From 58c08aa241f168c84ce7cc3052454ea59a44eada Mon Sep 17 00:00:00 2001
From: markus <>
Date: Wed, 7 Apr 2004 20:42:07 +0000
Subject: import openssl-0.9.7d

---
 src/lib/libcrypto/evp/digest.c | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

(limited to 'src/lib/libcrypto/evp/digest.c')

diff --git a/src/lib/libcrypto/evp/digest.c b/src/lib/libcrypto/evp/digest.c
index b22eed4421..0623ddf1f0 100644
--- a/src/lib/libcrypto/evp/digest.c
+++ b/src/lib/libcrypto/evp/digest.c
@@ -248,6 +248,7 @@ int EVP_MD_CTX_copy(EVP_MD_CTX *out, const EVP_MD_CTX *in)
 
 int EVP_MD_CTX_copy_ex(EVP_MD_CTX *out, const EVP_MD_CTX *in)
 	{
+	unsigned char *tmp_buf;
 	if ((in == NULL) || (in->digest == NULL))
 		{
 		EVPerr(EVP_F_EVP_MD_CTX_COPY,EVP_R_INPUT_NOT_INITIALIZED);
@@ -262,15 +263,22 @@ int EVP_MD_CTX_copy_ex(EVP_MD_CTX *out, const EVP_MD_CTX *in)
 		}
 #endif
 
+	if (out->digest == in->digest)
+		{
+		tmp_buf = out->md_data;
+	    	EVP_MD_CTX_set_flags(out,EVP_MD_CTX_FLAG_REUSE);
+		}
+	else tmp_buf = NULL;
 	EVP_MD_CTX_cleanup(out);
 	memcpy(out,in,sizeof *out);
 
 	if (out->digest->ctx_size)
 		{
-		out->md_data=OPENSSL_malloc(out->digest->ctx_size);
+		if (tmp_buf) out->md_data = tmp_buf;
+		else out->md_data=OPENSSL_malloc(out->digest->ctx_size);
 		memcpy(out->md_data,in->md_data,out->digest->ctx_size);
 		}
-	
+
 	if (out->digest->copy)
 		return out->digest->copy(out,in);
 	
@@ -308,7 +316,8 @@ int EVP_MD_CTX_cleanup(EVP_MD_CTX *ctx)
 	if (ctx->digest && ctx->digest->cleanup
 	    && !EVP_MD_CTX_test_flags(ctx,EVP_MD_CTX_FLAG_CLEANED))
 		ctx->digest->cleanup(ctx);
-	if (ctx->digest && ctx->digest->ctx_size && ctx->md_data)
+	if (ctx->digest && ctx->digest->ctx_size && ctx->md_data
+	    && !EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_REUSE))
 		{
 		OPENSSL_cleanse(ctx->md_data,ctx->digest->ctx_size);
 		OPENSSL_free(ctx->md_data);
-- 
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