[U-Boot] [PATCH v4 1/6] lib: rsa: decouple rsa from FIT image verification

[AKASHI Takahiro <takahiro.akashi@linaro.org>]

Introduce new configuration, CONFIG_RSA_VERIFY which will decouple building
RSA functions from FIT verification and allow for adding a RSA-based
signature verification for other file formats, in particular PE file
for UEFI secure boot.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
---
 Kconfig                |   1 +
 common/Makefile        |   3 +-
 common/image-fit-sig.c | 417 +++++++++++++++++++++++++++++++++++++++++
 common/image-fit.c     |   6 +-
 common/image-sig.c     | 396 --------------------------------------
 include/image.h        |  13 +-
 lib/rsa/Kconfig        |  12 ++
 lib/rsa/Makefile       |   2 +-
 lib/rsa/rsa-verify.c   |  78 +++++---
 tools/Makefile         |   2 +-
 10 files changed, 493 insertions(+), 437 deletions(-)
 create mode 100644 common/image-fit-sig.c

diff --git a/Kconfig b/Kconfig
index 66b059f749a7..63690514b261 100644
--- a/Kconfig
+++ b/Kconfig
@@ -417,6 +417,7 @@ config SPL_FIT_SIGNATURE
 	depends on SPL_DM
 	select SPL_FIT
 	select SPL_RSA
+	select SPL_RSA_VERIFY
 
 config SPL_LOAD_FIT
 	bool "Enable SPL loading U-Boot as a FIT (basic fitImage features)"
diff --git a/common/Makefile b/common/Makefile
index 302d8beaf356..d66c0068bb88 100644
--- a/common/Makefile
+++ b/common/Makefile
@@ -112,7 +112,8 @@ obj-$(CONFIG_ANDROID_BOOT_IMAGE) += image-android.o
 obj-$(CONFIG_$(SPL_TPL_)OF_LIBFDT) += image-fdt.o
 obj-$(CONFIG_$(SPL_TPL_)FIT) += image-fit.o
 obj-$(CONFIG_$(SPL_)MULTI_DTB_FIT) += boot_fit.o common_fit.o
-obj-$(CONFIG_$(SPL_TPL_)FIT_SIGNATURE) += image-sig.o
+obj-$(CONFIG_$(SPL_)RSA_VERIFY) += image-sig.o
+obj-$(CONFIG_$(SPL_TPL_)FIT_SIGNATURE) += image-fit-sig.o
 obj-$(CONFIG_IO_TRACE) += iotrace.o
 obj-y += memsize.o
 obj-y += stdio.o
diff --git a/common/image-fit-sig.c b/common/image-fit-sig.c
new file mode 100644
index 000000000000..f6caeb0c5901
--- /dev/null
+++ b/common/image-fit-sig.c
@@ -0,0 +1,417 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (c) 2013, Google Inc.
+ */
+
+#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
+
+/**
+ * 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;
+	const char *padding_name;
+
+	if (fdt_totalsize(fit) > CONFIG_FIT_SIGNATURE_MAX_SIZE) {
+		*err_msgp = "Total size too large";
+		return 1;
+	}
+
+	if (fit_image_hash_get_algo(fit, noffset, &algo_name)) {
+		*err_msgp = "Can't get hash algo property";
+		return -1;
+	}
+
+	padding_name = fdt_getprop(fit, noffset, "padding", NULL);
+	if (!padding_name)
+		padding_name = RSA_DEFAULT_PADDING_NAME;
+
+	memset(info, '\0', sizeof(*info));
+	info->keyname = fdt_getprop(fit, noffset, "key-name-hint", NULL);
+	info->fit = (void *)fit;
+	info->node_offset = noffset;
+	info->name = algo_name;
+	info->checksum = image_get_checksum_algo(algo_name);
+	info->crypto = image_get_crypto_algo(algo_name);
+	info->padding = image_get_padding_algo(padding_name);
+	info->fdt_blob = gd_fdt_blob();
+	info->required_keynode = required_keynode;
+	printf("%s:%s", algo_name, info->keyname);
+
+	if (!info->checksum || !info->crypto || !info->padding) {
+		*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.crypto->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;
+	}
+
+	if (prop && prop_len > 0 && prop[prop_len - 1] != '\0') {
+		*err_msgp = "hashed-nodes property must be null-terminated";
+		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) {
+		/*
+		 * The strings region offset must be a static 0x0.
+		 * This is set in tool/image-host.c
+		 */
+		fdt_regions[count].offset = fdt_off_dt_strings(fit);
+		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.crypto->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());
+}
diff --git a/common/image-fit.c b/common/image-fit.c
index 5c63c769de27..2d78f0b47da2 100644
--- a/common/image-fit.c
+++ b/common/image-fit.c
@@ -1216,7 +1216,7 @@ int fit_image_verify_with_data(const void *fit, int image_noffset,
 	int ret;
 
