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/*
* Copyright (c) 2015-2018, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <assert.h>
#include <errno.h>
#include <limits.h>
#include <stdint.h>
#include <string.h>
#include <common/debug.h>
#include <drivers/auth/auth_common.h>
#include <drivers/auth/img_parser_mod.h>
#include <lib/utils_def.h>
IMPORT_SYM(uintptr_t, __PARSER_LIB_DESCS_START__, PARSER_LIB_DESCS_START);
IMPORT_SYM(uintptr_t, __PARSER_LIB_DESCS_END__, PARSER_LIB_DESCS_END);
static unsigned int parser_lib_indices[IMG_MAX_TYPES];
static img_parser_lib_desc_t *parser_lib_descs;
#define INVALID_IDX UINT_MAX
static void validate_desc(img_parser_lib_desc_t *desc)
{
assert(desc != NULL);
assert(desc->init != NULL);
assert(desc->name != NULL);
assert(desc->check_integrity != NULL);
assert(desc->get_auth_param != NULL);
}
void img_parser_init(void)
{
unsigned int index, mod_num;
/* Initialise internal variables to invalid state */
for (index = 0; index < IMG_MAX_TYPES; index++) {
parser_lib_indices[index] = INVALID_IDX;
}
/* Calculate how many image parsers are registered. At least one parser
* must be present */
mod_num = PARSER_LIB_DESCS_END - PARSER_LIB_DESCS_START;
mod_num /= sizeof(img_parser_lib_desc_t);
assert(mod_num > 0);
parser_lib_descs = (img_parser_lib_desc_t *) PARSER_LIB_DESCS_START;
for (index = 0; index < mod_num; index++) {
/* Check that the image parser library descriptor is valid */
validate_desc(&parser_lib_descs[index]);
/* Initialize image parser */
parser_lib_descs[index].init();
/* Ensure only one parser is registered for each image type */
assert(parser_lib_indices[parser_lib_descs[index].img_type] ==
INVALID_IDX);
/* Keep the index of this hash calculator */
parser_lib_indices[parser_lib_descs[index].img_type] = index;
}
}
int img_parser_check_integrity(img_type_t img_type,
void *img_ptr, unsigned int img_len)
{
unsigned int idx;
assert(img_ptr != NULL);
assert(img_len != 0);
/* No integrity checks on raw images */
if (img_type == IMG_RAW) {
return IMG_PARSER_OK;
}
/* Find the index of the required image parser */
idx = parser_lib_indices[img_type];
assert(idx != INVALID_IDX);
/* Call the function to check the image integrity */
return parser_lib_descs[idx].check_integrity(img_ptr, img_len);
}
/*
* Extract an authentication parameter from an image
*
* Parameters:
* img_type: image type (certificate, raw image, etc)
* type_desc: provides info to obtain the parameter
* img_ptr: pointer to image data
* img_len: image length
* param_ptr: [out] stores a pointer to the parameter
* param_len: [out] stores the length of the parameter
*/
int img_parser_get_auth_param(img_type_t img_type,
const auth_param_type_desc_t *type_desc,
void *img_ptr, unsigned int img_len,
void **param_ptr, unsigned int *param_len)
{
unsigned int idx;
assert(type_desc != NULL);
assert(img_ptr != NULL);
assert(img_len != 0);
assert(param_ptr != NULL);
assert(param_len != NULL);
/* In a raw image we can only get the data itself */
if (img_type == IMG_RAW) {
assert(type_desc->type == AUTH_PARAM_RAW_DATA);
*param_ptr = img_ptr;
*param_len = img_len;
return IMG_PARSER_OK;
}
/* Find the index of the required image parser library */
idx = parser_lib_indices[img_type];
assert(idx != INVALID_IDX);
/* Call the function to obtain the parameter */
return parser_lib_descs[idx].get_auth_param(type_desc, img_ptr, img_len,
param_ptr, param_len);
}