[J-u-boot.git] / common / image-sig.c

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

#ifdef USE_HOSTCC
#include "mkimage.h"
#include <time.h>
#else
#include <common.h>
#include <malloc.h>
DECLARE_GLOBAL_DATA_PTR;
#endif /* !USE_HOSTCC*/
#include <image.h>
#include <u-boot/rsa.h>
#include <u-boot/rsa-checksum.h>

#define IMAGE_MAX_HASHED_NODES		100

#ifdef USE_HOSTCC
void *host_blob;
void image_set_host_blob(void *blob)
{
	host_blob = blob;
}
void *image_get_host_blob(void)
{
	return host_blob;
}
#endif

struct checksum_algo checksum_algos[] = {
	{
		"sha1",
		SHA1_SUM_LEN,
		RSA2048_BYTES,
#if IMAGE_ENABLE_SIGN
		EVP_sha1,
#endif
		hash_calculate,
		padding_sha1_rsa2048,
	},
	{
		"sha256",
		SHA256_SUM_LEN,
		RSA2048_BYTES,
#if IMAGE_ENABLE_SIGN
		EVP_sha256,
#endif
		hash_calculate,
		padding_sha256_rsa2048,
	},
	{
		"sha256",
		SHA256_SUM_LEN,
		RSA4096_BYTES,
#if IMAGE_ENABLE_SIGN
		EVP_sha256,
#endif
		hash_calculate,
		padding_sha256_rsa4096,
	}

};

struct image_sig_algo image_sig_algos[] = {
	{
		"sha1,rsa2048",
		rsa_sign,
		rsa_add_verify_data,
		rsa_verify,
		&checksum_algos[0],
	},
	{
		"sha256,rsa2048",
		rsa_sign,
		rsa_add_verify_data,
		rsa_verify,
		&checksum_algos[1],
	},
	{
		"sha256,rsa4096",
		rsa_sign,
		rsa_add_verify_data,
		rsa_verify,
		&checksum_algos[2],
	}

};

struct image_sig_algo *image_get_sig_algo(const char *name)
{
	int i;

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

	return NULL;
}

/**
 * fit_region_make_list() - Make a list of image regions
 *
 * Given a list of fdt_regions, create a list of image_regions. This is a
 * simple conversion routine since the FDT and image code use different
 * structures.
 *
 * @fit: FIT image
 * @fdt_regions: Pointer to FDT regions
 * @count: Number of FDT regions
 * @region: Pointer to image regions, which must hold @count records. If
 * region is NULL, then (except for an SPL build) the array will be
 * allocated.
 * @return: Pointer to image regions
 */
struct image_region *fit_region_make_list(const void *fit,
		struct fdt_region *fdt_regions, int count,
		struct image_region *region)
{
	int i;

	debug("Hash regions:\n");
	debug("%10s %10s\n", "Offset", "Size");

	/*
	 * Use malloc() except in SPL (to save code size). In SPL the caller
	 * must allocate the array.
	 */
#ifndef CONFIG_SPL_BUILD
	if (!region)
		region = calloc(sizeof(*region), count);
#endif
	if (!region)
		return NULL;
	for (i = 0; i < count; i++) {
		debug("%10x %10x\n", fdt_regions[i].offset,
		      fdt_regions[i].size);
		region[i].data = fit + fdt_regions[i].offset;
		region[i].size = fdt_regions[i].size;
	}

	return region;
}

static int fit_image_setup_verify(struct image_sign_info *info,
		const void *fit, int noffset, int required_keynode,
		char **err_msgp)
{
	char *algo_name;

	if (fit_image_hash_get_algo(fit, noffset, &algo_name)) {
		*err_msgp = "Can't get hash algo property";
		return -1;
	}
	memset(info, '\0', sizeof(*info));
	info->keyname = fdt_getprop(fit, noffset, "key-name-hint", NULL);
	info->fit = (void *)fit;
	info->node_offset = noffset;
	info->algo = image_get_sig_algo(algo_name);
	info->fdt_blob = gd_fdt_blob();
	info->required_keynode = required_keynode;
	printf("%s:%s", algo_name, info->keyname);

	if (!info->algo) {
		*err_msgp = "Unknown signature algorithm";
		return -1;
	}

	return 0;
}

int fit_image_check_sig(const void *fit, int noffset, const void *data,
		size_t size, int required_keynode, char **err_msgp)
{
	struct image_sign_info info;
	struct image_region region;
	uint8_t *fit_value;
	int fit_value_len;

