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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>
125 lines
3.4 KiB
C
125 lines
3.4 KiB
C
/*
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* SEC Descriptor Construction Library
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* Basic job descriptor construction
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*
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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 "desc_constr.h"
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#include "jobdesc.h"
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#define KEY_BLOB_SIZE 32
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#define MAC_SIZE 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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{
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/* SHA 256 , output is of length 32 words */
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uint32_t storelen = alg_size;
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u32 options;
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dma_addr_t dma_addr_in, dma_addr_out;
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dma_addr_in = virt_to_phys((void *)msg);
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dma_addr_out = virt_to_phys((void *)digest);
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init_job_desc(desc, 0);
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append_operation(desc, OP_TYPE_CLASS2_ALG |
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OP_ALG_AAI_HASH | OP_ALG_AS_INITFINAL |
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OP_ALG_ENCRYPT | OP_ALG_ICV_OFF | alg_type);
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options = LDST_CLASS_2_CCB | FIFOLD_TYPE_MSG | FIFOLD_TYPE_LAST2;
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if (sg_tbl)
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options |= FIFOLDST_SGF;
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if (msgsz > 0xffff) {
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options |= FIFOLDST_EXT;
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append_fifo_load(desc, dma_addr_in, 0, options);
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append_cmd(desc, msgsz);
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} else {
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append_fifo_load(desc, dma_addr_in, msgsz, options);
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}
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append_store(desc, dma_addr_out, storelen,
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LDST_CLASS_2_CCB | LDST_SRCDST_BYTE_CONTEXT);
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}
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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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{
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dma_addr_t dma_addr_key_idnfr, dma_addr_in, dma_addr_out;
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uint32_t key_sz = KEY_IDNFR_SZ_BYTES;
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/* output blob will have 32 bytes key blob in beginning and
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* 16 byte HMAC identifier at end of data blob */
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uint32_t out_sz = in_sz + KEY_BLOB_SIZE + MAC_SIZE;
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dma_addr_key_idnfr = virt_to_phys((void *)key_idnfr);
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dma_addr_in = virt_to_phys((void *)plain_txt);
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dma_addr_out = virt_to_phys((void *)enc_blob);
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init_job_desc(desc, 0);
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append_key(desc, dma_addr_key_idnfr, key_sz, CLASS_2);
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append_seq_in_ptr(desc, dma_addr_in, in_sz, 0);
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append_seq_out_ptr(desc, dma_addr_out, out_sz, 0);
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append_operation(desc, OP_TYPE_ENCAP_PROTOCOL | OP_PCLID_BLOB);
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}
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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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{
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dma_addr_t dma_addr_key_idnfr, dma_addr_in, dma_addr_out;
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uint32_t key_sz = KEY_IDNFR_SZ_BYTES;
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uint32_t in_sz = out_sz + KEY_BLOB_SIZE + MAC_SIZE;
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dma_addr_key_idnfr = virt_to_phys((void *)key_idnfr);
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dma_addr_in = virt_to_phys((void *)enc_blob);
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dma_addr_out = virt_to_phys((void *)plain_txt);
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init_job_desc(desc, 0);
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append_key(desc, dma_addr_key_idnfr, key_sz, CLASS_2);
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append_seq_in_ptr(desc, dma_addr_in, in_sz, 0);
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append_seq_out_ptr(desc, dma_addr_out, out_sz, 0);
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append_operation(desc, OP_TYPE_DECAP_PROTOCOL | OP_PCLID_BLOB);
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}
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/*
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* Descriptor to instantiate RNG State Handle 0 in normal mode and
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* load the JDKEK, TDKEK and TDSK registers
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*/
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void inline_cnstr_jobdesc_rng_instantiation(uint32_t *desc)
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{
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u32 *jump_cmd;
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init_job_desc(desc, 0);
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/* INIT RNG in non-test mode */
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append_operation(desc, OP_TYPE_CLASS1_ALG | OP_ALG_ALGSEL_RNG |
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OP_ALG_AS_INIT);
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/* wait for done */
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jump_cmd = append_jump(desc, JUMP_CLASS_CLASS1);
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set_jump_tgt_here(desc, jump_cmd);
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/*
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* load 1 to clear written reg:
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* resets the done interrrupt and returns the RNG to idle.
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*/
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append_load_imm_u32(desc, 1, LDST_SRCDST_WORD_CLRW);
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/* generate secure keys (non-test) */
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append_operation(desc, OP_TYPE_CLASS1_ALG | OP_ALG_ALGSEL_RNG |
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OP_ALG_RNG4_SK);
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}
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