 	/* Verify all required signatures */
-	if (IMAGE_ENABLE_VERIFY &&
+	if (FIT_IMAGE_ENABLE_VERIFY &&
 	    fit_image_verify_required_sigs(fit, image_noffset, data, size,
 					   gd_fdt_blob(), &verify_all)) {
 		err_msg = "Unable to verify required signature";
@@ -1238,7 +1238,7 @@ int fit_image_verify_with_data(const void *fit, int image_noffset,
 						 &err_msg))
 				goto error;
 			puts("+ ");
-		} else if (IMAGE_ENABLE_VERIFY && verify_all &&
+		} else if (FIT_IMAGE_ENABLE_VERIFY && verify_all &&
 				!strncmp(name, FIT_SIG_NODENAME,
 					strlen(FIT_SIG_NODENAME))) {
 			ret = fit_image_check_sig(fit, noffset, data,
@@ -1870,7 +1870,7 @@ int fit_image_load(bootm_headers_t *images, ulong addr,
 		if (image_type == IH_TYPE_KERNEL)
 			images->fit_uname_cfg = fit_base_uname_config;
 
-		if (IMAGE_ENABLE_VERIFY && images->verify) {
+		if (FIT_IMAGE_ENABLE_VERIFY && images->verify) {
 			puts("   Verifying Hash Integrity ... ");
 			if (fit_config_verify(fit, cfg_noffset)) {
 				puts("Bad Data Hash\n");
diff --git a/common/image-sig.c b/common/image-sig.c
index 639a1124504f..84b2c0439cf8 100644
--- a/common/image-sig.c
+++ b/common/image-sig.c
@@ -17,18 +17,6 @@ DECLARE_GLOBAL_DATA_PTR;
 
 #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[] = {
 	{
 		.name = "sha1",
@@ -162,387 +150,3 @@ struct padding_algo *image_get_padding_algo(const char *name)
 
 	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;
-	const char *padding_name;
-
-	if (fdt_totalsize(fit) > CONFIG_FIT_SIGNATURE_MAX_SIZE) {
-		*err_msgp = "Total size too large";
-		return 1;
-	}
-
-	if (fit_image_hash_get_algo(fit, noffset, &algo_name)) {
-		*err_msgp = "Can't get hash algo property";
-		return -1;
-	}
-
-	padding_name = fdt_getprop(fit, noffset, "padding", NULL);
-	if (!padding_name)
-		padding_name = RSA_DEFAULT_PADDING_NAME;
-
-	memset(info, '\0', sizeof(*info));
-	info->keyname = fdt_getprop(fit, noffset, "key-name-hint", NULL);
-	info->fit = (void *)fit;
-	info->node_offset = noffset;
-	info->name = algo_name;
-	info->checksum = image_get_checksum_algo(algo_name);
-	info->crypto = image_get_crypto_algo(algo_name);
-	info->padding = image_get_padding_algo(padding_name);
-	info->fdt_blob = gd_fdt_blob();
-	info->required_keynode = required_keynode;
-	printf("%s:%s", algo_name, info->keyname);
-
-	if (!info->checksum || !info->crypto || !info->padding) {
-		*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.crypto->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;
-	}
-
-	if (prop && prop_len > 0 && prop[prop_len - 1] != '\0') {
-		*err_msgp = "hashed-nodes property must be null-terminated";
-		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) {
-		/*
-		 * The strings region offset must be a static 0x0.
-		 * This is set in tool/image-host.c
-		 */
-		fdt_regions[count].offset = fdt_off_dt_strings(fit);
-		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.crypto->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());
-}
diff --git a/include/image.h b/include/image.h
index f4d2aaf53e87..7eb0b4b53184 100644
--- a/include/image.h
+++ b/include/image.h
@@ -1086,6 +1086,7 @@ int fit_conf_get_prop_node(const void *fit, int noffset,
 
 int fit_check_ramdisk(const void *fit, int os_noffset,
 		uint8_t arch, int verify);
+#endif /* IMAGE_ENABLE_FIT */
 
 int calculate_hash(const void *data, int data_len, const char *algo,
 			uint8_t *value, int *value_len);
@@ -1098,16 +1099,20 @@ int calculate_hash(const void *data, int data_len, const char *algo,
 # if defined(CONFIG_FIT_SIGNATURE)
 #  define IMAGE_ENABLE_SIGN	1
 #  define IMAGE_ENABLE_VERIFY	1
+#  define FIT_IMAGE_ENABLE_VERIFY	1
 #  include <openssl/evp.h>
 # else
 #  define IMAGE_ENABLE_SIGN	0
 #  define IMAGE_ENABLE_VERIFY	0
+#  define FIT_IMAGE_ENABLE_VERIFY	0
 # endif
 #else
 # define IMAGE_ENABLE_SIGN	0
-# define IMAGE_ENABLE_VERIFY	CONFIG_IS_ENABLED(FIT_SIGNATURE)
+# define IMAGE_ENABLE_VERIFY		CONFIG_IS_ENABLED(RSA_VERIFY)
+# define FIT_IMAGE_ENABLE_VERIFY	CONFIG_IS_ENABLED(FIT_SIGNATURE)
 #endif
 
