From 9b141126d4b6f0636bc047e81b846c193ae26611 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ulf=20M=C3=B6ller?= <ulf@openssl.org>
Date: Sat, 5 Feb 2000 14:17:32 +0000
Subject: New functions BN_CTX_start(), BN_CTX_get(), BN_CTX_end() to access
 temporary BIGNUMs. BN_CTX still uses a fixed number of BIGNUMs, but the
 BN_CTX implementation could now easily be changed.

---
 crypto/dh/dh_gen.c | 13 +++++++++----
 crypto/dh/dh_key.c |  4 +++-
 2 files changed, 12 insertions(+), 5 deletions(-)

(limited to 'crypto/dh')

diff --git a/crypto/dh/dh_gen.c b/crypto/dh/dh_gen.c
index f0ee43ed87..7a6a38fbb4 100644
--- a/crypto/dh/dh_gen.c
+++ b/crypto/dh/dh_gen.c
@@ -95,9 +95,10 @@ DH *DH_generate_parameters(int prime_len, int generator,
 	if (ret == NULL) goto err;
 	ctx=BN_CTX_new();
 	if (ctx == NULL) goto err;
-	t1= &(ctx->bn[0]);
-	t2= &(ctx->bn[1]);
-	ctx->tos=2;
+	BN_CTX_start(ctx);
+	t1 = BN_CTX_get(ctx);
+	t2 = BN_CTX_get(ctx);
+	if (t1 == NULL || t2 == NULL) goto err;
 	
 	if (generator == DH_GENERATOR_2)
 		{
@@ -138,7 +139,11 @@ err:
 		ok=0;
 		}
 
-	if (ctx != NULL) BN_CTX_free(ctx);
+	if (ctx != NULL)
+		{
+		BN_CTX_end(ctx);
+		BN_CTX_free(ctx);
+		}
 	if (!ok && (ret != NULL))
 		{
 		DH_free(ret);
diff --git a/crypto/dh/dh_key.c b/crypto/dh/dh_key.c
index 4e6a0fc0ef..0c7eeaf260 100644
--- a/crypto/dh/dh_key.c
+++ b/crypto/dh/dh_key.c
@@ -161,7 +161,8 @@ static int compute_key(unsigned char *key, BIGNUM *pub_key, DH *dh)
 	int ret= -1;
 
 	BN_CTX_init(&ctx);
-	tmp= &(ctx.bn[ctx.tos++]);
+	BN_CTX_start(&ctx);
+	tmp = BN_CTX_get(&ctx);
 	
 	if (dh->priv_key == NULL)
 		{
@@ -184,6 +185,7 @@ static int compute_key(unsigned char *key, BIGNUM *pub_key, DH *dh)
 
 	ret=BN_bn2bin(tmp,key);
 err:
+	BN_CTX_end(&ctx);
 	BN_CTX_free(&ctx);
 	return(ret);
 	}
-- 
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