sha1.h

/*********************************************************************
* Filename:   sha1.h
* Author:   Brad Conte (brad AT bradconte.com)
* Copyright:
* Disclaimer: This code is presented "as is" without any guarantees.
* Details:  Defines the API for the corresponding SHA1 implementation.
*********************************************************************/

#ifndef SHA1_H
#define SHA1_H

/*************************** HEADER FILES ***************************/
#include <stddef.h>
#include <inttypes.h>

/****************************** MACROS ******************************/
#define SHA1_BLOCK_SIZE 20        // SHA1 outputs a 20 byte digest

/**************************** DATA TYPES ****************************/
typedef uint8_t BYTE;       // 8-bit byte
typedef uint32_t  WORD;       // 32-bit word, change to "long" for 16-bit machines

typedef struct {
  BYTE data[64];
  WORD datalen;
  unsigned long long bitlen;
  WORD state[5];
  WORD k[4];
} SHA1_CTX;

/*********************** FUNCTION DECLARATIONS **********************/
void sha1_init(SHA1_CTX *ctx);
void sha1_update(SHA1_CTX *ctx, const BYTE data[], size_t len);
void sha1_final(SHA1_CTX *ctx, BYTE hash[]);

#endif   // SHA1_H