/* crypto/bn/bn_lcl.h */

/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)

 * All rights reserved.

 *

 * This package is an SSL implementation written

 * by Eric Young (eay@cryptsoft.com).

 * The implementation was written so as to conform with Netscapes SSL.

 * 

 * This library is free for commercial and non-commercial use as long as

 * the following conditions are aheared to.  The following conditions

 * apply to all code found in this distribution, be it the RC4, RSA,

 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation

 * included with this distribution is covered by the same copyright terms

 * except that the holder is Tim Hudson (tjh@cryptsoft.com).

 * 

 * Copyright remains Eric Young's, and as such any Copyright notices in

 * the code are not to be removed.

 * If this package is used in a product, Eric Young should be given attribution

 * as the author of the parts of the library used.

 * This can be in the form of a textual message at program startup or

 * in documentation (online or textual) provided with the package.

 * 

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 * 1. Redistributions of source code must retain the copyright

 *    notice, this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in the

 *    documentation and/or other materials provided with the distribution.

 * 3. All advertising materials mentioning features or use of this software

 *    must display the following acknowledgement:

 *    "This product includes cryptographic software written by

 *     Eric Young (eay@cryptsoft.com)"

 *    The word 'cryptographic' can be left out if the rouines from the library

 *    being used are not cryptographic related :-).

 * 4. If you include any Windows specific code (or a derivative thereof) from 

 *    the apps directory (application code) you must include an acknowledgement:

 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"

 * 

 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND

 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE

 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

 * SUCH DAMAGE.

 * 

 * The licence and distribution terms for any publically available version or

 * derivative of this code cannot be changed.  i.e. this code cannot simply be

 * copied and put under another distribution licence

 * [including the GNU Public Licence.]

 */

/* ====================================================================

 * Copyright (c) 1998-2000 The OpenSSL Project.  All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer. 

 *

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in

 *    the documentation and/or other materials provided with the

 *    distribution.

 *

 * 3. All advertising materials mentioning features or use of this

 *    software must display the following acknowledgment:

 *    "This product includes software developed by the OpenSSL Project

 *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"

 *

 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to

 *    endorse or promote products derived from this software without

 *    prior written permission. For written permission, please contact

 *    openssl-core@openssl.org.

 *

 * 5. Products derived from this software may not be called "OpenSSL"

 *    nor may "OpenSSL" appear in their names without prior written

 *    permission of the OpenSSL Project.

 *

 * 6. Redistributions of any form whatsoever must retain the following

 *    acknowledgment:

 *    "This product includes software developed by the OpenSSL Project

 *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"

 *

 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY

 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR

 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;

 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,

 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED

 * OF THE POSSIBILITY OF SUCH DAMAGE.

 * ====================================================================

 *

 * This product includes cryptographic software written by Eric Young

 * (eay@cryptsoft.com).  This product includes software written by Tim

 * Hudson (tjh@cryptsoft.com).

 *

 */

#ifndef HEADER_BN_LCL_H

#define HEADER_BN_LCL_H

#include <openssl/bn.h>

#ifdef  __cplusplus

extern "C" {

#endif

/*

 * BN_window_bits_for_exponent_size -- macro for sliding window mod_exp functions

 *

 *

 * For window size 'w' (w >= 2) and a random 'b' bits exponent,

 * the number of multiplications is a constant plus on average

 *

 *    2^(w-1) + (b-w)/(w+1);

 *

 * here  2^(w-1)  is for precomputing the table (we actually need

 * entries only for windows that have the lowest bit set), and

 * (b-w)/(w+1)  is an approximation for the expected number of

 * w-bit windows, not counting the first one.

 *

 * Thus we should use

 *

 *    w >= 6  if        b > 671

 *     w = 5  if  671 > b > 239

 *     w = 4  if  239 > b >  79

 *     w = 3  if   79 > b >  23

 *    w <= 2  if   23 > b

 *

 * (with draws in between).  Very small exponents are often selected

 * with low Hamming weight, so we use  w = 1  for b <= 23.

 */

#if 1

#define BN_window_bits_for_exponent_size(b) \

		((b) > 671 ? 6 : \

		 (b) > 239 ? 5 : \

		 (b) >  79 ? 4 : \

		 (b) >  23 ? 3 : 1)

#else

/* Old SSLeay/OpenSSL table.

 * Maximum window size was 5, so this table differs for b==1024;

 * but it coincides for other interesting values (b==160, b==512).

 */

#define BN_window_bits_for_exponent_size(b) \

		((b) > 255 ? 5 : \

		 (b) > 127 ? 4 : \

		 (b) >  17 ? 3 : 1)

#endif	 

/* BN_mod_exp_mont_conttime is based on the assumption that the

 * L1 data cache line width of the target processor is at least

 * the following value.

