aboutsummaryrefslogtreecommitdiff
path: root/common
diff options
context:
space:
mode:
Diffstat (limited to 'common')
-rw-r--r--common/Makefile1
-rw-r--r--common/image-cipher.c167
-rw-r--r--common/image-fit.c90
3 files changed, 258 insertions, 0 deletions
diff --git a/common/Makefile b/common/Makefile
index 029cc0f2ce..5f62b8d0b1 100644
--- a/common/Makefile
+++ b/common/Makefile
@@ -113,6 +113,7 @@ 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_TPL_)FIT_CIPHER) += image-cipher.o
obj-$(CONFIG_IO_TRACE) += iotrace.o
obj-y += memsize.o
obj-y += stdio.o
diff --git a/common/image-cipher.c b/common/image-cipher.c
new file mode 100644
index 0000000000..cee3b03ee5
--- /dev/null
+++ b/common/image-cipher.c
@@ -0,0 +1,167 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (c) 2019, Softathome
+ */
+
+#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 <uboot_aes.h>
+#include <u-boot/aes.h>
+
+struct cipher_algo cipher_algos[] = {
+ {
+ .name = "aes128",
+ .key_len = AES128_KEY_LENGTH,
+ .iv_len = AES_BLOCK_LENGTH,
+#if IMAGE_ENABLE_ENCRYPT
+ .calculate_type = EVP_aes_128_cbc,
+#endif
+ .encrypt = image_aes_encrypt,
+ .decrypt = image_aes_decrypt,
+ .add_cipher_data = image_aes_add_cipher_data
+ },
+ {
+ .name = "aes192",
+ .key_len = AES192_KEY_LENGTH,
+ .iv_len = AES_BLOCK_LENGTH,
+#if IMAGE_ENABLE_ENCRYPT
+ .calculate_type = EVP_aes_192_cbc,
+#endif
+ .encrypt = image_aes_encrypt,
+ .decrypt = image_aes_decrypt,
+ .add_cipher_data = image_aes_add_cipher_data
+ },
+ {
+ .name = "aes256",
+ .key_len = AES256_KEY_LENGTH,
+ .iv_len = AES_BLOCK_LENGTH,
+#if IMAGE_ENABLE_ENCRYPT
+ .calculate_type = EVP_aes_256_cbc,
+#endif
+ .encrypt = image_aes_encrypt,
+ .decrypt = image_aes_decrypt,
+ .add_cipher_data = image_aes_add_cipher_data
+ }
+};
+
+struct cipher_algo *image_get_cipher_algo(const char *full_name)
+{
+ int i;
+ const char *name;
+
+ for (i = 0; i < ARRAY_SIZE(cipher_algos); i++) {
+ name = cipher_algos[i].name;
+ if (!strncmp(name, full_name, strlen(name)))
+ return &cipher_algos[i];
+ }
+
+ return NULL;
+}
+
+static int fit_image_setup_decrypt(struct image_cipher_info *info,
+ const void *fit, int image_noffset,
+ int cipher_noffset)
+{
+ const void *fdt = gd_fdt_blob();
+ const char *node_name;
+ char node_path[128];
+ int noffset;
+ char *algo_name;
+ int ret;
+
+ node_name = fit_get_name(fit, image_noffset, NULL);
+ if (!node_name) {
+ printf("Can't get node name\n");
+ return -1;
+ }
+
+ if (fit_image_cipher_get_algo(fit, cipher_noffset, &algo_name)) {
+ printf("Can't get algo name for cipher '%s' in image '%s'\n",
+ node_name, node_name);
+ return -1;
+ }
+
+ info->keyname = fdt_getprop(fit, cipher_noffset, "key-name-hint", NULL);
+ if (!info->keyname) {
+ printf("Can't get key name\n");
+ return -1;
+ }
+
+ info->ivname = fdt_getprop(fit, cipher_noffset, "iv-name-hint", NULL);
+ if (!info->ivname) {
+ printf("Can't get IV name\n");
+ return -1;
+ }
+
+ info->fit = fit;
+ info->node_noffset = image_noffset;
+ info->name = algo_name;
+ info->cipher = image_get_cipher_algo(algo_name);
+ if (!info->cipher) {
+ printf("Can't get cipher\n");
+ return -1;
+ }
+
+ ret = fit_image_get_data_size_unciphered(fit, image_noffset,
+ &info->size_unciphered);
+ if (ret) {
+ printf("Can't get size of unciphered data\n");
+ return -1;
+ }
+
+ /*
+ * Search the cipher node in the u-boot fdt
+ * the path should be: /cipher/key-<algo>-<key>-<iv>
+ */
+ snprintf(node_path, sizeof(node_path), "/%s/key-%s-%s-%s",
+ FIT_CIPHER_NODENAME, algo_name, info->keyname, info->ivname);
+
+ noffset = fdt_path_offset(fdt, node_path);
+ if (noffset < 0) {
+ printf("Can't found cipher node offset\n");
+ return -1;
+ }
+
+ /* read key */
+ info->key = fdt_getprop(fdt, noffset, "key", NULL);
+ if (!info->key) {
+ printf("Can't get key in cipher node '%s'\n", node_path);
+ return -1;
+ }
+
+ /* read iv */
+ info->iv = fdt_getprop(fdt, noffset, "iv", NULL);
+ if (!info->iv) {
+ printf("Can't get IV in cipher node '%s'\n", node_path);
+ return -1;
+ }
+
+ return 0;
+}
+
+int fit_image_decrypt_data(const void *fit,
+ int image_noffset, int cipher_noffset,
+ const void *data_ciphered, size_t size_ciphered,
+ void **data_unciphered, size_t *size_unciphered)
+{
+ struct image_cipher_info info;
+ int ret;
+
+ ret = fit_image_setup_decrypt(&info, fit, image_noffset,
+ cipher_noffset);
+ if (ret < 0)
+ goto out;
+
+ ret = info.cipher->decrypt(&info, data_ciphered, size_ciphered,
+ data_unciphered, size_unciphered);
+
+ out:
+ return ret;
+}
diff --git a/common/image-fit.c b/common/image-fit.c
index 231612ff5f..f3bb00c98a 100644
--- a/common/image-fit.c
+++ b/common/image-fit.c
@@ -948,6 +948,31 @@ int fit_image_get_data_size(const void *fit, int noffset, int *data_size)
}
/**
+ * Get 'data-size-unciphered' property from a given image node.
