/*
 *  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_

#ifdef __cplusplus
extern "C" {
#endif

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

/*
 *  This structure will hold context information for the SHA-1
 *  hashing operation
 */
typedef struct SHA1Context
{
    unsigned long Intermediate_Hash[20/4];              /* Message Digest */

    unsigned long Length_Low;                   /* Message length in bits */
    unsigned long Length_High;                  /* Message length in bits */

    int Message_Block_Index;            /* Index into message block array */
    unsigned char 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 unsigned char *,
                unsigned int);
int SHA1Result( SHA1Context *,
                unsigned char Message_Digest[20]);

#if defined( SHA1_TEST )
int SHA1Test( );
#endif // SHA1_TEST


#ifdef __cplusplus
}
#endif

#endif // _SHA1_H_