353 lines
11 KiB
C
353 lines
11 KiB
C
/* crypto/bn/bn_lcl.h */
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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#ifndef HEADER_BN_LCL_H
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#define HEADER_BN_LCL_H
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#include <openssl/bn.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Pentium pro 16,16,16,32,64 */
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/* Alpha 16,16,16,16.64 */
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#define BN_MULL_SIZE_NORMAL (16) /* 32 */
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#define BN_MUL_RECURSIVE_SIZE_NORMAL (16) /* 32 less than */
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#define BN_SQR_RECURSIVE_SIZE_NORMAL (16) /* 32 */
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#define BN_MUL_LOW_RECURSIVE_SIZE_NORMAL (32) /* 32 */
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#define BN_MONT_CTX_SET_SIZE_WORD (64) /* 32 */
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#if 0
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#ifndef BN_MUL_COMBA
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/* #define bn_mul_comba8(r,a,b) bn_mul_normal(r,a,8,b,8) */
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/* #define bn_mul_comba4(r,a,b) bn_mul_normal(r,a,4,b,4) */
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#endif
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#ifndef BN_SQR_COMBA
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/* This is probably faster than using the C code - I need to check */
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#define bn_sqr_comba8(r,a) bn_mul_normal(r,a,8,a,8)
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#define bn_sqr_comba4(r,a) bn_mul_normal(r,a,4,a,4)
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#endif
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#endif
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#if !defined(NO_ASM) && !defined(NO_INLINE_ASM) && !defined(PEDANTIC)
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/*
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* BN_UMULT_HIGH section.
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*
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* No, I'm not trying to overwhelm you when stating that the
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* product of N-bit numbers is 2*N bits wide:-) No, I don't expect
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* you to be impressed when I say that if the compiler doesn't
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* support 2*N integer type, then you have to replace every N*N
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* multiplication with 4 (N/2)*(N/2) accompanied by some shifts
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* and additions which unavoidably results in severe performance
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* penalties. Of course provided that the hardware is capable of
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* producing 2*N result... That's when you normally start
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* considering assembler implementation. However! It should be
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* pointed out that some CPUs (most notably Alpha, PowerPC and
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* upcoming IA-64 family:-) provide *separate* instruction
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* calculating the upper half of the product placing the result
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* into a general purpose register. Now *if* the compiler supports
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* inline assembler, then it's not impossible to implement the
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* "bignum" routines (and have the compiler optimize 'em)
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* exhibiting "native" performance in C. That's what BN_UMULT_HIGH
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* macro is about:-)
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*
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* <appro@fy.chalmers.se>
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*/
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# if defined(__alpha) && (defined(SIXTY_FOUR_BIT_LONG) || defined(SIXTY_FOUR_BIT))
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# if defined(__DECC)
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# include <c_asm.h>
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# define BN_UMULT_HIGH(a,b) (BN_ULONG)asm("umulh %a0,%a1,%v0",(a),(b))
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# elif defined(__GNUC__)
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# define BN_UMULT_HIGH(a,b) ({ \
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register BN_ULONG ret; \
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asm ("umulh %1,%2,%0" \
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: "=r"(ret) \
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: "r"(a), "r"(b)); \
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ret; })
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# endif /* compiler */
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# elif defined(_ARCH_PPC) && defined(__64BIT__) && defined(SIXTY_FOUR_BIT_LONG)
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# if defined(__GNUC__)
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# define BN_UMULT_HIGH(a,b) ({ \
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register BN_ULONG ret; \
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asm ("mulhdu %0,%1,%2" \
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: "=r"(ret) \
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: "r"(a), "r"(b)); \
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ret; })
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# endif /* compiler */
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# endif /* cpu */
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#endif /* NO_ASM */
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/*************************************************************
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* Using the long long type
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*/
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#define Lw(t) (((BN_ULONG)(t))&BN_MASK2)
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#define Hw(t) (((BN_ULONG)((t)>>BN_BITS2))&BN_MASK2)
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/* These are used for internal error checking and are not normally used */
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#ifdef BN_DEBUG
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#define bn_check_top(a) \
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{ if (((a)->top < 0) || ((a)->top > (a)->max)) \
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{ char *nullp=NULL; *nullp='z'; } }
