/*
 * This code has been taken from RFC 3174 on 
 * http://ww.rfc-editors.org/
 * File has been renamed to sha1.[hc] to avoid name clash.
 * 
 *  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 _MSC_VER
typedef unsigned __int64  uint64_t;
typedef signed __int64    int64_t;
typedef unsigned __int32  uint32_t;
typedef signed __int32    int32_t;
typedef unsigned __int16  uint16_t;
typedef signed __int16    int16_t;
typedef unsigned __int8   uint8_t;
typedef signed __int8     int8_t;
typedef short int         int_least16_t;
#else
#include <inttypes.h>
#endif

#if defined(_WIN32)
    #pragma warning(disable: 4251)
    #if defined(HLA_EXPORTS)
        #define HLA_EXPORT __declspec(dllexport)
    #else
        #define HLA_EXPORT __declspec(dllimport)
    #endif
#else
    #define HLA_EXPORT
#endif

/* BEGIN_C_DECLS should be used at the beginning of your declarations,
   so that C++ compilers don't mangle their names.  Use END_C_DECLS at
   the end of C declarations. */
#undef BEGIN_C_DECLS
#undef END_C_DECLS
#ifdef __cplusplus
#  define BEGIN_C_DECLS extern "C" {
#  define END_C_DECLS }
#else
# define BEGIN_C_DECLS /* empty */
# define END_C_DECLS /* empty */
#endif

/*
 * If you do not have the ISO standard stdint.h header file, then you
 * must typedef 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 HLA_EXPORT 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;

BEGIN_C_DECLS

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

END_C_DECLS

#endif