	*err_msgp = NULL;
	if (fit_image_setup_verify(&info, fit, noffset, required_keynode,
				   err_msgp))
		return -1;

	if (fit_image_hash_get_value(fit, noffset, &fit_value,
				     &fit_value_len)) {
		*err_msgp = "Can't get hash value property";
		return -1;
	}

	region.data = data;
	region.size = size;

	if (info.algo->verify(&info, &region, 1, fit_value, fit_value_len)) {
		*err_msgp = "Verification failed";
		return -1;
	}

	return 0;
}

static int fit_image_verify_sig(const void *fit, int image_noffset,
		const char *data, size_t size, const void *sig_blob,
		int sig_offset)
{
	int noffset;
	char *err_msg = "";
	int verified = 0;
	int ret;

	/* Process all hash subnodes of the component image node */
	fdt_for_each_subnode(fit, noffset, image_noffset) {
		const char *name = fit_get_name(fit, noffset, NULL);

		if (!strncmp(name, FIT_SIG_NODENAME,
			     strlen(FIT_SIG_NODENAME))) {
			ret = fit_image_check_sig(fit, noffset, data,
							size, -1, &err_msg);
			if (ret) {
				puts("- ");
			} else {
				puts("+ ");
				verified = 1;
				break;
			}
		}
	}

	if (noffset == -FDT_ERR_TRUNCATED || noffset == -FDT_ERR_BADSTRUCTURE) {
		err_msg = "Corrupted or truncated tree";
		goto error;
	}

	return verified ? 0 : -EPERM;

error:
	printf(" error!\n%s for '%s' hash node in '%s' image node\n",
	       err_msg, fit_get_name(fit, noffset, NULL),
	       fit_get_name(fit, image_noffset, NULL));
	return -1;
}

int fit_image_verify_required_sigs(const void *fit, int image_noffset,
		const char *data, size_t size, const void *sig_blob,
		int *no_sigsp)
{
	int verify_count = 0;
	int noffset;
	int sig_node;

	/* Work out what we need to verify */
	*no_sigsp = 1;
	sig_node = fdt_subnode_offset(sig_blob, 0, FIT_SIG_NODENAME);
	if (sig_node < 0) {
		debug("%s: No signature node found: %s\n", __func__,
		      fdt_strerror(sig_node));
		return 0;
	}

	fdt_for_each_subnode(sig_blob, noffset, sig_node) {
		const char *required;
		int ret;

		required = fdt_getprop(sig_blob, noffset, "required", NULL);
		if (!required || strcmp(required, "image"))
			continue;
		ret = fit_image_verify_sig(fit, image_noffset, data, size,
					sig_blob, noffset);
		if (ret) {
			printf("Failed to verify required signature '%s'\n",
			       fit_get_name(sig_blob, noffset, NULL));
			return ret;
		}
		verify_count++;
	}

	if (verify_count)
		*no_sigsp = 0;

	return 0;
}

int fit_config_check_sig(const void *fit, int noffset, int required_keynode,
			 char **err_msgp)
{
	char * const exc_prop[] = {"data"};
	const char *prop, *end, *name;
	struct image_sign_info info;
	const uint32_t *strings;
	uint8_t *fit_value;
	int fit_value_len;
	int max_regions;
	int i, prop_len;
	char path[200];
	int count;

	debug("%s: fdt=%p, conf='%s', sig='%s'\n", __func__, gd_fdt_blob(),
	      fit_get_name(fit, noffset, NULL),
	      fit_get_name(gd_fdt_blob(), required_keynode, NULL));
	*err_msgp = NULL;
	if (fit_image_setup_verify(&info, fit, noffset, required_keynode,
				   err_msgp))
		return -1;

	if (fit_image_hash_get_value(fit, noffset, &fit_value,
				     &fit_value_len)) {
		*err_msgp = "Can't get hash value property";
		return -1;
	}

