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git.ipfire.org Git - thirdparty/u-boot.git/blob - cmd/aes.c
1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (C) 2014 Marek Vasut <marex@denx.de>
5 * Command for en/de-crypting block of memory with AES-128-CBC cipher.
10 #include <environment.h>
11 #include <uboot_aes.h>
13 #include <asm/byteorder.h>
14 #include <linux/compiler.h>
17 * do_aes() - Handle the "aes" command-line command
18 * @cmdtp: Command data struct pointer
20 * @argc: Command-line argument count
21 * @argv: Array of command-line arguments
23 * Returns zero on success, CMD_RET_USAGE in case of misuse and negative
26 static int do_aes(cmd_tbl_t
*cmdtp
, int flag
, int argc
, char *const argv
[])
28 uint32_t key_addr
, iv_addr
, src_addr
, dst_addr
, len
;
29 uint8_t *key_ptr
, *iv_ptr
, *src_ptr
, *dst_ptr
;
30 uint8_t key_exp
[AES_EXPAND_KEY_LENGTH
];
37 if (!strncmp(argv
[1], "enc", 3))
39 else if (!strncmp(argv
[1], "dec", 3))
44 key_addr
= simple_strtoul(argv
[2], NULL
, 16);
45 iv_addr
= simple_strtoul(argv
[3], NULL
, 16);
46 src_addr
= simple_strtoul(argv
[4], NULL
, 16);
47 dst_addr
= simple_strtoul(argv
[5], NULL
, 16);
48 len
= simple_strtoul(argv
[6], NULL
, 16);
50 key_ptr
= (uint8_t *)key_addr
;
51 iv_ptr
= (uint8_t *)iv_addr
;
52 src_ptr
= (uint8_t *)src_addr
;
53 dst_ptr
= (uint8_t *)dst_addr
;
55 /* First we expand the key. */
56 aes_expand_key(key_ptr
, key_exp
);
58 /* Calculate the number of AES blocks to encrypt. */
59 aes_blocks
= DIV_ROUND_UP(len
, AES_KEY_LENGTH
);
62 aes_cbc_encrypt_blocks(key_exp
, iv_ptr
, src_ptr
, dst_ptr
,
65 aes_cbc_decrypt_blocks(key_exp
, iv_ptr
, src_ptr
, dst_ptr
,
71 /***************************************************/
72 #ifdef CONFIG_SYS_LONGHELP
73 static char aes_help_text
[] =
74 "enc key iv src dst len - Encrypt block of data $len bytes long\n"
75 " at address $src using a key at address\n"
76 " $key with initialization vector at address\n"
77 " $iv. Store the result at address $dst.\n"
78 " The $len size must be multiple of 16 bytes.\n"
79 " The $key and $iv must be 16 bytes long.\n"
80 "aes dec key iv src dst len - Decrypt block of data $len bytes long\n"
81 " at address $src using a key at address\n"
82 " $key with initialization vector at address\n"
83 " $iv. Store the result at address $dst.\n"
84 " The $len size must be multiple of 16 bytes.\n"
85 " The $key and $iv must be 16 bytes long.";
90 "AES 128 CBC encryption",