/*
 *  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