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- // 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;
- }
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