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// Copyright 2015 The Weave Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef LIBUWEAVE_SRC_CRYPTO_HMAC_H_
#define LIBUWEAVE_SRC_CRYPTO_HMAC_H_
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
typedef struct {
const uint8_t* bytes;
size_t num_bytes;
} UwCryptoHmacMsg;
/**
* Compute HMAC over a list of messages, which is equivalent to computing HMAC
* over the concatenation of all the messages. The HMAC output will be truncated
* to the desired length truncated_digest_len, and written into trucated_digest.
*/
bool uw_crypto_hmac_(const uint8_t* key,
size_t key_len,
const UwCryptoHmacMsg messages[],
size_t num_messages,
uint8_t* truncated_digest,
size_t truncated_digest_len);
#endif // LIBUWEAVE_SRC_CRYPTO_HMAC_H_
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