Delete bundled copy of OpenSSL and replace with README.

openssl/crypto/bn/bn_div.c

Index: openssl/crypto/bn/bn_div.c
diff --git a/openssl/crypto/bn/bn_div.c b/openssl/crypto/bn/bn_div.c
deleted file mode 100644
index 7b2403185e6279f2111128eb6183744ffd3157c6..0000000000000000000000000000000000000000
--- a/openssl/crypto/bn/bn_div.c
+++ /dev/null
@@ -1,448 +0,0 @@
-/* crypto/bn/bn_div.c */
-/* 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.]
- */
-
-#include <stdio.h>
-#include <openssl/bn.h>
-#include "cryptlib.h"
-#include "bn_lcl.h"
-
-
-/* The old slow way */
-#if 0
-int BN_div(BIGNUM *dv, BIGNUM *rem, const BIGNUM *m, const BIGNUM *d,
-	   BN_CTX *ctx)
-	{
-	int i,nm,nd;
-	int ret = 0;
-	BIGNUM *D;
-
-	bn_check_top(m);
-	bn_check_top(d);
-	if (BN_is_zero(d))
-		{
-		BNerr(BN_F_BN_DIV,BN_R_DIV_BY_ZERO);
-		return(0);
-		}
-
-	if (BN_ucmp(m,d) < 0)
-		{
-		if (rem != NULL)
-			{ if (BN_copy(rem,m) == NULL) return(0); }
-		if (dv != NULL) BN_zero(dv);
-		return(1);
-		}
-
-	BN_CTX_start(ctx);
-	D = BN_CTX_get(ctx);
-	if (dv == NULL) dv = BN_CTX_get(ctx);
-	if (rem == NULL) rem = BN_CTX_get(ctx);
-	if (D == NULL || dv == NULL || rem == NULL)
-		goto end;
-
-	nd=BN_num_bits(d);
-	nm=BN_num_bits(m);
-	if (BN_copy(D,d) == NULL) goto end;
-	if (BN_copy(rem,m) == NULL) goto end;
-
-	/* The next 2 are needed so we can do a dv->d[0]|=1 later
-	 * since BN_lshift1 will only work once there is a value :-) */
-	BN_zero(dv);
-	if(bn_wexpand(dv,1) == NULL) goto end;
-	dv->top=1;
-
-	if (!BN_lshift(D,D,nm-nd)) goto end;
-	for (i=nm-nd; i>=0; i--)
-		{
-		if (!BN_lshift1(dv,dv)) goto end;
-		if (BN_ucmp(rem,D) >= 0)
-			{
-			dv->d[0]|=1;
-			if (!BN_usub(rem,rem,D)) goto end;
-			}
-/* CAN IMPROVE (and have now :=) */
-		if (!BN_rshift1(D,D)) goto end;
-		}
-	rem->neg=BN_is_zero(rem)?0:m->neg;
-	dv->neg=m->neg^d->neg;
-	ret = 1;
- end:
-	BN_CTX_end(ctx);
-	return(ret);
-	}
-
-#else
-
-#if !defined(OPENSSL_NO_ASM) && !defined(OPENSSL_NO_INLINE_ASM) \
-    && !defined(PEDANTIC) && !defined(BN_DIV3W)
-# if defined(__GNUC__) && __GNUC__>=2
-#  if defined(__i386) || defined (__i386__)
-   /*
-    * There were two reasons for implementing this template:
-    * - GNU C generates a call to a function (__udivdi3 to be exact)
-    *   in reply to ((((BN_ULLONG)n0)<<BN_BITS2)|n1)/d0 (I fail to
-    *   understand why...);
-    * - divl doesn't only calculate quotient, but also leaves
-    *   remainder in %edx which we can definitely use here:-)
-    *
-    *					<appro@fy.chalmers.se>
-    */
-#undef bn_div_words
-#  define bn_div_words(n0,n1,d0)		\
-	({  asm volatile (			\
-		"divl	%4"			\
-		: "=a"(q), "=d"(rem)		\
-		: "a"(n1), "d"(n0), "g"(d0)	\
-		: "cc");			\
-	    q;					\
-	})
-#  define REMAINDER_IS_ALREADY_CALCULATED
-#  elif defined(__x86_64) && defined(SIXTY_FOUR_BIT_LONG)
-   /*
-    * Same story here, but it's 128-bit by 64-bit division. Wow!
