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diff --git a/tests/hex.h b/tests/hex.h
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+/*
+ * Copyright (C) 2017 Red Hat, Inc.
+ *
+ * Author: Nikos Mavrogiannopoulos
+ *
+ * This file is part of GnuTLS.
+ *
+ * GnuTLS is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * GnuTLS is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>
+ */
+
+#ifndef GNUTLS_TESTS_HEX_H
+#define GNUTLS_TESTS_HEX_H
+
+#include <stdio.h>
+#include <string.h>
+#include <gnutls/gnutls.h>
+
+inline static gnutls_datum_t SHEX(const char *hex)
+{
+	gnutls_datum_t input, output;
+	int ret;
+
+	input.data = (void*)hex;
+	input.size = strlen(hex);
+
+	ret = gnutls_hex_decode2(&input, &output);
+	assert_int_equal(ret, 0);
+	return output;
+}
+
+inline static gnutls_datum_t SDATA(const char *txt)
+{
+	gnutls_datum_t output;
+	output.data = (void*)gnutls_strdup(txt);
+	output.size = strlen(txt);
+	return output;
+}
+
+#endif /* GNUTLS_TESTS_HEX_H */