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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2014 Marek Vasut <marex@denx.de>
*
* Command for en/de-crypting block of memory with AES-[128/192/256]-CBC cipher.
*/
#include <common.h>
#include <command.h>
#include <uboot_aes.h>
#include <malloc.h>
#include <asm/byteorder.h>
#include <linux/compiler.h>
#include <mapmem.h>
u32 aes_get_key_len(char *command)
{
u32 key_len = AES128_KEY_LENGTH;
if (!strcmp(command, "aes.192"))
key_len = AES192_KEY_LENGTH;
else if (!strcmp(command, "aes.256"))
key_len = AES256_KEY_LENGTH;
return key_len;
}
/**
* do_aes() - Handle the "aes" command-line command
* @cmdtp: Command data struct pointer
* @flag: Command flag
* @argc: Command-line argument count
* @argv: Array of command-line arguments
*
* Returns zero on success, CMD_RET_USAGE in case of misuse and negative
* on error.
*/
static int do_aes(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
{
uint32_t key_addr, iv_addr, src_addr, dst_addr, len;
uint8_t *key_ptr, *iv_ptr, *src_ptr, *dst_ptr;
u8 key_exp[AES256_EXPAND_KEY_LENGTH];
u32 aes_blocks, key_len;
int enc;
if (argc != 7)
return CMD_RET_USAGE;
key_len = aes_get_key_len(argv[0]);
if (!strncmp(argv[1], "enc", 3))
enc = 1;
else if (!strncmp(argv[1], "dec", 3))
enc = 0;
else
return CMD_RET_USAGE;
key_addr = simple_strtoul(argv[2], NULL, 16);
iv_addr = simple_strtoul(argv[3], NULL, 16);
src_addr = simple_strtoul(argv[4], NULL, 16);
dst_addr = simple_strtoul(argv[5], NULL, 16);
len = simple_strtoul(argv[6], NULL, 16);
key_ptr = (uint8_t *)map_sysmem(key_addr, key_len);
iv_ptr = (uint8_t *)map_sysmem(iv_addr, 128 / 8);
src_ptr = (uint8_t *)map_sysmem(src_addr, len);
dst_ptr = (uint8_t *)map_sysmem(dst_addr, len);
/* First we expand the key. */
aes_expand_key(key_ptr, key_len, key_exp);
/* Calculate the number of AES blocks to encrypt. */
aes_blocks = DIV_ROUND_UP(len, AES_BLOCK_LENGTH);
if (enc)
aes_cbc_encrypt_blocks(key_len, key_exp, iv_ptr, src_ptr,
dst_ptr, aes_blocks);
else
aes_cbc_decrypt_blocks(key_len, key_exp, iv_ptr, src_ptr,
dst_ptr, aes_blocks);
unmap_sysmem(key_ptr);
unmap_sysmem(iv_ptr);
unmap_sysmem(src_ptr);
unmap_sysmem(dst_ptr);
return 0;
}
/***************************************************/
#ifdef CONFIG_SYS_LONGHELP
static char aes_help_text[] =
"[.128,.192,.256] enc key iv src dst len - Encrypt block of data $len bytes long\n"
" at address $src using a key at address\n"
" $key with initialization vector at address\n"
" $iv. Store the result at address $dst.\n"
" The $len size must be multiple of 16 bytes.\n"
" The $key and $iv must be 16 bytes long.\n"
"aes [.128,.192,.256] dec key iv src dst len - Decrypt block of data $len bytes long\n"
" at address $src using a key at address\n"
" $key with initialization vector at address\n"
" $iv. Store the result at address $dst.\n"
" The $len size must be multiple of 16 bytes.\n"
" The $key and $iv must be 16 bytes long.";
#endif
U_BOOT_CMD(
aes, 7, 1, do_aes,
"AES 128/192/256 CBC encryption",
aes_help_text
);
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