Delete bundled copy of OpenSSL and replace with README.

openssl/crypto/bn/bn_mod.c

Index: openssl/crypto/bn/bn_mod.c
diff --git a/openssl/crypto/bn/bn_mod.c b/openssl/crypto/bn/bn_mod.c
deleted file mode 100644
index 77d6ddb91a5fc9fe1b89ec1caa9579d1c95baa10..0000000000000000000000000000000000000000
--- a/openssl/crypto/bn/bn_mod.c
+++ /dev/null
@@ -1,301 +0,0 @@
-/* crypto/bn/bn_mod.c */
-/* Includes code written by Lenka Fibikova <fibikova@exp-math.uni-essen.de>
- * for the OpenSSL project. */
-/* ====================================================================
- * 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).
- *
- */
-/* 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 "cryptlib.h"
-#include "bn_lcl.h"
-
-
-#if 0 /* now just a #define */
-int BN_mod(BIGNUM *rem, const BIGNUM *m, const BIGNUM *d, BN_CTX *ctx)
-	{
-	return(BN_div(NULL,rem,m,d,ctx));
-	/* note that  rem->neg == m->neg  (unless the remainder is zero) */
-	}
-#endif
-
-
-int BN_nnmod(BIGNUM *r, const BIGNUM *m, const BIGNUM *d, BN_CTX *ctx)
-	{
-	/* like BN_mod, but returns non-negative remainder
-	 * (i.e.,  0 <= r < |d|  always holds) */
-
-	if (!(BN_mod(r,m,d,ctx)))
-		return 0;
-	if (!r->neg)
-		return 1;
-	/* now   -|d| < r < 0,  so we have to set  r := r + |d| */
-	return (d->neg ? BN_sub : BN_add)(r, r, d);
-}
-
-
-int BN_mod_add(BIGNUM *r, const BIGNUM *a, const BIGNUM *b, const BIGNUM *m, BN_CTX *ctx)
-	{
-	if (!BN_add(r, a, b)) return 0;
-	return BN_nnmod(r, r, m, ctx);
-	}
-
-
-/* BN_mod_add variant that may be used if both  a  and  b  are non-negative
- * and less than  m */
-int BN_mod_add_quick(BIGNUM *r, const BIGNUM *a, const BIGNUM *b, const BIGNUM *m)
-	{
-	if (!BN_uadd(r, a, b)) return 0;
-	if (BN_ucmp(r, m) >= 0)
-		return BN_usub(r, r, m);
-	return 1;
-	}
-
-
-int BN_mod_sub(BIGNUM *r, const BIGNUM *a, const BIGNUM *b, const BIGNUM *m, BN_CTX *ctx)
-	{
-	if (!BN_sub(r, a, b)) return 0;
-	return BN_nnmod(r, r, m, ctx);
-	}
-
-
-/* BN_mod_sub variant that may be used if both  a  and  b  are non-negative
- * and less than  m */
-int BN_mod_sub_quick(BIGNUM *r, const BIGNUM *a, const BIGNUM *b, const BIGNUM *m)
-	{
-	if (!BN_sub(r, a, b)) return 0;
-	if (r->neg)
-		return BN_add(r, r, m);
-	return 1;
-	}
-
-
-/* slow but works */
-int BN_mod_mul(BIGNUM *r, const BIGNUM *a, const BIGNUM *b, const BIGNUM *m,
-	BN_CTX *ctx)
-	{
-	BIGNUM *t;
-	int ret=0;
-
-	bn_check_top(a);
-	bn_check_top(b);
-	bn_check_top(m);
-
-	BN_CTX_start(ctx);
-	if ((t = BN_CTX_get(ctx)) == NULL) goto err;
-	if (a == b)
-		{ if (!BN_sqr(t,a,ctx)) goto err; }
-	else
-		{ if (!BN_mul(t,a,b,ctx)) goto err; }
-	if (!BN_nnmod(r,t,m,ctx)) goto err;
-	bn_check_top(r);
-	ret=1;
-err:
-	BN_CTX_end(ctx);
-	return(ret);
-	}
-
-
-int BN_mod_sqr(BIGNUM *r, const BIGNUM *a, const BIGNUM *m, BN_CTX *ctx)
-	{
-	if (!BN_sqr(r, a, ctx)) return 0;
-	/* r->neg == 0,  thus we don't need BN_nnmod */
-	return BN_mod(r, r, m, ctx);
-	}
-
-
-int BN_mod_lshift1(BIGNUM *r, const BIGNUM *a, const BIGNUM *m, BN_CTX *ctx)
-	{
-	if (!BN_lshift1(r, a)) return 0;
-	bn_check_top(r);
-	return BN_nnmod(r, r, m, ctx);
-	}
-
-
-/* BN_mod_lshift1 variant that may be used if  a  is non-negative
- * and less than  m */
-int BN_mod_lshift1_quick(BIGNUM *r, const BIGNUM *a, const BIGNUM *m)
-	{
-	if (!BN_lshift1(r, a)) return 0;
-	bn_check_top(r);
-	if (BN_cmp(r, m) >= 0)
-		return BN_sub(r, r, m);
-	return 1;
-	}
-
-
-int BN_mod_lshift(BIGNUM *r, const BIGNUM *a, int n, const BIGNUM *m, BN_CTX *ctx)
-	{
-	BIGNUM *abs_m = NULL;
-	int ret;
-
-	if (!BN_nnmod(r, a, m, ctx)) return 0;
-
-	if (m->neg)
-		{
-		abs_m = BN_dup(m);
-		if (abs_m == NULL) return 0;
-		abs_m->neg = 0;
-		}
-	
-	ret = BN_mod_lshift_quick(r, r, n, (abs_m ? abs_m : m));
-	bn_check_top(r);
-
-	if (abs_m)
-		BN_free(abs_m);
-	return ret;
-	}
-
-
-/* BN_mod_lshift variant that may be used if  a  is non-negative
- * and less than  m */
-int BN_mod_lshift_quick(BIGNUM *r, const BIGNUM *a, int n, const BIGNUM *m)
-	{
-	if (r != a)
-		{
-		if (BN_copy(r, a) == NULL) return 0;
-		}
-
-	while (n > 0)
-		{
-		int max_shift;
-		
-		/* 0 < r < m */
-		max_shift = BN_num_bits(m) - BN_num_bits(r);
-		/* max_shift >= 0 */
-
-		if (max_shift < 0)
-			{
-			BNerr(BN_F_BN_MOD_LSHIFT_QUICK, BN_R_INPUT_NOT_REDUCED);
-			return 0;
-			}
-
-		if (max_shift > n)
-			max_shift = n;
-
-		if (max_shift)
-			{
-			if (!BN_lshift(r, r, max_shift)) return 0;
-			n -= max_shift;
-			}
-		else
-			{
-			if (!BN_lshift1(r, r)) return 0;
-			--n;
-			}
-
-		/* BN_num_bits(r) <= BN_num_bits(m) */
-
-		if (BN_cmp(r, m) >= 0) 
-			{
-			if (!BN_sub(r, r, m)) return 0;
-			}
-		}
-	bn_check_top(r);
-	
-	return 1;
-	}