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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>
113 lines
2.4 KiB
C
113 lines
2.4 KiB
C
/*
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* Copyright 2014 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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*/
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#include <common.h>
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#include <malloc.h>
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#include <fsl_sec.h>
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#include <asm-generic/errno.h>
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#include "jobdesc.h"
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#include "desc.h"
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#include "jr.h"
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int blob_decap(u8 *key_mod, u8 *src, u8 *dst, u32 len)
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{
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int ret, i = 0;
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u32 *desc;
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printf("\nDecapsulating data to form blob\n");
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desc = malloc(sizeof(int) * MAX_CAAM_DESCSIZE);
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if (!desc) {
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debug("Not enough memory for descriptor allocation\n");
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return -1;
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}
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inline_cnstr_jobdesc_blob_decap(desc, key_mod, src, dst, len);
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for (i = 0; i < 14; i++)
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printf("%x\n", *(desc + i));
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ret = run_descriptor_jr(desc);
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if (ret)
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printf("Error in Decapsulation %d\n", ret);
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free(desc);
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return ret;
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}
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int blob_encap(u8 *key_mod, u8 *src, u8 *dst, u32 len)
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{
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int ret, i = 0;
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u32 *desc;
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printf("\nEncapsulating data to form blob\n");
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desc = malloc(sizeof(int) * MAX_CAAM_DESCSIZE);
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if (!desc) {
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debug("Not enough memory for descriptor allocation\n");
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return -1;
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}
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inline_cnstr_jobdesc_blob_encap(desc, key_mod, src, dst, len);
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for (i = 0; i < 14; i++)
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printf("%x\n", *(desc + i));
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ret = run_descriptor_jr(desc);
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if (ret)
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printf("Error in Encapsulation %d\n", ret);
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free(desc);
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return ret;
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}
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#ifdef CONFIG_CMD_DEKBLOB
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int blob_dek(const u8 *src, u8 *dst, u8 len)
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{
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int ret, size, i = 0;
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u32 *desc;
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int out_sz = WRP_HDR_SIZE + len + KEY_BLOB_SIZE + MAC_SIZE;
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puts("\nEncapsulating provided DEK to form blob\n");
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desc = memalign(ARCH_DMA_MINALIGN,
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sizeof(uint32_t) * DEK_BLOB_DESCSIZE);
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if (!desc) {
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debug("Not enough memory for descriptor allocation\n");
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return -ENOMEM;
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}
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ret = inline_cnstr_jobdesc_blob_dek(desc, src, dst, len);
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if (ret) {
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debug("Error in Job Descriptor Construction: %d\n", ret);
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} else {
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size = roundup(sizeof(uint32_t) * DEK_BLOB_DESCSIZE,
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ARCH_DMA_MINALIGN);
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flush_dcache_range((unsigned long)desc,
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(unsigned long)desc + size);
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size = roundup(sizeof(uint8_t) * out_sz, ARCH_DMA_MINALIGN);
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flush_dcache_range((unsigned long)dst,
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(unsigned long)dst + size);
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ret = run_descriptor_jr(desc);
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}
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if (ret) {
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debug("Error in Encapsulation %d\n", ret);
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goto err;
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}
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size = roundup(out_sz, ARCH_DMA_MINALIGN);
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invalidate_dcache_range((unsigned long)dst, (unsigned long)dst+size);
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puts("DEK Blob\n");
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for (i = 0; i < out_sz; i++)
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printf("%02X", ((uint8_t *)dst)[i]);
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printf("\n");
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err:
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free(desc);
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return ret;
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}
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#endif
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