[RFC 3/4] FIT: add FIT image support

[Jan Luebbe <jlu@pengutronix.de>]

The FIT image format was defined for U-Boot and has been adopted by the
depthcharge project as well. It is intended to be a replacement for the
uimage format and has been extended to support signing of kernel,
initramfs and devicetree images. This patch adds support for booting FIT
images to barebox.

To verify signed images, the RSA public key data must be available in
the internal device tree. Currently only signature verification on
configurations (which contains hashes of all referenced images) are
implemented, as this is the most useful use case and reduces the
complexity of the implementation.

The host tool (mkimage) to sign images has not yet been imported from U-Boot.

Signed-off-by: Jan Luebbe <jlu@pengutronix.de>
---
 arch/arm/lib/bootm.c |  74 +++++++
 commands/Kconfig     |   8 +
 common/Kconfig       |   7 +
 common/Makefile      |   1 +
 common/image-fit.c   | 585 +++++++++++++++++++++++++++++++++++++++++++++++++++
 include/image-fit.h  |  42 ++++
 6 files changed, 717 insertions(+)
 create mode 100644 common/image-fit.c
 create mode 100644 include/image-fit.h

diff --git a/arch/arm/lib/bootm.c b/arch/arm/lib/bootm.c
index 8327c3f5603a..6d30c594bdc2 100644
--- a/arch/arm/lib/bootm.c
+++ b/arch/arm/lib/bootm.c
@@ -552,6 +552,78 @@ BAREBOX_MAGICVAR(aimage_noverwrite_bootargs, "Disable overwrite of the bootargs
 BAREBOX_MAGICVAR(aimage_noverwrite_tags, "Disable overwrite of the tags addr with the one present in aimage");
 #endif
 
+#include <image-fit.h>
+
+static int do_bootm_arm_fit(struct image_data *data)
+{
+	struct fit_handle *handle;
+	int ret;
+	unsigned long mem_free;
+	unsigned long mem_start, mem_size;
+
+	handle = fit_open(data->os_file, data->os_num, data->verbose);
+	if (!handle)
+		return -EINVAL;
+
+	ret = sdram_start_and_size(&mem_start, &mem_size);
+	if (ret)
+		return ret;
+
+	/* no support for custom load address */
+	data->os_address = mem_start + PAGE_ALIGN(handle->kernel_size * 4);
+	data->os_res = request_sdram_region("fit-kernel", data->os_address, handle->kernel_size);
+	if (!data->os_res) {
+		pr_err("Cannot request region 0x%08lx - 0x%08lx\n",
+				data->os_address, handle->kernel_size);
+		ret = -ENOMEM;
+		goto err_out;
+	}
+	memcpy((void *)data->os_res->start, handle->kernel, handle->kernel_size);
+
+	/*
+	 * Put oftree/initrd close behind compressed kernel image to avoid
+	 * placing it outside of the kernels lowmem.
+	 */
+	if (handle->initrd_size) {
+		data->initrd_address = PAGE_ALIGN(data->os_res->end + SZ_1M);
+		data->initrd_res = request_sdram_region("fit-initrd", data->initrd_address, handle->initrd_size);
+		if (!data->initrd_res) {
+			ret = -ENOMEM;
+			goto err_out;
+		}
+		memcpy((void *)data->initrd_res->start, handle->initrd, handle->initrd_size);
+	}
+
+	data->of_root_node = of_unflatten_dtb(handle->oftree);
+	if (!data->of_root_node) {
+		pr_err("unable to unflatten devicetree\n");
+		ret = -EINVAL;
+		goto err_out;
+	}
+
+	/*
+	 * Put devicetree right after initrd if present or after the kernel
+	 * if not.
+	 */
+	if (data->initrd_res)
+		mem_free = PAGE_ALIGN(data->initrd_res->end);
+	else
+		mem_free = PAGE_ALIGN(data->os_res->end + SZ_1M);
+
+	return __do_bootm_linux(data, mem_free, 0);
+
+err_out:
+	if (handle)
+		fit_close(handle);
+	return ret;
+}
+
+static struct image_handler arm_fit_handler = {
+        .name = "FIT image",
+        .bootm = do_bootm_arm_fit,
+        .filetype = filetype_oftree,
+};
+
 static struct binfmt_hook binfmt_aimage_hook = {
 	.type = filetype_aimage,
 	.exec = "bootm",
@@ -577,6 +649,8 @@ static int armlinux_register_image_handler(void)
 		register_image_handler(&aimage_handler);
 		binfmt_register(&binfmt_aimage_hook);
 	}
+	if (IS_BUILTIN(CONFIG_CMD_BOOTM_FITIMAGE))
+	        register_image_handler(&arm_fit_handler);
 	binfmt_register(&binfmt_arm_zimage_hook);
 	binfmt_register(&binfmt_barebox_hook);
 
