/*
 *  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_

/*
 * We assume that the standard asterisk headers have been included before this one.
 * 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)
 *
 */

#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

/*!
 * \brief 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   */
    uint32_t Message_Block_Index;	/*!< 8 bits actually suffice */
    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