	/* Count the number of strings in the property */
	prop = fdt_getprop(fit, noffset, "hashed-nodes", &prop_len);
	end = prop ? prop + prop_len : prop;
	for (name = prop, count = 0; name < end; name++)
		if (!*name)
			count++;
	if (!count) {
		*err_msgp = "Can't get hashed-nodes property";
		return -1;
	}

	/* Add a sanity check here since we are using the stack */
	if (count > IMAGE_MAX_HASHED_NODES) {
		*err_msgp = "Number of hashed nodes exceeds maximum";
		return -1;
	}

	/* Create a list of node names from those strings */
	char *node_inc[count];

	debug("Hash nodes (%d):\n", count);
	for (name = prop, i = 0; name < end; name += strlen(name) + 1, i++) {
		debug("   '%s'\n", name);
		node_inc[i] = (char *)name;
	}

	/*
	 * Each node can generate one region for each sub-node. Allow for
	 * 7 sub-nodes (hash@1, signature@1, etc.) and some extra.
	 */
	max_regions = 20 + count * 7;
	struct fdt_region fdt_regions[max_regions];

	/* Get a list of regions to hash */
	count = fdt_find_regions(fit, node_inc, count,
			exc_prop, ARRAY_SIZE(exc_prop),
			fdt_regions, max_regions - 1,
			path, sizeof(path), 0);
	if (count < 0) {
		*err_msgp = "Failed to hash configuration";
		return -1;
	}
	if (count == 0) {
		*err_msgp = "No data to hash";
		return -1;
	}
	if (count >= max_regions - 1) {
		*err_msgp = "Too many hash regions";
		return -1;
	}

	/* Add the strings */
	strings = fdt_getprop(fit, noffset, "hashed-strings", NULL);
	if (strings) {
		fdt_regions[count].offset = fdt_off_dt_strings(fit) +
				fdt32_to_cpu(strings[0]);
		fdt_regions[count].size = fdt32_to_cpu(strings[1]);
		count++;
	}

	/* Allocate the region list on the stack */
	struct image_region region[count];

	fit_region_make_list(fit, fdt_regions, count, region);
	if (info.algo->verify(&info, region, count, fit_value,
			      fit_value_len)) {
		*err_msgp = "Verification failed";
		return -1;
	}

	return 0;
}

static int fit_config_verify_sig(const void *fit, int conf_noffset,
		const void *sig_blob, int sig_offset)
{
	int noffset;
	char *err_msg = "";
	int verified = 0;
	int ret;

	/* Process all hash subnodes of the component conf node */
	fdt_for_each_subnode(fit, noffset, conf_noffset) {
		const char *name = fit_get_name(fit, noffset, NULL);

		if (!strncmp(name, FIT_SIG_NODENAME,
			     strlen(FIT_SIG_NODENAME))) {
			ret = fit_config_check_sig(fit, noffset, sig_offset,
						   &err_msg);
			if (ret) {
				puts("- ");
			} else {
				puts("+ ");
				verified = 1;
				break;
			}
		}
	}

	if (noffset == -FDT_ERR_TRUNCATED || noffset == -FDT_ERR_BADSTRUCTURE) {
		err_msg = "Corrupted or truncated tree";
		goto error;
	}

	return verified ? 0 : -EPERM;

error:
	printf(" error!\n%s for '%s' hash node in '%s' config node\n",
	       err_msg, fit_get_name(fit, noffset, NULL),
	       fit_get_name(fit, conf_noffset, NULL));
	return -1;
}

int fit_config_verify_required_sigs(const void *fit, int conf_noffset,
		const void *sig_blob)
{
	int noffset;
	int sig_node;

	/* Work out what we need to verify */
	sig_node = fdt_subnode_offset(sig_blob, 0, FIT_SIG_NODENAME);
	if (sig_node < 0) {
		debug("%s: No signature node found: %s\n", __func__,
		      fdt_strerror(sig_node));
		return 0;
	}

	fdt_for_each_subnode(sig_blob, noffset, sig_node) {
		const char *required;
		int ret;

		required = fdt_getprop(sig_blob, noffset, "required", NULL);
		if (!required || strcmp(required, "conf"))
			continue;
		ret = fit_config_verify_sig(fit, conf_noffset, sig_blob,
					    noffset);
		if (ret) {
			printf("Failed to verify required signature '%s'\n",
			       fit_get_name(sig_blob, noffset, NULL));
			return ret;
		}
	}

