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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>
30 lines
735 B
C
30 lines
735 B
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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#ifndef __JOBDESC_H
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#define __JOBDESC_H
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#include <common.h>
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#include <asm/io.h>
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#define KEY_IDNFR_SZ_BYTES 16
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void inline_cnstr_jobdesc_hash(uint32_t *desc,
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const uint8_t *msg, uint32_t msgsz, uint8_t *digest,
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u32 alg_type, uint32_t alg_size, int sg_tbl);
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void inline_cnstr_jobdesc_blob_encap(uint32_t *desc, uint8_t *key_idnfr,
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uint8_t *plain_txt, uint8_t *enc_blob,
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uint32_t in_sz);
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void inline_cnstr_jobdesc_blob_decap(uint32_t *desc, uint8_t *key_idnfr,
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uint8_t *enc_blob, uint8_t *plain_txt,
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uint32_t out_sz);
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void inline_cnstr_jobdesc_rng_instantiation(uint32_t *desc);
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#endif
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