[people/ms/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,
		SHA1_DER_LEN,
		sha1_der_prefix,
		RSA2048_BYTES,
#if IMAGE_ENABLE_SIGN
		EVP_sha1,
#endif
		hash_calculate,
	},
	{
		"sha256",
		SHA256_SUM_LEN,
		SHA256_DER_LEN,
		sha256_der_prefix,
		RSA2048_BYTES,
#if IMAGE_ENABLE_SIGN
		EVP_sha256,
#endif
		hash_calculate,
	},
	{
		"sha256",
		SHA256_SUM_LEN,
		SHA256_DER_LEN,
		sha256_der_prefix,
		RSA4096_BYTES,
#if IMAGE_ENABLE_SIGN
		EVP_sha256,
#endif
		hash_calculate,
	}

};

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(noffset, fit, 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(noffset, sig_blob, 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(noffset, fit, 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(noffset, sig_blob, 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,
da29f299 AD	37	SHA1_DER_LEN,
da29f299 AD	38	sha1_der_prefix,
db1b5f3d	39	RSA2048_BYTES,
646257d1 HS	40	#if IMAGE_ENABLE_SIGN
646257d1 HS	41	EVP_sha1,
29a23f9d	42	#endif
b37b46f0	43	hash_calculate,
646257d1 HS	44	},
	45	{
	46	"sha256",
	47	SHA256_SUM_LEN,
da29f299 AD	48	SHA256_DER_LEN,
da29f299 AD	49	sha256_der_prefix,
db1b5f3d	50	RSA2048_BYTES,
646257d1 HS	51	#if IMAGE_ENABLE_SIGN
646257d1 HS	52	EVP_sha256,
29a23f9d	53	#endif
b37b46f0	54	hash_calculate,
db1b5f3d HS	55	},
	56	{
	57	"sha256",
	58	SHA256_SUM_LEN,
da29f299 AD	59	SHA256_DER_LEN,
da29f299 AD	60	sha256_der_prefix,
db1b5f3d HS	61	RSA4096_BYTES,
	62	#if IMAGE_ENABLE_SIGN
	63	EVP_sha256,
29a23f9d	64	#endif
b37b46f0	65	hash_calculate,
646257d1	66	}
db1b5f3d	67
646257d1	68	};
db1b5f3d	69
3e569a6b	70	struct image_sig_algo image_sig_algos[] = {
19c402af SG	71	{
	72	"sha1,rsa2048",
	73	rsa_sign,
	74	rsa_add_verify_data,
	75	rsa_verify,
646257d1 HS	76	&checksum_algos[0],
	77	},
	78	{
	79	"sha256,rsa2048",
	80	rsa_sign,
	81	rsa_add_verify_data,
	82	rsa_verify,
	83	&checksum_algos[1],
db1b5f3d HS	84	},
	85	{
	86	"sha256,rsa4096",
	87	rsa_sign,
	88	rsa_add_verify_data,
	89	rsa_verify,
	90	&checksum_algos[2],
19c402af	91	}
db1b5f3d	92
3e569a6b SG	93	};
	94
	95	struct image_sig_algo image_get_sig_algo(const char name)
	96	{
	97	int i;
	98
	99	for (i = 0; i < ARRAY_SIZE(image_sig_algos); i++) {
	100	if (!strcmp(image_sig_algos[i].name, name))
	101	return &image_sig_algos[i];
	102	}
	103
	104	return NULL;
	105	}
56518e71	106
4d098529 SG	107	/**
	108	* fit_region_make_list() - Make a list of image regions
	109	*
	110	* Given a list of fdt_regions, create a list of image_regions. This is a
	111	* simple conversion routine since the FDT and image code use different
	112	* structures.
	113	*
	114	* @fit: FIT image
	115	* @fdt_regions: Pointer to FDT regions
	116	* @count: Number of FDT regions
	117	* @region: Pointer to image regions, which must hold @count records. If
	118	* region is NULL, then (except for an SPL build) the array will be
	119	* allocated.
