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/*
* Copyright (c) 2015-2022, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <assert.h>
#include <stdint.h>
#include <string.h>
#include <common/debug.h>
#include <drivers/arm/cryptocell/cc_rotpk.h>
#include <drivers/delay_timer.h>
#include <lib/cassert.h>
#include <lib/fconf/fconf.h>
#include <plat/common/common_def.h>
#include <plat/common/platform.h>
#if defined(ARM_COT_cca)
#include <tools_share/cca_oid.h>
#elif defined(ARM_COT_dualroot)
#include <tools_share/dualroot_oid.h>
#elif defined(ARM_COT_tbbr)
#include <tools_share/tbbr_oid.h>
#endif
#include <plat/arm/common/fconf_nv_cntr_getter.h>
#include <plat/arm/common/plat_arm.h>
#include <platform_def.h>
#if !ARM_CRYPTOCELL_INTEG
#if !ARM_ROTPK_LOCATION_ID
#error "ARM_ROTPK_LOCATION_ID not defined"
#endif
#endif
#if COT_DESC_IN_DTB && defined(IMAGE_BL2)
uintptr_t nv_cntr_base_addr[MAX_NV_CTR_IDS];
#else
uintptr_t nv_cntr_base_addr[MAX_NV_CTR_IDS] = {
TFW_NVCTR_BASE,
NTFW_CTR_BASE
};
#endif
/* Weak definition may be overridden in specific platform */
#pragma weak plat_get_nv_ctr
#pragma weak plat_set_nv_ctr
extern unsigned char arm_rotpk_header[], arm_rotpk_hash_end[];
#if (ARM_ROTPK_LOCATION_ID == ARM_ROTPK_REGS_ID) || ARM_CRYPTOCELL_INTEG
static unsigned char rotpk_hash_der[ARM_ROTPK_HEADER_LEN + ARM_ROTPK_HASH_LEN];
#endif
#if (ARM_ROTPK_LOCATION_ID == ARM_ROTPK_REGS_ID)
/*
* Return the ROTPK hash stored in dedicated registers.
*/
int arm_get_rotpk_info_regs(void **key_ptr, unsigned int *key_len,
unsigned int *flags)
{
uint8_t *dst;
uint32_t *src, tmp;
unsigned int words, i;
assert(key_ptr != NULL);
assert(key_len != NULL);
assert(flags != NULL);
/* Copy the DER header */
memcpy(rotpk_hash_der, arm_rotpk_header, ARM_ROTPK_HEADER_LEN);
dst = (uint8_t *)&rotpk_hash_der[ARM_ROTPK_HEADER_LEN];
words = ARM_ROTPK_HASH_LEN >> 2;
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 & 0xFF);
*dst++ = (uint8_t)((tmp >> 8) & 0xFF);
*dst++ = (uint8_t)((tmp >> 16) & 0xFF);
*dst++ = (uint8_t)((tmp >> 24) & 0xFF);
}
*key_ptr = (void *)rotpk_hash_der;
*key_len = (unsigned int)sizeof(rotpk_hash_der);
*flags = ROTPK_IS_HASH;
return 0;
}
#endif
#if (ARM_ROTPK_LOCATION_ID == ARM_ROTPK_DEVEL_RSA_ID) || \
(ARM_ROTPK_LOCATION_ID == ARM_ROTPK_DEVEL_ECDSA_ID)
/*
* Return development ROTPK hash generated from ROT_KEY.
*/
int arm_get_rotpk_info_dev(void **key_ptr, unsigned int *key_len,
unsigned int *flags)
{
*key_ptr = arm_rotpk_header;
*key_len = arm_rotpk_hash_end - arm_rotpk_header;
*flags = ROTPK_IS_HASH;
return 0;
}
#endif
#if ARM_CRYPTOCELL_INTEG
/*
* Return ROTPK hash from CryptoCell.
*/
int arm_get_rotpk_info_cc(void **key_ptr, unsigned int *key_len,
unsigned int *flags)
{
unsigned char *dst;
assert(key_ptr != NULL);
assert(key_len != NULL);
assert(flags != NULL);
/* Copy the DER header */
memcpy(rotpk_hash_der, arm_rotpk_header, ARM_ROTPK_HEADER_LEN);
dst = &rotpk_hash_der[ARM_ROTPK_HEADER_LEN];
*key_ptr = rotpk_hash_der;
*key_len = sizeof(rotpk_hash_der);
return cc_get_rotpk_hash(dst, ARM_ROTPK_HASH_LEN, flags);
}
#endif
/*
* Wrapper function for most Arm platforms to get ROTPK hash.