 */

#define MOD_EXP_CTIME_MIN_CACHE_LINE_WIDTH	( 64 )

#define MOD_EXP_CTIME_MIN_CACHE_LINE_MASK	(MOD_EXP_CTIME_MIN_CACHE_LINE_WIDTH - 1)

/* Window sizes optimized for fixed window size modular exponentiation

 * algorithm (BN_mod_exp_mont_consttime).

 *

 * To achieve the security goals of BN_mode_exp_mont_consttime, the

 * maximum size of the window must not exceed

 * log_2(MOD_EXP_CTIME_MIN_CACHE_LINE_WIDTH). 

 *

 * Window size thresholds are defined for cache line sizes of 32 and 64,

 * cache line sizes where log_2(32)=5 and log_2(64)=6 respectively. A

 * window size of 7 should only be used on processors that have a 128

 * byte or greater cache line size.

 */

#if MOD_EXP_CTIME_MIN_CACHE_LINE_WIDTH == 64

#  define BN_window_bits_for_ctime_exponent_size(b) \

		((b) > 937 ? 6 : \

		 (b) > 306 ? 5 : \

		 (b) >  89 ? 4 : \

		 (b) >  22 ? 3 : 1)

#  define BN_MAX_WINDOW_BITS_FOR_CTIME_EXPONENT_SIZE	(6)

#elif MOD_EXP_CTIME_MIN_CACHE_LINE_WIDTH == 32

#  define BN_window_bits_for_ctime_exponent_size(b) \

		((b) > 306 ? 5 : \

		 (b) >  89 ? 4 : \

		 (b) >  22 ? 3 : 1)

#  define BN_MAX_WINDOW_BITS_FOR_CTIME_EXPONENT_SIZE	(5)

#endif

/* Pentium pro 16,16,16,32,64 */

/* Alpha       16,16,16,16.64 */

#define BN_MULL_SIZE_NORMAL			(16) /* 32 */

#define BN_MUL_RECURSIVE_SIZE_NORMAL		(16) /* 32 less than */

#define BN_SQR_RECURSIVE_SIZE_NORMAL		(16) /* 32 */

#define BN_MUL_LOW_RECURSIVE_SIZE_NORMAL	(32) /* 32 */

#define BN_MONT_CTX_SET_SIZE_WORD		(64) /* 32 */

#if !defined(OPENSSL_NO_ASM) && !defined(OPENSSL_NO_INLINE_ASM) && !defined(PEDANTIC)

/*

 * BN_UMULT_HIGH section.

 *

 * No, I'm not trying to overwhelm you when stating that the

 * product of N-bit numbers is 2*N bits wide:-) No, I don't expect

 * you to be impressed when I say that if the compiler doesn't

 * support 2*N integer type, then you have to replace every N*N

 * multiplication with 4 (N/2)*(N/2) accompanied by some shifts

 * and additions which unavoidably results in severe performance

 * penalties. Of course provided that the hardware is capable of

 * producing 2*N result... That's when you normally start

 * considering assembler implementation. However! It should be

 * pointed out that some CPUs (most notably Alpha, PowerPC and

 * upcoming IA-64 family:-) provide *separate* instruction

 * calculating the upper half of the product placing the result

 * into a general purpose register. Now *if* the compiler supports

 * inline assembler, then it's not impossible to implement the

 * "bignum" routines (and have the compiler optimize 'em)

 * exhibiting "native" performance in C. That's what BN_UMULT_HIGH

 * macro is about:-)

 *

 *					<appro@fy.chalmers.se>

 */

# if defined(__alpha) && (defined(SIXTY_FOUR_BIT_LONG) || defined(SIXTY_FOUR_BIT))

#  if defined(__DECC)

#   include <c_asm.h>

#   define BN_UMULT_HIGH(a,b)	(BN_ULONG)asm("umulh %a0,%a1,%v0",(a),(b))

#  elif defined(__GNUC__)

#   define BN_UMULT_HIGH(a,b)	({	\

	register BN_ULONG ret;		\

	asm ("umulh	%1,%2,%0"	\

	     : "=r"(ret)		\

	     : "r"(a), "r"(b));		\

	ret;			})

#  endif	/* compiler */

# elif defined(_ARCH_PPC) && defined(__64BIT__) && defined(SIXTY_FOUR_BIT_LONG)

#  if defined(__GNUC__)

#   define BN_UMULT_HIGH(a,b)	({	\

	register BN_ULONG ret;		\

	asm ("mulhdu	%0,%1,%2"	\

	     : "=r"(ret)		\

	     : "r"(a), "r"(b));		\

	ret;			})

