/**
 * Copyright (c) 2018 - 2020, Nordic Semiconductor ASA
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 * All rights reserved.
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 * are permitted provided that the following conditions are met:
 *
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 *    list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form, except as embedded into a Nordic
 *    Semiconductor ASA integrated circuit in a product or a software update for
 *    such product, must reproduce the above copyright notice, this list of
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 *    materials provided with the distribution.
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 * 3. Neither the name of Nordic Semiconductor ASA nor the names of its
 *    contributors may be used to endorse or promote products derived from this
 *    software without specific prior written permission.
 *
 * 4. This software, with or without modification, must only be used with a
 *    Nordic Semiconductor ASA integrated circuit.
 *
 * 5. Any software provided in binary form under this license must not be reverse
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 */

#include "sdk_common.h"
#if NRF_MODULE_ENABLED(NRF_CRYPTO)

#include <drivers/nrfx_common.h>
#include <stdbool.h>
#include "cc310_backend_mutex.h"
#include "crys_chacha_poly_error.h"
#include "cc310_backend_chacha_poly_aead.h"
#include "cc310_backend_shared.h"
#include "cc310_backend_shared.h"

#if NRF_MODULE_ENABLED(NRF_CRYPTO_CC310_CHACHA_POLY_AEAD)

static ret_code_t result_get(CRYSError_t error)
{
    ret_code_t ret_val;

    switch (error)
    {
        case CRYS_OK:
            ret_val = NRF_SUCCESS;
            break;

        /*! Invalid Additional data. */
        case CRYS_CHACHA_POLY_DATA_INVALID_ERROR:
        case CRYS_CHACHA_POLY_ADATA_INVALID_ERROR:
            ret_val = NRF_ERROR_CRYPTO_INPUT_NULL;
            break;

        /*! Illegal encryption mode. */
        case CRYS_CHACHA_POLY_ENC_MODE_INVALID_ERROR:
            ret_val = NRF_ERROR_CRYPTO_INVALID_PARAM;
            break;

        /*! Illegal data size. */
        case CRYS_CHACHA_POLY_DATA_SIZE_INVALID_ERROR:
            ret_val = NRF_ERROR_CRYPTO_INPUT_LENGTH;
            break;

        /*! MAC comparison error. */
        case CRYS_CHACHA_POLY_MAC_ERROR:
            ret_val = NRF_ERROR_CRYPTO_AEAD_INVALID_MAC;
            break;

        default:
            ret_val = NRF_ERROR_CRYPTO_INTERNAL;
            break;
    }
    return ret_val;
}

static ret_code_t backend_cc310_init(void * const p_context, uint8_t * p_key)
{
    nrf_crypto_backend_chacha_poly_context_t * p_ctx =
        (nrf_crypto_backend_chacha_poly_context_t *)p_context;

    if (!nrfx_is_in_ram(p_ctx))
    {
        return NRF_ERROR_CRYPTO_INPUT_LOCATION;
    }

    if (p_ctx->header.p_info->key_size != NRF_CRYPTO_KEY_SIZE_256)
    {
        return NRF_ERROR_CRYPTO_KEY_SIZE;
    }

    memcpy(p_ctx->key, p_key, sizeof(p_ctx->key));
    return NRF_SUCCESS;
}

static inline ret_code_t backend_cc310_uninit(void * const p_context)
{
    return NRF_SUCCESS;
}

static ret_code_t backend_cc310_crypt(void * const           p_context,
                                      nrf_crypto_operation_t operation,
                                      uint8_t *              p_nonce,
                                      uint8_t                nonce_size,
                                      uint8_t *              p_adata,
                                      size_t                 adata_size,
                                      uint8_t *              p_data_in,
                                      size_t                 data_in_size,
                                      uint8_t *              p_data_out,
                                      uint8_t *              p_mac,
                                      uint8_t                mac_size)

{
    CRYSError_t result;
    ret_code_t  ret_val;
    bool        mutex_locked;

    CRYS_CHACHA_EncryptMode_t operation_cc310;

    nrf_crypto_backend_chacha_poly_context_t * p_ctx =
        (nrf_crypto_backend_chacha_poly_context_t *)p_context;

    mutex_locked = cc310_backend_mutex_trylock();
    VERIFY_TRUE(mutex_locked, NRF_ERROR_CRYPTO_BUSY);

    if ((adata_size == 0) || (data_in_size == 0))
    {
        ret_val = NRF_ERROR_CRYPTO_INPUT_LENGTH;
        goto exit;
    }

    if (mac_size   != NRF_CRYPTO_CHACHA_POLY_MAC_SIZE)
    {
        ret_val = NRF_ERROR_CRYPTO_AEAD_MAC_SIZE;
        goto exit;
    }

    if (nonce_size != NRF_CRYPTO_CHACHA_POLY_NONCE_SIZE)
    {
        ret_val = NRF_ERROR_CRYPTO_AEAD_NONCE_SIZE;
        goto exit;
    }

    if (!nrfx_is_in_ram(p_data_in) || !nrfx_is_in_ram(p_data_out) ||
        !nrfx_is_in_ram(p_mac)          || !nrfx_is_in_ram(p_adata)      ||
        !nrfx_is_in_ram(p_nonce))
    {
        ret_val = NRF_ERROR_CRYPTO_INPUT_LOCATION;
        goto exit;
    }

    if (operation == NRF_CRYPTO_DECRYPT)
    {
        operation_cc310 = CRYS_CHACHA_Decrypt;
    }
    else if (operation == NRF_CRYPTO_ENCRYPT)
    {
        operation_cc310 = CRYS_CHACHA_Encrypt;
    }
    else
    {
        ret_val = NRF_ERROR_CRYPTO_INVALID_PARAM;
        goto exit;
    }

    result = CRYS_CHACHA_POLY(p_nonce,
                              p_ctx->key,
                              operation_cc310,
                              p_adata,
                              adata_size,
                              p_data_in,
                              data_in_size,
                              p_data_out,
                              (uint32_t *)p_mac);

    ret_val = result_get(result);

exit:
    cc310_backend_mutex_unlock();
    return ret_val;
}

nrf_crypto_aead_info_t const g_nrf_crypto_chacha_poly_256_info =
{
    .key_size  = NRF_CRYPTO_KEY_SIZE_256,
    .mode      = NRF_CRYPTO_AEAD_MODE_CHACHA_POLY,

    .init_fn   = backend_cc310_init,
    .uninit_fn = backend_cc310_uninit,
    .crypt_fn  = backend_cc310_crypt
};


#endif // NRF_MODULE_ENABLED(NRF_CRYPTO_CC310_CHACHA_POLY_AEAD)
#endif // NRF_MODULE_ENABLED(NRF_CRYPTO)

