mirror of
https://github.com/ARM-software/arm-trusted-firmware.git
synced 2025-04-19 02:54:24 +00:00
95cfd4ad84
This patch extends the platform port by adding an API that returns
either the Root of Trust public key (ROTPK) or its hash. This is
usually stored in ROM or eFUSE memory. The ROTPK returned must be
encoded in DER format according to the following ASN.1 structure:
SubjectPublicKeyInfo ::= SEQUENCE {
algorithm AlgorithmIdentifier,
subjectPublicKey BIT STRING
}
In case the platform returns a hash of the key:
DigestInfo ::= SEQUENCE {
digestAlgorithm AlgorithmIdentifier,
keyDigest OCTET STRING
}
An implementation for ARM development platforms is provided in this
patch. When TBB is enabled, the ROTPK hash location must be specified
using the build option 'ARM_ROTPK_LOCATION'. Available options are:
- 'regs' : return the ROTPK hash stored in the Trusted
root-key storage registers.
- 'devel_rsa' : return a ROTPK hash embedded in the BL1 and
BL2 binaries. This hash has been obtained from the development
RSA public key located in 'plat/arm/board/common/rotpk'.
On FVP, the number of MMU tables has been increased to map and
access the ROTPK registers.
A new file 'board_common.mk' has been added to improve code sharing
in the ARM develelopment platforms.
Change-Id: Ib25862e5507d1438da10773e62bd338da8f360bf
161 lines
5.8 KiB
C
161 lines
5.8 KiB
C
/*
|
|
* Copyright (c) 2015, ARM Limited and Contributors. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are met:
|
|
*
|
|
* Redistributions of source code must retain the above copyright notice, this
|
|
* list of conditions and the following disclaimer.
|
|
*
|
|
* Redistributions in binary form must reproduce the above copyright notice,
|
|
* this list of conditions and the following disclaimer in the documentation
|
|
* and/or other materials provided with the distribution.
|
|
*
|
|
* Neither the name of ARM nor the names of its contributors may be used
|
|
* to endorse or promote products derived from this software without specific
|
|
* prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
|
|
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <arm_def.h>
|
|
#include <assert.h>
|
|
#include <platform.h>
|
|
#include <stdint.h>
|
|
#include <string.h>
|
|
|
|
/* Weak definition may be overridden in specific platform */
|
|
#pragma weak plat_match_rotpk
|
|
|
|
/* SHA256 algorithm */
|
|
#define SHA256_BYTES 32
|
|
|
|
/* ROTPK locations */
|
|
#define ARM_ROTPK_REGS_ID 1
|
|
#define ARM_ROTPK_DEVEL_RSA_ID 2
|
|
|
|
#if !ARM_ROTPK_LOCATION_ID
|
|
#error "ARM_ROTPK_LOCATION_ID not defined"
|
|
#endif
|
|
|
|
static const unsigned char rotpk_hash_hdr[] = \
|
|
"\x30\x31\x30\x0D\x06\x09\x60\x86\x48" \
|
|
"\x01\x65\x03\x04\x02\x01\x05\x00\x04\x20";
|
|
static const unsigned int rotpk_hash_hdr_len = sizeof(rotpk_hash_hdr) - 1;
|
|
static unsigned char rotpk_hash_der[sizeof(rotpk_hash_hdr) - 1 + SHA256_BYTES];
|
|
|
|
#if (ARM_ROTPK_LOCATION_ID == ARM_ROTPK_DEVEL_RSA_ID)
|
|
static const unsigned char arm_devel_rotpk_hash[] = \
|
|
"\xB0\xF3\x82\x09\x12\x97\xD8\x3A" \
|
|
"\x37\x7A\x72\x47\x1B\xEC\x32\x73" \
|
|
"\xE9\x92\x32\xE2\x49\x59\xF6\x5E" \
|
|