+#if IMAGE_ENABLE_FIT
 #ifdef USE_HOSTCC
 void *image_get_host_blob(void);
 void image_set_host_blob(void *host_blob);
@@ -1121,6 +1126,7 @@ void image_set_host_blob(void *host_blob);
 #else
 #define IMAGE_ENABLE_BEST_MATCH	0
 #endif
+#endif /* IMAGE_ENABLE_FIT */
 
 /* Information passed to the signing routines */
 struct image_sign_info {
@@ -1137,7 +1143,6 @@ struct image_sign_info {
 	const char *require_keys;	/* Value for 'required' property */
 	const char *engine_id;		/* Engine to use for signing */
 };
-#endif /* Allow struct image_region to always be defined for rsa.h */
 
 /* A part of an image, used for hashing */
 struct image_region {
@@ -1145,8 +1150,6 @@ struct image_region {
 	int size;
 };
 
-#if IMAGE_ENABLE_FIT
-
 #if IMAGE_ENABLE_VERIFY
 # include <u-boot/rsa-checksum.h>
 #endif
@@ -1247,6 +1250,8 @@ struct crypto_algo *image_get_crypto_algo(const char *full_name);
  */
 struct padding_algo *image_get_padding_algo(const char *name);
 
+#if IMAGE_ENABLE_FIT
+
 /**
  * fit_image_verify_required_sigs() - Verify signatures marked as 'required'
  *
diff --git a/lib/rsa/Kconfig b/lib/rsa/Kconfig
index 2b33f323bccc..03ffa2969048 100644
--- a/lib/rsa/Kconfig
+++ b/lib/rsa/Kconfig
@@ -1,5 +1,6 @@
 config RSA
 	bool "Use RSA Library"
+	select RSA_VERIFY
 	select RSA_FREESCALE_EXP if FSL_CAAM && !ARCH_MX7 && !ARCH_MX6 && !ARCH_MX5
 	select RSA_SOFTWARE_EXP if !RSA_FREESCALE_EXP
 	help
@@ -17,6 +18,17 @@ if RSA
 
 config SPL_RSA
 	bool "Use RSA Library within SPL"
+	select SPL_RSA_VERIFY
+
+config SPL_RSA_VERIFY
+	bool
+	help
+	  Add RSA signature verification support in SPL.
+
+config RSA_VERIFY
+	bool
+	help
+	  Add RSA signature verification support.
 
 config RSA_SOFTWARE_EXP
 	bool "Enable driver for RSA Modular Exponentiation in software"
diff --git a/lib/rsa/Makefile b/lib/rsa/Makefile
index a51c6e1685fb..c07305188e0c 100644
--- a/lib/rsa/Makefile
+++ b/lib/rsa/Makefile
@@ -5,5 +5,5 @@
 # (C) Copyright 2000-2007
 # Wolfgang Denk, DENX Software Engineering, wd at denx.de.
 
-obj-$(CONFIG_$(SPL_)FIT_SIGNATURE) += rsa-verify.o rsa-checksum.o
+obj-$(CONFIG_$(SPL_)RSA_VERIFY) += rsa-verify.o rsa-checksum.o
 obj-$(CONFIG_RSA_SOFTWARE_EXP) += rsa-mod-exp.o
diff --git a/lib/rsa/rsa-verify.c b/lib/rsa/rsa-verify.c
index 82dc513260e2..d2fd0692fa13 100644
--- a/lib/rsa/rsa-verify.c
+++ b/lib/rsa/rsa-verify.c
@@ -270,6 +270,7 @@ out:
 }
 #endif
 
