/*
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 *     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.
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 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 *  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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/**
 * @file
 *   This file implements SHA-256.
 */

#include "sha256.hpp"

#include "common/debug.hpp"
#include "common/error.hpp"
#include "common/message.hpp"

namespace ot {
namespace Crypto {

Sha256::Sha256(void)
{
    mContext.mContext     = mContextStorage;
    mContext.mContextSize = sizeof(mContextStorage);
    SuccessOrAssert(otPlatCryptoSha256Init(&mContext));
}

Sha256::~Sha256(void) { SuccessOrAssert(otPlatCryptoSha256Deinit(&mContext)); }

void Sha256::Start(void) { SuccessOrAssert(otPlatCryptoSha256Start(&mContext)); }

void Sha256::Update(const void *aBuf, uint16_t aBufLength)
{
    SuccessOrAssert(otPlatCryptoSha256Update(&mContext, aBuf, aBufLength));
}

void Sha256::Update(const Message &aMessage, uint16_t aOffset, uint16_t aLength)
{
    Message::Chunk chunk;

    aMessage.GetFirstChunk(aOffset, aLength, chunk);

    while (chunk.GetLength() > 0)
    {
        Update(chunk.GetBytes(), chunk.GetLength());
        aMessage.GetNextChunk(aLength, chunk);
    }
}

void Sha256::Finish(Hash &aHash) { SuccessOrAssert(otPlatCryptoSha256Finish(&mContext, aHash.m8, Hash::kSize)); }

} // namespace Crypto
} // namespace ot