*/
static int get_rotpk_info(void **key_ptr, unsigned int *key_len,
unsigned int *flags)
{
#if ARM_CRYPTOCELL_INTEG
return arm_get_rotpk_info_cc(key_ptr, key_len, flags);
#else
#if (ARM_ROTPK_LOCATION_ID == ARM_ROTPK_DEVEL_RSA_ID) || \
(ARM_ROTPK_LOCATION_ID == ARM_ROTPK_DEVEL_ECDSA_ID)
return arm_get_rotpk_info_dev(key_ptr, key_len, flags);
#elif (ARM_ROTPK_LOCATION_ID == ARM_ROTPK_REGS_ID)
return arm_get_rotpk_info_regs(key_ptr, key_len, flags);
#else
return 1;
#endif
#endif /* ARM_CRYPTOCELL_INTEG */
}
#if defined(ARM_COT_tbbr)
int arm_get_rotpk_info(void *cookie __unused, void **key_ptr,
unsigned int *key_len, unsigned int *flags)
{
return get_rotpk_info(key_ptr, key_len, flags);
}
#elif defined(ARM_COT_dualroot)
int arm_get_rotpk_info(void *cookie, void **key_ptr, unsigned int *key_len,
unsigned int *flags)
{
/*
* Return the right root of trust key hash based on the cookie value:
* - NULL means the primary ROTPK.
* - Otherwise, interpret cookie as the OID of the certificate
* extension containing the key.
*/
if (cookie == NULL) {
return get_rotpk_info(key_ptr, key_len, flags);
} else if (strcmp(cookie, PROT_PK_OID) == 0) {
extern unsigned char arm_protpk_hash[];
extern unsigned char arm_protpk_hash_end[];
*key_ptr = arm_protpk_hash;
*key_len = arm_protpk_hash_end - arm_protpk_hash;
*flags = ROTPK_IS_HASH;
return 0;
} else {
/* Invalid key ID. */
return 1;
}
}
#elif defined(ARM_COT_cca)
int arm_get_rotpk_info(void *cookie, void **key_ptr, unsigned int *key_len,
unsigned int *flags)
{
/*
* Return the right root of trust key hash based on the cookie value:
* - NULL means the primary ROTPK.
* - Otherwise, interpret cookie as the OID of the certificate
* extension containing the key.
*/
if (cookie == NULL) {
return get_rotpk_info(key_ptr, key_len, flags);
} else if (strcmp(cookie, PROT_PK_OID) == 0) {
extern unsigned char arm_protpk_hash[];
extern unsigned char arm_protpk_hash_end[];
*key_ptr = arm_protpk_hash;
*key_len = arm_protpk_hash_end - arm_protpk_hash;
*flags = ROTPK_IS_HASH;
return 0;
} else if (strcmp(cookie, SWD_ROT_PK_OID) == 0) {
extern unsigned char arm_swd_rotpk_hash[];
extern unsigned char arm_swd_rotpk_hash_end[];
*key_ptr = arm_swd_rotpk_hash;
*key_len = arm_swd_rotpk_hash_end - arm_swd_rotpk_hash;
*flags = ROTPK_IS_HASH;
return 0;
} else {
/* Invalid key ID. */
return 1;
}
}
#endif
/*
* Return the non-volatile counter value stored in the platform. The cookie
* will contain the OID of the counter in the certificate.
*
* Return: 0 = success, Otherwise = error
*/
int plat_get_nv_ctr(void *cookie, unsigned int *nv_ctr)
{
const char *oid;
uint32_t *nv_ctr_addr;
assert(cookie != NULL);
assert(nv_ctr != NULL);
oid = (const char *)cookie;
if (strcmp(oid, TRUSTED_FW_NVCOUNTER_OID) == 0) {
nv_ctr_addr = (uint32_t *)FCONF_GET_PROPERTY(cot, nv_cntr_addr,
TRUSTED_NV_CTR_ID);
} else if (strcmp(oid, NON_TRUSTED_FW_NVCOUNTER_OID) == 0) {
nv_ctr_addr = (uint32_t *)FCONF_GET_PROPERTY(cot, nv_cntr_addr,
NON_TRUSTED_NV_CTR_ID);
} else {
return 1;
}
*nv_ctr = (unsigned int)(*nv_ctr_addr);
return 0;
}
/*
* Store a new non-volatile counter value. By default on ARM development
* platforms, the non-volatile counters are RO and cannot be modified. We expect
* the values in the certificates to always match the RO values so that this
* function is never called.
*
* Return: 0 = success, Otherwise = error
*/
int plat_set_nv_ctr(void *cookie, unsigned int nv_ctr)
{
return 1;
}
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