	120	* @return: Pointer to image regions
	121	*/
	122	struct image_region fit_region_make_list(const void fit,
	123	struct fdt_region *fdt_regions, int count,
	124	struct image_region *region)
	125	{
	126	int i;
	127
	128	debug("Hash regions:\n");
	129	debug("%10s %10s\n", "Offset", "Size");
	130
	131	/*
	132	* Use malloc() except in SPL (to save code size). In SPL the caller
	133	* must allocate the array.
	134	*/
	135	#ifndef CONFIG_SPL_BUILD
	136	if (!region)
	137	region = calloc(sizeof(*region), count);
	138	#endif
	139	if (!region)
	140	return NULL;
	141	for (i = 0; i < count; i++) {
	142	debug("%10x %10x\n", fdt_regions[i].offset,
	143	fdt_regions[i].size);
	144	region[i].data = fit + fdt_regions[i].offset;
	145	region[i].size = fdt_regions[i].size;
	146	}
	147
	148	return region;
	149	}
	150
56518e71 SG	151	static int fit_image_setup_verify(struct image_sign_info *info,
	152	const void *fit, int noffset, int required_keynode,
	153	char **err_msgp)
	154	{
	155	char *algo_name;
	156
	157	if (fit_image_hash_get_algo(fit, noffset, &algo_name)) {
	158	*err_msgp = "Can't get hash algo property";
	159	return -1;
	160	}
	161	memset(info, '\0', sizeof(*info));
	162	info->keyname = fdt_getprop(fit, noffset, "key-name-hint", NULL);
	163	info->fit = (void *)fit;
	164	info->node_offset = noffset;
	165	info->algo = image_get_sig_algo(algo_name);
	166	info->fdt_blob = gd_fdt_blob();
	167	info->required_keynode = required_keynode;
	168	printf("%s:%s", algo_name, info->keyname);
	169
	170	if (!info->algo) {
	171	*err_msgp = "Unknown signature algorithm";
	172	return -1;
	173	}
	174
	175	return 0;
	176	}
	177
	178	int fit_image_check_sig(const void fit, int noffset, const void data,
	179	size_t size, int required_keynode, char **err_msgp)
	180	{
	181	struct image_sign_info info;
	182	struct image_region region;
	183	uint8_t *fit_value;
	184	int fit_value_len;
	185
	186	*err_msgp = NULL;
	187	if (fit_image_setup_verify(&info, fit, noffset, required_keynode,
	188	err_msgp))
	189	return -1;
	190
	191	if (fit_image_hash_get_value(fit, noffset, &fit_value,
	192	&fit_value_len)) {
	193	*err_msgp = "Can't get hash value property";
	194	return -1;
	195	}
	196
	197	region.data = data;
	198	region.size = size;
	199
	200	if (info.algo->verify(&info, &region, 1, fit_value, fit_value_len)) {
	201	*err_msgp = "Verification failed";
	202	return -1;
	203	}
	204
	205	return 0;
	206	}
	207
	208	static int fit_image_verify_sig(const void *fit, int image_noffset,
	209	const char data, size_t size, const void sig_blob,
	210	int sig_offset)
	211	{
	212	int noffset;
	213	char *err_msg = "";
	214	int verified = 0;
215	int ret;
216
217	/* Process all hash subnodes of the component image node */
df87e6b1	218	fdt_for_each_subnode(noffset, fit, image_noffset) {
56518e71 SG	219	const char *name = fit_get_name(fit, noffset, NULL);
	220
	221	if (!strncmp(name, FIT_SIG_NODENAME,
	222	strlen(FIT_SIG_NODENAME))) {
	223	ret = fit_image_check_sig(fit, noffset, data,
	224	size, -1, &err_msg);
	225	if (ret) {
	226	puts("- ");
	227	} else {
	228	puts("+ ");
	229	verified = 1;
	230	break;
	231	}
	232	}
	233	}
	234
	235	if (noffset == -FDT_ERR_TRUNCATED \|\| noffset == -FDT_ERR_BADSTRUCTURE) {
