Line data    Source code

       1             : // Copyright (c) 2014 The Bitcoin Core developers
       2             : // Distributed under the MIT software license, see the accompanying
       3             : // file COPYING or http://www.opensource.org/licenses/mit-license.php.
       4             : 
       5             : #include "crypto/hmac_sha512.h"
       6             : 
       7             : #include <string.h>
       8             : 
       9          28 : CHMAC_SHA512::CHMAC_SHA512(const unsigned char* key, size_t keylen)
      10             : {
      11             :     unsigned char rkey[128];
      12          28 :     if (keylen <= 128) {
      13             :         memcpy(rkey, key, keylen);
      14          26 :         memset(rkey + keylen, 0, 128 - keylen);
      15             :     } else {
      16           2 :         CSHA512().Write(key, keylen).Finalize(rkey);
      17             :         memset(rkey + 64, 0, 64);
      18             :     }
      19             : 
      20        3584 :     for (int n = 0; n < 128; n++)
      21        3584 :         rkey[n] ^= 0x5c;
      22          28 :     outer.Write(rkey, 128);
      23             : 
      24        3584 :     for (int n = 0; n < 128; n++)
      25        3584 :         rkey[n] ^= 0x5c ^ 0x36;
      26          28 :     inner.Write(rkey, 128);
      27          28 : }
      28             : 
      29        2418 : void CHMAC_SHA512::Finalize(unsigned char hash[OUTPUT_SIZE])
      30             : {
      31             :     unsigned char temp[64];
      32        2418 :     inner.Finalize(temp);
      33        2418 :     outer.Write(temp, 64).Finalize(hash);
      34        2418 : }