Delete bundled copy of OpenSSL and replace with README.

openssl/crypto/bn/bn_ctx.c

Index: openssl/crypto/bn/bn_ctx.c
diff --git a/openssl/crypto/bn/bn_ctx.c b/openssl/crypto/bn/bn_ctx.c
deleted file mode 100644
index 3f2256f67575aeca46c110ba8416bfba1daa60af..0000000000000000000000000000000000000000
--- a/openssl/crypto/bn/bn_ctx.c
+++ /dev/null
@@ -1,454 +0,0 @@
-/* crypto/bn/bn_ctx.c */
-/* Written by Ulf Moeller for the OpenSSL project. */
-/* ====================================================================
- * Copyright (c) 1998-2004 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).
- *
- */
-
-#if !defined(BN_CTX_DEBUG) && !defined(BN_DEBUG)
-#ifndef NDEBUG
-#define NDEBUG
-#endif
-#endif
-
-#include <stdio.h>
-#include <assert.h>
-
-#include "cryptlib.h"
-#include "bn_lcl.h"
-
-/* TODO list
- *
- * 1. Check a bunch of "(words+1)" type hacks in various bignum functions and
- * check they can be safely removed.
- *  - Check +1 and other ugliness in BN_from_montgomery()
- *
- * 2. Consider allowing a BN_new_ex() that, at least, lets you specify an
- * appropriate 'block' size that will be honoured by bn_expand_internal() to
- * prevent piddly little reallocations. OTOH, profiling bignum expansions in
- * BN_CTX doesn't show this to be a big issue.
- */
-
-/* How many bignums are in each "pool item"; */
-#define BN_CTX_POOL_SIZE	16
-/* The stack frame info is resizing, set a first-time expansion size; */
-#define BN_CTX_START_FRAMES	32
-
-/***********/
-/* BN_POOL */
-/***********/
-
-/* A bundle of bignums that can be linked with other bundles */
-typedef struct bignum_pool_item
-	{
-	/* The bignum values */
-	BIGNUM vals[BN_CTX_POOL_SIZE];
-	/* Linked-list admin */
-	struct bignum_pool_item *prev, *next;
-	} BN_POOL_ITEM;
-/* A linked-list of bignums grouped in bundles */
-typedef struct bignum_pool
-	{
-	/* Linked-list admin */
-	BN_POOL_ITEM *head, *current, *tail;
-	/* Stack depth and allocation size */
-	unsigned used, size;
-	} BN_POOL;
-static void		BN_POOL_init(BN_POOL *);
-static void		BN_POOL_finish(BN_POOL *);
-#ifndef OPENSSL_NO_DEPRECATED
-static void		BN_POOL_reset(BN_POOL *);
-#endif
-static BIGNUM *		BN_POOL_get(BN_POOL *);
-static void		BN_POOL_release(BN_POOL *, unsigned int);
-
-/************/
-/* BN_STACK */
-/************/
-
-/* A wrapper to manage the "stack frames" */
-typedef struct bignum_ctx_stack
-	{
-	/* Array of indexes into the bignum stack */
-	unsigned int *indexes;
-	/* Number of stack frames, and the size of the allocated array */
-	unsigned int depth, size;
-	} BN_STACK;
-static void		BN_STACK_init(BN_STACK *);
-static void		BN_STACK_finish(BN_STACK *);
-#ifndef OPENSSL_NO_DEPRECATED
-static void		BN_STACK_reset(BN_STACK *);
-#endif
-static int		BN_STACK_push(BN_STACK *, unsigned int);
-static unsigned int	BN_STACK_pop(BN_STACK *);
-
-/**********/
-/* BN_CTX */
-/**********/
-
-/* The opaque BN_CTX type */
-struct bignum_ctx
-	{
-	/* The bignum bundles */
-	BN_POOL pool;
-	/* The "stack frames", if you will */
-	BN_STACK stack;
-	/* The number of bignums currently assigned */
-	unsigned int used;
-	/* Depth of stack overflow */
-	int err_stack;
-	/* Block "gets" until an "end" (compatibility behaviour) */
-	int too_many;
-	};
-
-/* Enable this to find BN_CTX bugs */
-#ifdef BN_CTX_DEBUG
-static const char *ctxdbg_cur = NULL;
-static void ctxdbg(BN_CTX *ctx)
-	{
-	unsigned int bnidx = 0, fpidx = 0;
-	BN_POOL_ITEM *item = ctx->pool.head;
-	BN_STACK *stack = &ctx->stack;
-	fprintf(stderr,"(%08x): ", (unsigned int)ctx);
-	while(bnidx < ctx->used)
-		{
-		fprintf(stderr,"%03x ", item->vals[bnidx++ % BN_CTX_POOL_SIZE].dmax);
-		if(!(bnidx % BN_CTX_POOL_SIZE))
-			item = item->next;
-		}
-	fprintf(stderr,"\n");
-	bnidx = 0;
-	fprintf(stderr,"          : ");
-	while(fpidx < stack->depth)
-		{
