diff --git a/include/lib/aarch64/arch_features.h b/include/lib/aarch64/arch_features.h
index 5891c7a..20240ec 100644
--- a/include/lib/aarch64/arch_features.h
+++ b/include/lib/aarch64/arch_features.h
@@ -51,7 +51,7 @@
 static inline bool is_armv8_3_pauth_gpa_gpi_present(void)
 {
 	uint64_t mask = (ID_AA64ISAR1_GPI_MASK << ID_AA64ISAR1_GPI_SHIFT) |
-		(ID_AA64ISAR1_GPA_MASK << ID_AA64ISAR1_GPA_SHIFT);
+			(ID_AA64ISAR1_GPA_MASK << ID_AA64ISAR1_GPA_SHIFT);
 
 	return (read_id_aa64isar1_el1() & mask) != 0U;
 }
diff --git a/include/lib/extensions/pauth.h b/include/lib/extensions/pauth.h
new file mode 100644
index 0000000..a4da009
--- /dev/null
+++ b/include/lib/extensions/pauth.h
@@ -0,0 +1,20 @@
+/*
+ * Copyright (c) 2019, Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#ifndef PAUTH_H
+#define PAUTH_H
+
+#include <stdint.h>
+
+#ifdef __aarch64__
+/* Initialize 128-bit ARMv8.3-PAuth key */
+uint128_t init_apkey(void);
+
+/* Program APIAKey_EL1 key and enable ARMv8.3-PAuth */
+void pauth_init_enable(void);
+#endif	/* __aarch64__ */
+
+#endif /* PAUTH_H */