	236	err_msg = "Corrupted or truncated tree";
	237	goto error;
	238	}
	239
	240	return verified ? 0 : -EPERM;
	241
	242	error:
	243	printf(" error!\n%s for '%s' hash node in '%s' image node\n",
	244	err_msg, fit_get_name(fit, noffset, NULL),
	245	fit_get_name(fit, image_noffset, NULL));
	246	return -1;
	247	}
	248
	249	int fit_image_verify_required_sigs(const void *fit, int image_noffset,
	250	const char data, size_t size, const void sig_blob,
	251	int *no_sigsp)
	252	{
	253	int verify_count = 0;
	254	int noffset;
	255	int sig_node;
	256
	257	/* Work out what we need to verify */
	258	*no_sigsp = 1;
	259	sig_node = fdt_subnode_offset(sig_blob, 0, FIT_SIG_NODENAME);
	260	if (sig_node < 0) {
	261	debug("%s: No signature node found: %s\n", __func__,
	262	fdt_strerror(sig_node));
	263	return 0;
	264	}
	265
df87e6b1	266	fdt_for_each_subnode(noffset, sig_blob, sig_node) {
56518e71 SG	267	const char *required;
	268	int ret;
	269
	270	required = fdt_getprop(sig_blob, noffset, "required", NULL);
	271	if (!required \|\| strcmp(required, "image"))
	272	continue;
	273	ret = fit_image_verify_sig(fit, image_noffset, data, size,
	274	sig_blob, noffset);
	275	if (ret) {
	276	printf("Failed to verify required signature '%s'\n",
	277	fit_get_name(sig_blob, noffset, NULL));
	278	return ret;
	279	}
	280	verify_count++;
	281	}
	282
	283	if (verify_count)
	284	*no_sigsp = 0;
	285
	286	return 0;
	287	}
4d098529 SG	288
	289	int fit_config_check_sig(const void *fit, int noffset, int required_keynode,
	290	char **err_msgp)
	291	{
	292	char * const exc_prop[] = {"data"};
	293	const char prop, end, *name;
	294	struct image_sign_info info;
	295	const uint32_t *strings;
	296	uint8_t *fit_value;
	297	int fit_value_len;
	298	int max_regions;
	299	int i, prop_len;
	300	char path[200];
	301	int count;
	302
	303	debug("%s: fdt=%p, conf='%s', sig='%s'\n", __func__, gd_fdt_blob(),
	304	fit_get_name(fit, noffset, NULL),
	305	fit_get_name(gd_fdt_blob(), required_keynode, NULL));
	306	*err_msgp = NULL;
	307	if (fit_image_setup_verify(&info, fit, noffset, required_keynode,
	308	err_msgp))
	309	return -1;
	310
	311	if (fit_image_hash_get_value(fit, noffset, &fit_value,
	312	&fit_value_len)) {
	313	*err_msgp = "Can't get hash value property";
	314	return -1;
	315	}
	316
	317	/* Count the number of strings in the property */
	318	prop = fdt_getprop(fit, noffset, "hashed-nodes", &prop_len);
	319	end = prop ? prop + prop_len : prop;
	320	for (name = prop, count = 0; name < end; name++)
	321	if (!*name)
	322	count++;
	323	if (!count) {
	324	*err_msgp = "Can't get hashed-nodes property";
	325	return -1;
	326	}
	327
	328	/* Add a sanity check here since we are using the stack */
	329	if (count > IMAGE_MAX_HASHED_NODES) {
	330	*err_msgp = "Number of hashed nodes exceeds maximum";
	331	return -1;
	332	}
	333
	334	/* Create a list of node names from those strings */
	335	char *node_inc[count];
	336
	337	debug("Hash nodes (%d):\n", count);
	338	for (name = prop, i = 0; name < end; name += strlen(name) + 1, i++) {
	339	debug(" '%s'\n", name);
	340	node_inc[i] = (char *)name;
	341	}
	342
	343	/*
	344	* Each node can generate one region for each sub-node. Allow for
	345	* 7 sub-nodes (hash@1, signature@1, etc.) and some extra.
