u-boot/drivers/crypto/fsl/fsl_blob.c
Ruchika Gupta c5de15cbc8 crypto/fsl: Add command for encapsulating/decapsulating blobs
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>
2014-10-16 14:20:40 -07:00

61 lines
1.2 KiB
C

/*
* Copyright 2014 Freescale Semiconductor, Inc.
*
* SPDX-License-Identifier: GPL-2.0+
*
*/
#include <common.h>
#include <malloc.h>
#include "jobdesc.h"
#include "desc.h"
#include "jr.h"
int blob_decrypt(u8 *key_mod, u8 *src, u8 *dst, u8 len)
{
int ret, i = 0;
u32 *desc;
printf("\nDecapsulating data to form blob\n");
desc = malloc(sizeof(int) * MAX_CAAM_DESCSIZE);
if (!desc) {
debug("Not enough memory for descriptor allocation\n");
return -1;
}
inline_cnstr_jobdesc_blob_decap(desc, key_mod, src, dst, len);
for (i = 0; i < 14; i++)
printf("%x\n", *(desc + i));
ret = run_descriptor_jr(desc);
if (ret)
printf("Error in Decapsulation %d\n", ret);
free(desc);
return ret;
}
int blob_encrypt(u8 *key_mod, u8 *src, u8 *dst, u8 len)
{
int ret, i = 0;
u32 *desc;
printf("\nEncapsulating data to form blob\n");
desc = malloc(sizeof(int) * MAX_CAAM_DESCSIZE);
if (!desc) {
debug("Not enough memory for descriptor allocation\n");
return -1;
}
inline_cnstr_jobdesc_blob_encap(desc, key_mod, src, dst, len);
for (i = 0; i < 14; i++)
printf("%x\n", *(desc + i));
ret = run_descriptor_jr(desc);
if (ret)
printf("Error in Encapsulation %d\n", ret);
free(desc);
return ret;
}