1 files changed, 44 insertions, 0 deletions
diff --git a/libglusterfs/src/checksum.c b/libglusterfs/src/checksum.c
new file mode 100644
index 00000000000..acdaed04ae2
--- /dev/null
+++ b/libglusterfs/src/checksum.c
@@ -0,0 +1,44 @@
+/*
+  Copyright (c) 2008-2012 Red Hat, Inc. <http://www.redhat.com>
+  This file is part of GlusterFS.
+
+  This file is licensed to you under your choice of the GNU Lesser
+  General Public License, version 3 or any later version (LGPLv3 or
+  later), or the GNU General Public License, version 2 (GPLv2), in all
+  cases as published by the Free Software Foundation.
+*/
+
+#include <openssl/md5.h>
+#include <openssl/sha.h>
+#include <zlib.h>
+#include <stdint.h>
+#include <string.h>
+
+/*
+ * The "weak" checksum required for the rsync algorithm.
+ *
+ * Note: these functions are only called to compute checksums on
+ * pathnames; they don't need to handle arbitrarily long strings of
+ * data. Thus int32_t and uint32_t are sufficient
+ */
+uint32_t
+gf_rsync_weak_checksum(unsigned char *buf, size_t len)
+{
+    return adler32(0, buf, len);
+}
+
+/*
+ * The "strong" checksum required for the rsync algorithm.
+ */
+void
+gf_rsync_strong_checksum(unsigned char *data, size_t len,
+                         unsigned char *sha256_md)
+{
+    SHA256((const unsigned char *)data, len, sha256_md);
+}
+
+void
+gf_rsync_md5_checksum(unsigned char *data, size_t len, unsigned char *md5)
+{
+    MD5(data, len, md5);
+}