/*******************************************************************************************
* describe: MD5ʵ��
           
* author: liuyong
* date: 20180828
*******************************************************************************************/

#ifndef __UTL_SHA256_H__
#define __UTL_SHA256_H__

#include <stdint.h>
		
#ifdef __cplusplus
#if __cplusplus
extern "C"{
#endif
#endif /* End of #ifdef __cplusplus */



/*************************** HEADER FILES ***************************/

#include <stddef.h>


/****************************** MACROS ******************************/

#define SHA256_BLOCK_SIZE 32            // SHA256 outputs a 32 byte digest


/**************************** DATA TYPES ****************************/

typedef struct {
	unsigned char data[64];  // current 512-bit chunk of message data, just like a buffer
	unsigned int datalen;   // sign the data length of current chunk
	unsigned long long bitlen;  // the bit length of the total message
	unsigned int state[8];  // store the middle state of hash abstract
} SHA256_CTX;


/*********************** FUNCTION DECLARATIONS **********************/

void sha256_init(SHA256_CTX *ctx);
void sha256_update(SHA256_CTX *ctx, const unsigned char data[], size_t len);
void sha256_final(SHA256_CTX *ctx, unsigned char hash[]);


#ifdef __cplusplus
#if __cplusplus
}
#endif
#endif /* End of #ifdef __cplusplus */

#endif /* End of #ifndef __M_MD5_H__ */