-    *					<appro@fy.chalmers.se>
-    */
-#  undef bn_div_words
-#  define bn_div_words(n0,n1,d0)		\
-	({  asm volatile (			\
-		"divq	%4"			\
-		: "=a"(q), "=d"(rem)		\
-		: "a"(n1), "d"(n0), "g"(d0)	\
-		: "cc");			\
-	    q;					\
-	})
-#  define REMAINDER_IS_ALREADY_CALCULATED
-#  endif /* __<cpu> */
-# endif /* __GNUC__ */
-#endif /* OPENSSL_NO_ASM */
-
-
-/* BN_div computes  dv := num / divisor,  rounding towards
- * zero, and sets up rm  such that  dv*divisor + rm = num  holds.
- * Thus:
- *     dv->neg == num->neg ^ divisor->neg  (unless the result is zero)
- *     rm->neg == num->neg                 (unless the remainder is zero)
- * If 'dv' or 'rm' is NULL, the respective value is not returned.
- */
-int BN_div(BIGNUM *dv, BIGNUM *rm, const BIGNUM *num, const BIGNUM *divisor,
-	   BN_CTX *ctx)
-	{
-	int norm_shift,i,loop;
-	BIGNUM *tmp,wnum,*snum,*sdiv,*res;
-	BN_ULONG *resp,*wnump;
-	BN_ULONG d0,d1;
-	int num_n,div_n;
-	int no_branch=0;
-
-	/* Invalid zero-padding would have particularly bad consequences
-	 * in the case of 'num', so don't just rely on bn_check_top() for this one
-	 * (bn_check_top() works only for BN_DEBUG builds) */
-	if (num->top > 0 && num->d[num->top - 1] == 0)
-		{
-		BNerr(BN_F_BN_DIV,BN_R_NOT_INITIALIZED);
-		return 0;
-		}
-
-	bn_check_top(num);
-
-	if ((BN_get_flags(num, BN_FLG_CONSTTIME) != 0) || (BN_get_flags(divisor, BN_FLG_CONSTTIME) != 0))
-		{
-		no_branch=1;
-		}
-
-	bn_check_top(dv);
-	bn_check_top(rm);
-	/* bn_check_top(num); */ /* 'num' has been checked already */
-	bn_check_top(divisor);
-
-	if (BN_is_zero(divisor))
-		{
-		BNerr(BN_F_BN_DIV,BN_R_DIV_BY_ZERO);
-		return(0);
-		}
-
-	if (!no_branch && BN_ucmp(num,divisor) < 0)
-		{
-		if (rm != NULL)
-			{ if (BN_copy(rm,num) == NULL) return(0); }
-		if (dv != NULL) BN_zero(dv);
-		return(1);
-		}
-
-	BN_CTX_start(ctx);
-	tmp=BN_CTX_get(ctx);
-	snum=BN_CTX_get(ctx);
-	sdiv=BN_CTX_get(ctx);
-	if (dv == NULL)
-		res=BN_CTX_get(ctx);
-	else	res=dv;
-	if (sdiv == NULL || res == NULL || tmp == NULL || snum == NULL)
-		goto err;
-
-	/* First we normalise the numbers */
-	norm_shift=BN_BITS2-((BN_num_bits(divisor))%BN_BITS2);
-	if (!(BN_lshift(sdiv,divisor,norm_shift))) goto err;
-	sdiv->neg=0;
-	norm_shift+=BN_BITS2;
-	if (!(BN_lshift(snum,num,norm_shift))) goto err;
-	snum->neg=0;
-
-	if (no_branch)
-		{
-		/* Since we don't know whether snum is larger than sdiv,
-		 * we pad snum with enough zeroes without changing its
-		 * value. 
