1 files changed, 42 insertions, 0 deletions
diff --git a/lib/isc/iterated_hash.c b/lib/isc/iterated_hash.c
new file mode 100644
index 0000000..cf4e67f
--- /dev/null
+++ b/lib/isc/iterated_hash.c
@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+
+#include "config.h"
+
+#include <stdio.h>
+
+#include <isc/sha1.h>
+#include <isc/iterated_hash.h>
+
+int
+isc_iterated_hash(unsigned char out[ISC_SHA1_DIGESTLENGTH],
+		  unsigned int hashalg, int iterations,
+		  const unsigned char *salt, int saltlength,
+		  const unsigned char *in, int inlength)
+{
+	isc_sha1_t ctx;
+	int n = 0;
+
+	if (hashalg != 1)
+		return (0);
+
+	do {
+		isc_sha1_init(&ctx);
+		isc_sha1_update(&ctx, in, inlength);
+		isc_sha1_update(&ctx, salt, saltlength);
+		isc_sha1_final(&ctx, out);
+		in = out;
+		inlength = ISC_SHA1_DIGESTLENGTH;
+	} while (n++ < iterations);
+
+	return (ISC_SHA1_DIGESTLENGTH);
+}