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/*
* Local defines for the md5 functions.
*
* $Id$
*/
/*
* Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
* rights reserved.
*
* License to copy and use this software is granted provided that it is
* identified as the "RSA Data Security, Inc. MD5 Message-Digest
* Algorithm" in all material mentioning or referencing this software
* or this function.
*
* License is also granted to make and use derivative works provided that
* such works are identified as "derived from the RSA Data Security,
* Inc. MD5 Message-Digest Algorithm" in all material mentioning or
* referencing the derived work.
*
* RSA Data Security, Inc. makes no representations concerning either the
* merchantability of this software or the suitability of this
* software for any particular purpose. It is provided "as is" without
* express or implied warranty of any kind.
*
* These notices must be retained in any copies of any part of this
* documentation and/or software.
*/
#ifndef __MD5_LOC_H__
#define __MD5_LOC_H__
#define HEX_STRING "0123456789abcdef" /* to convert to hex */
#define BLOCK_SIZE_MASK (MD5_BLOCK_SIZE - 1)
/*
* Define my endian-ness. Could not do in a portable manner using the
* include files -- grumble.
*/
#if defined(__alpha) || defined(WIN32) || defined(__i386__)
/*
* little endian
*/
#define SWAP(n) (n)
#endif
#ifdef __sparc
/*
* big endian - big is better
*/
#define SWAP(n) \
(((n) << 24) | (((n) & 0xff00) << 8) | (((n) >> 8) & 0xff00) | ((n) >> 24))
#endif
/*
* These are the four functions used in the four steps of the MD5
* algorithm and defined in the RFC 1321. The first function is a
* little bit optimized (as found in Colin Plumbs public domain
* implementation).
*/
/* #define FF(b, c, d) ((b & c) | (~b & d)) */
#define FF(b, c, d) (d ^ (b & (c ^ d)))
#define FG(b, c, d) FF(d, b, c)
#define FH(b, c, d) (b ^ c ^ d)
#define FI(b, c, d) (c ^ (b | ~d))
/*
* It is unfortunate that C does not provide an operator for cyclic
* rotation. Hope the C compiler is smart enough. -- Modified to
* remove the w = at the front - Gray 2/97
*/
#define CYCLIC(w, s) ((w << s) | (w >> (32 - s)))
/*
* First Round: using the given function, the context and a constant
* the next context is computed. Because the algorithms processing
* unit is a 32-bit word and it is determined to work on words in
* little endian byte order we perhaps have to change the byte order
* before the computation. To reduce the work for the next steps we
* store the swapped words in the array CORRECT_WORDS. -- Modified to
* fix the handling of unaligned buffer spaces - Gray 7/97
*/
#define OP1(a, b, c, d, b_p, c_p, s, T) \
do { \
memcpy(c_p, b_p, sizeof(md5_uint32)); \
*c_p = SWAP(*c_p); \
a += FF (b, c, d) + *c_p + T; \
a = CYCLIC (a, s); \
a += b; \
b_p = (char *)b_p + sizeof(md5_uint32); \
c_p++; \
} while (0)
/*
* Second to Fourth Round: we have the possibly swapped words in
* CORRECT_WORDS. Redefine the macro to take an additional first
* argument specifying the function to use.
*/
#define OP234(FUNC, a, b, c, d, k, s, T) \
do { \
a += FUNC (b, c, d) + k + T; \
a = CYCLIC (a, s); \
a += b; \
} while (0)
#endif /* ! __MD5_LOC_H__ */
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