189 lines
6.3 KiB
C
189 lines
6.3 KiB
C
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/* $NetBSD: lbn.h,v 1.1.1.1 2001/01/27 08:07:57 itojun Exp $ */
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/*
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* Cylink Corporation <EFBFBD> 1998
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*
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* This software is licensed by Cylink to the Internet Software Consortium to
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* promote implementation of royalty free public key cryptography within IETF
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* standards. Cylink wishes to expressly thank the contributions of Dr.
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* Martin Hellman, Whitfield Diffie, Ralph Merkle and Stanford University for
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* their contributions to Internet Security. In accordance with the terms of
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* this license, ISC is authorized to distribute and sublicense this software
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* for the practice of IETF standards.
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*
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* The software includes BigNum, written by Colin Plumb and licensed by Philip
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* R. Zimmermann for royalty free use and distribution with Cylink's
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* software. Use of BigNum as a stand alone product or component is
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* specifically prohibited.
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*
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* Disclaimer of All Warranties. THIS SOFTWARE IS BEING PROVIDED "AS IS",
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* WITHOUT ANY EXPRESSED OR IMPLIED WARRANTY OF ANY KIND WHATSOEVER. IN
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* PARTICULAR, WITHOUT LIMITATION ON THE GENERALITY OF THE FOREGOING, CYLINK
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* MAKES NO REPRESENTATION OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR
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* PURPOSE.
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*
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* Cylink or its representatives shall not be liable for tort, indirect,
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* special or consequential damages such as loss of profits or loss of
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* goodwill from the use or inability to use the software for any purpose or
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* for any reason whatsoever.
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*
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* EXPORT LAW: Export of the Foundations Suite may be subject to compliance
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* with the rules and regulations promulgated from time to time by the Bureau
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* of Export Administration, United States Department of Commerce, which
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* restrict the export and re-export of certain products and technical data.
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* If the export of the Foundations Suite is controlled under such rules and
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* regulations, then the Foundations Suite shall not be exported or
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* re-exported, directly or indirectly, (a) without all export or re-export
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* licenses and governmental approvals required by any applicable laws, or (b)
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* in violation of any applicable prohibition against the export or re-export
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* of any part of the Foundations Suite. All export licenses for software
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* containing the Foundations Suite are the sole responsibility of the licensee.
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*/
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/*
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* lbn.h - Low-level bignum header.
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* Defines various word sizes and useful macros.
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*
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* Copyright (c) 1995 Colin Plumb. All rights reserved.
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* For licensing and other legal details, see the file legal.c.
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*/
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#ifndef LBN_H
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#define LBN_H
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#ifndef HAVE_CONFIG_H
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#define HAVE_CONFIG_H 0
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#endif
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#if HAVE_CONFIG_H
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#include "config.h"
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#endif
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/*
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* Some compilers complain about #if FOO if FOO isn't defined,
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* so do the ANSI-mandated thing explicitly...
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*/
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#ifndef NO_LIMITS_H
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#define NO_LIMITS_H 0
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#endif
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/* Make sure we have 8-bit bytes */
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#if !NO_LIMITS_H
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#include <limits.h>
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#if UCHAR_MAX != 0xff || CHAR_BIT != 8
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#error The bignum library requires 8-bit unsigned characters.
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#endif
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#endif /* !NO_LIMITS_H */
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#ifdef BNINCLUDE /* If this is defined as, say, foo.h */
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#define STR(x) #x /* STR(BNINCLUDE) -> "BNINCLUDE" */
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#define XSTR(x) STR(x) /* XSTR(BNINCLUDE) -> STR(foo.h) -> "foo.h" */
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#include XSTR(BNINCLUDE) /* #include "foo.h" */
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#undef XSTR
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#undef STR
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#endif
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/* Figure out the endianness */
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/* Error if more than one is defined */
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#if BN_BIG_ENDIAN && BN_LITTLE_ENDIAN
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#error Only one of BN_BIG_ENDIAN or BN_LITTLE_ENDIAN may be defined
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#endif
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/*
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* If no preference is stated, little-endian C code is slightly more
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* efficient, so prefer that. (The endianness here does NOT have to
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* match the machine's native byte sex; the library's C code will work
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* either way. The flexibility is allowed for assembly routines
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* that do care.
