From: Joel Rosdahl <joel@rosdahl.net>
Date: Fri, 13 Aug 2010 20:58:06 +0000 (+0200)
Subject: Add hash_equal() function
X-Git-Tag: v3.1~85
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=65c847fa22931ee4aae172d9b5f9ffdd44484d93;p=thirdparty%2Fccache.git

Add hash_equal() function
---

diff --git a/ccache.h b/ccache.h
index a317100f8..8ddc533b2 100644
--- a/ccache.h
+++ b/ccache.h
@@ -71,6 +71,7 @@ void hash_start(struct mdfour *md);
 void hash_buffer(struct mdfour *md, const void *s, size_t len);
 char *hash_result(struct mdfour *md);
 void hash_result_as_bytes(struct mdfour *md, unsigned char *out);
+int hash_equal(struct mdfour *md1, struct mdfour *md2);
 void hash_delimiter(struct mdfour *md, const char* type);
 void hash_string(struct mdfour *md, const char *s);
 void hash_int(struct mdfour *md, int x);
diff --git a/hash.c b/hash.c
index d6b95bcd4..6220a545f 100644
--- a/hash.c
+++ b/hash.c
@@ -58,6 +58,15 @@ hash_result_as_bytes(struct mdfour *md, unsigned char *out)
 	mdfour_result(md, out);
 }
 
+int
+hash_equal(struct mdfour *md1, struct mdfour *md2)
+{
+	unsigned char sum1[16], sum2[16];
+	hash_result_as_bytes(md1, sum1);
+	hash_result_as_bytes(md2, sum2);
+	return memcmp(sum1, sum2, sizeof(sum1)) == 0;
+}
+
 /*
  * Hash some data that is unlikely to occur in the input. The idea is twofold:
  *