/*
 * category: [algorithm]
 * apply status:
 * edit status:
 * build status:
 * description:
 */

#ifndef __MD5_H__
#define __MD5_H__

#pragma once

#include "config.h"

#ifdef __cplusplus
extern "C" {
#endif

#include <stdlib.h>
#include <stdint.h>

#define MD5_DIGESTSIZE 16

typedef struct md5_ctx_t md5_ctx_t;

/** MD5 context. */
struct md5_ctx_t {
    /** state (ABCD) */
    uint32_t state[4];
    /** number of bits, modulo 2^64 (lsb first) */
    uint32_t count[2];
    /** input buffer */
    unsigned char buffer[64];
};

TOOLKIT_API int md5_init(md5_ctx_t *context);

/**
 * MD5 block update operation.  Continue an MD5 message-digest operation, 
 * processing another message block, and updating the context.
 * @param context The MD5 content to update.
 * @param input next message block to update
 * @param inputLen The length of the next message block
 */
TOOLKIT_API int md5_update(md5_ctx_t *context,const void *input,size_t inputLen);

/**
 * MD5 finalization.  Ends an MD5 message-digest operation, writing the 
 * message digest and zeroing the context
 * @param digest The final MD5 digest
 * @param context The MD5 content we are finalizing.
 */
TOOLKIT_API int md5_final(unsigned char digest[MD5_DIGESTSIZE],md5_ctx_t *context);

/**
 * MD5 in one step
 * @param digest The final MD5 digest
 * @param input The message block to use
 * @param inputLen The length of the message block
 */
TOOLKIT_API int md5(unsigned char digest[MD5_DIGESTSIZE],const void *input,size_t inputLen);

#ifdef __cplusplus
} // extern "C" {
#endif

#endif // __MD5_H__