crypto/cmac/cm_ameth.c

   1 /*
   2  * Copyright 2010-2016 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include <stdio.h>
  11 #include "internal/cryptlib.h"
  12 #include <openssl/evp.h>
  13 #include <openssl/cmac.h>
  14 #include "internal/asn1_int.h"
  15
  16 /*
  17  * CMAC "ASN1" method. This is just here to indicate the maximum CMAC output
  18  * length and to free up a CMAC key.
  19  */
  20
  21 static int cmac_size(const EVP_PKEY *pkey)
  22 {
  23     return EVP_MAX_BLOCK_LENGTH;
  24 }
  25
  26 static void cmac_key_free(EVP_PKEY *pkey)
  27 {
  28     CMAC_CTX *cmctx = EVP_PKEY_get0(pkey);
  29     CMAC_CTX_free(cmctx);
  30 }
  31
  32 const EVP_PKEY_ASN1_METHOD cmac_asn1_meth = {
  33     EVP_PKEY_CMAC,
  34     EVP_PKEY_CMAC,
  35     0,
  36
  37     "CMAC",
  38     "OpenSSL CMAC method",
  39
  40     0, 0, 0, 0,
  41
  42     0, 0, 0,
  43
  44     cmac_size,
  45     0, 0,
  46     0, 0, 0, 0, 0, 0, 0,
  47
  48     cmac_key_free,
  49     0,
  50     0, 0
  51 };