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*/
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#if !defined(BN_BIG_ENDIAN) && !defined(BN_LITTLE_ENDIAN)
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#define BN_LITTLE_ENDIAN 1
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#endif /* !BN_BIG_ENDIAN && !BN_LITTLE_ENDIAN */
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/* Macros to choose between big and little endian */
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#if BN_BIG_ENDIAN
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#define BIG(b) b
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#define LITTLE(l) /*nothing*/
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#define BIGLITTLE(b,l) b
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#elif BN_LITTLE_ENDIAN
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#define BIG(b) /*nothing*/
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#define LITTLE(l) l
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#define BIGLITTLE(b,l) l
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#else
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#error One of BN_BIG_ENDIAN or BN_LITTLE_ENDIAN must be defined as 1
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#endif
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/*
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* Find a 16-bit unsigned type.
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* Unsigned short is preferred over unsigned int to make the type chosen
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* by this file more stable on platforms (such as many 68000 compilers)
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* which support both 16- and 32-bit ints.
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*/
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#ifndef BNWORD16
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#ifndef USHRT_MAX /* No <limits.h> available - guess */
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typedef unsigned short bnword16;
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#define BNWORD16 bnword16
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#elif USHRT_MAX == 0xffff
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typedef unsigned short bnword16;
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#define BNWORD16 bnword16
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#elif UINT_MAX == 0xffff
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typedef unsigned bnword16;
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#define BNWORD16 bnword16
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#endif
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#endif /* BNWORD16 */
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/*
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* Find a 32-bit unsigned type.
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* Unsigned long is preferred over unsigned int to make the type chosen
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* by this file more stable on platforms (such as many 68000 compilers)
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* which support both 16- and 32-bit ints.
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*/
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#ifndef BNWORD32
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#ifndef ULONG_MAX /* No <limits.h> available - guess */
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typedef unsigned long bnword32;
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#define BNWORD32 bnword32
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#elif ULONG_MAX == 0xfffffffful
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typedef unsigned long bnword32;
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#define BNWORD32 bnword32
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#elif UINT_MAX == 0xffffffff
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typedef unsigned bnword32;
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#define BNWORD32 bnword32
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#elif USHRT_MAX == 0xffffffff
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typedef unsigned short bnword32;
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#define BNWORD32 bnword32
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#endif
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#endif /* BNWORD16 */
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/*
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* Find a 64-bit unsigned type.
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* The conditions here are more complicated to avoid using numbers that
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* will choke lesser preprocessors (like 0xffffffffffffffff) unless
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* we're reasonably certain that they'll be acceptable.
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*/
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#if !defined(BNWORD64) && ULONG_MAX > 0xfffffffful
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#if ULONG_MAX == 0xffffffffffffffff
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typedef unsigned long bnword64;
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#define BNWORD64 bnword64
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#endif
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#endif
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#if 0
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/*
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* I would test the value of unsigned long long, but some *preprocessors*
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* don't constants that long even if the compiler can accept them, so it
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* doesn't work reliably. So cross our fingers and hope that it's a 64-bit
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* type.
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*
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* GCC uses ULONG_LONG_MAX. Solaris uses ULLONG_MAX. IRIX uses ULONGLONG_MAX.
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* Are there any other names for this?
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*/
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#if !defined(BNWORD64) && \
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(defined(ULONG_LONG_MAX) || defined (ULLONG_MAX) || defined(ULONGLONG_MAX))
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typedef unsigned long long bnword64;
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#define BNWORD64 bnword64
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#endif
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#endif
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/* We don't even try to find a 128-bit type at the moment */
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#endif /* !LBN_H */
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