common/image-sig.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (c) 2013, Google Inc.
 */

#ifdef USE_HOSTCC
#include "mkimage.h"
#include <fdt_support.h>
#include <time.h>
#include <linux/libfdt.h>
#else
#include <common.h>
#include <log.h>
#include <malloc.h>
#include <asm/global_data.h>
DECLARE_GLOBAL_DATA_PTR;
#endif /* !USE_HOSTCC*/
#include <image.h>
#include <u-boot/ecdsa.h>
#include <u-boot/rsa.h>
#include <u-boot/hash-checksum.h>

#define IMAGE_MAX_HASHED_NODES		100

struct checksum_algo checksum_algos[] = {
	{
		.name = "sha1",
		.checksum_len = SHA1_SUM_LEN,
		.der_len = SHA1_DER_LEN,
		.der_prefix = sha1_der_prefix,
#if IMAGE_ENABLE_SIGN
		.calculate_sign = EVP_sha1,
#endif
		.calculate = hash_calculate,
	},
	{
		.name = "sha256",
		.checksum_len = SHA256_SUM_LEN,
		.der_len = SHA256_DER_LEN,
		.der_prefix = sha256_der_prefix,
#if IMAGE_ENABLE_SIGN
		.calculate_sign = EVP_sha256,
#endif
		.calculate = hash_calculate,
	},
#ifdef CONFIG_SHA384
	{
		.name = "sha384",
		.checksum_len = SHA384_SUM_LEN,
		.der_len = SHA384_DER_LEN,
		.der_prefix = sha384_der_prefix,
#if IMAGE_ENABLE_SIGN
		.calculate_sign = EVP_sha384,
#endif
		.calculate = hash_calculate,
	},
#endif
#ifdef CONFIG_SHA512
	{
		.name = "sha512",
		.checksum_len = SHA512_SUM_LEN,
		.der_len = SHA512_DER_LEN,
		.der_prefix = sha512_der_prefix,
#if IMAGE_ENABLE_SIGN
		.calculate_sign = EVP_sha512,
#endif
		.calculate = hash_calculate,
	},
#endif

};

struct crypto_algo crypto_algos[] = {
	{
		.name = "rsa2048",
		.key_len = RSA2048_BYTES,
		.sign = rsa_sign,
		.add_verify_data = rsa_add_verify_data,
		.verify = rsa_verify,
	},
	{
		.name = "rsa4096",
		.key_len = RSA4096_BYTES,
		.sign = rsa_sign,
		.add_verify_data = rsa_add_verify_data,
		.verify = rsa_verify,
	},
	{
		.name = "ecdsa256",
		.key_len = ECDSA256_BYTES,
		.sign = ecdsa_sign,
		.add_verify_data = ecdsa_add_verify_data,
		.verify = ecdsa_verify,
	},
};

struct padding_algo padding_algos[] = {
	{
		.name = "pkcs-1.5",
		.verify = padding_pkcs_15_verify,
	},
#ifdef CONFIG_FIT_ENABLE_RSASSA_PSS_SUPPORT
	{
		.name = "pss",
		.verify = padding_pss_verify,
	}
#endif /* CONFIG_FIT_ENABLE_RSASSA_PSS_SUPPORT */
};

struct checksum_algo *image_get_checksum_algo(const char *full_name)
{
	int i;
	const char *name;

#if !defined(USE_HOSTCC) && defined(CONFIG_NEEDS_MANUAL_RELOC)
	static bool done;

	if (!done) {
		done = true;
		for (i = 0; i < ARRAY_SIZE(checksum_algos); i++) {
			checksum_algos[i].name += gd->reloc_off;
#if IMAGE_ENABLE_SIGN
			checksum_algos[i].calculate_sign += gd->reloc_off;
#endif
			checksum_algos[i].calculate += gd->reloc_off;
		}
	}
#endif

	for (i = 0; i < ARRAY_SIZE(checksum_algos); i++) {
		name = checksum_algos[i].name;
		/* Make sure names match and next char is a comma */
		if (!strncmp(name, full_name, strlen(name)) &&
		    full_name[strlen(name)] == ',')
			return &checksum_algos[i];
	}

	return NULL;
}

struct crypto_algo *image_get_crypto_algo(const char *full_name)
{
	int i;
	const char *name;

#if !defined(USE_HOSTCC) && defined(CONFIG_NEEDS_MANUAL_RELOC)
	static bool done;

	if (!done) {
		done = true;
		for (i = 0; i < ARRAY_SIZE(crypto_algos); i++) {
			crypto_algos[i].name += gd->reloc_off;
			crypto_algos[i].sign += gd->reloc_off;
			crypto_algos[i].add_verify_data += gd->reloc_off;
			crypto_algos[i].verify += gd->reloc_off;
		}
	}
#endif

	/* Move name to after the comma */
	name = strchr(full_name, ',');
	if (!name)
		return NULL;
	name += 1;

	for (i = 0; i < ARRAY_SIZE(crypto_algos); i++) {
		if (!strcmp(crypto_algos[i].name, name))
			return &crypto_algos[i];
	}

	return NULL;
}

struct padding_algo *image_get_padding_algo(const char *name)
{
	int i;

	if (!name)
		return NULL;

	for (i = 0; i < ARRAY_SIZE(padding_algos); i++) {
		if (!strcmp(padding_algos[i].name, name))
			return &padding_algos[i];
	}

	return NULL;
}