imx: imx7 Support for Manufacturing Protection

This code was originally developed by Raul Cardenas <raul.casas@nxp.com>
and modified to be applied in U-Boot imx_v2017.03.

More information about the initial submission can be seen
in the link below:
https://lists.denx.de/pipermail/u-boot/2016-February/245273.html

i.MX7D has an a protection feature for Manufacturing process.
This feature uses asymmetric encryption to sign and verify
authenticated software handled between parties. This command
enables the use of such feature.

The private key is unique and generated once per device.
And it is stored in secure memory and only accessible by CAAM.
Therefore, the public key generation and signature functions
are the only functions available for the user.

The manufacturing-protection authentication process can be used to
authenticate the chip to the OEM's server.

Command usage:

Print the public key for the device.
- mfgprot pubk

Generates Signature over given data.
- mfgprot sign <data_address> <data_size>

Signed-off-by: Raul Ulises Cardenas <raul.casas@nxp.com>
Signed-off-by: Breno Lima <breno.lima@nxp.com>
Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>
Reviewed-by: Ye Li <ye.li@nxp.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>

3 files changed, 160 insertions, 0 deletions

diff --git a/arch/arm/mach-imx/Kconfig b/arch/arm/mach-imx/Kconfig
index 8f64e23195..6d40c7fc4b 100644
--- a/arch/arm/mach-imx/Kconfig
+++ b/arch/arm/mach-imx/Kconfig
@@ -99,6 +99,15 @@ config CMD_NANDBCB
 	  This is similar to kobs-ng, which is used in Linux as separate
 	  rootfs package.
 