-		 */
-		if (snum->top <= sdiv->top+1) 
-			{
-			if (bn_wexpand(snum, sdiv->top + 2) == NULL) goto err;
-			for (i = snum->top; i < sdiv->top + 2; i++) snum->d[i] = 0;
-			snum->top = sdiv->top + 2;
-			}
-		else
-			{
-			if (bn_wexpand(snum, snum->top + 1) == NULL) goto err;
-			snum->d[snum->top] = 0;
-			snum->top ++;
-			}
-		}
-
-	div_n=sdiv->top;
-	num_n=snum->top;
-	loop=num_n-div_n;
-	/* Lets setup a 'window' into snum
-	 * This is the part that corresponds to the current
-	 * 'area' being divided */
-	wnum.neg   = 0;
-	wnum.d     = &(snum->d[loop]);
-	wnum.top   = div_n;
-	/* only needed when BN_ucmp messes up the values between top and max */
-	wnum.dmax  = snum->dmax - loop; /* so we don't step out of bounds */
-
-	/* Get the top 2 words of sdiv */
-	/* div_n=sdiv->top; */
-	d0=sdiv->d[div_n-1];
-	d1=(div_n == 1)?0:sdiv->d[div_n-2];
-
-	/* pointer to the 'top' of snum */
-	wnump= &(snum->d[num_n-1]);
-
-	/* Setup to 'res' */
-	res->neg= (num->neg^divisor->neg);
-	if (!bn_wexpand(res,(loop+1))) goto err;
-	res->top=loop-no_branch;
-	resp= &(res->d[loop-1]);
-
-	/* space for temp */
-	if (!bn_wexpand(tmp,(div_n+1))) goto err;
-
-	if (!no_branch)
-		{
-		if (BN_ucmp(&wnum,sdiv) >= 0)
-			{
-			/* If BN_DEBUG_RAND is defined BN_ucmp changes (via
-			 * bn_pollute) the const bignum arguments =>
-			 * clean the values between top and max again */
-			bn_clear_top2max(&wnum);
-			bn_sub_words(wnum.d, wnum.d, sdiv->d, div_n);
-			*resp=1;
-			}
-		else
-			res->top--;
-		}
-
-	/* if res->top == 0 then clear the neg value otherwise decrease
-	 * the resp pointer */
-	if (res->top == 0)
-		res->neg = 0;
-	else
-		resp--;
-
-	for (i=0; i<loop-1; i++, wnump--, resp--)
-		{
-		BN_ULONG q,l0;
-		/* the first part of the loop uses the top two words of
-		 * snum and sdiv to calculate a BN_ULONG q such that
-		 * | wnum - sdiv * q | < sdiv */
-#if defined(BN_DIV3W) && !defined(OPENSSL_NO_ASM)
-		BN_ULONG bn_div_3_words(BN_ULONG*,BN_ULONG,BN_ULONG);
-		q=bn_div_3_words(wnump,d1,d0);
-#else
-		BN_ULONG n0,n1,rem=0;
-
-		n0=wnump[0];
-		n1=wnump[-1];
-		if (n0 == d0)
-			q=BN_MASK2;
-		else 			/* n0 < d0 */
-			{
-#ifdef BN_LLONG
-			BN_ULLONG t2;
-
-#if defined(BN_LLONG) && defined(BN_DIV2W) && !defined(bn_div_words)
-			q=(BN_ULONG)(((((BN_ULLONG)n0)<<BN_BITS2)|n1)/d0);
-#else
-			q=bn_div_words(n0,n1,d0);
-#ifdef BN_DEBUG_LEVITTE
-			fprintf(stderr,"DEBUG: bn_div_words(0x%08X,0x%08X,0x%08\
-X) -> 0x%08X\n",
-				n0, n1, d0, q);
-#endif
-#endif
-
-#ifndef REMAINDER_IS_ALREADY_CALCULATED
-			/*
-			 * rem doesn't have to be BN_ULLONG. The least we
-			 * know it's less that d0, isn't it?
