#pragma once

#include "Type.h"
#include <stddef.h>
#include <stdint.h>

#define SHA1_DIGEST_SIZE    (20)

/**
 * \brief          SHA-1 context structure
 */
typedef struct {
    uint32_t total[2];          /*!< number of bytes processed  */
    uint32_t state[5];          /*!< intermediate digest state  */
    unsigned char buffer[64];   /*!< data block being processed */
} iot_sha1_context;

/**
 * \brief          Initialize SHA-1 context
 *
 * \param ctx      SHA-1 context to be initialized
 */
void utils_sha1_init(iot_sha1_context* ctx);

/**
 * \brief          Clear SHA-1 context
 *
 * \param ctx      SHA-1 context to be cleared
 */
void utils_sha1_free(iot_sha1_context* ctx);

/**
 * \brief          Clone (the state of) a SHA-1 context
 *
 * \param dst      The destination context
 * \param src      The context to be cloned
 */
void utils_sha1_clone(iot_sha1_context* dst,
    const iot_sha1_context* src);

/**
 * \brief          SHA-1 context setup
 *
 * \param ctx      context to be initialized
 */
void utils_sha1_starts(iot_sha1_context* ctx);

/**
 * \brief          SHA-1 process buffer
 *
 * \param ctx      SHA-1 context
 * \param input    buffer holding the  data
 * \param ilen     length of the input data
 */
void utils_sha1_update(iot_sha1_context* ctx, const unsigned char* input, uint32_t ilen);

/**
 * \brief          SHA-1 final digest
 *
 * \param ctx      SHA-1 context
 * \param output   SHA-1 checksum result
 */
void utils_sha1_finish(iot_sha1_context* ctx, unsigned char output[20]);

/* Internal use */
void utils_sha1_process(iot_sha1_context* ctx, const unsigned char data[64]);

/**
 * \brief          Output = SHA-1( input buffer )
 *
 * \param input    buffer holding the  data
 * \param ilen     length of the input data
 * \param output   SHA-1 checksum result
 */
void utils_sha1(const unsigned char* input, uint32_t ilen, unsigned char output[20]);

void utils_hmac_sha1(const char* msg, int msg_len, char* digest, const char* key, int key_len);
void utils_hmac_sha1_hex(char* msg, int msg_len, byte* digest, char* key, int key_len);