sha1.h

/*
 *	sha1.h
 *
 *	Description:
 *		This is the header file for code which implements the Secure
 *		Hashing Algorithm 1 as defined in FIPS PUB 180-1 published
 *		April 17, 1995.
 *
 *		Many of the variable names in this code, especially the
 *		single character names, were used because those were the names
 *		used in the publication.
 *
 *		Please read the file sha1.c for more information.
 *
 */

#ifndef _SHA1_H_
#define _SHA1_H_

#include <stdint.h>
/*
 * If you do not have the ISO standard stdint.h header file, then you
 * must typdef the following:
 *	  name				meaning
 *	uint32_t		 unsigned 32 bit integer
 *	uint8_t			 unsigned 8 bit integer (i.e., unsigned char)
 *	int_least16_t	 integer of >= 16 bits
 *
 */

#ifndef _SHA_enum_
#define _SHA_enum_
enum
{
	shaSuccess = 0,
	shaNull,			/* Null pointer parameter */
	shaInputTooLong,	/* input data too long */
	shaStateError		/* called Input after Result */
};
#endif
#define SHA1HashSize 20

/*
 *	This structure will hold context information for the SHA-1
 *	hashing operation
 */
typedef struct SHA1Context
{
	uint32_t Intermediate_Hash[SHA1HashSize/4]; /* Message Digest  */
	uint32_t Length_Low;			/* Message length in bits	   */
	uint32_t Length_High;			/* Message length in bits	   */
							   /* Index into message block array   */
	int_least16_t Message_Block_Index;
	uint8_t Message_Block[64];		/* 512-bit message blocks	   */
	int Computed;				/* Is the digest computed?		   */
	int Corrupted;			   /* Is the message digest corrupted? */
} SHA1Context;

/*
 *	Function Prototypes
 */

int SHA1Reset(SHA1Context *);
int SHA1Input(SHA1Context *, const uint8_t *, unsigned int);
int SHA1Result(SHA1Context *, uint8_t Message_Digest[SHA1HashSize]);

#endif