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      1 /* Written by Dr Stephen N Henson (steve (at) openssl.org) for the OpenSSL
      2  * project 2010.
      3  */
      4 /* ====================================================================
      5  * Copyright (c) 2010 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 
     53 #include <stdio.h>
     54 #include "cryptlib.h"
     55 #include <openssl/evp.h>
     56 #include <openssl/cmac.h>
     57 #include "asn1_locl.h"
     58 
     59 /* CMAC "ASN1" method. This is just here to indicate the
     60  * maximum CMAC output length and to free up a CMAC
     61  * key.
     62  */
     63 
     64 static int cmac_size(const EVP_PKEY *pkey)
     65 	{
     66 	return EVP_MAX_BLOCK_LENGTH;
     67 	}
     68 
     69 static void cmac_key_free(EVP_PKEY *pkey)
     70 	{
     71 	CMAC_CTX *cmctx = (CMAC_CTX *)pkey->pkey.ptr;
     72 	if (cmctx)
     73 		CMAC_CTX_free(cmctx);
     74 	}
     75 
     76 const EVP_PKEY_ASN1_METHOD cmac_asn1_meth =
     77 	{
     78 	EVP_PKEY_CMAC,
     79 	EVP_PKEY_CMAC,
     80 	0,
     81 
     82 	"CMAC",
     83 	"OpenSSL CMAC method",
     84 
     85 	0,0,0,0,
     86 
     87 	0,0,0,
     88 
     89 	cmac_size,
     90 	0,
     91 	0,0,0,0,0,0,0,
     92 
     93 	cmac_key_free,
     94 	0,
     95 	0,0
     96 	};
     97 
     98