/*
 * Copyright © 2007 Pippijn van Steenhoven / The Ermyth Team
 * Rights to this code are as documented in doc/pod/license.pod.
 *
 * Message Digest 5 structures
 *
 * $Id: md5.h,v 1.3 2007/09/05 11:23:13 pippijn Exp $
 */

#ifndef MD5_H
#define MD5_H

/*  The following tests optimise behaviour on little-endian
    machines, where there is no need to reverse the byte order
    of 32 bit words in the MD5 computation.  By default,
    HIGHFIRST is defined, which indicates we're running on a
    big-endian (most significant byte first) machine, on which
    the byteReverse function in md5.c must be invoked. However,
    byteReverse is coded in such a way that it is an identity
    function when run on a little-endian machine, so calling it
    on such a platform causes no harm apart from wasting time. 
    If the platform is known to be little-endian, we speed
    things up by undefining HIGHFIRST, which defines
    byteReverse as a null macro.  Doing things in this manner
    insures we work on new platforms regardless of their byte
    order.  */

#define HIGHFIRST

#ifdef __i386__
#undef HIGHFIRST
#endif

#include <inttypes.h>

struct MD5Context
{
  uint32_t buf[4];
  uint32_t bits[2];
  unsigned char in[64];
};

E void MD5Init (MD5Context *ctx);
E void MD5Update (MD5Context *ctx, unsigned char const *buf, unsigned len);
E void MD5Final (unsigned char digest[16], MD5Context *ctx);
E void MD5Transform (uint32_t buf[4], uint32_t in[16]);

/*
 * This is needed to make RSAREF happy on some MS-DOS compilers.
 */
typedef struct MD5Context MD5_CTX;

/*  Define CHECK_HARDWARE_PROPERTIES to have main,c verify
    byte order and uint32 settings.  */
#define CHECK_HARDWARE_PROPERTIES

#endif /* !MD5_H */