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/usr/include/bitcoin/utility/ripemd.hpp is in libbitcoin-dev 2.0-2.4.

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/*
 * Copyright (c) 2011-2013 libbitcoin developers (see AUTHORS)
 *
 * This file is part of libbitcoin.
 *
 * libbitcoin is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License with
 * additional permissions to the one published by the Free Software
 * Foundation, either version 3 of the License, or (at your option) 
 * any later version. For more information see LICENSE.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
#ifndef LIBBITCOIN_RIPEMD_HPP
#define LIBBITCOIN_RIPEMD_HPP

#include <openssl/ripemd.h>
#include <cstdint>

#include <bitcoin/types.hpp>

namespace libbitcoin {

constexpr size_t ripemd_digest_size = RIPEMD160_DIGEST_LENGTH;
static_assert(ripemd_digest_size == 20, "RIPEMD160_DIGEST_LENGTH not defined correctly!");

short_hash generate_ripemd_hash(const data_chunk& chunk);

} // namespace libbitcoin

#endif