	return 0;
}

int fit_config_verify(const void *fit, int conf_noffset)
{
	return fit_config_verify_required_sigs(fit, conf_noffset,
					       gd_fdt_blob());
}
Commit	Line	Data
3e569a6b SG	1	/*
	2	* Copyright (c) 2013, Google Inc.
	3	*
1a459660	4	* SPDX-License-Identifier: GPL-2.0+
3e569a6b SG	5	*/
	6
	7	#ifdef USE_HOSTCC
	8	#include "mkimage.h"
	9	#include <time.h>
	10	#else
	11	#include <common.h>
56518e71 SG	12	#include <malloc.h>
56518e71 SG	13	DECLARE_GLOBAL_DATA_PTR;
3e569a6b	14	#endif /* !USE_HOSTCC*/
3e569a6b	15	#include <image.h>
2b9912e6 JH	16	#include <u-boot/rsa.h>
2b9912e6 JH	17	#include <u-boot/rsa-checksum.h>
3e569a6b	18
4d098529 SG	19	#define IMAGE_MAX_HASHED_NODES 100
4d098529 SG	20
646257d1	21	#ifdef USE_HOSTCC
29a23f9d HS	22	void *host_blob;
29a23f9d HS	23	void image_set_host_blob(void *blob)
646257d1	24	{
29a23f9d HS	25	host_blob = blob;
	26	}
	27	void *image_get_host_blob(void)
	28	{
	29	return host_blob;
646257d1 HS	30	}
	31	#endif
	32
	33	struct checksum_algo checksum_algos[] = {
	34	{
	35	"sha1",
	36	SHA1_SUM_LEN,
db1b5f3d	37	RSA2048_BYTES,
646257d1 HS	38	#if IMAGE_ENABLE_SIGN
646257d1 HS	39	EVP_sha1,
29a23f9d	40	#endif
b37b46f0	41	hash_calculate,
646257d1	42	padding_sha1_rsa2048,
646257d1 HS	43	},
	44	{
	45	"sha256",
	46	SHA256_SUM_LEN,
db1b5f3d	47	RSA2048_BYTES,
646257d1 HS	48	#if IMAGE_ENABLE_SIGN
646257d1 HS	49	EVP_sha256,
29a23f9d	50	#endif
b37b46f0	51	hash_calculate,
646257d1	52	padding_sha256_rsa2048,
db1b5f3d HS	53	},
	54	{
	55	"sha256",
	56	SHA256_SUM_LEN,
	57	RSA4096_BYTES,
	58	#if IMAGE_ENABLE_SIGN
	59	EVP_sha256,
29a23f9d	60	#endif
b37b46f0	61	hash_calculate,
db1b5f3d	62	padding_sha256_rsa4096,
646257d1	63	}
db1b5f3d	64
646257d1	65	};
db1b5f3d	66
3e569a6b	67	struct image_sig_algo image_sig_algos[] = {
19c402af SG	68	{
	69	"sha1,rsa2048",
	70	rsa_sign,
	71	rsa_add_verify_data,
	72	rsa_verify,
646257d1 HS	73	&checksum_algos[0],
	74	},
	75	{
	76	"sha256,rsa2048",
	77	rsa_sign,
	78	rsa_add_verify_data,
	79	rsa_verify,
	80	&checksum_algos[1],
db1b5f3d HS	81	},
	82	{
	83	"sha256,rsa4096",
	84	rsa_sign,
	85	rsa_add_verify_data,
	86	rsa_verify,
	87	&checksum_algos[2],
19c402af	88	}
db1b5f3d	89
3e569a6b SG	90	};
	91
	92	struct image_sig_algo image_get_sig_algo(const char name)
	93	{
	94	int i;
	95
	96	for (i = 0; i < ARRAY_SIZE(image_sig_algos); i++) {
	97	if (!strcmp(image_sig_algos[i].name, name))
	98	return &image_sig_algos[i];
	99	}
	100
	101	return NULL;
	102	}
56518e71	103
4d098529 SG	104	/**
	105	* fit_region_make_list() - Make a list of image regions
	106	*
	107	* Given a list of fdt_regions, create a list of image_regions. This is a
	108	* simple conversion routine since the FDT and image code use different
	109	* structures.
	110	*
	111	* @fit: FIT image
	112	* @fdt_regions: Pointer to FDT regions
	113	* @count: Number of FDT regions
	114	* @region: Pointer to image regions, which must hold @count records. If
	115	* region is NULL, then (except for an SPL build) the array will be
	116	* allocated.
	117	* @return: Pointer to image regions
	118	*/
	119	struct image_region fit_region_make_list(const void fit,
	120	struct fdt_region *fdt_regions, int count,
	121	struct image_region *region)
	122	{