-		while(bnidx++ < stack->indexes[fpidx])
-			fprintf(stderr,"    ");
-		fprintf(stderr,"^^^ ");
-		bnidx++;
-		fpidx++;
-		}
-	fprintf(stderr,"\n");
-	}
-#define CTXDBG_ENTRY(str, ctx)	do { \
-				ctxdbg_cur = (str); \
-				fprintf(stderr,"Starting %s\n", ctxdbg_cur); \
-				ctxdbg(ctx); \
-				} while(0)
-#define CTXDBG_EXIT(ctx)	do { \
-				fprintf(stderr,"Ending %s\n", ctxdbg_cur); \
-				ctxdbg(ctx); \
-				} while(0)
-#define CTXDBG_RET(ctx,ret)
-#else
-#define CTXDBG_ENTRY(str, ctx)
-#define CTXDBG_EXIT(ctx)
-#define CTXDBG_RET(ctx,ret)
-#endif
-
-/* This function is an evil legacy and should not be used. This implementation
- * is WYSIWYG, though I've done my best. */
-#ifndef OPENSSL_NO_DEPRECATED
-void BN_CTX_init(BN_CTX *ctx)
-	{
-	/* Assume the caller obtained the context via BN_CTX_new() and so is
-	 * trying to reset it for use. Nothing else makes sense, least of all
-	 * binary compatibility from a time when they could declare a static
-	 * variable. */
-	BN_POOL_reset(&ctx->pool);
-	BN_STACK_reset(&ctx->stack);
-	ctx->used = 0;
-	ctx->err_stack = 0;
-	ctx->too_many = 0;
-	}
-#endif
-
-BN_CTX *BN_CTX_new(void)
-	{
-	BN_CTX *ret = OPENSSL_malloc(sizeof(BN_CTX));
-	if(!ret)
-		{
-		BNerr(BN_F_BN_CTX_NEW,ERR_R_MALLOC_FAILURE);
-		return NULL;
-		}
-	/* Initialise the structure */
-	BN_POOL_init(&ret->pool);
-	BN_STACK_init(&ret->stack);
-	ret->used = 0;
-	ret->err_stack = 0;
-	ret->too_many = 0;
-	return ret;
-	}
-
-void BN_CTX_free(BN_CTX *ctx)
-	{
-	if (ctx == NULL)
-		return;
-#ifdef BN_CTX_DEBUG
-	{
-	BN_POOL_ITEM *pool = ctx->pool.head;
-	fprintf(stderr,"BN_CTX_free, stack-size=%d, pool-bignums=%d\n",
-		ctx->stack.size, ctx->pool.size);
-	fprintf(stderr,"dmaxs: ");
-	while(pool) {
-		unsigned loop = 0;
-		while(loop < BN_CTX_POOL_SIZE)
-			fprintf(stderr,"%02x ", pool->vals[loop++].dmax);
-		pool = pool->next;
-	}
-	fprintf(stderr,"\n");
-	}
-#endif
-	BN_STACK_finish(&ctx->stack);
-	BN_POOL_finish(&ctx->pool);
-	OPENSSL_free(ctx);
-	}
-
-void BN_CTX_start(BN_CTX *ctx)
-	{
-	CTXDBG_ENTRY("BN_CTX_start", ctx);
-	/* If we're already overflowing ... */
-	if(ctx->err_stack || ctx->too_many)
-		ctx->err_stack++;
-	/* (Try to) get a new frame pointer */
-	else if(!BN_STACK_push(&ctx->stack, ctx->used))
-		{
-		BNerr(BN_F_BN_CTX_START,BN_R_TOO_MANY_TEMPORARY_VARIABLES);
-		ctx->err_stack++;
-		}
-	CTXDBG_EXIT(ctx);
-	}
-
-void BN_CTX_end(BN_CTX *ctx)
-	{
-	CTXDBG_ENTRY("BN_CTX_end", ctx);
-	if(ctx->err_stack)
-		ctx->err_stack--;
-	else
-		{
-		unsigned int fp = BN_STACK_pop(&ctx->stack);
-		/* Does this stack frame have anything to release? */
-		if(fp < ctx->used)
-			BN_POOL_release(&ctx->pool, ctx->used - fp);
-		ctx->used = fp;
-		/* Unjam "too_many" in case "get" had failed */
-		ctx->too_many = 0;
-		}
-	CTXDBG_EXIT(ctx);
-	}
-
-BIGNUM *BN_CTX_get(BN_CTX *ctx)
-	{
-	BIGNUM *ret;
-	CTXDBG_ENTRY("BN_CTX_get", ctx);
-	if(ctx->err_stack || ctx->too_many) return NULL;
-	if((ret = BN_POOL_get(&ctx->pool)) == NULL)
-		{
-		/* Setting too_many prevents repeated "get" attempts from
-		 * cluttering the error stack. */
-		ctx->too_many = 1;
-		BNerr(BN_F_BN_CTX_GET,BN_R_TOO_MANY_TEMPORARY_VARIABLES);
-		return NULL;
-		}
-	/* OK, make sure the returned bignum is "zero" */
-	BN_zero(ret);
-	ctx->used++;
-	CTXDBG_RET(ctx, ret);
-	return ret;
-	}
-
-/************/
-/* BN_STACK */
-/************/
-
-static void BN_STACK_init(BN_STACK *st)
-	{
-	st->indexes = NULL;
-	st->depth = st->size = 0;
-	}
-
-static void BN_STACK_finish(BN_STACK *st)
-	{
-	if(st->size) OPENSSL_free(st->indexes);
-	}
-
-#ifndef OPENSSL_NO_DEPRECATED
-static void BN_STACK_reset(BN_STACK *st)
-	{
-	st->depth = 0;
-	}
-#endif
-
-static int BN_STACK_push(BN_STACK *st, unsigned int idx)
-	{
-	if(st->depth == st->size)
-		/* Need to expand */
-		{
-		unsigned int newsize = (st->size ?
