imx6: Added DEK blob generator command
Freescale's SEC block has built-in Data Encryption
Key(DEK) Blob Protocol which provides a method for
protecting a DEK for non-secure memory storage.
SEC block protects data in a data structure called
a Secret Key Blob, which provides both confidentiality
and integrity protection.
Every time the blob encapsulation is executed,
a AES-256 key is randomly generated to encrypt the DEK.
This key is encrypted with the OTP Secret key
from SoC. The resulting blob consists of the encrypted
AES-256 key, the encrypted DEK, and a 16-bit MAC.
During decapsulation, the reverse process is performed
to get back the original DEK. A caveat to the blob
decapsulation process, is that the DEK is decrypted
in secure-memory and can only be read by FSL SEC HW.
The DEK is used to decrypt data during encrypted boot.
Commands added
--------------
dek_blob - encapsulating DEK as a cryptgraphic blob
Commands Syntax
---------------
dek_blob src dst len
Encapsulate and create blob of a len-bits DEK at
address src and store the result at address dst.
Signed-off-by: Raul Cardenas <Ulises.Cardenas@freescale.com>
Signed-off-by: Nitin Garg <nitin.garg@freescale.com>
Signed-off-by: Ulises Cardenas <ulises.cardenas@freescale.com>
Signed-off-by: Ulises Cardenas-B45798 <Ulises.Cardenas@freescale.com>
diff --git a/arch/arm/imx-common/Makefile b/arch/arm/imx-common/Makefile
index 25a9d4c..606482f 100644
--- a/arch/arm/imx-common/Makefile
+++ b/arch/arm/imx-common/Makefile
@@ -24,6 +24,7 @@
endif
obj-$(CONFIG_CMD_BMODE) += cmd_bmode.o
obj-$(CONFIG_CMD_HDMIDETECT) += cmd_hdmidet.o
+obj-$(CONFIG_CMD_DEKBLOB) += cmd_dek.o
quiet_cmd_cpp_cfg = CFGS $@
cmd_cpp_cfg = $(CPP) $(cpp_flags) -x c -o $@ $<
diff --git a/arch/arm/imx-common/cmd_dek.c b/arch/arm/imx-common/cmd_dek.c
new file mode 100644
index 0000000..d93d5fb
--- /dev/null
+++ b/arch/arm/imx-common/cmd_dek.c
@@ -0,0 +1,91 @@
+/*
+ * Copyright 2008-2015 Freescale Semiconductor, Inc.
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ *
+ * Command for encapsulating DEK blob
+ */
+
+#include <common.h>
+#include <command.h>
+#include <environment.h>
+#include <malloc.h>
+#include <asm/byteorder.h>
+#include <linux/compiler.h>
+#include <fsl_sec.h>
+#include <asm/arch/clock.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/**
+* blob_dek() - Encapsulate the DEK as a blob using CAM's Key
+* @src: - Address of data to be encapsulated
+* @dst: - Desination address of encapsulated data
+* @len: - Size of data to be encapsulated
+*
+* Returns zero on success,and negative on error.
+*/
+static int blob_encap_dek(const u8 *src, u8 *dst, u32 len)
+{
+ int ret = 0;
+ 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 (!((len == 128) | (len == 192) | (len == 256))) {
+ debug("Invalid DEK size. Valid sizes are 128, 192 and 256b\n");
+ return -1;
+ }
+
+ len /= 8;
+ ret = blob_dek(src, dst, len);
+
+ return ret;
+}
+
+/**
+ * do_dek_blob() - Handle the "dek_blob" 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_dek_blob(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
+{
+ uint32_t src_addr, dst_addr, len;
+ uint8_t *src_ptr, *dst_ptr;
+ int ret = 0;
+
+ if (argc != 4)
+ return CMD_RET_USAGE;
+
+ src_addr = simple_strtoul(argv[1], NULL, 16);
+ dst_addr = simple_strtoul(argv[2], NULL, 16);
+ len = simple_strtoul(argv[3], NULL, 10);
+
+ src_ptr = map_sysmem(src_addr, len/8);
+ dst_ptr = map_sysmem(dst_addr, BLOB_SIZE(len/8));
+
+ ret = blob_encap_dek(src_ptr, dst_ptr, len);
+
+ return ret;
+}
+
+/***************************************************/
+static char dek_blob_help_text[] =
+ "src dst len - Encapsulate and create blob of data\n"
+ " $len bits long at address $src and\n"
+ " store the result at address $dst.\n";
+
+U_BOOT_CMD(
+ dek_blob, 4, 1, do_dek_blob,
+ "Data Encryption Key blob encapsulation",
+ dek_blob_help_text
+);
diff --git a/arch/arm/imx-common/timer.c b/arch/arm/imx-common/timer.c
index 65ef60b..e522990 100644
--- a/arch/arm/imx-common/timer.c
+++ b/arch/arm/imx-common/timer.c
@@ -176,3 +176,20 @@
{
return gpt_get_clk();
}
+
+/*
+ * This function is intended for SHORT delays only.
+ * It will overflow at around 10 seconds @ 400MHz,
+ * or 20 seconds @ 200MHz.
+ */
+unsigned long usec2ticks(unsigned long usec)
+{
+ ulong ticks;
+
+ if (usec < 1000)
+ ticks = ((usec * (get_tbclk()/1000)) + 500) / 1000;
+ else
+ ticks = ((usec / 10) * (get_tbclk() / 100000));
+
+ return ticks;
+}
diff --git a/arch/arm/include/asm/arch-mx6/imx-regs.h b/arch/arm/include/asm/arch-mx6/imx-regs.h
index ae88b6e..9a4ad8b 100644
--- a/arch/arm/include/asm/arch-mx6/imx-regs.h
+++ b/arch/arm/include/asm/arch-mx6/imx-regs.h
@@ -215,6 +215,10 @@
#define AIPS2_OFF_BASE_ADDR (ATZ2_BASE_ADDR + 0x80000)
#define CAAM_BASE_ADDR (ATZ2_BASE_ADDR)
#define ARM_BASE_ADDR (ATZ2_BASE_ADDR + 0x40000)
+
+#define CONFIG_SYS_FSL_SEC_ADDR CAAM_BASE_ADDR
+#define CONFIG_SYS_FSL_JR0_ADDR (CAAM_BASE_ADDR + 0x1000)
+
#define USB_PL301_BASE_ADDR (AIPS2_OFF_BASE_ADDR + 0x0000)
#define USB_BASE_ADDR (AIPS2_OFF_BASE_ADDR + 0x4000)