	346	*/
	347	max_regions = 20 + count * 7;
	348	struct fdt_region fdt_regions[max_regions];
	349
	350	/* Get a list of regions to hash */
	351	count = fdt_find_regions(fit, node_inc, count,
352	exc_prop, ARRAY_SIZE(exc_prop),
353	fdt_regions, max_regions - 1,
354	path, sizeof(path), 0);
355	if (count < 0) {
356	*err_msgp = "Failed to hash configuration";
357	return -1;
358	}
359	if (count == 0) {
360	*err_msgp = "No data to hash";
361	return -1;
362	}
363	if (count >= max_regions - 1) {
364	*err_msgp = "Too many hash regions";
365	return -1;
366	}
367
368	/* Add the strings */
369	strings = fdt_getprop(fit, noffset, "hashed-strings", NULL);
370	if (strings) {
371	fdt_regions[count].offset = fdt_off_dt_strings(fit) +
372	fdt32_to_cpu(strings[0]);
373	fdt_regions[count].size = fdt32_to_cpu(strings[1]);
374	count++;
375	}
376
377	/* Allocate the region list on the stack */
378	struct image_region region[count];
379
380	fit_region_make_list(fit, fdt_regions, count, region);
381	if (info.algo->verify(&info, region, count, fit_value,
382	fit_value_len)) {
383	*err_msgp = "Verification failed";
384	return -1;
385	}
386
387	return 0;
388	}
389
390	static int fit_config_verify_sig(const void *fit, int conf_noffset,
391	const void *sig_blob, int sig_offset)
392	{
393	int noffset;
394	char *err_msg = "";
395	int verified = 0;
396	int ret;
397
398	/* Process all hash subnodes of the component conf node */
df87e6b1	399	fdt_for_each_subnode(noffset, fit, conf_noffset) {
4d098529 SG	400	const char *name = fit_get_name(fit, noffset, NULL);
	401
	402	if (!strncmp(name, FIT_SIG_NODENAME,
	403	strlen(FIT_SIG_NODENAME))) {
	404	ret = fit_config_check_sig(fit, noffset, sig_offset,
	405	&err_msg);
	406	if (ret) {
	407	puts("- ");
	408	} else {
	409	puts("+ ");
	410	verified = 1;
	411	break;
	412	}
	413	}
	414	}
	415
	416	if (noffset == -FDT_ERR_TRUNCATED \|\| noffset == -FDT_ERR_BADSTRUCTURE) {
	417	err_msg = "Corrupted or truncated tree";
	418	goto error;
	419	}
	420
	421	return verified ? 0 : -EPERM;
	422
	423	error:
	424	printf(" error!\n%s for '%s' hash node in '%s' config node\n",
	425	err_msg, fit_get_name(fit, noffset, NULL),
	426	fit_get_name(fit, conf_noffset, NULL));
	427	return -1;
	428	}
	429
	430	int fit_config_verify_required_sigs(const void *fit, int conf_noffset,
	431	const void *sig_blob)
	432	{
	433	int noffset;
	434	int sig_node;
	435
	436	/* Work out what we need to verify */
	437	sig_node = fdt_subnode_offset(sig_blob, 0, FIT_SIG_NODENAME);
	438	if (sig_node < 0) {
	439	debug("%s: No signature node found: %s\n", __func__,
	440	fdt_strerror(sig_node));
	441	return 0;
	442	}
	443
df87e6b1	444	fdt_for_each_subnode(noffset, sig_blob, sig_node) {
4d098529 SG	445	const char *required;
	446	int ret;
	447
	448	required = fdt_getprop(sig_blob, noffset, "required", NULL);
	449	if (!required \|\| strcmp(required, "conf"))
	450	continue;
	451	ret = fit_config_verify_sig(fit, conf_noffset, sig_blob,
	452	noffset);
	453	if (ret) {
	454	printf("Failed to verify required signature '%s'\n",
	455	fit_get_name(sig_blob, noffset, NULL));
	456	return ret;
	457	}
	458	}
	459
	460	return 0;
	461	}
	462
	463	int fit_config_verify(const void *fit, int conf_noffset)
	464	{
12df2abe SG	465	return fit_config_verify_required_sigs(fit, conf_noffset,
12df2abe SG	466	gd_fdt_blob());
4d098529	467	}