	123	int i;
	124
	125	debug("Hash regions:\n");
	126	debug("%10s %10s\n", "Offset", "Size");
	127
	128	/*
	129	* Use malloc() except in SPL (to save code size). In SPL the caller
	130	* must allocate the array.
	131	*/
	132	#ifndef CONFIG_SPL_BUILD
	133	if (!region)
	134	region = calloc(sizeof(*region), count);
	135	#endif
	136	if (!region)
	137	return NULL;
	138	for (i = 0; i < count; i++) {
	139	debug("%10x %10x\n", fdt_regions[i].offset,
	140	fdt_regions[i].size);
	141	region[i].data = fit + fdt_regions[i].offset;
	142	region[i].size = fdt_regions[i].size;
	143	}
	144
	145	return region;
	146	}
	147
56518e71 SG	148	static int fit_image_setup_verify(struct image_sign_info *info,
	149	const void *fit, int noffset, int required_keynode,
	150	char **err_msgp)
	151	{
	152	char *algo_name;
	153
	154	if (fit_image_hash_get_algo(fit, noffset, &algo_name)) {
	155	*err_msgp = "Can't get hash algo property";
	156	return -1;
	157	}
	158	memset(info, '\0', sizeof(*info));
	159	info->keyname = fdt_getprop(fit, noffset, "key-name-hint", NULL);
	160	info->fit = (void *)fit;
	161	info->node_offset = noffset;
	162	info->algo = image_get_sig_algo(algo_name);
	163	info->fdt_blob = gd_fdt_blob();
	164	info->required_keynode = required_keynode;
	165	printf("%s:%s", algo_name, info->keyname);
	166
	167	if (!info->algo) {
	168	*err_msgp = "Unknown signature algorithm";
	169	return -1;
	170	}
	171
	172	return 0;
	173	}
	174
	175	int fit_image_check_sig(const void fit, int noffset, const void data,
	176	size_t size, int required_keynode, char **err_msgp)
	177	{
	178	struct image_sign_info info;
	179	struct image_region region;
	180	uint8_t *fit_value;
	181	int fit_value_len;
	182
	183	*err_msgp = NULL;
	184	if (fit_image_setup_verify(&info, fit, noffset, required_keynode,
	185	err_msgp))
	186	return -1;
	187
	188	if (fit_image_hash_get_value(fit, noffset, &fit_value,
	189	&fit_value_len)) {
	190	*err_msgp = "Can't get hash value property";
	191	return -1;
	192	}
	193
	194	region.data = data;
	195	region.size = size;
	196
	197	if (info.algo->verify(&info, &region, 1, fit_value, fit_value_len)) {
	198	*err_msgp = "Verification failed";
	199	return -1;
	200	}
	201
	202	return 0;
	203	}
	204
	205	static int fit_image_verify_sig(const void *fit, int image_noffset,
	206	const char data, size_t size, const void sig_blob,
	207	int sig_offset)
	208	{
	209	int noffset;
	210	char *err_msg = "";
	211	int verified = 0;
212	int ret;
213
214	/* Process all hash subnodes of the component image node */
364ac5b5	215	fdt_for_each_subnode(fit, noffset, image_noffset) {
56518e71 SG	216	const char *name = fit_get_name(fit, noffset, NULL);
	217
	218	if (!strncmp(name, FIT_SIG_NODENAME,
	219	strlen(FIT_SIG_NODENAME))) {
	220	ret = fit_image_check_sig(fit, noffset, data,
	221	size, -1, &err_msg);
	222	if (ret) {
	223	puts("- ");
	224	} else {
	225	puts("+ ");
	226	verified = 1;
	227	break;
	228	}
	229	}
	230	}
	231
	232	if (noffset == -FDT_ERR_TRUNCATED \|\| noffset == -FDT_ERR_BADSTRUCTURE) {
	233	err_msg = "Corrupted or truncated tree";
	234	goto error;
	235	}
	236
	237	return verified ? 0 : -EPERM;
	238
	239	error:
	240	printf(" error!\n%s for '%s' hash node in '%s' image node\n",