"\x8B\x4A\x4A\x46\xD8\x22\x9A\xDA";
|
|
#endif
|
|
|
|
/*
|
|
* Check the validity of the key
|
|
*
|
|
* 0 = success, Otherwise = error
|
|
*/
|
|
int plat_match_rotpk(const unsigned char *key_buf, unsigned int key_len)
|
|
{
|
|
/* TODO: check against the ROT key stored in the platform */
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Return the ROTPK hash in the following ASN.1 structure in DER format:
|
|
*
|
|
* AlgorithmIdentifier ::= SEQUENCE {
|
|
* algorithm OBJECT IDENTIFIER,
|
|
* parameters ANY DEFINED BY algorithm OPTIONAL
|
|
* }
|
|
*
|
|
* DigestInfo ::= SEQUENCE {
|
|
* digestAlgorithm AlgorithmIdentifier,
|
|
* digest OCTET STRING
|
|
* }
|
|
*/
|
|
int plat_get_rotpk_info(void *cookie, void **key_ptr, unsigned int *key_len,
|
|
unsigned int *flags)
|
|
{
|
|
uint8_t *dst;
|
|
|
|
assert(key_ptr != NULL);
|
|
assert(key_len != NULL);
|
|
assert(flags != NULL);
|
|
|
|
/* Copy the DER header */
|
|
memcpy(rotpk_hash_der, rotpk_hash_hdr, rotpk_hash_hdr_len);
|
|
dst = (uint8_t *)&rotpk_hash_der[rotpk_hash_hdr_len];
|
|
|
|
#if (ARM_ROTPK_LOCATION_ID == ARM_ROTPK_DEVEL_RSA_ID)
|
|
memcpy(dst, arm_devel_rotpk_hash, SHA256_BYTES);
|
|
#elif (ARM_ROTPK_LOCATION_ID == ARM_ROTPK_REGS_ID)
|
|
uint32_t *src, tmp;
|
|
unsigned int words, i;
|
|
|
|
/*
|
|
* Append the hash from Trusted Root-Key Storage registers. The hash has
|
|
* not been written linearly into the registers, so we have to do a bit
|
|
* of byte swapping:
|
|
*
|
|
* 0x00 0x04 0x08 0x0C 0x10 0x14 0x18 0x1C
|
|
* +---------------------------------------------------------------+
|
|
* | Reg0 | Reg1 | Reg2 | Reg3 | Reg4 | Reg5 | Reg6 | Reg7 |
|
|
* +---------------------------------------------------------------+
|
|
* | ... ... | | ... ... |
|
|
* | +--------------------+ | +-------+
|
|
* | | | |
|
|
* +----------------------------+ +----------------------------+
|
|
* | | | |
|
|
* +-------+ | +--------------------+ |
|
|
* | | | |
|
|
* v v v v
|
|
* +---------------------------------------------------------------+
|
|
* | | |
|
|
* +---------------------------------------------------------------+
|
|
* 0 15 16 31
|
|
*
|
|
* Additionally, we have to access the registers in 32-bit words
|
|
*/
|
|
words = SHA256_BYTES >> 3;
|
|
|
|
/* Swap bytes 0-15 (first four registers) */
|
|
src = (uint32_t *)TZ_PUB_KEY_HASH_BASE;
|
|
for (i = 0 ; i < words ; i++) {
|
|
tmp = src[words - 1 - i];
|
|
/* Words are read in little endian */
|
|
*dst++ = (uint8_t)((tmp >> 24) & 0xFF);
|
|
*dst++ = (uint8_t)((tmp >> 16) & 0xFF);
|
|
*dst++ = (uint8_t)((tmp >> 8) & 0xFF);
|
|
*dst++ = (uint8_t)(tmp & 0xFF);
|
|
}
|
|
|
|
/* Swap bytes 16-31 (last four registers) */
|
|
src = (uint32_t *)(TZ_PUB_KEY_HASH_BASE + SHA256_BYTES / 2);
|
|
for (i = 0 ; i < words ; i++) {
|
|
tmp = src[words - 1 - i];
|
|
*dst++ = (uint8_t)((tmp >> 24) & 0xFF);
|
|
*dst++ = (uint8_t)((tmp >> 16) & 0xFF);
|
|
*dst++ = (uint8_t)((tmp >> 8) & 0xFF);
|
|
*dst++ = (uint8_t)(tmp & 0xFF);
|
|
}
|
|
#endif /* (ARM_ROTPK_LOCATION_ID == ARM_ROTPK_DEVEL_RSA_ID) */
|
|
|
|
*key_ptr = (void *)rotpk_hash_der;
|
|
*key_len = (unsigned int)sizeof(rotpk_hash_der);
|
|
*flags = ROTPK_IS_HASH;
|
|
return 0;
|
|
}
|
|
|