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diff --git a/src/crypto/hmac-keccak.h b/src/crypto/hmac-keccak.h
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+++ b/src/crypto/hmac-keccak.h
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+// Copyright (c) 2014-2018, The Monero Project
+//
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without modification, are
+// permitted provided that the following conditions are met:
+//
+// 1. Redistributions of source code must retain the above copyright notice, this list of
+//    conditions and the following disclaimer.
+//
+// 2. Redistributions in binary form must reproduce the above copyright notice, this list
+//    of conditions and the following disclaimer in the documentation and/or other
+//    materials provided with the distribution.
+//
+// 3. Neither the name of the copyright holder nor the names of its contributors may be
+//    used to endorse or promote products derived from this software without specific
+//    prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef HMAC_KECCAK_H
+#define HMAC_KECCAK_H
+
+#include "keccak.h"
+
+// HMAC RFC 2104 with Keccak-256 base hash function
+//
+// B = KECCAK_BLOCKLEN = 136 B
+// L = HASH_SIZE = 32 B
+//
+// Note this is not HMAC-SHA3 as SHA3 and Keccak differs in
+// the padding constant.
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct {
+  KECCAK_CTX inner;
+  KECCAK_CTX outer;
+} hmac_keccak_state;
+
+void hmac_keccak_init(hmac_keccak_state *S, const uint8_t *_key, size_t keylen);
+void hmac_keccak_update(hmac_keccak_state *S, const uint8_t *data, size_t datalen);
+void hmac_keccak_finish(hmac_keccak_state *S, uint8_t *digest);
+void hmac_keccak_hash(uint8_t *out, const uint8_t *key, size_t keylen, const uint8_t *in, size_t inlen);
+
+#ifdef __cplusplus
+}
+#endif
+#endif //HMAC_KECCAK_H