1 files changed, 32 insertions, 0 deletions
diff --git a/src/crypto/hmac_sha512.h b/src/crypto/hmac_sha512.h
new file mode 100644
index 0000000000..17dee61ea8
--- /dev/null
+++ b/src/crypto/hmac_sha512.h
@@ -0,0 +1,32 @@
+// Copyright (c) 2014 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#ifndef BITCOIN_CRYPTO_HMAC_SHA512_H
+#define BITCOIN_CRYPTO_HMAC_SHA512_H
+
+#include "crypto/sha512.h"
+
+#include <stdint.h>
+#include <stdlib.h>
+
+/** A hasher class for HMAC-SHA-512. */
+class CHMAC_SHA512
+{
+private:
+    CSHA512 outer;
+    CSHA512 inner;
+
+public:
+    static const size_t OUTPUT_SIZE = 64;
+
+    CHMAC_SHA512(const unsigned char* key, size_t keylen);
+    CHMAC_SHA512& Write(const unsigned char* data, size_t len)
+    {
+        inner.Write(data, len);
+        return *this;
+    }
+    void Finalize(unsigned char hash[OUTPUT_SIZE]);
+};
+
+#endif // BITCOIN_CRYPTO_HMAC_SHA512_H