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             : #ifndef BITCOIN_CRYPTO_HMAC_SHA256_H
       6             : #define BITCOIN_CRYPTO_HMAC_SHA256_H
       7             : 
       8             : #include "crypto/sha256.h"
       9             : 
      10             : #include <stdint.h>
      11             : #include <stdlib.h>
      12             : 
      13             : /** A hasher class for HMAC-SHA-512. */
      14             : class CHMAC_SHA256
      15             : {
      16             : private:
      17             :     CSHA256 outer;
      18             :     CSHA256 inner;
      19             : 
      20             : public:
      21             :     static const size_t OUTPUT_SIZE = 32;
      22             : 
      23             :     CHMAC_SHA256(const unsigned char* key, size_t keylen);
      24             :     CHMAC_SHA256& Write(const unsigned char* data, size_t len)
      25             :     {
      26        4440 :         inner.Write(data, len);
      27             :         return *this;
      28             :     }
      29             :     void Finalize(unsigned char hash[OUTPUT_SIZE]);
      30             : };
      31             : 
      32             : #endif // BITCOIN_CRYPTO_HMAC_SHA256_H