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#define bn_check_num(a) if ((a) < 0) { char *nullp=NULL; *nullp='z'; }
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#else
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#define bn_check_top(a)
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#define bn_check_num(a)
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#endif
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/* This macro is to add extra stuff for development checking */
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#ifdef BN_DEBUG
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#define bn_set_max(r) ((r)->max=(r)->top,BN_set_flags((r),BN_FLG_STATIC_DATA))
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#else
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#define bn_set_max(r)
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#endif
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/* These macros are used to 'take' a section of a bignum for read only use */
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#define bn_set_low(r,a,n) \
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{ \
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(r)->top=((a)->top > (n))?(n):(a)->top; \
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(r)->d=(a)->d; \
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(r)->neg=(a)->neg; \
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(r)->flags|=BN_FLG_STATIC_DATA; \
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bn_set_max(r); \
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}
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#define bn_set_high(r,a,n) \
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{ \
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if ((a)->top > (n)) \
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{ \
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(r)->top=(a)->top-n; \
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(r)->d= &((a)->d[n]); \
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} \
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else \
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(r)->top=0; \
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(r)->neg=(a)->neg; \
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(r)->flags|=BN_FLG_STATIC_DATA; \
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bn_set_max(r); \
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}
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/* #define bn_expand(n,b) ((((b)/BN_BITS2) <= (n)->max)?(n):bn_expand2((n),(b))) */
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#ifdef BN_LLONG
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#define mul_add(r,a,w,c) { \
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BN_ULLONG t; \
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t=(BN_ULLONG)w * (a) + (r) + (c); \
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(r)= Lw(t); \
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(c)= Hw(t); \
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}
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#define mul(r,a,w,c) { \
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BN_ULLONG t; \
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t=(BN_ULLONG)w * (a) + (c); \
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(r)= Lw(t); \
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(c)= Hw(t); \
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}
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#define sqr(r0,r1,a) { \
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BN_ULLONG t; \
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t=(BN_ULLONG)(a)*(a); \
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(r0)=Lw(t); \
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(r1)=Hw(t); \
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}
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#elif defined(BN_UMULT_HIGH)
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#define mul_add(r,a,w,c) { \
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BN_ULONG high,low,ret,tmp=(a); \
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ret = (r); \
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high= BN_UMULT_HIGH(w,tmp); \
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ret += (c); \
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low = (w) * tmp; \
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(c) = (ret<(c))?1:0; \
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(c) += high; \
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ret += low; \
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(c) += (ret<low)?1:0; \
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(r) = ret; \
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}
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#define mul(r,a,w,c) { \
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BN_ULONG high,low,ret,ta=(a); \
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low = (w) * ta; \
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high= BN_UMULT_HIGH(w,ta); \
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ret = low + (c); \
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(c) = high; \
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(c) += (ret<low)?1:0; \
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(r) = ret; \
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}
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#define sqr(r0,r1,a) { \
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BN_ULONG tmp=(a); \
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(r0) = tmp * tmp; \
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(r1) = BN_UMULT_HIGH(tmp,tmp); \
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}
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#else
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/*************************************************************
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* No long long type
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*/
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#define LBITS(a) ((a)&BN_MASK2l)
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#define HBITS(a) (((a)>>BN_BITS4)&BN_MASK2l)
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#define L2HBITS(a) ((BN_ULONG)((a)&BN_MASK2l)<<BN_BITS4)
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#define LLBITS(a) ((a)&BN_MASKl)
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#define LHBITS(a) (((a)>>BN_BITS2)&BN_MASKl)
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#define LL2HBITS(a) ((BN_ULLONG)((a)&BN_MASKl)<<BN_BITS2)
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#define mul64(l,h,bl,bh) \
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{ \
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BN_ULONG m,m1,lt,ht; \
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\