	241	err_msg, fit_get_name(fit, noffset, NULL),
	242	fit_get_name(fit, image_noffset, NULL));
	243	return -1;
	244	}
	245
	246	int fit_image_verify_required_sigs(const void *fit, int image_noffset,
	247	const char data, size_t size, const void sig_blob,
	248	int *no_sigsp)
	249	{
	250	int verify_count = 0;
	251	int noffset;
	252	int sig_node;
	253
	254	/* Work out what we need to verify */
	255	*no_sigsp = 1;
	256	sig_node = fdt_subnode_offset(sig_blob, 0, FIT_SIG_NODENAME);
	257	if (sig_node < 0) {
	258	debug("%s: No signature node found: %s\n", __func__,
	259	fdt_strerror(sig_node));
	260	return 0;
	261	}
	262
364ac5b5	263	fdt_for_each_subnode(sig_blob, noffset, sig_node) {
56518e71 SG	264	const char *required;
	265	int ret;
	266
	267	required = fdt_getprop(sig_blob, noffset, "required", NULL);
	268	if (!required \|\| strcmp(required, "image"))
	269	continue;
	270	ret = fit_image_verify_sig(fit, image_noffset, data, size,
	271	sig_blob, noffset);
	272	if (ret) {
	273	printf("Failed to verify required signature '%s'\n",
	274	fit_get_name(sig_blob, noffset, NULL));
	275	return ret;
	276	}
	277	verify_count++;
	278	}
	279
	280	if (verify_count)
	281	*no_sigsp = 0;
	282
	283	return 0;
	284	}
4d098529 SG	285
	286	int fit_config_check_sig(const void *fit, int noffset, int required_keynode,
	287	char **err_msgp)
	288	{
	289	char * const exc_prop[] = {"data"};
	290	const char prop, end, *name;
	291	struct image_sign_info info;
	292	const uint32_t *strings;
	293	uint8_t *fit_value;
	294	int fit_value_len;
	295	int max_regions;
	296	int i, prop_len;
	297	char path[200];
	298	int count;
	299
	300	debug("%s: fdt=%p, conf='%s', sig='%s'\n", __func__, gd_fdt_blob(),
	301	fit_get_name(fit, noffset, NULL),
	302	fit_get_name(gd_fdt_blob(), required_keynode, NULL));
	303	*err_msgp = NULL;
	304	if (fit_image_setup_verify(&info, fit, noffset, required_keynode,
	305	err_msgp))
	306	return -1;
	307
	308	if (fit_image_hash_get_value(fit, noffset, &fit_value,
	309	&fit_value_len)) {
	310	*err_msgp = "Can't get hash value property";
	311	return -1;
	312	}
	313
	314	/* Count the number of strings in the property */
	315	prop = fdt_getprop(fit, noffset, "hashed-nodes", &prop_len);
	316	end = prop ? prop + prop_len : prop;
	317	for (name = prop, count = 0; name < end; name++)
	318	if (!*name)
	319	count++;
	320	if (!count) {
	321	*err_msgp = "Can't get hashed-nodes property";
	322	return -1;
	323	}
	324
	325	/* Add a sanity check here since we are using the stack */
	326	if (count > IMAGE_MAX_HASHED_NODES) {
	327	*err_msgp = "Number of hashed nodes exceeds maximum";
	328	return -1;
	329	}
	330
	331	/* Create a list of node names from those strings */
	332	char *node_inc[count];
	333
	334	debug("Hash nodes (%d):\n", count);
	335	for (name = prop, i = 0; name < end; name += strlen(name) + 1, i++) {
	336	debug(" '%s'\n", name);
	337	node_inc[i] = (char *)name;
	338	}
	339
	340	/*
	341	* Each node can generate one region for each sub-node. Allow for
	342	* 7 sub-nodes (hash@1, signature@1, etc.) and some extra.
	343	*/
	344	max_regions = 20 + count * 7;
	345	struct fdt_region fdt_regions[max_regions];
	346
	347	/* Get a list of regions to hash */
