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Diffstat (limited to 'tools/image-host.c')
| -rw-r--r-- | tools/image-host.c | 208 |
1 files changed, 208 insertions, 0 deletions
diff --git a/tools/image-host.c b/tools/image-host.c new file mode 100644 index 0000000..d944d0f --- /dev/null +++ b/tools/image-host.c @@ -0,0 +1,208 @@ +/* + * Copyright (c) 2013, Google Inc. + * + * (C) Copyright 2008 Semihalf + * + * (C) Copyright 2000-2006 + * Wolfgang Denk, DENX Software Engineering, wd@denx.de. + * + * See file CREDITS for list of people who contributed to this + * project. + * + * 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, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +#include "mkimage.h" +#include <bootstage.h> +#include <image.h> +#include <sha1.h> +#include <time.h> +#include <u-boot/crc.h> +#include <u-boot/md5.h> + +/** + * fit_set_hash_value - set hash value in requested has node + * @fit: pointer to the FIT format image header + * @noffset: hash node offset + * @value: hash value to be set + * @value_len: hash value length + * + * fit_set_hash_value() attempts to set hash value in a node at offset + * given and returns operation status to the caller. + * + * returns + * 0, on success + * -1, on failure + */ +static int fit_set_hash_value(void *fit, int noffset, uint8_t *value, + int value_len) +{ + int ret; + + ret = fdt_setprop(fit, noffset, FIT_VALUE_PROP, value, value_len); + if (ret) { + printf("Can't set hash '%s' property for '%s' node(%s)\n", + FIT_VALUE_PROP, fit_get_name(fit, noffset, NULL), + fdt_strerror(ret)); + return -1; + } + + return 0; +} + +/** + * fit_image_process_hash - Process a single subnode of the images/ node + * + * Check each subnode and process accordingly. For hash nodes we generate + * a hash of the supplised data and store it in the node. + * + * @fit: pointer to the FIT format image header + * @image_name: name of image being processes (used to display errors) + * @noffset: subnode offset + * @data: data to process + * @size: size of data in bytes + * @return 0 if ok, -1 on error + */ +static int fit_image_process_hash(void *fit, const char *image_name, + int noffset, const void *data, size_t size) +{ + uint8_t value[FIT_MAX_HASH_LEN]; + const char *node_name; + int value_len; + char *algo; + + node_name = fit_get_name(fit, noffset, NULL); + + if (fit_image_hash_get_algo(fit, noffset, &algo)) { + printf("Can't get hash algo property for '%s' hash node in '%s' image node\n", + node_name, image_name); + return -1; + } + + if (calculate_hash(data, size, algo, value, &value_len)) { + printf("Unsupported hash algorithm (%s) for '%s' hash node in '%s' image node\n", + algo, node_name, image_name); + return -1; + } + + if (fit_set_hash_value(fit, noffset, value, value_len)) { + printf("Can't set hash value for '%s' hash node in '%s' image node\n", + node_name, image_name); + return -1; + } + + return 0; +} + +/** + * fit_image_add_verification_data() - calculate/set hash data for image node + * + * This adds hash values for a component image node. + * + * All existing hash subnodes are checked, if algorithm property is set to + * one of the supported hash algorithms, hash value is computed and + * corresponding hash node property is set, for example: + * + * Input component image node structure: + * + * o image@1 (at image_noffset) + * | - data = [binary data] + * o hash@1 + * |- algo = "sha1" + * + * Output component image node structure: + * + * o image@1 (at image_noffset) + * | - data = [binary data] + * o hash@1 + * |- algo = "sha1" + * |- value = sha1(data) + * + * For signature details, please see doc/uImage.FIT/signature.txt + * + * @fit: Pointer to the FIT format image header + * @image_noffset: Requested component image node + * @return: 0 on success, <0 on failure + */ +int fit_image_add_verification_data(void *fit, int image_noffset) +{ + const char *image_name; + const void *data; + size_t size; + int noffset; + + /* Get image data and data length */ + if (fit_image_get_data(fit, image_noffset, &data, &size)) { + printf("Can't get image data/size\n"); + return -1; + } + + image_name = fit_get_name(fit, image_noffset, NULL); + + /* Process all hash subnodes of the component image node */ + for (noffset = fdt_first_subnode(fit, image_noffset); + noffset >= 0; + noffset = fdt_next_subnode(fit, noffset)) { + const char *node_name; + int ret = 0; + + /* + * Check subnode name, must be equal to "hash" or "signature". + * Multiple hash nodes require unique unit node + * names, e.g. hash@1, hash@2, signature@1, etc. + */ + node_name = fit_get_name(fit, noffset, NULL); + if (!strncmp(node_name, FIT_HASH_NODENAME, + strlen(FIT_HASH_NODENAME))) { + ret = fit_image_process_hash(fit, image_name, noffset, + data, size); + } + if (ret) + return -1; + } + + return 0; +} + +int fit_add_verification_data(void *fit) +{ + int images_noffset; + int noffset; + int ret; + + /* Find images parent node offset */ + images_noffset = fdt_path_offset(fit, FIT_IMAGES_PATH); + if (images_noffset < 0) { + printf("Can't find images parent node '%s' (%s)\n", + FIT_IMAGES_PATH, fdt_strerror(images_noffset)); + return images_noffset; + } + + /* Process its subnodes, print out component images details */ + for (noffset = fdt_first_subnode(fit, images_noffset); + noffset >= 0; + noffset = fdt_next_subnode(fit, noffset)) { + /* + * Direct child node of the images parent node, + * i.e. component image node. + */ + ret = fit_image_add_verification_data(fit, noffset); + if (ret) + return ret; + } + + return 0; +} |