diff --git a/commands/Kconfig b/commands/Kconfig
index e4f68e7bda31..8d8fd46c15ec 100644
--- a/commands/Kconfig
+++ b/commands/Kconfig
@@ -402,6 +402,14 @@ config CMD_BOOTM_AIMAGE
 	help
 	  Support using Android Images.
 
+config CMD_BOOTM_FITIMAGE
+	bool
+	prompt "FIT image support"
+	select FITIMAGE
+	depends on CMD_BOOTM && (ARM || SANDBOX)
+	help
+	  Support using FIT Images.
+
 config CMD_BOOTU
 	tristate
 	default y
diff --git a/common/Kconfig b/common/Kconfig
index d4373431aae8..9dd0b65ef8ae 100644
--- a/common/Kconfig
+++ b/common/Kconfig
@@ -66,6 +66,13 @@ config UIMAGE
 	select CRC32
 	bool
 
+config FITIMAGE
+	bool
+	select OFTREE
+	select SHA1
+	select SHA256
+	select RSA
+
 config LOGBUF
 	bool
 
diff --git a/common/Makefile b/common/Makefile
index ee5dca70236e..a8008292f0d8 100644
--- a/common/Makefile
+++ b/common/Makefile
@@ -44,6 +44,7 @@ obj-$(CONFIG_RESET_SOURCE)	+= reset_source.o
 obj-$(CONFIG_SHELL_HUSH)	+= hush.o
 obj-$(CONFIG_SHELL_SIMPLE)	+= parser.o
 obj-$(CONFIG_UIMAGE)		+= image.o uimage.o
+obj-$(CONFIG_FITIMAGE)		+= image-fit.o
 obj-$(CONFIG_MENUTREE)		+= menutree.o
 obj-$(CONFIG_EFI_GUID)		+= efi-guid.o
 obj-$(CONFIG_EFI_DEVICEPATH)	+= efi-devicepath.o
diff --git a/common/image-fit.c b/common/image-fit.c
new file mode 100644
index 000000000000..77df5e5f4205
--- /dev/null
+++ b/common/image-fit.c
@@ -0,0 +1,585 @@
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ *
+ * Copyright (C) Jan Lübbe, 2014
+ */
+
+#include <common.h>
+#include <init.h>
+#include <boot.h>
+#include <libfile.h>
+#include <fdt.h>
+#include <digest.h>
+#include <of.h>
+#include <fs.h>
+#include <malloc.h>
+#include <linux/ctype.h>
+#include <asm/byteorder.h>
+#include <errno.h>
+#include <linux/err.h>
+#include <stringlist.h>
+#include <rsa.h>
+#include <image-fit.h>
+
+#define FDT_MAX_DEPTH	32
+#define FDT_MAX_PATH_LEN 200
+
+#define CHECK_LEVEL_NONE 0
+#define CHECK_LEVEL_HASH 1
+#define CHECK_LEVEL_SIG 2
+#define CHECK_LEVEL_MAX 3
+
+static uint32_t dt_struct_advance(struct fdt_header *f, uint32_t dt, int size)
+{
+	dt += size;
+	dt = ALIGN(dt, 4);
+
+	if (dt > f->off_dt_struct + f->size_dt_struct)
+		return 0;
+
+	return dt;
+}
+
+static char *dt_string(struct fdt_header *f, char *strstart, uint32_t ofs)
+{
+	if (ofs > f->size_dt_strings)
+		return NULL;
+	else
+		return strstart + ofs;
+}
+
+static int of_read_string_list(struct device_node *np, const char *name, struct string_list *sl)
+{
+	struct property *prop;
+	const char *s;
+
+	of_property_for_each_string(np, name, prop, s) {
+		string_list_add(sl, s);
+	}
+
+	return prop ? 0 : -EINVAL;
+}
+
+static int fit_digest(void *fit, struct digest *digest,
+		struct string_list *inc_nodes, struct string_list *exc_props,
+		uint32_t hashed_strings_start, uint32_t hashed_strings_size)
+{
+	struct fdt_header *fdt = fit;
+	uint32_t dt_struct;
+	void *dt_strings;
+	struct fdt_header f;
+	int stack[FDT_MAX_DEPTH];
+	char path[FDT_MAX_PATH_LEN];
+	char *end;
+	uint32_t tag;
+	int start = -1;
+	int depth = -1;
+	int want = 0;
+
+	f.totalsize = fdt32_to_cpu(fdt->totalsize);
+	f.off_dt_struct = fdt32_to_cpu(fdt->off_dt_struct);