-				(st->size * 3 / 2) : BN_CTX_START_FRAMES);
-		unsigned int *newitems = OPENSSL_malloc(newsize *
-						sizeof(unsigned int));
-		if(!newitems) return 0;
-		if(st->depth)
-			memcpy(newitems, st->indexes, st->depth *
-						sizeof(unsigned int));
-		if(st->size) OPENSSL_free(st->indexes);
-		st->indexes = newitems;
-		st->size = newsize;
-		}
-	st->indexes[(st->depth)++] = idx;
-	return 1;
-	}
-
-static unsigned int BN_STACK_pop(BN_STACK *st)
-	{
-	return st->indexes[--(st->depth)];
-	}
-
-/***********/
-/* BN_POOL */
-/***********/
-
-static void BN_POOL_init(BN_POOL *p)
-	{
-	p->head = p->current = p->tail = NULL;
-	p->used = p->size = 0;
-	}
-
-static void BN_POOL_finish(BN_POOL *p)
-	{
-	while(p->head)
-		{
-		unsigned int loop = 0;
-		BIGNUM *bn = p->head->vals;
-		while(loop++ < BN_CTX_POOL_SIZE)
-			{
-			if(bn->d) BN_clear_free(bn);
-			bn++;
-			}
-		p->current = p->head->next;
-		OPENSSL_free(p->head);
-		p->head = p->current;
-		}
-	}
-
-#ifndef OPENSSL_NO_DEPRECATED
-static void BN_POOL_reset(BN_POOL *p)
-	{
-	BN_POOL_ITEM *item = p->head;
-	while(item)
-		{
-		unsigned int loop = 0;
-		BIGNUM *bn = item->vals;
-		while(loop++ < BN_CTX_POOL_SIZE)
-			{
-			if(bn->d) BN_clear(bn);
-			bn++;
-			}
-		item = item->next;
-		}
-	p->current = p->head;
-	p->used = 0;
-	}
-#endif
-
-static BIGNUM *BN_POOL_get(BN_POOL *p)
-	{
-	if(p->used == p->size)
-		{
-		BIGNUM *bn;
-		unsigned int loop = 0;
-		BN_POOL_ITEM *item = OPENSSL_malloc(sizeof(BN_POOL_ITEM));
-		if(!item) return NULL;
-		/* Initialise the structure */
-		bn = item->vals;
-		while(loop++ < BN_CTX_POOL_SIZE)
-			BN_init(bn++);
-		item->prev = p->tail;
-		item->next = NULL;
-		/* Link it in */
-		if(!p->head)
-			p->head = p->current = p->tail = item;
-		else
-			{
-			p->tail->next = item;
-			p->tail = item;
-			p->current = item;
-			}
-		p->size += BN_CTX_POOL_SIZE;
-		p->used++;
-		/* Return the first bignum from the new pool */
-		return item->vals;
-		}
-	if(!p->used)
-		p->current = p->head;
-	else if((p->used % BN_CTX_POOL_SIZE) == 0)
-		p->current = p->current->next;
-	return p->current->vals + ((p->used++) % BN_CTX_POOL_SIZE);
-	}
-
-static void BN_POOL_release(BN_POOL *p, unsigned int num)
-	{
-	unsigned int offset = (p->used - 1) % BN_CTX_POOL_SIZE;
-	p->used -= num;
-	while(num--)
-		{
-		bn_check_top(p->current->vals + offset);
-		if(!offset)
-			{
-			offset = BN_CTX_POOL_SIZE - 1;
-			p->current = p->current->prev;
-			}
-		else
-			offset--;
-		}
-	}
-