Hmac.h

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/*
 *  Copyright (c) 2018-present, Facebook, Inc.
 *  All rights reserved.
 *
 *  This source code is licensed under the BSD-style license found in the
 *  LICENSE file in the root directory of this source tree.
 */

#pragma once

namespace fizz {

class Hmac {
 public:
  virtual ~Hmac() = default;

  virtual size_t length() const = 0;

  virtual void hmac(
      folly::ByteRange key,
      const folly::IOBuf& in,
      folly::MutableByteRange out) const = 0;
};

template <typename Hash>
class HmacImpl : public Hmac {
 public:
  size_t length() const override {
    return Hash::HashLen;
  }

  void hmac(
      folly::ByteRange key,
      const folly::IOBuf& in,
      folly::MutableByteRange out) const override {
    return Hash::hmac(key, in, out);
  }
}
} // namespace fizz