#  endif	/* compiler */

# elif defined(__x86_64) && defined(SIXTY_FOUR_BIT_LONG)

#  if defined(__GNUC__)

#   define BN_UMULT_HIGH(a,b)	({	\

	register BN_ULONG ret,discard;	\

	asm ("mulq	%3"		\

	     : "=a"(discard),"=d"(ret)	\

	     : "a"(a), "g"(b)		\

	     : "cc");			\

	ret;			})

#   define BN_UMULT_LOHI(low,high,a,b)	\

	asm ("mulq	%3"		\

		: "=a"(low),"=d"(high)	\

		: "a"(a),"g"(b)		\

		: "cc");

#  endif

# elif (defined(_M_AMD64) || defined(_M_X64)) && defined(SIXTY_FOUR_BIT)

#  if defined(_MSC_VER) && _MSC_VER>=1400

    unsigned __int64 __umulh	(unsigned __int64 a,unsigned __int64 b);

    unsigned __int64 _umul128	(unsigned __int64 a,unsigned __int64 b,

				 unsigned __int64 *h);

#   pragma intrinsic(__umulh,_umul128)

#   define BN_UMULT_HIGH(a,b)		__umulh((a),(b))

#   define BN_UMULT_LOHI(low,high,a,b)	((low)=_umul128((a),(b),&(high)))

#  endif

# endif		/* cpu */

#endif		/* OPENSSL_NO_ASM */

/*************************************************************

 * Using the long long type

 */

#define Lw(t)    (((BN_ULONG)(t))&BN_MASK2)

#define Hw(t)    (((BN_ULONG)((t)>>BN_BITS2))&BN_MASK2)

#ifdef BN_DEBUG_RAND

#define bn_clear_top2max(a) \

	{ \

	int      ind = (a)->dmax - (a)->top; \

	BN_ULONG *ftl = &(a)->d[(a)->top-1]; \

	for (; ind != 0; ind--) \

		*(++ftl) = 0x0; \

	}

#else

#define bn_clear_top2max(a)

#endif

#ifdef BN_LLONG

#define mul_add(r,a,w,c) { \

	BN_ULLONG t; \

	t=(BN_ULLONG)w * (a) + (r) + (c); \

	(r)= Lw(t); \

	(c)= Hw(t); \

	}

#define mul(r,a,w,c) { \

	BN_ULLONG t; \

	t=(BN_ULLONG)w * (a) + (c); \

	(r)= Lw(t); \

	(c)= Hw(t); \

	}

#define sqr(r0,r1,a) { \

	BN_ULLONG t; \

	t=(BN_ULLONG)(a)*(a); \

	(r0)=Lw(t); \

	(r1)=Hw(t); \

	}

#elif defined(BN_UMULT_LOHI)

#define mul_add(r,a,w,c) {		\

	BN_ULONG high,low,ret,tmp=(a);	\

	ret =  (r);			\

	BN_UMULT_LOHI(low,high,w,tmp);	\

	ret += (c);			\

	(c) =  (ret<(c))?1:0;		\

	(c) += high;			\

	ret += low;			\

	(c) += (ret<low)?1:0;		\

	(r) =  ret;			\

	}

#define mul(r,a,w,c)	{		\

	BN_ULONG high,low,ret,ta=(a);	\

	BN_UMULT_LOHI(low,high,w,ta);	\

	ret =  low + (c);		\

	(c) =  high;			\

	(c) += (ret<low)?1:0;		\

	(r) =  ret;			\

	}

#define sqr(r0,r1,a)	{		\

	BN_ULONG tmp=(a);		\

	BN_UMULT_LOHI(r0,r1,tmp,tmp);	\

	}

#elif defined(BN_UMULT_HIGH)

#define mul_add(r,a,w,c) {		\

	BN_ULONG high,low,ret,tmp=(a);	\

	ret =  (r);			\

	high=  BN_UMULT_HIGH(w,tmp);	\

	ret += (c);			\

	low =  (w) * tmp;		\

	(c) =  (ret<(c))?1:0;		\

	(c) += high;			\

	ret += low;			\

	(c) += (ret<low)?1:0;		\

	(r) =  ret;			\

	}

#define mul(r,a,w,c)	{		\

	BN_ULONG high,low,ret,ta=(a);	\

	low =  (w) * ta;		\

	high=  BN_UMULT_HIGH(w,ta);	\

	ret =  low + (c);		\

	(c) =  high;			\

	(c) += (ret<low)?1:0;		\

	(r) =  ret;			\

	}

#define sqr(r0,r1,a)	{		\

	BN_ULONG tmp=(a);		\

	(r0) = tmp * tmp;		\

	(r1) = BN_UMULT_HIGH(tmp,tmp);	\

	}

#else

/*************************************************************

 * No long long type

 */

#define LBITS(a)	((a)&BN_MASK2l)

#define HBITS(a)	(((a)>>BN_BITS4)&BN_MASK2l)

