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diff --git a/tests/helpers/c/prng.h b/tests/helpers/c/prng.h
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+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Very simple prng to allow for randomized tests with reproducable
+ * results.
+ *
+ * Copyright (C) 2012 by Open Source Routing.
+ * Copyright (C) 2012 by Internet Systems Consortium, Inc. ("ISC")
+ *
+ * This file is part of Quagga
+ */
+#ifndef _PRNG_H
+#define _PRNG_H
+
+struct prng;
+
+struct prng *prng_new(unsigned long long seed);
+int prng_rand(struct prng *);
+const char *prng_fuzz(struct prng *, const char *string, const char *charset,
+ unsigned int operations);
+void prng_free(struct prng *);
+
+#endif