lib/libcrypto/hmac/hm_ameth.c

   1 /* $OpenBSD: hm_ameth.c,v 1.10 2015/09/10 15:56:25 jsing Exp $ */
   2 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
   3  * project 2007.
   4  */
   5 /* ====================================================================
   6  * Copyright (c) 2007 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 <string.h>
  61
  62 #include <openssl/evp.h>
  63
  64 #include "asn1_locl.h"
  65
  66 #define HMAC_TEST_PRIVATE_KEY_FORMAT
  67
  68 /* HMAC "ASN1" method. This is just here to indicate the
  69  * maximum HMAC output length and to free up an HMAC
  70  * key.
  71  */
  72
  73 static int
  74 hmac_size(const EVP_PKEY *pkey)
  75 {
  76         return EVP_MAX_MD_SIZE;
  77 }
  78
  79 static void
  80 hmac_key_free(EVP_PKEY *pkey)
  81 {
  82         ASN1_OCTET_STRING *os = (ASN1_OCTET_STRING *)pkey->pkey.ptr;
  83
  84         if (os) {
  85                 if (os->data)
  86                         explicit_bzero(os->data, os->length);
  87                 ASN1_OCTET_STRING_free(os);
  88         }
  89 }
  90
  91 static int
  92 hmac_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2)
  93 {
  94         switch (op) {
  95         case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
  96                 *(int *)arg2 = NID_sha1;
  97                 return 1;
  98         default:
  99                 return -2;
 100         }
 101 }
 102
 103 #ifdef HMAC_TEST_PRIVATE_KEY_FORMAT
 104 /* A bogus private key format for test purposes. This is simply the
 105  * HMAC key with "HMAC PRIVATE KEY" in the headers. When enabled the
 106  * genpkey utility can be used to "generate" HMAC keys.
 107  */
 108
 109 static int
 110 old_hmac_decode(EVP_PKEY *pkey, const unsigned char **pder, int derlen)
 111 {
 112         ASN1_OCTET_STRING *os;
 113
 114         os = ASN1_OCTET_STRING_new();
 115         if (os == NULL)
 116                 goto err;
 117         if (ASN1_OCTET_STRING_set(os, *pder, derlen) == 0)
 118                 goto err;
 119         if (EVP_PKEY_assign(pkey, EVP_PKEY_HMAC, os) == 0)
 120                 goto err;
 121         return 1;
 122
 123 err:
 124         ASN1_OCTET_STRING_free(os);
 125         return 0;
 126 }
 127
 128 static int
 129 old_hmac_encode(const EVP_PKEY *pkey, unsigned char **pder)
 130 {
 131         int inc;
 132         ASN1_OCTET_STRING *os = (ASN1_OCTET_STRING *)pkey->pkey.ptr;
 133
 134         if (pder) {
 135                 if (!*pder) {
 136                         *pder = malloc(os->length);
 137                         if (*pder == NULL)
 138                                 return -1;
 139                         inc = 0;
 140                 } else
 141                         inc = 1;
 142
 143                 memcpy(*pder, os->data, os->length);
 144
 145                 if (inc)
 146                         *pder += os->length;
 147         }
 148
 149         return os->length;
 150 }
 151
 152 #endif
 153
 154 const EVP_PKEY_ASN1_METHOD hmac_asn1_meth = {
 155         .pkey_id = EVP_PKEY_HMAC,
 156         .pkey_base_id = EVP_PKEY_HMAC,
 157
 158         .pem_str = "HMAC",
 159         .info = "OpenSSL HMAC method",
 160
 161         .pkey_size = hmac_size,
 162
 163         .pkey_free = hmac_key_free,
 164         .pkey_ctrl = hmac_pkey_ctrl,
 165 #ifdef HMAC_TEST_PRIVATE_KEY_FORMAT
 166         .old_priv_decode = old_hmac_decode,
 167         .old_priv_encode = old_hmac_encode
 168 #endif
 169 };