+ *
+ * @fit: pointer to the FIT image header
+ * @noffset: component image node offset
+ * @data_size: holds the data-size property
+ *
+ * returns:
+ * 0, on success
+ * -ENOENT if the property could not be found
+ */
+int fit_image_get_data_size_unciphered(const void *fit, int noffset,
+ size_t *data_size)
+{
+ const fdt32_t *val;
+
+ val = fdt_getprop(fit, noffset, "data-size-unciphered", NULL);
+ if (!val)
+ return -ENOENT;
+
+ *data_size = (size_t)fdt32_to_cpu(*val);
+
+ return 0;
+}
+
+/**
* fit_image_get_data_and_size - get data and its size including
* both embedded and external data
* @fit: pointer to the FIT format image header
@@ -1080,6 +1105,33 @@ static int fit_image_hash_get_ignore(const void *fit, int noffset, int *ignore)
return 0;
}
+/**
+ * fit_image_cipher_get_algo - get cipher algorithm name
+ * @fit: pointer to the FIT format image header
+ * @noffset: cipher node offset
+ * @algo: double pointer to char, will hold pointer to the algorithm name
+ *
+ * fit_image_cipher_get_algo() finds cipher algorithm property in a given
+ * cipher node. If the property is found its data start address is returned
+ * to the caller.
+ *
+ * returns:
+ * 0, on success
+ * -1, on failure
+ */
+int fit_image_cipher_get_algo(const void *fit, int noffset, char **algo)
+{
+ int len;
+
+ *algo = (char *)fdt_getprop(fit, noffset, FIT_ALGO_PROP, &len);
+ if (!*algo) {
+ fit_get_debug(fit, noffset, FIT_ALGO_PROP, len);
+ return -1;
+ }
+
+ return 0;
+}
+
ulong fit_get_end(const void *fit)
{
return map_to_sysmem((void *)(fit + fdt_totalsize(fit)));
@@ -1354,6 +1406,32 @@ int fit_all_image_verify(const void *fit)
return 1;
}
+#ifdef CONFIG_FIT_CIPHER
+static int fit_image_uncipher(const void *fit, int image_noffset,
+ void **data, size_t *size)
+{
+ int cipher_noffset, ret;
+ void *dst;
+ size_t size_dst;
+
+ cipher_noffset = fdt_subnode_offset(fit, image_noffset,
+ FIT_CIPHER_NODENAME);
+ if (cipher_noffset < 0)
+ return 0;
+
+ ret = fit_image_decrypt_data(fit, image_noffset, cipher_noffset,
+ *data, *size, &dst, &size_dst);
+ if (ret)
+ goto out;
+
+ *data = dst;
+ *size = size_dst;
+
+ out:
+ return ret;
+}
+#endif /* CONFIG_FIT_CIPHER */
+
/**
* fit_image_check_os - check whether image node is of a given os type
* @fit: pointer to the FIT format image header
@@ -1954,6 +2032,18 @@ int fit_image_load(bootm_headers_t *images, ulong addr,
return -ENOENT;
}
+#ifdef CONFIG_FIT_CIPHER
+ /* Decrypt data before uncompress/move */
+ if (IMAGE_ENABLE_DECRYPT) {
+ puts(" Decrypting Data ... ");
+ if (fit_image_uncipher(fit, noffset, &buf, &size)) {
+ puts("Error\n");
+ return -EACCES;
+ }
+ puts("OK\n");
+ }
+#endif
+
#if !defined(USE_HOSTCC) && defined(CONFIG_FIT_IMAGE_POST_PROCESS)
/* perform any post-processing on the image data */
board_fit_image_post_process(&buf, &size);