+	f.size_dt_struct = fdt32_to_cpu(fdt->size_dt_struct);
+	f.off_dt_strings = fdt32_to_cpu(fdt->off_dt_strings);
+	f.size_dt_strings = fdt32_to_cpu(fdt->size_dt_strings);
+
+	if (hashed_strings_start > f.size_dt_strings ||
+	    hashed_strings_size > f.size_dt_strings ||
+	    hashed_strings_start + hashed_strings_size > f.size_dt_strings) {
+		pr_err("%s: hashed-strings too large\n", __func__);
+		return -EINVAL;
+	}
+
+	dt_struct = f.off_dt_struct;
+	dt_strings = (void *)fdt + f.off_dt_strings;
+
+	end = path;
+	*end = '\0';
+
+	do {
+		const struct fdt_property *fdt_prop;
+		const struct fdt_node_header *fnh;
+		const char *name;
+		int include = 0;
+		int stop_at = 0;
+		int offset = dt_struct;
+		int maxlen, len;
+
+		tag = be32_to_cpu(*(uint32_t *)(fit + dt_struct));
+
+		switch (tag) {
+		case FDT_BEGIN_NODE:
+			fnh = fit + dt_struct;
+			name = fnh->name;
+			maxlen = (unsigned long)fdt + f.off_dt_struct +
+				f.size_dt_struct - (unsigned long)name;
+
+			len = strnlen(name, maxlen + 1);
+			if (len > maxlen)
+				return -ESPIPE;
+
+			dt_struct = dt_struct_advance(&f, dt_struct,
+					sizeof(struct fdt_node_header) + len + 1);
+
+			depth++;
+			if (depth == FDT_MAX_DEPTH)
+				return -ESPIPE;
+			if (end - path + 2 + len >= FDT_MAX_PATH_LEN)
+				return -ESPIPE;
+			if (end != path + 1)
+				*end++ = '/';
+			strcpy(end, name);
+			end += len;
+			stack[depth] = want;
+			if (want == 1)
+				stop_at = offset;
+			if (string_list_contains(inc_nodes, path))
+				want = 2;
+			else if (want)
+				want--;
+			else
+				stop_at = offset;
+			include = want;
+
+			break;
+
+		case FDT_END_NODE:
+			dt_struct = dt_struct_advance(&f, dt_struct, FDT_TAGSIZE);
+
+			include = want;
+			want = stack[depth--];
+			while (end > path && *--end != '/')
+				;
+			*end = '\0';
+
+			break;
+
+		case FDT_PROP:
+			fdt_prop = fit + dt_struct;
+			len = fdt32_to_cpu(fdt_prop->len);
+
+			name = dt_string(&f, dt_strings, fdt32_to_cpu(fdt_prop->nameoff));
+			if (!name)
+				return -ESPIPE;
+
+			dt_struct = dt_struct_advance(&f, dt_struct,
+					sizeof(struct fdt_property) + len);
+
+			include = want >= 2;
+			stop_at = offset;
+			if (string_list_contains(exc_props, name))
+				include = 0;
+
+			break;
+
+		case FDT_NOP:
+			dt_struct = dt_struct_advance(&f, dt_struct, FDT_TAGSIZE);
+
+			include = want >= 2;
+			stop_at = offset;
+
+			break;
+
+		case FDT_END:
+			dt_struct = dt_struct_advance(&f, dt_struct, FDT_TAGSIZE);
+
+			include = 1;
+
+			break;
+
+		default:
+			pr_err("%s: Unknown tag 0x%08X\n", __func__, tag);
+			return -EINVAL;
+		}
+
+		if (!dt_struct)
+			return -ESPIPE;
+
+		pr_debug("%s: include %d, want %d, offset 0x%x, len 0x%x\n",
+			path, include, want, offset, dt_struct-offset);
+
+		if (include && start == -1)
+			start = offset;
+
+		if (!include && start != -1) {
+			pr_debug("region: 0x%p+0x%x\n", fit+start, offset-start);
+			digest->update(digest, fit+start, offset-start);
+			start = -1;
+		}
+	} while (tag != FDT_END);
+
+	pr_debug("region: 0x%p+0x%x\n", fit+start, dt_struct-start);
+	digest->update(digest, fit+start, dt_struct-start);
+
