/*
 * Copyright (C) 2013, 2016 Apple Inc. 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.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS 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 APPLE INC. OR ITS 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.
 */

#pragma once

#include <wtf/Noncopyable.h>
#include <wtf/Vector.h>
#include <wtf/text/WTFString.h>

namespace PAL {

struct CryptoDigestContext;
enum class UseCryptoKit : bool { No, Yes };

class CryptoDigest {
    WTF_MAKE_NONCOPYABLE(CryptoDigest);
    WTF_MAKE_FAST_ALLOCATED;
public:
    enum class Algorithm {
        SHA_1,
        SHA_224,
        SHA_256,
        SHA_384,
        SHA_512,
    };
    PAL_EXPORT static std::unique_ptr<CryptoDigest> create(Algorithm);
    PAL_EXPORT ~CryptoDigest();

    PAL_EXPORT void addBytes(std::span<const uint8_t>);
    PAL_EXPORT Vector<uint8_t> computeHash();
    PAL_EXPORT String toHexString();
    PAL_EXPORT static std::optional<Vector<uint8_t>> computeHash(Algorithm, const Vector<uint8_t>&, UseCryptoKit);
    PAL_EXPORT CryptoDigest();

private:
    std::unique_ptr<CryptoDigestContext> m_context;
};

} // namespace PAL
