From: Joel Rosdahl <joel@rosdahl.net>
Date: Wed, 18 Aug 2010 19:41:45 +0000 (+0200)
Subject: Make hash_result() idempotent
X-Git-Tag: v3.1~69
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=e0b2f338539dda2d16fcd7cb7071e903709ee6b3;p=thirdparty%2Fccache.git

Make hash_result() idempotent
---

diff --git a/mdfour.c b/mdfour.c
index 52c2fa02a..541e85772 100644
--- a/mdfour.c
+++ b/mdfour.c
@@ -111,6 +111,7 @@ mdfour_begin(struct mdfour *md)
 	md->D = 0x10325476;
 	md->totalN = 0;
 	md->tail_len = 0;
+	md->finalized = 0;
 }
 
 static
@@ -156,7 +157,10 @@ mdfour_update(struct mdfour *md, const unsigned char *in, size_t n)
 	m = md;
 
 	if (in == NULL) {
-		mdfour_tail(md->tail, md->tail_len);
+		if (!md->finalized) {
+			mdfour_tail(md->tail, md->tail_len);
+			md->finalized = 1;
+		}
 		return;
 	}
 
diff --git a/mdfour.h b/mdfour.h
index 885ad830d..c196a09e9 100644
--- a/mdfour.h
+++ b/mdfour.h
@@ -9,6 +9,7 @@ struct mdfour {
 	size_t totalN;
 	unsigned char tail[64];
 	size_t tail_len;
+	int finalized;
 };
 
 void mdfour_begin(struct mdfour *md);