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c5de15cbc8
Freescale's SEC block has built-in Blob Protocol which provides
a method for protecting user-defined data across system power
cycles. SEC block protects data in a data structure called a Blob,
which provides both confidentiality and integrity protection.
Encapsulating data as a blob
Each time that the Blob Protocol is used to protect data, a
different randomly generated key is used to encrypt the data.
This random key is itself encrypted using a key which is derived
from SoC's non volatile secret key and a 16 bit Key identifier.
The resulting encrypted key along with encrypted data is called a blob.
The non volatile secure key is available for use only during secure boot.
During decapsulation, the reverse process is performed to get back
the original data.
Commands added
--------------
blob enc - encapsulating data as a cryptgraphic blob
blob dec - decapsulating cryptgraphic blob to get the data
Commands Syntax
---------------
blob enc src dst len km
Encapsulate and create blob of data $len bytes long
at address $src and store the result at address $dst.
$km is the 16 byte key modifier is also required for
generation/use as key for cryptographic operation. Key
modifier should be 16 byte long.
blob dec src dst len km
Decapsulate the blob of data at address $src and
store result of $len byte at addr $dst.
$km is the 16 byte key modifier is also required for
generation/use as key for cryptographic operation. Key
modifier should be 16 byte long.
Signed-off-by: Ruchika Gupta <ruchika.gupta@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>
62 lines
1.2 KiB
C
62 lines
1.2 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 "jobdesc.h"
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#include "desc.h"
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#include "jr.h"
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int blob_decrypt(u8 *key_mod, u8 *src, u8 *dst, u8 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_encrypt(u8 *key_mod, u8 *src, u8 *dst, u8 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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