12e192b24SSimon Glass /*
22e192b24SSimon Glass * Copyright (C) 2014 Marek Vasut <marex@denx.de>
32e192b24SSimon Glass *
42e192b24SSimon Glass * Command for en/de-crypting block of memory with AES-128-CBC cipher.
52e192b24SSimon Glass *
62e192b24SSimon Glass * SPDX-License-Identifier: GPL-2.0+
72e192b24SSimon Glass */
82e192b24SSimon Glass
92e192b24SSimon Glass #include <common.h>
102e192b24SSimon Glass #include <command.h>
112e192b24SSimon Glass #include <environment.h>
12*b80c0b99SStefano Babic #include <uboot_aes.h>
132e192b24SSimon Glass #include <malloc.h>
142e192b24SSimon Glass #include <asm/byteorder.h>
152e192b24SSimon Glass #include <linux/compiler.h>
162e192b24SSimon Glass
172e192b24SSimon Glass DECLARE_GLOBAL_DATA_PTR;
182e192b24SSimon Glass
192e192b24SSimon Glass /**
202e192b24SSimon Glass * do_aes() - Handle the "aes" command-line command
212e192b24SSimon Glass * @cmdtp: Command data struct pointer
222e192b24SSimon Glass * @flag: Command flag
232e192b24SSimon Glass * @argc: Command-line argument count
242e192b24SSimon Glass * @argv: Array of command-line arguments
252e192b24SSimon Glass *
262e192b24SSimon Glass * Returns zero on success, CMD_RET_USAGE in case of misuse and negative
272e192b24SSimon Glass * on error.
282e192b24SSimon Glass */
do_aes(cmd_tbl_t * cmdtp,int flag,int argc,char * const argv[])292e192b24SSimon Glass static int do_aes(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
302e192b24SSimon Glass {
312e192b24SSimon Glass uint32_t key_addr, src_addr, dst_addr, len;
322e192b24SSimon Glass uint8_t *key_ptr, *src_ptr, *dst_ptr;
332e192b24SSimon Glass uint8_t key_exp[AES_EXPAND_KEY_LENGTH];
342e192b24SSimon Glass uint32_t aes_blocks;
352e192b24SSimon Glass int enc;
362e192b24SSimon Glass
372e192b24SSimon Glass if (argc != 6)
382e192b24SSimon Glass return CMD_RET_USAGE;
392e192b24SSimon Glass
402e192b24SSimon Glass if (!strncmp(argv[1], "enc", 3))
412e192b24SSimon Glass enc = 1;
422e192b24SSimon Glass else if (!strncmp(argv[1], "dec", 3))
432e192b24SSimon Glass enc = 0;
442e192b24SSimon Glass else
452e192b24SSimon Glass return CMD_RET_USAGE;
462e192b24SSimon Glass
472e192b24SSimon Glass key_addr = simple_strtoul(argv[2], NULL, 16);
482e192b24SSimon Glass src_addr = simple_strtoul(argv[3], NULL, 16);
492e192b24SSimon Glass dst_addr = simple_strtoul(argv[4], NULL, 16);
502e192b24SSimon Glass len = simple_strtoul(argv[5], NULL, 16);
512e192b24SSimon Glass
522e192b24SSimon Glass key_ptr = (uint8_t *)key_addr;
532e192b24SSimon Glass src_ptr = (uint8_t *)src_addr;
542e192b24SSimon Glass dst_ptr = (uint8_t *)dst_addr;
552e192b24SSimon Glass
562e192b24SSimon Glass /* First we expand the key. */
572e192b24SSimon Glass aes_expand_key(key_ptr, key_exp);
582e192b24SSimon Glass
592e192b24SSimon Glass /* Calculate the number of AES blocks to encrypt. */
602e192b24SSimon Glass aes_blocks = DIV_ROUND_UP(len, AES_KEY_LENGTH);
612e192b24SSimon Glass
622e192b24SSimon Glass if (enc)
632e192b24SSimon Glass aes_cbc_encrypt_blocks(key_exp, src_ptr, dst_ptr, aes_blocks);
642e192b24SSimon Glass else
652e192b24SSimon Glass aes_cbc_decrypt_blocks(key_exp, src_ptr, dst_ptr, aes_blocks);
662e192b24SSimon Glass
672e192b24SSimon Glass return 0;
682e192b24SSimon Glass }
692e192b24SSimon Glass
702e192b24SSimon Glass /***************************************************/
712e192b24SSimon Glass #ifdef CONFIG_SYS_LONGHELP
722e192b24SSimon Glass static char aes_help_text[] =
732e192b24SSimon Glass "enc key src dst len - Encrypt block of data $len bytes long\n"
742e192b24SSimon Glass " at address $src using a key at address\n"
752e192b24SSimon Glass " $key and store the result at address\n"
762e192b24SSimon Glass " $dst. The $len size must be multiple of\n"
772e192b24SSimon Glass " 16 bytes and $key must be 16 bytes long.\n"
782e192b24SSimon Glass "aes dec key src dst len - Decrypt block of data $len bytes long\n"
792e192b24SSimon Glass " at address $src using a key at address\n"
802e192b24SSimon Glass " $key and store the result at address\n"
812e192b24SSimon Glass " $dst. The $len size must be multiple of\n"
822e192b24SSimon Glass " 16 bytes and $key must be 16 bytes long.";
832e192b24SSimon Glass #endif
842e192b24SSimon Glass
852e192b24SSimon Glass U_BOOT_CMD(
862e192b24SSimon Glass aes, 6, 1, do_aes,
872e192b24SSimon Glass "AES 128 CBC encryption",
882e192b24SSimon Glass aes_help_text
892e192b24SSimon Glass );
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