Line data    Source code

       1             : // Copyright (c) 2014-2018 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_sha256.h>
       6             : 
       7             : #include <string.h>
       8             : 
       9           0 : CHMAC_SHA256::CHMAC_SHA256(const unsigned char* key, size_t keylen)
      10             : {
      11             :     unsigned char rkey[64];
      12           0 :     if (keylen <= 64) {
      13           0 :         memcpy(rkey, key, keylen);
      14           0 :         memset(rkey + keylen, 0, 64 - keylen);
      15           0 :     } else {
      16           0 :         CSHA256().Write(key, keylen).Finalize(rkey);
      17           0 :         memset(rkey + 32, 0, 32);
      18             :     }
      19             : 
      20           0 :     for (int n = 0; n < 64; n++)
      21           0 :         rkey[n] ^= 0x5c;
      22           0 :     outer.Write(rkey, 64);
      23             : 
      24           0 :     for (int n = 0; n < 64; n++)
      25           0 :         rkey[n] ^= 0x5c ^ 0x36;
      26           0 :     inner.Write(rkey, 64);
      27           0 : }
      28             : 
      29           0 : void CHMAC_SHA256::Finalize(unsigned char hash[OUTPUT_SIZE])
      30             : {
      31             :     unsigned char temp[32];
      32           0 :     inner.Finalize(temp);
      33           0 :     outer.Write(temp, 32).Finalize(hash);
      34           0 : }