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Tom Rini83d290c2018-05-06 17:58:06 -04001// SPDX-License-Identifier: GPL-2.0+
Marek Vasutb401b732014-03-05 19:58:39 +01002/*
3 * Copyright (C) 2014 Marek Vasut <marex@denx.de>
4 *
Philippe Reynes8302d172020-01-06 15:22:35 +01005 * Command for en/de-crypting block of memory with AES-[128/192/256]-CBC cipher.
Marek Vasutb401b732014-03-05 19:58:39 +01006 */
7
8#include <common.h>
9#include <command.h>
Stefano Babicb80c0b92017-04-05 18:08:00 +020010#include <uboot_aes.h>
Marek Vasutb401b732014-03-05 19:58:39 +010011#include <malloc.h>
12#include <asm/byteorder.h>
13#include <linux/compiler.h>
Philippe Reynesed7ea052019-09-24 11:32:29 +020014#include <mapmem.h>
Marek Vasutb401b732014-03-05 19:58:39 +010015
Philippe Reynes8302d172020-01-06 15:22:35 +010016u32 aes_get_key_len(char *command)
17{
18 u32 key_len = AES128_KEY_LENGTH;
19
20 if (!strcmp(command, "aes.192"))
21 key_len = AES192_KEY_LENGTH;
22 else if (!strcmp(command, "aes.256"))
23 key_len = AES256_KEY_LENGTH;
24
25 return key_len;
26}
27
Marek Vasutb401b732014-03-05 19:58:39 +010028/**
29 * do_aes() - Handle the "aes" command-line command
30 * @cmdtp: Command data struct pointer
31 * @flag: Command flag
32 * @argc: Command-line argument count
33 * @argv: Array of command-line arguments
34 *
35 * Returns zero on success, CMD_RET_USAGE in case of misuse and negative
36 * on error.
37 */
38static int do_aes(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
39{
Андрей Мозжухинaf09eba2018-01-03 15:43:56 +030040 uint32_t key_addr, iv_addr, src_addr, dst_addr, len;
41 uint8_t *key_ptr, *iv_ptr, *src_ptr, *dst_ptr;
Philippe Reynes8302d172020-01-06 15:22:35 +010042 u8 key_exp[AES256_EXPAND_KEY_LENGTH];
43 u32 aes_blocks, key_len;
Marek Vasutb401b732014-03-05 19:58:39 +010044 int enc;
45
Андрей Мозжухинaf09eba2018-01-03 15:43:56 +030046 if (argc != 7)
Marek Vasutb401b732014-03-05 19:58:39 +010047 return CMD_RET_USAGE;
48
Philippe Reynes8302d172020-01-06 15:22:35 +010049 key_len = aes_get_key_len(argv[0]);
50
Marek Vasutb401b732014-03-05 19:58:39 +010051 if (!strncmp(argv[1], "enc", 3))
52 enc = 1;
53 else if (!strncmp(argv[1], "dec", 3))
54 enc = 0;
55 else
56 return CMD_RET_USAGE;
57
58 key_addr = simple_strtoul(argv[2], NULL, 16);
Андрей Мозжухинaf09eba2018-01-03 15:43:56 +030059 iv_addr = simple_strtoul(argv[3], NULL, 16);
60 src_addr = simple_strtoul(argv[4], NULL, 16);
61 dst_addr = simple_strtoul(argv[5], NULL, 16);
62 len = simple_strtoul(argv[6], NULL, 16);
Marek Vasutb401b732014-03-05 19:58:39 +010063
Philippe Reynes8302d172020-01-06 15:22:35 +010064 key_ptr = (uint8_t *)map_sysmem(key_addr, key_len);
Philippe Reynesed7ea052019-09-24 11:32:29 +020065 iv_ptr = (uint8_t *)map_sysmem(iv_addr, 128 / 8);
66 src_ptr = (uint8_t *)map_sysmem(src_addr, len);
67 dst_ptr = (uint8_t *)map_sysmem(dst_addr, len);
Marek Vasutb401b732014-03-05 19:58:39 +010068
69 /* First we expand the key. */
Philippe Reynes8302d172020-01-06 15:22:35 +010070 aes_expand_key(key_ptr, key_len, key_exp);
Marek Vasutb401b732014-03-05 19:58:39 +010071
72 /* Calculate the number of AES blocks to encrypt. */
Philippe Reynes7012c042020-01-06 15:22:34 +010073 aes_blocks = DIV_ROUND_UP(len, AES_BLOCK_LENGTH);
Marek Vasutb401b732014-03-05 19:58:39 +010074
75 if (enc)
Philippe Reynes8302d172020-01-06 15:22:35 +010076 aes_cbc_encrypt_blocks(key_len, key_exp, iv_ptr, src_ptr,
77 dst_ptr, aes_blocks);
Marek Vasutb401b732014-03-05 19:58:39 +010078 else
Philippe Reynes8302d172020-01-06 15:22:35 +010079 aes_cbc_decrypt_blocks(key_len, key_exp, iv_ptr, src_ptr,
80 dst_ptr, aes_blocks);
Marek Vasutb401b732014-03-05 19:58:39 +010081
Philippe Reynesed7ea052019-09-24 11:32:29 +020082 unmap_sysmem(key_ptr);
83 unmap_sysmem(iv_ptr);
84 unmap_sysmem(src_ptr);
85 unmap_sysmem(dst_ptr);
86
Marek Vasutb401b732014-03-05 19:58:39 +010087 return 0;
88}
89
90/***************************************************/
91#ifdef CONFIG_SYS_LONGHELP
92static char aes_help_text[] =
Philippe Reynes8302d172020-01-06 15:22:35 +010093 "[.128,.192,.256] enc key iv src dst len - Encrypt block of data $len bytes long\n"
Андрей Мозжухинaf09eba2018-01-03 15:43:56 +030094 " at address $src using a key at address\n"
95 " $key with initialization vector at address\n"
96 " $iv. Store the result at address $dst.\n"
97 " The $len size must be multiple of 16 bytes.\n"
98 " The $key and $iv must be 16 bytes long.\n"
Philippe Reynes8302d172020-01-06 15:22:35 +010099 "aes [.128,.192,.256] dec key iv src dst len - Decrypt block of data $len bytes long\n"
Андрей Мозжухинaf09eba2018-01-03 15:43:56 +0300100 " at address $src using a key at address\n"
101 " $key with initialization vector at address\n"
102 " $iv. Store the result at address $dst.\n"
103 " The $len size must be multiple of 16 bytes.\n"
104 " The $key and $iv must be 16 bytes long.";
Marek Vasutb401b732014-03-05 19:58:39 +0100105#endif
106
107U_BOOT_CMD(
Андрей Мозжухинaf09eba2018-01-03 15:43:56 +0300108 aes, 7, 1, do_aes,
Philippe Reynes8302d172020-01-06 15:22:35 +0100109 "AES 128/192/256 CBC encryption",
Marek Vasutb401b732014-03-05 19:58:39 +0100110 aes_help_text
111);