+	pr_debug("strings: 0x%p+0x%x\n", dt_strings+hashed_strings_start, hashed_strings_size);
+	digest->update(digest, dt_strings+hashed_strings_start, hashed_strings_size);
+
+	return 0;
+}
+
+/*
+ * The consistency of the FTD structure was already checked by of_unflatten_dtb()
+ */
+static int fit_verify_signature(struct device_node *sig_node, void *fit)
+{
+	uint32_t hashed_strings_start, hashed_strings_size;
+	struct string_list inc_nodes, exc_props;
+	struct rsa_public_key key = {};
+	struct digest *digest;
+	int sig_len;
+	const char *algo_name, *key_name, *sig_value;
+	char *key_path;
+	struct device_node *key_node;
+	enum hash_algo algo;
+	void *hash;
+	int ret;
+
+	if (of_property_read_string(sig_node, "algo", &algo_name)) {
+		pr_err("algo not found\n");
+		ret = -EINVAL;
+		goto out;
+	}
+	if (strcmp(algo_name, "sha1,rsa2048") == 0) {
+		algo = HASH_ALGO_SHA1;
+	} else {
+		pr_err("unknown algo %s\n", algo_name);
+		ret = -EINVAL;
+		goto out;
+	}
+	digest = digest_get(algo);
+	if (!digest) {
+		pr_err("unsupported algo %s\n", algo_name);
+		ret = -EINVAL;
+		goto out;
+	}
+
+	sig_value = of_get_property(sig_node, "value", &sig_len);
+	if (!sig_value) {
+		pr_err("signature value not found\n");
+		ret = -EINVAL;
+		goto out;
+	}
+
+	if (of_property_read_string(sig_node, "key-name-hint", &key_name)) {
+		pr_err("key name not found\n");
+		ret = -EINVAL;
+		goto out;
+	}
+	key_path = asprintf("/signature/key-%s", key_name);
+	if (!key_name) {
+		ret = -ENOMEM;
+		goto out;
+	}
+	key_node = of_find_node_by_path(key_path);
+	free(key_path);
+	if (!key_node) {
+		pr_info("failed to find key node\n");
+		ret = -ENOENT;
+		goto out;
+	}
+
+	ret = rsa_of_read_key(key_node, &key);
+	if (ret) {
+		pr_info("failed to read key\n");
+		ret = -ENOENT;
+		goto out;
+	}
+
+	if (of_property_read_u32_index(sig_node, "hashed-strings", 0, &hashed_strings_start)) {
+		pr_err("%s: hashed-strings start not found\n", __func__);
+		ret = -EINVAL;
+		goto out;
+	}
+	if (of_property_read_u32_index(sig_node, "hashed-strings", 1, &hashed_strings_size)) {
+		pr_err("%s: hashed-strings size not found\n", __func__);
+		ret = -EINVAL;
+		goto out;
+	}
+
+	string_list_init(&inc_nodes);
+	string_list_init(&exc_props);
+
+	if (of_read_string_list(sig_node, "hashed-nodes", &inc_nodes))
+	{
+		pr_err("%s: hashed-nodes invalid\n", __func__);
+		ret = -EINVAL;
+		goto out_sl;
+	}
+
+	string_list_add(&exc_props, "data");
+
+	digest->init(digest);
+	ret = fit_digest(fit, digest, &inc_nodes, &exc_props, hashed_strings_start, hashed_strings_size);
+	hash = xzalloc(digest->length);
+	digest->final(digest, hash);
+
+	ret = rsa_verify(&key, sig_value, sig_len, hash, algo); 
+	if (ret) {
+		pr_info("sig BAD\n");
+		ret = CHECK_LEVEL_NONE;
+	} else {
+		pr_info("sig OK\n");
+		ret = CHECK_LEVEL_SIG;
+	}
+
+	free(hash);
+out_sl:
+	string_list_free(&inc_nodes);
+	string_list_free(&exc_props);
+out:
+	return ret;
+}
+
+static int fit_verify_hash(struct device_node *hash, const void *data, int data_len)
+{
+	struct digest *d;
+	const char *algo;
+	const char *value_read;
+	char *value_calc;
+	int hash_len;
+
+	value_read = of_get_property(hash, "value", &hash_len);
