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143 lines
4.1 KiB
C
143 lines
4.1 KiB
C
/* crypto/bn/bn_ctx.c */
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/* Written by Ulf Moeller for the OpenSSL project. */
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/* ====================================================================
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* Copyright (c) 1998-2000 The OpenSSL Project. All rights reserved.
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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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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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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
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* openssl-core@openssl.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com).
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*
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*/
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#ifndef BN_CTX_DEBUG
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# undef NDEBUG /* avoid conflicting definitions */
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# define NDEBUG
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <assert.h>
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#include <bn.h>
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BN_CTX *BN_CTX_new(void)
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{
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BN_CTX *ret;
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ret=(BN_CTX *)malloc(sizeof(BN_CTX));
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if (ret == NULL)
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{
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return(NULL);
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}
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BN_CTX_init(ret);
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ret->flags=BN_FLG_MALLOCED;
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return(ret);
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}
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void BN_CTX_init(BN_CTX *ctx)
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{
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int i;
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ctx->tos = 0;
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ctx->flags = 0;
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ctx->depth = 0;
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ctx->too_many = 0;
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for (i = 0; i < BN_CTX_NUM; i++)
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BN_init(&(ctx->bn[i]));
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}
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void BN_CTX_free(BN_CTX *ctx)
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{
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int i;
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if (ctx == NULL) return;
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assert(ctx->depth == 0);
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for (i=0; i < BN_CTX_NUM; i++)
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BN_clear_free(&(ctx->bn[i]));
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if (ctx->flags & BN_FLG_MALLOCED)
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free(ctx);
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}
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void BN_CTX_start(BN_CTX *ctx)
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{
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if (ctx->depth < BN_CTX_NUM_POS)
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ctx->pos[ctx->depth] = ctx->tos;
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ctx->depth++;
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}
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BIGNUM *BN_CTX_get(BN_CTX *ctx)
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{
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if (ctx->depth > BN_CTX_NUM_POS || ctx->tos >= BN_CTX_NUM)
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{
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if (!ctx->too_many)
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{
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/* disable error code until BN_CTX_end is called: */
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ctx->too_many = 1;
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}
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return NULL;
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}
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return (&(ctx->bn[ctx->tos++]));
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}
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void BN_CTX_end(BN_CTX *ctx)
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{
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if (ctx == NULL) return;
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assert(ctx->depth > 0);
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if (ctx->depth == 0)
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/* should never happen, but we can tolerate it if not in
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* debug mode (could be a 'goto err' in the calling function
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* before BN_CTX_start was reached) */
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BN_CTX_start(ctx);
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ctx->too_many = 0;
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ctx->depth--;
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if (ctx->depth < BN_CTX_NUM_POS)
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ctx->tos = ctx->pos[ctx->depth];
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}
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