/*
 *  PSA AEAD driver entry points
 */
/*
 *  Copyright The Mbed TLS Contributors
 *  SPDX-License-Identifier: Apache-2.0
 *
 *  Licensed under the Apache License, Version 2.0 (the "License"); you may
 *  not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

#ifndef PSA_CRYPTO_AEAD_H
#define PSA_CRYPTO_AEAD_H

#include <psa/crypto.h>

/**
 * \brief Process an authenticated encryption operation.
 *
 * \note The signature of this function is that of a PSA driver
 *       aead_encrypt entry point. This function behaves as an aead_encrypt
 *       entry point as defined in the PSA driver interface specification for
 *       transparent drivers.
 *
 * \param[in]  attributes         The attributes of the key to use for the
 *                                operation.
 * \param[in]  key_buffer         The buffer containing the key context.
 * \param      key_buffer_size    Size of the \p key_buffer buffer in bytes.
 * \param      alg                The AEAD algorithm to compute.
 * \param[in]  nonce              Nonce or IV to use.
 * \param      nonce_length       Size of the nonce buffer in bytes. This must
 *                                be appropriate for the selected algorithm.
 *                                The default nonce size is
 *                                PSA_AEAD_NONCE_LENGTH(key_type, alg) where
 *                                key_type is the type of key.
 * \param[in]  additional_data    Additional data that will be authenticated
 *                                but not encrypted.
 * \param      additional_data_length  Size of additional_data in bytes.
 * \param[in]  plaintext          Data that will be authenticated and encrypted.
 * \param      plaintext_length   Size of plaintext in bytes.
 * \param[out] ciphertext         Output buffer for the authenticated and
 *                                encrypted data. The additional data is not
 *                                part of this output. For algorithms where the
 *                                encrypted data and the authentication tag are
 *                                defined as separate outputs, the
 *                                authentication tag is appended to the
 *                                encrypted data.
 * \param      ciphertext_size    Size of the ciphertext buffer in bytes. This
 *                                must be appropriate for the selected algorithm
 *                                and key:
 *                                - A sufficient output size is
 *                                  PSA_AEAD_ENCRYPT_OUTPUT_SIZE(key_type, alg,
 *                                  plaintext_length) where key_type is the type
 *                                  of key.
 *                                - PSA_AEAD_ENCRYPT_OUTPUT_MAX_SIZE(
 *                                  plaintext_length) evaluates to the maximum
 *                                  ciphertext size of any supported AEAD
 *                                  encryption.
 * \param[out] ciphertext_length  On success, the size of the output in the
 *                                ciphertext buffer.
 *
 * \retval #PSA_SUCCESS Success.
 * \retval #PSA_ERROR_NOT_SUPPORTED
 *         \p alg is not supported.
 * \retval #PSA_ERROR_INSUFFICIENT_MEMORY
 * \retval #PSA_ERROR_BUFFER_TOO_SMALL
 *         ciphertext_size is too small.
 * \retval #PSA_ERROR_CORRUPTION_DETECTED
 */
psa_status_t mbedtls_psa_aead_encrypt(
    const psa_key_attributes_t *attributes,
    const uint8_t *key_buffer, size_t key_buffer_size,
    psa_algorithm_t alg,
    const uint8_t *nonce, size_t nonce_length,
    const uint8_t *additional_data, size_t additional_data_length,
    const uint8_t *plaintext, size_t plaintext_length,
    uint8_t *ciphertext, size_t ciphertext_size, size_t *ciphertext_length );

/**
 * \brief Process an authenticated decryption operation.
 *
 * \note The signature of this function is that of a PSA driver
 *       aead_decrypt entry point. This function behaves as an aead_decrypt
 *       entry point as defined in the PSA driver interface specification for
 *       transparent drivers.
 *
 * \param[in]  attributes         The attributes of the key to use for the
 *                                operation.
 * \param[in]  key_buffer         The buffer containing the key context.
 * \param      key_buffer_size    Size of the \p key_buffer buffer in bytes.
 * \param      alg                The AEAD algorithm to compute.
 * \param[in]  nonce              Nonce or IV to use.
 * \param      nonce_length       Size of the nonce buffer in bytes. This must
 *                                be appropriate for the selected algorithm.
 *                                The default nonce size is
 *                                PSA_AEAD_NONCE_LENGTH(key_type, alg) where
 *                                key_type is the type of key.
 * \param[in]  additional_data    Additional data that has been authenticated
 *                                but not encrypted.
 * \param      additional_data_length  Size of additional_data in bytes.
 * \param[in]  ciphertext         Data that has been authenticated and
 *                                encrypted. For algorithms where the encrypted
 *                                data and the authentication tag are defined
 *                                as separate inputs, the buffer contains
 *                                encrypted data followed by the authentication
 *                                tag.
 * \param      ciphertext_length  Size of ciphertext in bytes.
 * \param[out] plaintext          Output buffer for the decrypted data.
 * \param      plaintext_size     Size of the plaintext buffer in bytes. This
 *                                must be appropriate for the selected algorithm
 *                                and key:
 *                                - A sufficient output size is
 *                                  PSA_AEAD_DECRYPT_OUTPUT_SIZE(key_type, alg,
 *                                  ciphertext_length) where key_type is the
 *                                  type of key.
 *                                - PSA_AEAD_DECRYPT_OUTPUT_MAX_SIZE(
 *                                  ciphertext_length) evaluates to the maximum
 *                                  plaintext size of any supported AEAD
 *                                  decryption.
 * \param[out] plaintext_length   On success, the size of the output in the
 *                                plaintext buffer.
 *
 * \retval #PSA_SUCCESS Success.
 * \retval #PSA_ERROR_INVALID_SIGNATURE
 *         The cipher is not authentic.
 * \retval #PSA_ERROR_NOT_SUPPORTED
 *         \p alg is not supported.
 * \retval #PSA_ERROR_INSUFFICIENT_MEMORY
 * \retval #PSA_ERROR_BUFFER_TOO_SMALL
 *         plaintext_size is too small.
 * \retval #PSA_ERROR_CORRUPTION_DETECTED
 */
psa_status_t mbedtls_psa_aead_decrypt(
    const psa_key_attributes_t *attributes,
    const uint8_t *key_buffer, size_t key_buffer_size,
    psa_algorithm_t alg,
    const uint8_t *nonce, size_t nonce_length,
    const uint8_t *additional_data, size_t additional_data_length,
    const uint8_t *ciphertext, size_t ciphertext_length,
    uint8_t *plaintext, size_t plaintext_size, size_t *plaintext_length );

#endif /* PSA_CRYPTO_AEAD */
