plat/arm/rddaniel: add platform function to return ROTPK

TBBR authentication framework depends on the plat_get_rotpk_info()
function to return the pointer to the Root of Trust Public Key (ROTPK)
stored in the platform along with its length. Add this function for
RD-Daniel platform to support Trusted Board Boot. The function makes use
of the wrapper function provided by the arm common trusted board boot
function to get the ROTPK hash.

Change-Id: I6c2826a7898664afea19fd62432684cfddd9319a
Signed-off-by: Vijayenthiran Subramaniam <vijayenthiran.subramaniam@arm.com>

plat/arm/board/rddaniel/platform.mk

@@ -32,6 +32,11 @@ BL31_SOURCES		+=	${SGI_CPU_SOURCES}			\
 				lib/utils/mem_region.c			\
 				plat/arm/common/arm_nor_psci_mem_protect.c
 
+ifeq (${TRUSTED_BOARD_BOOT}, 1)
+BL1_SOURCES		+=	${RDDANIEL_BASE}/rddaniel_trusted_boot.c
+BL2_SOURCES		+=	${RDDANIEL_BASE}/rddaniel_trusted_boot.c
+endif
+
 # Add the FDT_SOURCES and options for Dynamic Config
 FDT_SOURCES		+=	${RDDANIEL_BASE}/fdts/${PLAT}_fw_config.dts	\
 				${RDDANIEL_BASE}/fdts/${PLAT}_tb_fw_config.dts

plat/arm/board/rddaniel/rddaniel_trusted_boot.c

@@ -0,0 +1,26 @@
+/*
+ * Copyright (c) 2020, Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <plat/arm/common/plat_arm.h>
+
+/*
+ * Return the ROTPK hash in the following ASN.1 structure in DER format:
+ *
+ * AlgorithmIdentifier  ::=  SEQUENCE  {
+ *     algorithm         OBJECT IDENTIFIER,
+ *     parameters        ANY DEFINED BY algorithm OPTIONAL
+ * }
+ *
+ * DigestInfo ::= SEQUENCE {
+ *     digestAlgorithm   AlgorithmIdentifier,
+ *     digest            OCTET STRING
+ * }
+ */
+int plat_get_rotpk_info(void *cookie, void **key_ptr, unsigned int *key_len,
+			unsigned int *flags)
+{
+	return arm_get_rotpk_info(cookie, key_ptr, key_len, flags);
+}