	348	count = fdt_find_regions(fit, node_inc, count,
349	exc_prop, ARRAY_SIZE(exc_prop),
350	fdt_regions, max_regions - 1,
351	path, sizeof(path), 0);
352	if (count < 0) {
353	*err_msgp = "Failed to hash configuration";
354	return -1;
355	}
356	if (count == 0) {
357	*err_msgp = "No data to hash";
358	return -1;
359	}
360	if (count >= max_regions - 1) {
361	*err_msgp = "Too many hash regions";
362	return -1;
363	}
364
365	/* Add the strings */
366	strings = fdt_getprop(fit, noffset, "hashed-strings", NULL);
367	if (strings) {
368	fdt_regions[count].offset = fdt_off_dt_strings(fit) +
369	fdt32_to_cpu(strings[0]);
370	fdt_regions[count].size = fdt32_to_cpu(strings[1]);
371	count++;
372	}
373
374	/* Allocate the region list on the stack */
375	struct image_region region[count];
376
377	fit_region_make_list(fit, fdt_regions, count, region);
378	if (info.algo->verify(&info, region, count, fit_value,
379	fit_value_len)) {
380	*err_msgp = "Verification failed";
381	return -1;
382	}
383
384	return 0;
385	}
386
387	static int fit_config_verify_sig(const void *fit, int conf_noffset,
388	const void *sig_blob, int sig_offset)
389	{
390	int noffset;
391	char *err_msg = "";
392	int verified = 0;
393	int ret;
394
395	/* Process all hash subnodes of the component conf node */
364ac5b5	396	fdt_for_each_subnode(fit, noffset, conf_noffset) {
4d098529 SG	397	const char *name = fit_get_name(fit, noffset, NULL);
	398
	399	if (!strncmp(name, FIT_SIG_NODENAME,
	400	strlen(FIT_SIG_NODENAME))) {
	401	ret = fit_config_check_sig(fit, noffset, sig_offset,
	402	&err_msg);
	403	if (ret) {
	404	puts("- ");
	405	} else {
	406	puts("+ ");
	407	verified = 1;
	408	break;
	409	}
	410	}
	411	}
	412
	413	if (noffset == -FDT_ERR_TRUNCATED \|\| noffset == -FDT_ERR_BADSTRUCTURE) {
	414	err_msg = "Corrupted or truncated tree";
	415	goto error;
	416	}
	417
	418	return verified ? 0 : -EPERM;
	419
	420	error:
	421	printf(" error!\n%s for '%s' hash node in '%s' config node\n",
	422	err_msg, fit_get_name(fit, noffset, NULL),
	423	fit_get_name(fit, conf_noffset, NULL));
	424	return -1;
	425	}
	426
	427	int fit_config_verify_required_sigs(const void *fit, int conf_noffset,
	428	const void *sig_blob)
	429	{
	430	int noffset;
	431	int sig_node;
	432
	433	/* Work out what we need to verify */
	434	sig_node = fdt_subnode_offset(sig_blob, 0, FIT_SIG_NODENAME);
	435	if (sig_node < 0) {
	436	debug("%s: No signature node found: %s\n", __func__,
	437	fdt_strerror(sig_node));
	438	return 0;
	439	}
	440
364ac5b5	441	fdt_for_each_subnode(sig_blob, noffset, sig_node) {
4d098529 SG	442	const char *required;
	443	int ret;
	444
	445	required = fdt_getprop(sig_blob, noffset, "required", NULL);
	446	if (!required \|\| strcmp(required, "conf"))
	447	continue;
	448	ret = fit_config_verify_sig(fit, conf_noffset, sig_blob,
	449	noffset);
	450	if (ret) {
	451	printf("Failed to verify required signature '%s'\n",
	452	fit_get_name(sig_blob, noffset, NULL));
	453	return ret;
	454	}
	455	}
	456
	457	return 0;
	458	}
	459
	460	int fit_config_verify(const void *fit, int conf_noffset)
	461	{
12df2abe SG	462	return fit_config_verify_required_sigs(fit, conf_noffset,
12df2abe SG	463	gd_fdt_blob());
4d098529	464	}