#define	L2HBITS(a)	(((a)<<BN_BITS4)&BN_MASK2)

#define LLBITS(a)	((a)&BN_MASKl)

#define LHBITS(a)	(((a)>>BN_BITS2)&BN_MASKl)

#define	LL2HBITS(a)	((BN_ULLONG)((a)&BN_MASKl)<<BN_BITS2)

#define mul64(l,h,bl,bh) \

	{ \

	BN_ULONG m,m1,lt,ht; \

 \

	lt=l; \

	ht=h; \

	m =(bh)*(lt); \

	lt=(bl)*(lt); \

	m1=(bl)*(ht); \

	ht =(bh)*(ht); \

	m=(m+m1)&BN_MASK2; if (m < m1) ht+=L2HBITS((BN_ULONG)1); \

	ht+=HBITS(m); \

	m1=L2HBITS(m); \

	lt=(lt+m1)&BN_MASK2; if (lt < m1) ht++; \

	(l)=lt; \

	(h)=ht; \

	}

#define sqr64(lo,ho,in) \

	{ \

	BN_ULONG l,h,m; \

 \

	h=(in); \

	l=LBITS(h); \

	h=HBITS(h); \

	m =(l)*(h); \

	l*=l; \

	h*=h; \

	h+=(m&BN_MASK2h1)>>(BN_BITS4-1); \

	m =(m&BN_MASK2l)<<(BN_BITS4+1); \

	l=(l+m)&BN_MASK2; if (l < m) h++; \

	(lo)=l; \

	(ho)=h; \

	}

#define mul_add(r,a,bl,bh,c) { \

	BN_ULONG l,h; \

 \

	h= (a); \

	l=LBITS(h); \

	h=HBITS(h); \

	mul64(l,h,(bl),(bh)); \

 \

	/* non-multiply part */ \

	l=(l+(c))&BN_MASK2; if (l < (c)) h++; \

	(c)=(r); \

	l=(l+(c))&BN_MASK2; if (l < (c)) h++; \

	(c)=h&BN_MASK2; \

	(r)=l; \

	}

#define mul(r,a,bl,bh,c) { \

	BN_ULONG l,h; \

 \

	h= (a); \

	l=LBITS(h); \

	h=HBITS(h); \

	mul64(l,h,(bl),(bh)); \

 \

	/* non-multiply part */ \

	l+=(c); if ((l&BN_MASK2) < (c)) h++; \

	(c)=h&BN_MASK2; \

	(r)=l&BN_MASK2; \

	}

#endif /* !BN_LLONG */

void bn_mul_normal(BN_ULONG *r,BN_ULONG *a,int na,BN_ULONG *b,int nb);

IMPORT_C void bn_mul_comba8(BN_ULONG *r,BN_ULONG *a,BN_ULONG *b);

IMPORT_C void bn_mul_comba4(BN_ULONG *r,BN_ULONG *a,BN_ULONG *b);

void bn_sqr_normal(BN_ULONG *r, const BN_ULONG *a, int n, BN_ULONG *tmp);

IMPORT_C void bn_sqr_comba8(BN_ULONG *r,const BN_ULONG *a);

IMPORT_C void bn_sqr_comba4(BN_ULONG *r,const BN_ULONG *a);

IMPORT_C int bn_cmp_words(const BN_ULONG *a,const BN_ULONG *b,int n);

IMPORT_C int bn_cmp_part_words(const BN_ULONG *a, const BN_ULONG *b,

	int cl, int dl);

void bn_mul_recursive(BN_ULONG *r,BN_ULONG *a,BN_ULONG *b,int n2,

	int dna,int dnb,BN_ULONG *t);

void bn_mul_part_recursive(BN_ULONG *r,BN_ULONG *a,BN_ULONG *b,

	int n,int tna,int tnb,BN_ULONG *t);

void bn_sqr_recursive(BN_ULONG *r,const BN_ULONG *a, int n2, BN_ULONG *t);

void bn_mul_low_normal(BN_ULONG *r,BN_ULONG *a,BN_ULONG *b, int n);

void bn_mul_low_recursive(BN_ULONG *r,BN_ULONG *a,BN_ULONG *b,int n2,

	BN_ULONG *t);

void bn_mul_high(BN_ULONG *r,BN_ULONG *a,BN_ULONG *b,BN_ULONG *l,int n2,

	BN_ULONG *t);

BN_ULONG bn_add_part_words(BN_ULONG *r, const BN_ULONG *a, const BN_ULONG *b,

	int cl, int dl);

BN_ULONG bn_sub_part_words(BN_ULONG *r, const BN_ULONG *a, const BN_ULONG *b,

	int cl, int dl);

#ifdef  __cplusplus

}

#endif

#endif