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