[PATCH v5 15/16] cmd: verify: initial import

[Philippe Reynes]

Add the command verify that check the signature of
an image with the pre-load header. If the check
succeed, the u-boot env variable 'loadaddr_verified'
is set to the address of the image (without the header).

It allows to run such commands:
tftp script.img && verify $loadaddr && source $loadaddr_verified

Signed-off-by: Philippe Reynes <philippe.reynes at softathome.com>
---
 cmd/Kconfig  |  7 +++++++
 cmd/Makefile |  1 +
 cmd/verify.c | 53 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 61 insertions(+)
 create mode 100644 cmd/verify.c

diff --git a/cmd/Kconfig b/cmd/Kconfig
index 87aa3fb11a..0460d5c3a0 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -428,6 +428,13 @@ config CMD_THOR_DOWNLOAD
 	  There is no documentation about this within the U-Boot source code
 	  but you should be able to find something on the interwebs.
 
+config CMD_VERIFY
+	bool "verify the global signature"
+        depends on CMD_BOOTM_PRE_LOAD
+	help
+	  Verify the signature provided in a pre-load header of
+	  a full image.
+
 config CMD_ZBOOT
 	bool "zboot - x86 boot command"
 	help
diff --git a/cmd/Makefile b/cmd/Makefile
index 166c652d98..80e054e806 100644
--- a/cmd/Makefile
+++ b/cmd/Makefile
@@ -177,6 +177,7 @@ obj-$(CONFIG_CMD_THOR_DOWNLOAD) += thordown.o
 obj-$(CONFIG_CMD_XIMG) += ximg.o
 obj-$(CONFIG_CMD_YAFFS2) += yaffs2.o
 obj-$(CONFIG_CMD_SPL) += spl.o
+obj-$(CONFIG_CMD_VERIFY) += verify.o
 obj-$(CONFIG_CMD_W1) += w1.o
 obj-$(CONFIG_CMD_ZIP) += zip.o
 obj-$(CONFIG_CMD_ZFS) += zfs.o
diff --git a/cmd/verify.c b/cmd/verify.c
new file mode 100644
index 0000000000..4d055e0790
--- /dev/null
+++ b/cmd/verify.c
@@ -0,0 +1,53 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2022 Philippe Reynes <philippe.reynes at softathome.com>
+ */
+
+#include <common.h>
+#include <env.h>
+#include <image.h>
+#include <mapmem.h>
+
+static ulong verify_get_addr(int argc, char *const argv[])
+{
+	ulong addr;
+
+	if (argc > 0)
+		addr = simple_strtoul(argv[0], NULL, 16);
+	else
+		addr = image_load_addr;
+
+	return addr;
+}
+
+static int do_verify(struct cmd_tbl *cmdtp, int flag, int argc,
+		     char *const argv[])
+{
+	ulong addr = verify_get_addr(argc, argv);
+	int ret = 0;
+
+	argc--; argv++;
+
+	addr = verify_get_addr(argc, argv);
+
+	if (CONFIG_IS_ENABLED(CMD_BOOTM_PRE_LOAD)) {
+		ret = image_pre_load(addr);
+
+		if (ret) {
+			ret = CMD_RET_FAILURE;
+			goto out;
+		}
+
+		env_set_hex("loadaddr_verified", addr + image_load_offset);
+	}
+
+ out:
+	return ret;
+}
+
+U_BOOT_CMD(verify, 2, 1, do_verify,
+	   "verify the global signature provided in the pre-load header,\n"
+	   "\tif the check succeed, the u-boot env variable loadaddr_verified\n"
+	   "\tis set to the address of the image (without the header)",
+	   "<image addr>"
+);
-- 
2.17.1