mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-29 22:43:10 +00:00
4df3578119
This commit add to u-boot the support to decrypt fit image encrypted with aes. The FIT image contains the key name and the IV name. Then u-boot look for the key and IV in his device tree and decrypt images before moving to the next stage. Signed-off-by: Philippe Reynes <philippe.reynes@softathome.com>
41 lines
965 B
C
41 lines
965 B
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Copyright (c) 2019, softathome
|
|
*/
|
|
|
|
#ifndef USE_HOSTCC
|
|
#include <common.h>
|
|
#include <malloc.h>
|
|
#endif
|
|
#include <image.h>
|
|
#include <uboot_aes.h>
|
|
|
|
int image_aes_decrypt(struct image_cipher_info *info,
|
|
const void *cipher, size_t cipher_len,
|
|
void **data, size_t *size)
|
|
{
|
|
#ifndef USE_HOSTCC
|
|
unsigned char key_exp[AES256_EXPAND_KEY_LENGTH];
|
|
unsigned int aes_blocks, key_len = info->cipher->key_len;
|
|
|
|
*data = malloc(cipher_len);
|
|
if (!*data) {
|
|
printf("Can't allocate memory to decrypt\n");
|
|
return -ENOMEM;
|
|
}
|
|
*size = info->size_unciphered;
|
|
|
|
memcpy(&key_exp[0], info->key, key_len);
|
|
|
|
/* First we expand the key. */
|
|
aes_expand_key((u8 *)info->key, key_len, key_exp);
|
|
|
|
/* Calculate the number of AES blocks to encrypt. */
|
|
aes_blocks = DIV_ROUND_UP(cipher_len, AES_BLOCK_LENGTH);
|
|
|
|
aes_cbc_decrypt_blocks(key_len, key_exp, (u8 *)info->iv,
|
|
(u8 *)cipher, *data, aes_blocks);
|
|
#endif
|
|
|
|
return 0;
|
|
}
|