+config FSL_MFGPROT
+	bool "Support the 'mfgprot' command"
+	depends on IMX_HAB && ARCH_MX7
+	help
+	  This option enables the manufacturing protection command
+	  which can be used has a protection feature for Manufacturing
+	  process. With this tool is possible to authenticate the
+	  chip to the OEM's server.
+
 config NXP_BOARD_REVISION
 	bool "Read NXP board revision from fuses"
 	depends on ARCH_MX6 || ARCH_MX7
diff --git a/arch/arm/mach-imx/Makefile b/arch/arm/mach-imx/Makefile
index e6b4654cd3..25f910b36a 100644
--- a/arch/arm/mach-imx/Makefile
+++ b/arch/arm/mach-imx/Makefile
@@ -35,6 +35,7 @@ ifeq ($(SOC),$(filter $(SOC),mx7))
 obj-y 	+= cpu.o
 obj-$(CONFIG_SYS_I2C_MXC) += i2c-mxv7.o
 obj-$(CONFIG_ENV_IS_IN_MMC) += mmc_env.o
+obj-$(CONFIG_FSL_MFGPROT) += cmd_mfgprot.o
 endif
 ifeq ($(SOC),$(filter $(SOC),mx5 mx6 mx7))
 obj-$(CONFIG_IMX_VIDEO_SKIP) += video.o
diff --git a/arch/arm/mach-imx/cmd_mfgprot.c b/arch/arm/mach-imx/cmd_mfgprot.c
new file mode 100644
index 0000000000..03fc7014e1
--- /dev/null
+++ b/arch/arm/mach-imx/cmd_mfgprot.c
@@ -0,0 +1,150 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2016 Freescale Semiconductor, Inc.
+ * Copyright 2017 NXP
+ *
+ * These commands enable the use of the CAAM MPPubK-generation and MPSign
+ * functions in supported i.MX devices.
+ */
+
+#include <asm/byteorder.h>
+#include <asm/arch/clock.h>
+#include <linux/compiler.h>
+#include <command.h>
+#include <common.h>
+#include <environment.h>
+#include <fsl_sec.h>
+#include <mapmem.h>
+#include <memalign.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/**
+ * do_mfgprot() - Handle the "mfgprot" command-line command
+ * @cmdtp:  Command data struct pointer
+ * @flag:   Command flag
+ * @argc:   Command-line argument count
+ * @argv:   Array of command-line arguments
+ *
+ * Returns zero on success, CMD_RET_USAGE in case of misuse and negative
+ * on error.
+ */
+static int do_mfgprot(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
+{
+	u8 *m_ptr, *dgst_ptr, *c_ptr, *d_ptr, *dst_ptr;
+	char *pubk, *sign, *sel;
+	int m_size, i, ret;
+	u32 m_addr;
+
+	pubk = "pubk";
+	sign = "sign";
+	sel = argv[1];
+
+	/* Enable HAB clock */
+	u32 jr_size = 4;
+	u32 out_jr_size = sec_in32(CONFIG_SYS_FSL_JR0_ADDR + 0x102c);
+
+	if (out_jr_size != jr_size) {
+		hab_caam_clock_enable(1);
+		sec_init();
+	}
+
+	if (strcmp(sel, pubk) == 0) {
+		dst_ptr = malloc_cache_aligned(FSL_CAAM_MP_PUBK_BYTES);
+		if (!dst_ptr)
+			return -ENOMEM;
+
+		ret = gen_mppubk(dst_ptr);
+		if (ret) {
+			free(dst_ptr);
+			return ret;
+		}
+
+		/* Output results */
+		puts("Public key:\n");
+		for (i = 0; i < FSL_CAAM_MP_PUBK_BYTES; i++)
+			printf("%02X", (dst_ptr)[i]);
+		puts("\n");
+		free(dst_ptr);
+
+	} else if (strcmp(sel, sign) == 0) {
+		if (argc != 4)
+			return CMD_RET_USAGE;
+
+		m_addr = simple_strtoul(argv[2], NULL, 16);
+		m_size = simple_strtoul(argv[3], NULL, 10);
+		m_ptr = map_physmem(m_addr, m_size, MAP_NOCACHE);
+		if (!m_ptr)
+			return -ENOMEM;
+
+		dgst_ptr = malloc_cache_aligned(FSL_CAAM_MP_MES_DGST_BYTES);
+		if (!dgst_ptr) {
+			ret = -ENOMEM;
+			goto free_m;
+		}
+
+		c_ptr = malloc_cache_aligned(FSL_CAAM_MP_PRVK_BYTES);
+		if (!c_ptr) {
+			ret = -ENOMEM;
+			goto free_dgst;
+		}
+
+		d_ptr = malloc_cache_aligned(FSL_CAAM_MP_PRVK_BYTES);
+		if (!d_ptr) {
+			ret = -ENOMEM;
+			goto free_c;
+		}
+
+		ret = sign_mppubk(m_ptr, m_size, dgst_ptr, c_ptr, d_ptr);
+		if (ret)
+			goto free_d;
+
+		/* Output results */
+		puts("Message: ");
+		for (i = 0; i < m_size; i++)
+			printf("%02X ", (m_ptr)[i]);
+		puts("\n");
+
+		puts("Message Representative Digest(SHA-256):\n");
+		for (i = 0; i < FSL_CAAM_MP_MES_DGST_BYTES; i++)
+			printf("%02X", (dgst_ptr)[i]);
+		puts("\n");
+
+		puts("Signature:\n");
+		puts("C:\n");
+		for (i = 0; i < FSL_CAAM_MP_PRVK_BYTES; i++)
+			printf("%02X", (c_ptr)[i]);
+		puts("\n");
+
+		puts("d:\n");
+		for (i = 0; i < FSL_CAAM_MP_PRVK_BYTES; i++)
+			printf("%02X", (d_ptr)[i]);
+		puts("\n");
+free_d:
+	free(d_ptr);
+free_c:
+	free(c_ptr);
+free_dgst:
+	free(dgst_ptr);
+free_m:
+	unmap_sysmem(m_ptr);
+
+	} else {
+		return CMD_RET_USAGE;
+	}
+	return ret;
+}
+
+/***************************************************/
+static char mfgprot_help_text[] =
+	"Usage:\n"
+	 "Print the public key for Manufacturing Protection\n"
+	 "\tmfgprot pubk\n"
+	 "Generates a Manufacturing Protection signature\n"
+	 "\tmfgprot sign <data_addr> <size>";
+
+U_BOOT_CMD(
+	mfgprot, 4, 1, do_mfgprot,
+	"Manufacturing Protection\n",
+	mfgprot_help_text
+);