// Copyright 2020 Espressif Systems (Shanghai) PTE LTD
//
// 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

#pragma once

#include "esp_rom_md5.h"

#ifdef __cplusplus
extern "C" {
#endif

#if CONFIG_IDF_TARGET_ESP32C2
typedef struct mbedtls_md5_context mbedtls_md5_context;
#else
typedef struct MD5Context mbedtls_md5_context;
#endif

/**
 * \brief          Initialize MD5 context
 *
 * \param ctx      MD5 context to be initialized
 *
 * \warning        MD5 is considered a weak message digest and its use
 *                 constitutes a security risk. We recommend considering
 *                 stronger message digests instead.
 *
 */
int esp_md5_init_ret( mbedtls_md5_context *ctx );

/**
 * \brief          Clear MD5 context
 *
 * \param ctx      MD5 context to be cleared
 *
 * \warning        MD5 is considered a weak message digest and its use
 *                 constitutes a security risk. We recommend considering
 *                 stronger message digests instead.
 *
 */
void esp_md5_free( mbedtls_md5_context *ctx );

/**
 * \brief          Clone (the state of) an MD5 context
 *
 * \param dst      The destination context
 * \param src      The context to be cloned
 *
 * \warning        MD5 is considered a weak message digest and its use
 *                 constitutes a security risk. We recommend considering
 *                 stronger message digests instead.
 *
 */
void esp_md5_clone( mbedtls_md5_context *dst, const mbedtls_md5_context *src );

/**
 * \brief          MD5 process buffer
 *
 * \param ctx      MD5 context
 * \param input    buffer holding the data
 * \param ilen     length of the input data
 *
 * \return         0 if successful
 *
 * \warning        MD5 is considered a weak message digest and its use
 *                 constitutes a security risk. We recommend considering
 *                 stronger message digests instead.
 *
 */
int esp_md5_update_ret( mbedtls_md5_context *ctx, const unsigned char *input, size_t ilen );

/**
 * \brief          MD5 final digest
 *
 * \param ctx      MD5 context
 * \param output   MD5 checksum result
 *
 * \return         0 if successful
 *
 * \warning        MD5 is considered a weak message digest and its use
 *                 constitutes a security risk. We recommend considering
 *                 stronger message digests instead.
 *
 */
int esp_md5_finish_ret( mbedtls_md5_context *ctx, unsigned char output[16] );

/**
 * \brief          MD5 process data block (internal use only)
 *
 * \param ctx      MD5 context
 * \param data     buffer holding one block of data
 *
 * \return         0 if successful
 *
 * \warning        MD5 is considered a weak message digest and its use
 *                 constitutes a security risk. We recommend considering
 *                 stronger message digests instead.
 *
 */
int esp_md5_process( mbedtls_md5_context *ctx, const unsigned char data[64] );

/**
 * \brief          MD5 context setup
 *
 * \deprecated     Superseded by mbedtls_md5_starts_ret() in 2.7.0
 *
 * \param ctx      context to be initialized
 *
 * \warning        MD5 is considered a weak message digest and its use
 *                 constitutes a security risk. We recommend considering
 *                 stronger message digests instead.
 *
 */
void esp_md5_init( mbedtls_md5_context *ctx );

/**
 * \brief          MD5 process buffer
 *
 * \deprecated     Superseded by mbedtls_md5_update_ret() in 2.7.0
 *
 * \param ctx      MD5 context
 * \param input    buffer holding the data
 * \param ilen     length of the input data
 *
 * \warning        MD5 is considered a weak message digest and its use
 *                 constitutes a security risk. We recommend considering
 *                 stronger message digests instead.
 *
 */
void esp_md5_update( mbedtls_md5_context *ctx, const unsigned char *input, size_t ilen );

/**
 * \brief          MD5 final digest
 *
 * \deprecated     Superseded by mbedtls_md5_finish_ret() in 2.7.0
 *
 * \param ctx      MD5 context
 * \param output   MD5 checksum result
 *
 * \warning        MD5 is considered a weak message digest and its use
 *                 constitutes a security risk. We recommend considering
 *                 stronger message digests instead.
 *
 */
void esp_md5_finish( mbedtls_md5_context *ctx, unsigned char output[16] );

#ifdef __cplusplus
}
#endif