endif