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lt=l; \
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ht=h; \
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m =(bh)*(lt); \
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lt=(bl)*(lt); \
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m1=(bl)*(ht); \
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ht =(bh)*(ht); \
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m=(m+m1)&BN_MASK2; if (m < m1) ht+=L2HBITS(1L); \
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ht+=HBITS(m); \
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m1=L2HBITS(m); \
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lt=(lt+m1)&BN_MASK2; if (lt < m1) ht++; \
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(l)=lt; \
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(h)=ht; \
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}
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#define sqr64(lo,ho,in) \
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{ \
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BN_ULONG l,h,m; \
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\
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h=(in); \
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l=LBITS(h); \
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h=HBITS(h); \
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m =(l)*(h); \
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l*=l; \
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h*=h; \
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h+=(m&BN_MASK2h1)>>(BN_BITS4-1); \
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m =(m&BN_MASK2l)<<(BN_BITS4+1); \
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l=(l+m)&BN_MASK2; if (l < m) h++; \
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(lo)=l; \
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(ho)=h; \
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}
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#define mul_add(r,a,bl,bh,c) { \
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BN_ULONG l,h; \
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\
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h= (a); \
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l=LBITS(h); \
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h=HBITS(h); \
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mul64(l,h,(bl),(bh)); \
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\
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/* non-multiply part */ \
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l=(l+(c))&BN_MASK2; if (l < (c)) h++; \
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(c)=(r); \
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l=(l+(c))&BN_MASK2; if (l < (c)) h++; \
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(c)=h&BN_MASK2; \
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(r)=l; \
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}
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#define mul(r,a,bl,bh,c) { \
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BN_ULONG l,h; \
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\
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h= (a); \
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l=LBITS(h); \
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h=HBITS(h); \
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mul64(l,h,(bl),(bh)); \
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\
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/* non-multiply part */ \
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l+=(c); if ((l&BN_MASK2) < (c)) h++; \
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(c)=h&BN_MASK2; \
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(r)=l&BN_MASK2; \
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}
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#endif
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OPENSSL_EXTERN int bn_limit_bits;
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OPENSSL_EXTERN int bn_limit_num; /* (1<<bn_limit_bits) */
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/* Recursive 'low' limit */
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OPENSSL_EXTERN int bn_limit_bits_low;
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OPENSSL_EXTERN int bn_limit_num_low; /* (1<<bn_limit_bits_low) */
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/* Do modified 'high' part calculation' */
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OPENSSL_EXTERN int bn_limit_bits_high;
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OPENSSL_EXTERN int bn_limit_num_high; /* (1<<bn_limit_bits_high) */
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OPENSSL_EXTERN int bn_limit_bits_mont;
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OPENSSL_EXTERN int bn_limit_num_mont; /* (1<<bn_limit_bits_mont) */
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BIGNUM *bn_expand2(BIGNUM *b, int bits);
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void bn_mul_normal(BN_ULONG *r,BN_ULONG *a,int na,BN_ULONG *b,int nb);
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void bn_mul_comba8(BN_ULONG *r,BN_ULONG *a,BN_ULONG *b);
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void bn_mul_comba4(BN_ULONG *r,BN_ULONG *a,BN_ULONG *b);
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void bn_sqr_normal(BN_ULONG *r, BN_ULONG *a, int n, BN_ULONG *tmp);
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void bn_sqr_comba8(BN_ULONG *r,BN_ULONG *a);
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void bn_sqr_comba4(BN_ULONG *r,BN_ULONG *a);
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int bn_cmp_words(BN_ULONG *a,BN_ULONG *b,int n);
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void bn_mul_recursive(BN_ULONG *r,BN_ULONG *a,BN_ULONG *b,int n2,BN_ULONG *t);
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void bn_mul_part_recursive(BN_ULONG *r,BN_ULONG *a,BN_ULONG *b,
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int tn, int n,BN_ULONG *t);
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void bn_sqr_recursive(BN_ULONG *r,BN_ULONG *a, int n2, BN_ULONG *t);
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void bn_mul_low_normal(BN_ULONG *r,BN_ULONG *a,BN_ULONG *b, int n);
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void bn_mul_low_recursive(BN_ULONG *r,BN_ULONG *a,BN_ULONG *b,int n2,
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BN_ULONG *t);
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void bn_mul_high(BN_ULONG *r,BN_ULONG *a,BN_ULONG *b,BN_ULONG *l,int n2,
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BN_ULONG *t);
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#ifdef __cplusplus
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}
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#endif
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#endif
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