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      1 /* Written by Dr Stephen N Henson (steve (at) openssl.org) for the OpenSSL
      2  * project 2007.
      3  */
      4 /* ====================================================================
      5  * Copyright (c) 2007 The OpenSSL Project.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  *
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  *
     14  * 2. Redistributions in binary form must reproduce the above copyright
     15  *    notice, this list of conditions and the following disclaimer in
     16  *    the documentation and/or other materials provided with the
     17  *    distribution.
     18  *
     19  * 3. All advertising materials mentioning features or use of this
     20  *    software must display the following acknowledgment:
     21  *    "This product includes software developed by the OpenSSL Project
     22  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
     23  *
     24  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
     25  *    endorse or promote products derived from this software without
     26  *    prior written permission. For written permission, please contact
     27  *    licensing (at) OpenSSL.org.
     28  *
     29  * 5. Products derived from this software may not be called "OpenSSL"
     30  *    nor may "OpenSSL" appear in their names without prior written
     31  *    permission of the OpenSSL Project.
     32  *
     33  * 6. Redistributions of any form whatsoever must retain the following
     34  *    acknowledgment:
     35  *    "This product includes software developed by the OpenSSL Project
     36  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
     37  *
     38  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
     39  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     40  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     41  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
     42  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     43  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     44  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     45  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     46  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
     47  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     48  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
     49  * OF THE POSSIBILITY OF SUCH DAMAGE.
     50  * ====================================================================
     51  *
     52  * This product includes cryptographic software written by Eric Young
     53  * (eay (at) cryptsoft.com).  This product includes software written by Tim
     54  * Hudson (tjh (at) cryptsoft.com).
     55  *
     56  */
     57 
     58 #include <stdio.h>
     59 #include "cryptlib.h"
     60 #include <openssl/evp.h>
     61 #include "asn1_locl.h"
     62 
     63 #define HMAC_TEST_PRIVATE_KEY_FORMAT
     64 
     65 /* HMAC "ASN1" method. This is just here to indicate the
     66  * maximum HMAC output length and to free up an HMAC
     67  * key.
     68  */
     69 
     70 static int hmac_size(const EVP_PKEY *pkey)
     71 	{
     72 	return EVP_MAX_MD_SIZE;
     73 	}
     74 
     75 static void hmac_key_free(EVP_PKEY *pkey)
     76 	{
     77 	ASN1_OCTET_STRING *os = (ASN1_OCTET_STRING *)pkey->pkey.ptr;
     78 	if (os)
     79 		{
     80 		if (os->data)
     81 			OPENSSL_cleanse(os->data, os->length);
     82 		ASN1_OCTET_STRING_free(os);
     83 		}
     84 	}
     85 
     86 
     87 static int hmac_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2)
     88 	{
     89 	switch (op)
     90 		{
     91 		case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
     92 		*(int *)arg2 = NID_sha1;
     93 		return 1;
     94 
     95 		default:
     96 		return -2;
     97 		}
     98 	}
     99 
    100 #ifdef HMAC_TEST_PRIVATE_KEY_FORMAT
    101 /* A bogus private key format for test purposes. This is simply the
    102  * HMAC key with "HMAC PRIVATE KEY" in the headers. When enabled the
    103  * genpkey utility can be used to "generate" HMAC keys.
    104  */
    105 
    106 static int old_hmac_decode(EVP_PKEY *pkey,
    107 					const unsigned char **pder, int derlen)
    108 	{
    109 	ASN1_OCTET_STRING *os;
    110 	os = ASN1_OCTET_STRING_new();
    111 	if (!os || !ASN1_OCTET_STRING_set(os, *pder, derlen))
    112 		return 0;
    113 	EVP_PKEY_assign(pkey, EVP_PKEY_HMAC, os);
    114 	return 1;
    115 	}
    116 
    117 static int old_hmac_encode(const EVP_PKEY *pkey, unsigned char **pder)
    118 	{
    119 	int inc;
    120 	ASN1_OCTET_STRING *os = (ASN1_OCTET_STRING *)pkey->pkey.ptr;
    121 	if (pder)
    122 		{
    123 		if (!*pder)
    124 			{
    125 			*pder = OPENSSL_malloc(os->length);
    126 			inc = 0;
    127 			}
    128 		else inc = 1;
    129 
    130 		memcpy(*pder, os->data, os->length);
    131 
    132 		if (inc)
    133 			*pder += os->length;
    134 		}
    135 
    136 	return os->length;
    137 	}
    138 
    139 #endif
    140 
    141 const EVP_PKEY_ASN1_METHOD hmac_asn1_meth =
    142 	{
    143 	EVP_PKEY_HMAC,
    144 	EVP_PKEY_HMAC,
    145 	0,
    146 
    147 	"HMAC",
    148 	"OpenSSL HMAC method",
    149 
    150 	0,0,0,0,
    151 
    152 	0,0,0,
    153 
    154 	hmac_size,
    155 	0,
    156 	0,0,0,0,0,0,0,
    157 
    158 	hmac_key_free,
    159 	hmac_pkey_ctrl,
    160 #ifdef HMAC_TEST_PRIVATE_KEY_FORMAT
    161 	old_hmac_decode,
    162 	old_hmac_encode
    163 #else
    164 	0,0
    165 #endif
    166 	};
    167 
    168