1 files changed, 155 insertions, 0 deletions

diff --git a/src/lib/libcrypto/bn/bn_ctx.c b/src/lib/libcrypto/bn/bn_ctx.c
new file mode 100644
index 0000000000..7daf19eb84
--- /dev/null
+++ b/src/lib/libcrypto/bn/bn_ctx.c
@@ -0,0 +1,155 @@
+/* crypto/bn/bn_ctx.c */
+/* Written by Ulf Moeller 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).
+ *
+ */
+
+#ifndef BN_CTX_DEBUG
+# undef NDEBUG /* avoid conflicting definitions */
+# define NDEBUG
+#endif
+
+#include <stdio.h>
+#include <assert.h>
+
+#include "cryptlib.h"
+#include "bn_lcl.h"
+
+
+BN_CTX *BN_CTX_new(void)
+        {
+        BN_CTX *ret;
+
+        ret=(BN_CTX *)OPENSSL_malloc(sizeof(BN_CTX));
+        if (ret == NULL)
+                {
+                BNerr(BN_F_BN_CTX_NEW,ERR_R_MALLOC_FAILURE);
+                return(NULL);
+                }
+
+        BN_CTX_init(ret);
+        ret->flags=BN_FLG_MALLOCED;
+        return(ret);
+        }
+
+void BN_CTX_init(BN_CTX *ctx)
+        {
+#if 0 /* explicit version */
+        int i;
+        ctx->tos = 0;
+        ctx->flags = 0;
+        ctx->depth = 0;
+        ctx->too_many = 0;
+        for (i = 0; i < BN_CTX_NUM; i++)
+                BN_init(&(ctx->bn[i]));
+#else
+        memset(ctx, 0, sizeof *ctx);
+#endif
+        }
+
+void BN_CTX_free(BN_CTX *ctx)
+        {
+        int i;
+
+        if (ctx == NULL) return;
+        assert(ctx->depth == 0);
+
+        for (i=0; i < BN_CTX_NUM; i++)
+                BN_clear_free(&(ctx->bn[i]));
+        if (ctx->flags & BN_FLG_MALLOCED)
+                OPENSSL_free(ctx);
+        }
+
+void BN_CTX_start(BN_CTX *ctx)
+        {
+        if (ctx->depth < BN_CTX_NUM_POS)
+                ctx->pos[ctx->depth] = ctx->tos;
+        ctx->depth++;
+        }
+
+
+BIGNUM *BN_CTX_get(BN_CTX *ctx)
+        {
+        /* Note: If BN_CTX_get is ever changed to allocate BIGNUMs dynamically,
+         * make sure that if BN_CTX_get fails once it will return NULL again
+         * until BN_CTX_end is called.  (This is so that callers have to check
+         * only the last return value.)
+         */
+        if (ctx->depth > BN_CTX_NUM_POS || ctx->tos >= BN_CTX_NUM)
+                {
+                if (!ctx->too_many)
+                        {
+                        BNerr(BN_F_BN_CTX_GET,BN_R_TOO_MANY_TEMPORARY_VARIABLES);
+                        /* disable error code until BN_CTX_end is called: */
+                        ctx->too_many = 1;
+                        }
+                return NULL;
+                }
+        return (&(ctx->bn[ctx->tos++]));
+        }
+
+void BN_CTX_end(BN_CTX *ctx)
+        {
+        if (ctx == NULL) return;
+        assert(ctx->depth > 0);
+        if (ctx->depth == 0)
+                /* should never happen, but we can tolerate it if not in
+                 * debug mode (could be a 'goto err' in the calling function
+                 * before BN_CTX_start was reached) */
+                BN_CTX_start(ctx);
+
+        ctx->too_many = 0;
+        ctx->depth--;
+        if (ctx->depth < BN_CTX_NUM_POS)
+                ctx->tos = ctx->pos[ctx->depth];
+        }