+	if (!value_read) {
+		pr_err("value not found\n");
+		return CHECK_LEVEL_NONE;
+	}
+
+	if (of_property_read_string(hash, "algo", &algo)) {
+		pr_err("algo not found\n");
+		return -EINVAL;
+	}
+
+	d = digest_get_by_name(algo);
+	if (!d) {
+		pr_err("unsupported algo %s\n", algo);
+		return -EINVAL;
+	}
+
+	if (hash_len != d->length) {
+		pr_err("invalid hash length %d\n", hash_len);
+		return -EINVAL;
+	}
+
+	value_calc = xmalloc(hash_len);
+	
+	d->init(d);
+	d->update(d, data, data_len);
+	d->final(d, value_calc);
+
+	if (memcmp(value_read, value_calc, hash_len)) {
+		pr_info("hash BAD\n");
+		return CHECK_LEVEL_NONE;
+	} else {
+		pr_info("hash OK\n");
+		return CHECK_LEVEL_HASH;
+	}
+}
+
+static int fit_open_image(struct fit_handle *handle, const char* unit)
+{
+	struct device_node *image = NULL, *hash;
+	const char *type = NULL, *desc;
+	const void *data;
+	int data_len;
+	int ret, level;
+
+	image = of_get_child_by_name(handle->root, "images");
+	if (!image)
+		return -ENOENT;
+
+	image = of_get_child_by_name(image, unit);
+	if (!image)
+		return -ENOENT;
+
+	if (of_property_read_string(image, "description", &desc)) {
+		pr_info("FIT image '%s' (no description)\n", unit);
+	} else {
+		pr_info("FIT image '%s': '%s'\n", unit, desc);
+	}
+
+	of_property_read_string(image, "type", &type);
+	if (!type)
+		return -EINVAL;
+
+	data = of_get_property(image, "data", &data_len);
+	if (!data) {
+		pr_err("data not found\n");
+		return -EINVAL;
+	}
+
+	level = CHECK_LEVEL_MAX;
+	for_each_child_of_node(image, hash) {
+		if (handle->verbose)
+			of_print_nodes(hash, 0);
+		ret = fit_verify_hash(hash, data, data_len);
+		if (ret < 0)
+			return ret;
+		level = min(level, ret);
+	}
+	if (level == CHECK_LEVEL_MAX) {
+		return -EINVAL;
+	}
+
+	if (level == CHECK_LEVEL_HASH) {
+		if (strcmp(type, "kernel") == 0 ||
+			strcmp(type, "kernel_noload") == 0) {
+			handle->kernel = data;
+			handle->kernel_size = data_len;
+		} else if (strcmp(type, "flat_dt") == 0) {
+			handle->oftree = data;
+			handle->oftree_size = data_len;
+		} else if (strcmp(type, "ramdisk") == 0) {
+			handle->initrd = data;
+			handle->initrd_size = data_len;
+		} else {
+			pr_info("unknown image type %s, ignoring\n", type);
+		}
+	}
+
+	return level;
+}
+
+static int fit_open_configuration(struct fit_handle *handle, int num)
+{
+	struct device_node *conf_node = NULL, *sig_node;
+	char unit_name[10];
+	const char *unit, *desc;
+	int ret, level;
+
+	conf_node = of_get_child_by_name(handle->root, "configurations");
+	if (!conf_node)
+		return -ENOENT;
+
+	if (num) {
+		snprintf(unit_name, sizeof(unit_name), "conf@%d", num);
+		unit = unit_name;
+	} else if (of_property_read_string(conf_node, "default", &unit)) {
+		unit = "conf@1";
+	}
+
+	conf_node = of_get_child_by_name(conf_node, unit);
+	if (!conf_node) {
+		pr_err("FIT configuration '%s' not found\n", unit);
+		return -ENOENT;
+	}
+
+	if (of_property_read_string(conf_node, "description", &desc)) {
+		pr_info("FIT configuration '%s' (no description)\n", unit);
+	} else {
+		pr_info("FIT configuration '%s': '%s'\n", unit, desc);
+	}
+
+	level = CHECK_LEVEL_MAX;
