src/core/crypto/aes_ecb.hpp

/*
 *  Copyright (c) 2016, The OpenThread Authors.
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 *     derived from this software without specific prior written permission.
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/**
 * @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
 *
 * @{
 *
 */

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

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

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

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

    /**
     * This method 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_