TBB: switch to the new authentication framework

This patch modifies the Trusted Board Boot implementation to use
the new authentication framework, making use of the authentication
module, the cryto module and the image parser module to
authenticate the images in the Chain of Trust.

A new function 'load_auth_image()' has been implemented. When TBB
is enabled, this function will call the authentication module to
authenticate parent images following the CoT up to the root of
trust to finally load and authenticate the requested image.

The platform is responsible for picking up the right makefiles to
build the corresponding cryptographic and image parser libraries.
ARM platforms use the mbedTLS based libraries.

The platform may also specify what key algorithm should be used
to sign the certificates. This is done by declaring the 'KEY_ALG'
variable in the platform makefile. FVP and Juno use ECDSA keys.

On ARM platforms, BL2 and BL1-RW regions have been increased 4KB
each to accommodate the ECDSA code.

REMOVED BUILD OPTIONS:

  * 'AUTH_MOD'

Change-Id: I47d436589fc213a39edf5f5297bbd955f15ae867

2 files changed, 53 insertions, 62 deletions

diff --git a/common/auth.c b/common/auth.c
deleted file mode 100644
index 37234b8e..00000000
--- a/common/auth.c
+++ /dev/null
@@ -1,61 +0,0 @@
-/*
- * Copyright (c) 2015, ARM Limited and Contributors. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- * Redistributions of source code must retain the above copyright notice, this
- * list of conditions and the following disclaimer.
- *
- * Redistributions in binary form must reproduce the above copyright notice,
- * this list of conditions and the following disclaimer in the documentation
- * and/or other materials provided with the distribution.
- *
- * Neither the name of ARM nor the names of its contributors may be used
- * to endorse or promote products derived from this software without specific
- * prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
- * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
- * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
- * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- */
-
-#include <assert.h>
-#include <auth.h>
-#include <debug.h>
-
-/*
- * Initialize the authentication module
- */
-void auth_init(void)
-{
-	assert(auth_mod.name);
-	assert(auth_mod.init);
-	assert(auth_mod.verify);
-
-	INFO("Using authentication module '%s'\n", auth_mod.name);
-	if (auth_mod.init() != 0)
-		assert(0);
-}
-
-/*
- * Authenticate a certificate/image
- *
- * Return: 0 = success, Otherwise = error
- */
-int auth_verify_obj(unsigned int obj_id, uintptr_t obj_buf, size_t len)
-{
-	assert(obj_id < AUTH_NUM_OBJ);
-	assert(obj_buf != 0);
-	assert(auth_mod.verify);
-
-	return auth_mod.verify(obj_id, obj_buf, len);
-}
diff --git a/common/bl_common.c b/common/bl_common.c
index c8ec4e82..b8558a69 100644
--- a/common/bl_common.c
+++ b/common/bl_common.c
@@ -31,6 +31,7 @@
 #include <arch.h>
 #include <arch_helpers.h>
 #include <assert.h>
+#include <auth_mod.h>
 #include <bl_common.h>
 #include <debug.h>
 #include <errno.h>
@@ -209,7 +210,7 @@ unsigned long image_size(unsigned int image_id)
  ******************************************************************************/
 int load_image(meminfo_t *mem_layout,
 	       unsigned int image_id,
-	       uint64_t image_base,
+	       uintptr_t image_base,
 	       image_info_t *image_data,
 	       entry_point_info_t *entry_point_info)
 {
@@ -308,3 +309,54 @@ exit:
 
 	return io_result;
 }
+
+/*******************************************************************************
+ * Generic function to load and authenticate an image. The image is actually
+ * loaded by calling the 'load_image()' function. In addition, this function
+ * uses recursion to authenticate the parent images up to the root of trust.
+ ******************************************************************************/
+int load_auth_image(meminfo_t *mem_layout,
+		    unsigned int image_id,
+		    uintptr_t image_base,
+		    image_info_t *image_data,
+		    entry_point_info_t *entry_point_info)
+{
+	int rc;
+
+#if TRUSTED_BOARD_BOOT
+	unsigned int parent_id;
+
+	/* Use recursion to authenticate parent images */
+	rc = auth_mod_get_parent_id(image_id, &parent_id);
+	if (rc == 0) {
+		rc = load_auth_image(mem_layout, parent_id, image_base,
+				     image_data, NULL);
+		if (rc != IO_SUCCESS) {
+			return rc;
+		}
+	}
+#endif /* TRUSTED_BOARD_BOOT */
+
+	/* Load the image */
+	rc = load_image(mem_layout, image_id, image_base, image_data,
+			entry_point_info);
+	if (rc != IO_SUCCESS) {
+		return rc;
+	}
+
+#if TRUSTED_BOARD_BOOT
+	/* Authenticate it */
+	rc = auth_mod_verify_img(image_id,
+				 (void *)image_data->image_base,
+				 image_data->image_size);
+	if (rc != 0) {
+		return IO_FAIL;
+	}
+
+	/* After working with data, invalidate the data cache */
+	inv_dcache_range(image_data->image_base,
+			(size_t)image_data->image_size);
+#endif /* TRUSTED_BOARD_BOOT */
+
+	return IO_SUCCESS;
+}