+	for_each_child_of_node(conf_node, sig_node) {
+		if (handle->verbose)
+			of_print_nodes(sig_node, 0);
+		ret = fit_verify_signature(sig_node, handle->fit);
+		if (ret < 0)
+			return ret;
+		level = min(level, ret);
+	}
+	if (level == CHECK_LEVEL_MAX)
+		return -EINVAL;
+
+	if (level != CHECK_LEVEL_SIG)
+		return -EINVAL;
+
+	if (of_property_read_string(conf_node, "kernel", &unit) == 0)
+		level = min(level, fit_open_image(handle, unit));
+	else
+		return -ENOENT;
+	
+	if (of_property_read_string(conf_node, "fdt", &unit) == 0)
+		level = min(level, fit_open_image(handle, unit));
+	
+	if (of_property_read_string(conf_node, "ramdisk", &unit) == 0)
+		level = min(level, fit_open_image(handle, unit));
+
+	if (level != CHECK_LEVEL_HASH)
+		return -EINVAL;
+
+	return 0;
+}
+
+struct fit_handle *fit_open(const char *filename, int num, bool verbose)
+{
+	struct fit_handle *handle = NULL;
+	const char *desc;
+
+	handle = xzalloc(sizeof(struct fit_handle));
+
+	handle->verbose = verbose;
+
+	handle->fit = read_file(filename, &handle->size);
+	if (!handle->fit) {
+		pr_err("unable to read %s: %s\n", filename, strerror(errno));
+		goto err;
+	}
+
+	handle->root = of_unflatten_dtb(handle->fit);
+	if (IS_ERR(handle->root)) {
+		goto err;
+	}
+
+	if (of_property_read_string(handle->root, "description", &desc)) {
+		pr_info("FIT '%s' (no description)\n", filename);
+	} else {
+		pr_info("FIT '%s': '%s'\n", filename, desc);
+	}
+
+	if (fit_open_configuration(handle, num))
+		goto err;
+
+	return handle;
+err:
+	if (handle->root)
+		of_delete_node(handle->root);
+	if (handle->fit)
+		free(handle->fit);
+	free(handle);
+
+	return NULL;
+}
+
+void fit_close(struct fit_handle *handle)
+{
+	if (handle->root)
+		of_delete_node(handle->root);
+	if (handle->fit)
+		free(handle->fit);
+	free(handle);
+}
+
+#ifdef CONFIG_SANDBOX
+static int do_bootm_sandbox_fit(struct image_data *data)
+{
+	struct fit_handle *handle;
+	handle = fit_open(data->os_file, data->os_num, data->verbose);
+	if (handle)
+		fit_close(handle);
+	return 0;
+}
+
+static struct image_handler sandbox_fit_handler = {
+	.name = "FIT image",
+	.bootm = do_bootm_sandbox_fit,
+	.filetype = filetype_oftree,
+};
+
+static int sandbox_fit_register(void)
+{
+	return register_image_handler(&sandbox_fit_handler);
+}
+late_initcall(sandbox_fit_register);
+#endif
+
diff --git a/include/image-fit.h b/include/image-fit.h
new file mode 100644
index 000000000000..bcbc859ead37
--- /dev/null
+++ b/include/image-fit.h
@@ -0,0 +1,42 @@
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ *
+ * Copyright (C) Jan Lübbe, 2014
+ */
+
+#ifndef __IMAGE_FIT_H__
+#define __IMAGE_FIT_H__
+
+#include <linux/types.h>
+
+struct fit_handle {
+	void *fit;
+	size_t size;
+
+	bool verbose;
+
+	struct device_node *root;
+
+	const void *kernel;
+	unsigned long kernel_size;
+	const void *oftree;
+	unsigned long oftree_size;
+	const void *initrd;
+	unsigned long initrd_size;
+};
+
+struct fit_handle *fit_open(const char *filename, int num, bool verbose);
+void fit_close(struct fit_handle *handle);
+
+#endif	/* __IMAGE_FIT_H__ */
-- 
2.1.4


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