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authorRaul Cardenas <Ulises.Cardenas@freescale.com>2015-02-27 11:22:06 -0600
committerStefano Babic <sbabic@denx.de>2015-03-02 09:57:06 +0100
commit0200020bc2b8192c31dc57c600865267f51bface (patch)
tree77e47e958773096b7cb53c20a0c6a1f4d83e46d8 /arch/arm/imx-common
parentb5cd10b911f632f74e1211ef786989781d2a1ca1 (diff)
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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>
Diffstat (limited to 'arch/arm/imx-common')
-rw-r--r--arch/arm/imx-common/Makefile1
-rw-r--r--arch/arm/imx-common/cmd_dek.c91
-rw-r--r--arch/arm/imx-common/timer.c17
3 files changed, 109 insertions, 0 deletions
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 @@ obj-$(CONFIG_IMX_VIDEO_SKIP) += video.o
endif
obj-$(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 @@ ulong get_tbclk(void)
{
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;
+}