src/crypto/hmac_sha256.h

   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-256. */
  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         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