/*
 *  Copyright (c) 2016, The OpenThread Authors.
 *  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.
 *  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.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT HOLDER OR 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
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 *  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 *  POSSIBILITY OF SUCH DAMAGE.
 */

/**
 * @file
 *   This file includes definitions for performing AES-ECB computations.
 */

#ifndef AES_ECB_HPP_
#define AES_ECB_HPP_

#include "openthread-core-config.h"

#include <openthread/platform/crypto.h>

#include "common/code_utils.hpp"
#include "crypto/context_size.hpp"
#include "crypto/storage.hpp"

namespace ot {
namespace Crypto {

/**
 * @addtogroup core-security
 *
 * @{
 *
 */

/**
 * Implements AES ECB computation.
 *
 */
class AesEcb
{
public:
    static constexpr uint8_t kBlockSize = 16; ///< AES-128 block size (bytes).

    /**
     * Constructor to initialize the AES operation.
     *
     */
    AesEcb(void);

    /**
     * Destructor to free the AES context.
     *
     */
    ~AesEcb(void);

    /**
     * Sets the key.
     *
     * @param[in]  aKey     Crypto Key used for ECB operation
     *
     */
    void SetKey(const Key &aKey);

    /**
     * Encrypts data.
     *
     * @param[in]   aInput   A pointer to the input buffer.
     * @param[out]  aOutput  A pointer to the output buffer.
     *
     */
    void Encrypt(const uint8_t aInput[kBlockSize], uint8_t aOutput[kBlockSize]);

private:
    otCryptoContext mContext;
    OT_DEFINE_ALIGNED_VAR(mContextStorage, kAesContextSize, uint64_t);
};

/**
 * @}
 *
 */

} // namespace Crypto
} // namespace ot

#endif // AES_ECB_HPP_