1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun * Copyright (C) 2014 Marek Vasut <marex@denx.de>
3*4882a593Smuzhiyun *
4*4882a593Smuzhiyun * Command for en/de-crypting block of memory with AES-128-CBC cipher.
5*4882a593Smuzhiyun *
6*4882a593Smuzhiyun * SPDX-License-Identifier: GPL-2.0+
7*4882a593Smuzhiyun */
8*4882a593Smuzhiyun
9*4882a593Smuzhiyun #include <common.h>
10*4882a593Smuzhiyun #include <command.h>
11*4882a593Smuzhiyun #include <environment.h>
12*4882a593Smuzhiyun #include <uboot_aes.h>
13*4882a593Smuzhiyun #include <malloc.h>
14*4882a593Smuzhiyun #include <asm/byteorder.h>
15*4882a593Smuzhiyun #include <linux/compiler.h>
16*4882a593Smuzhiyun
17*4882a593Smuzhiyun DECLARE_GLOBAL_DATA_PTR;
18*4882a593Smuzhiyun
19*4882a593Smuzhiyun /**
20*4882a593Smuzhiyun * do_aes() - Handle the "aes" command-line command
21*4882a593Smuzhiyun * @cmdtp: Command data struct pointer
22*4882a593Smuzhiyun * @flag: Command flag
23*4882a593Smuzhiyun * @argc: Command-line argument count
24*4882a593Smuzhiyun * @argv: Array of command-line arguments
25*4882a593Smuzhiyun *
26*4882a593Smuzhiyun * Returns zero on success, CMD_RET_USAGE in case of misuse and negative
27*4882a593Smuzhiyun * on error.
28*4882a593Smuzhiyun */
do_aes(cmd_tbl_t * cmdtp,int flag,int argc,char * const argv[])29*4882a593Smuzhiyun static int do_aes(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
30*4882a593Smuzhiyun {
31*4882a593Smuzhiyun uint32_t key_addr, src_addr, dst_addr, len;
32*4882a593Smuzhiyun uint8_t *key_ptr, *src_ptr, *dst_ptr;
33*4882a593Smuzhiyun uint8_t key_exp[AES_EXPAND_KEY_LENGTH];
34*4882a593Smuzhiyun uint32_t aes_blocks;
35*4882a593Smuzhiyun int enc;
36*4882a593Smuzhiyun
37*4882a593Smuzhiyun if (argc != 6)
38*4882a593Smuzhiyun return CMD_RET_USAGE;
39*4882a593Smuzhiyun
40*4882a593Smuzhiyun if (!strncmp(argv[1], "enc", 3))
41*4882a593Smuzhiyun enc = 1;
42*4882a593Smuzhiyun else if (!strncmp(argv[1], "dec", 3))
43*4882a593Smuzhiyun enc = 0;
44*4882a593Smuzhiyun else
45*4882a593Smuzhiyun return CMD_RET_USAGE;
46*4882a593Smuzhiyun
47*4882a593Smuzhiyun key_addr = simple_strtoul(argv[2], NULL, 16);
48*4882a593Smuzhiyun src_addr = simple_strtoul(argv[3], NULL, 16);
49*4882a593Smuzhiyun dst_addr = simple_strtoul(argv[4], NULL, 16);
50*4882a593Smuzhiyun len = simple_strtoul(argv[5], NULL, 16);
51*4882a593Smuzhiyun
52*4882a593Smuzhiyun key_ptr = (uint8_t *)key_addr;
53*4882a593Smuzhiyun src_ptr = (uint8_t *)src_addr;
54*4882a593Smuzhiyun dst_ptr = (uint8_t *)dst_addr;
55*4882a593Smuzhiyun
56*4882a593Smuzhiyun /* First we expand the key. */
57*4882a593Smuzhiyun aes_expand_key(key_ptr, key_exp);
58*4882a593Smuzhiyun
59*4882a593Smuzhiyun /* Calculate the number of AES blocks to encrypt. */
60*4882a593Smuzhiyun aes_blocks = DIV_ROUND_UP(len, AES_KEY_LENGTH);
61*4882a593Smuzhiyun
62*4882a593Smuzhiyun if (enc)
63*4882a593Smuzhiyun aes_cbc_encrypt_blocks(key_exp, src_ptr, dst_ptr, aes_blocks);
64*4882a593Smuzhiyun else
65*4882a593Smuzhiyun aes_cbc_decrypt_blocks(key_exp, src_ptr, dst_ptr, aes_blocks);
66*4882a593Smuzhiyun
67*4882a593Smuzhiyun return 0;
68*4882a593Smuzhiyun }
69*4882a593Smuzhiyun
70*4882a593Smuzhiyun /***************************************************/
71*4882a593Smuzhiyun #ifdef CONFIG_SYS_LONGHELP
72*4882a593Smuzhiyun static char aes_help_text[] =
73*4882a593Smuzhiyun "enc key src dst len - Encrypt block of data $len bytes long\n"
74*4882a593Smuzhiyun " at address $src using a key at address\n"
75*4882a593Smuzhiyun " $key and store the result at address\n"
76*4882a593Smuzhiyun " $dst. The $len size must be multiple of\n"
77*4882a593Smuzhiyun " 16 bytes and $key must be 16 bytes long.\n"
78*4882a593Smuzhiyun "aes dec key src dst len - Decrypt block of data $len bytes long\n"
79*4882a593Smuzhiyun " at address $src using a key at address\n"
80*4882a593Smuzhiyun " $key and store the result at address\n"
81*4882a593Smuzhiyun " $dst. The $len size must be multiple of\n"
82*4882a593Smuzhiyun " 16 bytes and $key must be 16 bytes long.";
83*4882a593Smuzhiyun #endif
84*4882a593Smuzhiyun
85*4882a593Smuzhiyun U_BOOT_CMD(
86*4882a593Smuzhiyun aes, 6, 1, do_aes,
87*4882a593Smuzhiyun "AES 128 CBC encryption",
88*4882a593Smuzhiyun aes_help_text
89*4882a593Smuzhiyun );
90