u-boot/drivers/crypto/fsl/fsl_blob.c

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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>
2014-10-07 10:16:20 +00:00
/*
* Copyright 2014 Freescale Semiconductor, Inc.
*
* SPDX-License-Identifier: GPL-2.0+
*
*/
#include <common.h>
#include <malloc.h>
#include <fsl_sec.h>
#include <asm-generic/errno.h>
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>
2014-10-07 10:16:20 +00:00
#include "jobdesc.h"
#include "desc.h"
#include "jr.h"
int blob_decap(u8 *key_mod, u8 *src, u8 *dst, u32 len)
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>
2014-10-07 10:16:20 +00:00
{
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_encap(u8 *key_mod, u8 *src, u8 *dst, u32 len)
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>
2014-10-07 10:16:20 +00:00
{
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;
}
#ifdef CONFIG_CMD_DEKBLOB
int blob_dek(const u8 *src, u8 *dst, u8 len)
{
int ret, size, i = 0;
u32 *desc;
int out_sz = WRP_HDR_SIZE + len + KEY_BLOB_SIZE + MAC_SIZE;
puts("\nEncapsulating provided DEK to form blob\n");
desc = memalign(ARCH_DMA_MINALIGN,
sizeof(uint32_t) * DEK_BLOB_DESCSIZE);
if (!desc) {
debug("Not enough memory for descriptor allocation\n");
return -ENOMEM;
}
ret = inline_cnstr_jobdesc_blob_dek(desc, src, dst, len);
if (ret) {
debug("Error in Job Descriptor Construction: %d\n", ret);
} else {
size = roundup(sizeof(uint32_t) * DEK_BLOB_DESCSIZE,
ARCH_DMA_MINALIGN);
flush_dcache_range((unsigned long)desc,
(unsigned long)desc + size);
size = roundup(sizeof(uint8_t) * out_sz, ARCH_DMA_MINALIGN);
flush_dcache_range((unsigned long)dst,
(unsigned long)dst + size);
ret = run_descriptor_jr(desc);
}
if (ret) {
debug("Error in Encapsulation %d\n", ret);
goto err;
}
size = roundup(out_sz, ARCH_DMA_MINALIGN);
invalidate_dcache_range((unsigned long)dst, (unsigned long)dst+size);
puts("DEK Blob\n");
for (i = 0; i < out_sz; i++)
printf("%02X", ((uint8_t *)dst)[i]);
printf("\n");
err:
free(desc);
return ret;
}
#endif