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-rw-r--r--lib/isc/iterated_hash.c64
1 files changed, 64 insertions, 0 deletions
diff --git a/lib/isc/iterated_hash.c b/lib/isc/iterated_hash.c
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+++ b/lib/isc/iterated_hash.c
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+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * SPDX-License-Identifier: MPL-2.0
+ *
+ * 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 https://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+#include <stdio.h>
+
+#include <openssl/opensslv.h>
+#include <openssl/sha.h>
+
+#include <isc/iterated_hash.h>
+#include <isc/thread.h>
+#include <isc/util.h>
+
+int
+isc_iterated_hash(unsigned char *out, const unsigned int hashalg,
+ const int iterations, const unsigned char *salt,
+ const int saltlength, const unsigned char *in,
+ const int inlength) {
+ REQUIRE(out != NULL);
+
+ int n = 0;
+ size_t len;
+ const unsigned char *buf;
+ SHA_CTX ctx;
+
+ if (hashalg != 1) {
+ return (0);
+ }
+
+ buf = in;
+ len = inlength;
+
+ do {
+ if (SHA1_Init(&ctx) != 1) {
+ return (0);
+ }
+
+ if (SHA1_Update(&ctx, buf, len) != 1) {
+ return (0);
+ }
+
+ if (SHA1_Update(&ctx, salt, saltlength) != 1) {
+ return (0);
+ }
+
+ if (SHA1_Final(out, &ctx) != 1) {
+ return (0);
+ }
+
+ buf = out;
+ len = SHA_DIGEST_LENGTH;
+ } while (n++ < iterations);
+
+ return (SHA_DIGEST_LENGTH);
+}