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/* SPDX-License-Identifier: BSD-2-Clause */
/*
* Copyright (c) 2015, Linaro Limited
* All rights reserved.
*/
#ifndef SIGNED_HDR_H
#define SIGNED_HDR_H
#include <inttypes.h>
#include <tee_api_types.h>
#include <stdlib.h>
enum shdr_img_type {
SHDR_TA = 0,
SHDR_BOOTSTRAP_TA = 1,
};
#define SHDR_MAGIC 0x4f545348
/**
* struct shdr - signed header
* @magic: magic number must match SHDR_MAGIC
* @img_type: image type, values defined by enum shdr_img_type
* @img_size: image size in bytes
* @algo: algorithm, defined by public key algorithms TEE_ALG_*
* from TEE Internal API specification
* @hash_size: size of the signed hash
* @sig_size: size of the signature
* @hash: hash of an image
* @sig: signature of @hash
*/
struct shdr {
uint32_t magic;
uint32_t img_type;
uint32_t img_size;
uint32_t algo;
uint16_t hash_size;
uint16_t sig_size;
/*
* Commented out element used to visualize the layout dynamic part
* of the struct.
*
* hash is accessed through the macro SHDR_GET_HASH and
* signature is accessed through the macro SHDR_GET_SIG
*
* uint8_t hash[hash_size];
* uint8_t sig[sig_size];
*/
};
#define SHDR_GET_SIZE(x) (sizeof(struct shdr) + (x)->hash_size + \
(x)->sig_size)
#define SHDR_GET_HASH(x) (uint8_t *)(((struct shdr *)(x)) + 1)
#define SHDR_GET_SIG(x) (SHDR_GET_HASH(x) + (x)->hash_size)
struct shdr_bootstrap_ta {
uint8_t uuid[sizeof(TEE_UUID)];
uint32_t version;
};
/*
* Allocates a struct shdr large enough to hold the entire header,
* excluding a subheader like struct shdr_bootstrap_ta.
*/
struct shdr *shdr_alloc_and_copy(const struct shdr *img, size_t img_size);
/* Frees a previously allocated struct shdr */
static inline void shdr_free(struct shdr *shdr)
{
free(shdr);
}
/*
* Verifies the signature in the @shdr.
*
* Note that the static part of struct shdr and payload still need to be
* checked against the hash contained in the header.
*
* Returns TEE_SUCCESS on success or TEE_ERROR_SECURITY on failure
*/
TEE_Result shdr_verify_signature(const struct shdr *shdr);
#endif /*SIGNED_HDR_H*/
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