+#if CONFIG_IS_ENABLED(FIT_SIGNATURE)
 /**
  * rsa_verify_key() - Verify a signature against some data using RSA Key
  *
@@ -341,7 +342,9 @@ static int rsa_verify_key(struct image_sign_info *info,
 
 	return 0;
 }
+#endif
 
+#if CONFIG_IS_ENABLED(FIT_SIGNATURE)
 /**
  * rsa_verify_with_keynode() - Verify a signature against some data using
  * information in node with prperties of RSA Key like modulus, exponent etc.
@@ -395,18 +398,22 @@ static int rsa_verify_with_keynode(struct image_sign_info *info,
 
 	return ret;
 }
+#else
+static int rsa_verify_with_keynode(struct image_sign_info *info,
+				   const void *hash, uint8_t *sig,
+				   uint sig_len, int node)
+{
+	return -EACCES;
+}
+#endif
 
 int rsa_verify(struct image_sign_info *info,
 	       const struct image_region region[], int region_count,
 	       uint8_t *sig, uint sig_len)
 {
-	const void *blob = info->fdt_blob;
 	/* Reserve memory for maximum checksum-length */
 	uint8_t hash[info->crypto->key_len];
-	int ndepth, noffset;
-	int sig_node, node;
-	char name[100];
-	int ret;
+	int ret = -EACCES;
 
 	/*
 	 * Verify that the checksum-length does not exceed the
@@ -419,12 +426,6 @@ int rsa_verify(struct image_sign_info *info,
 		return -EINVAL;
 	}
 
-	sig_node = fdt_subnode_offset(blob, 0, FIT_SIG_NODENAME);
-	if (sig_node < 0) {
-		debug("%s: No signature node found\n", __func__);
-		return -ENOENT;
-	}
-
 	/* Calculate checksum with checksum-algorithm */
 	ret = info->checksum->calculate(info->checksum->name,
 					region, region_count, hash);
@@ -433,29 +434,44 @@ int rsa_verify(struct image_sign_info *info,
 		return -EINVAL;
 	}
 
-	/* See if we must use a particular key */
-	if (info->required_keynode != -1) {
-		ret = rsa_verify_with_keynode(info, hash, sig, sig_len,
-			info->required_keynode);
-		return ret;
-	}
+	if (CONFIG_IS_ENABLED(FIT_SIGNATURE)) {
+		const void *blob = info->fdt_blob;
+		int ndepth, noffset;
+		int sig_node, node;
+		char name[100];
 
-	/* Look for a key that matches our hint */
-	snprintf(name, sizeof(name), "key-%s", info->keyname);
-	node = fdt_subnode_offset(blob, sig_node, name);
-	ret = rsa_verify_with_keynode(info, hash, sig, sig_len, node);
-	if (!ret)
-		return ret;
+		sig_node = fdt_subnode_offset(blob, 0, FIT_SIG_NODENAME);
+		if (sig_node < 0) {
+			debug("%s: No signature node found\n", __func__);
+			return -ENOENT;
+		}
 
-	/* No luck, so try each of the keys in turn */
-	for (ndepth = 0, noffset = fdt_next_node(info->fit, sig_node, &ndepth);
-			(noffset >= 0) && (ndepth > 0);
-			noffset = fdt_next_node(info->fit, noffset, &ndepth)) {
-		if (ndepth == 1 && noffset != node) {
+		/* See if we must use a particular key */
+		if (info->required_keynode != -1) {
 			ret = rsa_verify_with_keynode(info, hash, sig, sig_len,
-						      noffset);
-			if (!ret)
-				break;
+						      info->required_keynode);
+			return ret;
+		}
+
+		/* Look for a key that matches our hint */
+		snprintf(name, sizeof(name), "key-%s", info->keyname);
+		node = fdt_subnode_offset(blob, sig_node, name);
+		ret = rsa_verify_with_keynode(info, hash, sig, sig_len, node);
+		if (!ret)
+			return ret;
+
+		/* No luck, so try each of the keys in turn */
+		for (ndepth = 0, noffset = fdt_next_node(info->fit, sig_node,
+							 &ndepth);
+		     (noffset >= 0) && (ndepth > 0);
+		     noffset = fdt_next_node(info->fit, noffset, &ndepth)) {
+			if (ndepth == 1 && noffset != node) {
+				ret = rsa_verify_with_keynode(info, hash,
+							      sig, sig_len,
+							      noffset);
+				if (!ret)
+					break;
+			}
 		}
 	}
 
diff --git a/tools/Makefile b/tools/Makefile
index 345bc84e48db..1f885cca7034 100644
--- a/tools/Makefile
+++ b/tools/Makefile
@@ -58,7 +58,7 @@ hostprogs-$(CONFIG_FIT_SIGNATURE) += fit_info fit_check_sign
 hostprogs-$(CONFIG_CMD_BOOTEFI_SELFTEST) += file2include
 
 FIT_OBJS-$(CONFIG_FIT) := fit_common.o fit_image.o image-host.o common/image-fit.o
-FIT_SIG_OBJS-$(CONFIG_FIT_SIGNATURE) := common/image-sig.o
+FIT_SIG_OBJS-$(CONFIG_FIT_SIGNATURE) := common/image-sig.o common/image-fit-sig.o
 
 # The following files are synced with upstream DTC.
 # Use synced versions from scripts/dtc/libfdt/.
-- 
2.21.0