-			 */
-			rem=(n1-q*d0)&BN_MASK2;
-#endif
-			t2=(BN_ULLONG)d1*q;
-
-			for (;;)
-				{
-				if (t2 <= ((((BN_ULLONG)rem)<<BN_BITS2)|wnump[-2]))
-					break;
-				q--;
-				rem += d0;
-				if (rem < d0) break; /* don't let rem overflow */
-				t2 -= d1;
-				}
-#else /* !BN_LLONG */
-			BN_ULONG t2l,t2h;
-
-			q=bn_div_words(n0,n1,d0);
-#ifdef BN_DEBUG_LEVITTE
-			fprintf(stderr,"DEBUG: bn_div_words(0x%08X,0x%08X,0x%08\
-X) -> 0x%08X\n",
-				n0, n1, d0, q);
-#endif
-#ifndef REMAINDER_IS_ALREADY_CALCULATED
-			rem=(n1-q*d0)&BN_MASK2;
-#endif
-
-#if defined(BN_UMULT_LOHI)
-			BN_UMULT_LOHI(t2l,t2h,d1,q);
-#elif defined(BN_UMULT_HIGH)
-			t2l = d1 * q;
-			t2h = BN_UMULT_HIGH(d1,q);
-#else
-			{
-			BN_ULONG ql, qh;
-			t2l=LBITS(d1); t2h=HBITS(d1);
-			ql =LBITS(q);  qh =HBITS(q);
-			mul64(t2l,t2h,ql,qh); /* t2=(BN_ULLONG)d1*q; */
-			}
-#endif
-
-			for (;;)
-				{
-				if ((t2h < rem) ||
-					((t2h == rem) && (t2l <= wnump[-2])))
-					break;
-				q--;
-				rem += d0;
-				if (rem < d0) break; /* don't let rem overflow */
-				if (t2l < d1) t2h--; t2l -= d1;
-				}
-#endif /* !BN_LLONG */
-			}
-#endif /* !BN_DIV3W */
-
-		l0=bn_mul_words(tmp->d,sdiv->d,div_n,q);
-		tmp->d[div_n]=l0;
-		wnum.d--;
-		/* ingore top values of the bignums just sub the two 
-		 * BN_ULONG arrays with bn_sub_words */
-		if (bn_sub_words(wnum.d, wnum.d, tmp->d, div_n+1))
-			{
-			/* Note: As we have considered only the leading
-			 * two BN_ULONGs in the calculation of q, sdiv * q
-			 * might be greater than wnum (but then (q-1) * sdiv
-			 * is less or equal than wnum)
-			 */
-			q--;
-			if (bn_add_words(wnum.d, wnum.d, sdiv->d, div_n))
-				/* we can't have an overflow here (assuming
-				 * that q != 0, but if q == 0 then tmp is
-				 * zero anyway) */
-				(*wnump)++;
-			}
-		/* store part of the result */
-		*resp = q;
-		}
-	bn_correct_top(snum);
-	if (rm != NULL)
-		{
-		/* Keep a copy of the neg flag in num because if rm==num
-		 * BN_rshift() will overwrite it.
-		 */
-		int neg = num->neg;
-		BN_rshift(rm,snum,norm_shift);
-		if (!BN_is_zero(rm))
-			rm->neg = neg;
-		bn_check_top(rm);
-		}
-	if (no_branch)	bn_correct_top(res);
-	BN_CTX_end(ctx);
-	return(1);
-err:
-	bn_check_top(rm);
-	BN_CTX_end(ctx);
-	return(0);
-	}
-#endif