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1 /*
2 * Copyright (C) 2014 Marek Vasut <marex@denx.de>
3 *
4 * Command for en/de-crypting block of memory with AES-128-CBC cipher.
5 *
6 * SPDX-License-Identifier: GPL-2.0+
7 */
8
9 #include <common.h>
10 #include <command.h>
11 #include <environment.h>
12 #include <aes.h>
13 #include <malloc.h>
14 #include <asm/byteorder.h>
15 #include <linux/compiler.h>
16
17 DECLARE_GLOBAL_DATA_PTR;
18
19 /**
20 * do_aes() - Handle the "aes" command-line command
21 * @cmdtp: Command data struct pointer
22 * @flag: Command flag
23 * @argc: Command-line argument count
24 * @argv: Array of command-line arguments
25 *
26 * Returns zero on success, CMD_RET_USAGE in case of misuse and negative
27 * on error.
28 */
29 static int do_aes(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
30 {
31 uint32_t key_addr, src_addr, dst_addr, len;
32 uint8_t *key_ptr, *src_ptr, *dst_ptr;
33 uint8_t key_exp[AES_EXPAND_KEY_LENGTH];
34 uint32_t aes_blocks;
35 int enc;
36
37 if (argc != 6)
38 return CMD_RET_USAGE;
39
40 if (!strncmp(argv[1], "enc", 3))
41 enc = 1;
42 else if (!strncmp(argv[1], "dec", 3))
43 enc = 0;
44 else
45 return CMD_RET_USAGE;
46
47 key_addr = simple_strtoul(argv[2], NULL, 16);
48 src_addr = simple_strtoul(argv[3], NULL, 16);
49 dst_addr = simple_strtoul(argv[4], NULL, 16);
50 len = simple_strtoul(argv[5], NULL, 16);
51
52 key_ptr = (uint8_t *)key_addr;
53 src_ptr = (uint8_t *)src_addr;
54 dst_ptr = (uint8_t *)dst_addr;
55
56 /* First we expand the key. */
57 aes_expand_key(key_ptr, key_exp);
58
59 /* Calculate the number of AES blocks to encrypt. */
60 aes_blocks = DIV_ROUND_UP(len, AES_KEY_LENGTH);
61
62 if (enc)
63 aes_cbc_encrypt_blocks(key_exp, src_ptr, dst_ptr, aes_blocks);
64 else
65 aes_cbc_decrypt_blocks(key_exp, src_ptr, dst_ptr, aes_blocks);
66
67 return 0;
68 }
69
70 /***************************************************/
71 #ifdef CONFIG_SYS_LONGHELP
72 static char aes_help_text[] =
73 "enc key src dst len - Encrypt block of data $len bytes long\n"
74 " at address $src using a key at address\n"
75 " $key and store the result at address\n"
76 " $dst. The $len size must be multiple of\n"
77 " 16 bytes and $key must be 16 bytes long.\n"
78 "aes dec key src dst len - Decrypt block of data $len bytes long\n"
79 " at address $src using a key at address\n"
80 " $key and store the result at address\n"
81 " $dst. The $len size must be multiple of\n"
82 " 16 bytes and $key must be 16 bytes long.";
83 #endif
84
85 U_BOOT_CMD(
86 aes, 6, 1, do_aes,
87 "AES 128 CBC encryption",
88 aes_help_text
89 );