[PATCHv5 2/6] cmd: SCP03: enable and provision command

[Jorge Ramirez-Ortiz]

Enable and provision the SCP03 keys on a TEE controlled secured elemt
from the U-Boot shell.

Executing this command will generate and program new SCP03 encryption
keys on the secure element NVM.

Depending on the TEE implementation, the keys would then be stored in
some persistent storage or better derived from some platform secret
(so they can't be lost).

Signed-off-by: Jorge Ramirez-Ortiz <jorge at foundries.io>
Reviewed-by: Simon Glass <sjg at chromium.org>
---
 cmd/Kconfig  |  8 ++++++++
 cmd/Makefile |  3 +++
 cmd/scp03.c  | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 63 insertions(+)
 create mode 100644 cmd/scp03.c

diff --git a/cmd/Kconfig b/cmd/Kconfig
index 928a2a0a2d..6327374f2c 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -2021,6 +2021,14 @@ config HASH_VERIFY
 	help
 	  Add -v option to verify data against a hash.
 
+config CMD_SCP03
+	bool "scp03 - SCP03 enable and rotate/provision operations"
+	depends on SCP03
+	help
+	  This command provides access to a Trusted Application
+	  running in a TEE to request Secure Channel Protocol 03
+	  (SCP03) enablement and/or rotation of its SCP03 keys.
+
 config CMD_TPM_V1
 	bool
 
diff --git a/cmd/Makefile b/cmd/Makefile
index 176bf925fd..a7017e8452 100644
--- a/cmd/Makefile
+++ b/cmd/Makefile
@@ -193,6 +193,9 @@ obj-$(CONFIG_CMD_BLOB) += blob.o
 # Android Verified Boot 2.0
 obj-$(CONFIG_CMD_AVB) += avb.o
 
+# Foundries.IO SCP03
+obj-$(CONFIG_CMD_SCP03) += scp03.o
+
 obj-$(CONFIG_ARM) += arm/
 obj-$(CONFIG_RISCV) += riscv/
 obj-$(CONFIG_SANDBOX) += sandbox/
diff --git a/cmd/scp03.c b/cmd/scp03.c
new file mode 100644
index 0000000000..655e0bba08
--- /dev/null
+++ b/cmd/scp03.c
@@ -0,0 +1,52 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * (C) Copyright 2021, Foundries.IO
+ *
+ */
+
+#include <common.h>
+#include <command.h>
+#include <env.h>
+#include <scp03.h>
+
+int do_scp03_enable(struct cmd_tbl *cmdtp, int flag, int argc,
+		    char *const argv[])
+{
+	if (argc != 1)
+		return CMD_RET_USAGE;
+
+	if (tee_enable_scp03()) {
+		printf("TEE failed to enable SCP03\n");
+		return CMD_RET_FAILURE;
+	}
+
+	printf("SCP03 is enabled\n");
+
+	return CMD_RET_SUCCESS;
+}
+
+int do_scp03_provision(struct cmd_tbl *cmdtp, int flag, int argc,
+		       char *const argv[])
+{
+	if (argc != 1)
+		return CMD_RET_USAGE;
+
+	if (tee_provision_scp03()) {
+		printf("TEE failed to provision SCP03 keys\n");
+		return CMD_RET_FAILURE;
+	}
+
+	printf("SCP03 is provisioned\n");
+
+	return CMD_RET_SUCCESS;
+}
+
+static char text[] =
+	"provides a command to enable SCP03 and provision the SCP03 keys\n"
+	" enable    - enable SCP03 on the TEE\n"
+	" provision - provision SCP03 on the TEE\n";
+
+U_BOOT_CMD_WITH_SUBCMDS(scp03, "Secure Channel Protocol 03 control", text,
+	U_BOOT_SUBCMD_MKENT(enable, 1, 1, do_scp03_enable),
+	U_BOOT_SUBCMD_MKENT(provision, 1, 1, do_scp03_provision));
+
-- 
2.30.0