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0200020bc2
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>
91 lines
2.2 KiB
C
91 lines
2.2 KiB
C
/*
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* Copyright 2008-2015 Freescale Semiconductor, Inc.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*
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* Command for encapsulating DEK blob
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*/
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#include <common.h>
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#include <command.h>
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#include <environment.h>
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#include <malloc.h>
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#include <asm/byteorder.h>
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#include <linux/compiler.h>
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#include <fsl_sec.h>
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#include <asm/arch/clock.h>
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DECLARE_GLOBAL_DATA_PTR;
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/**
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* blob_dek() - Encapsulate the DEK as a blob using CAM's Key
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* @src: - Address of data to be encapsulated
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* @dst: - Desination address of encapsulated data
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* @len: - Size of data to be encapsulated
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*
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* Returns zero on success,and negative on error.
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*/
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static int blob_encap_dek(const u8 *src, u8 *dst, u32 len)
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{
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int ret = 0;
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u32 jr_size = 4;
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u32 out_jr_size = sec_in32(CONFIG_SYS_FSL_JR0_ADDR + 0x102c);
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if (out_jr_size != jr_size) {
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hab_caam_clock_enable(1);
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sec_init();
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}
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if (!((len == 128) | (len == 192) | (len == 256))) {
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debug("Invalid DEK size. Valid sizes are 128, 192 and 256b\n");
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return -1;
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}
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len /= 8;
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ret = blob_dek(src, dst, len);
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return ret;
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}
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/**
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* do_dek_blob() - Handle the "dek_blob" command-line command
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* @cmdtp: Command data struct pointer
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* @flag: Command flag
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* @argc: Command-line argument count
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* @argv: Array of command-line arguments
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*
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* Returns zero on success, CMD_RET_USAGE in case of misuse and negative
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* on error.
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*/
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static int do_dek_blob(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
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{
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uint32_t src_addr, dst_addr, len;
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uint8_t *src_ptr, *dst_ptr;
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int ret = 0;
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if (argc != 4)
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return CMD_RET_USAGE;
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src_addr = simple_strtoul(argv[1], NULL, 16);
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dst_addr = simple_strtoul(argv[2], NULL, 16);
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len = simple_strtoul(argv[3], NULL, 10);
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src_ptr = map_sysmem(src_addr, len/8);
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dst_ptr = map_sysmem(dst_addr, BLOB_SIZE(len/8));
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ret = blob_encap_dek(src_ptr, dst_ptr, len);
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return ret;
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}
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/***************************************************/
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static char dek_blob_help_text[] =
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"src dst len - Encapsulate and create blob of data\n"
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" $len bits long at address $src and\n"
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" store the result at address $dst.\n";
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U_BOOT_CMD(
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dek_blob, 4, 1, do_dek_blob,
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"Data Encryption Key blob encapsulation",
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dek_blob_help_text
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);
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