[u-boot.git] / cmd / aes.c

// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (C) 2014 Marek Vasut <[email protected]>
 *
 * Command for en/de-crypting block of memory with AES-128-CBC cipher.
 */

#include <common.h>
#include <command.h>
#include <environment.h>
#include <uboot_aes.h>
#include <malloc.h>
#include <asm/byteorder.h>
#include <linux/compiler.h>

/**
 * 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;
	uint8_t key_exp[AES_EXPAND_KEY_LENGTH];
	uint32_t aes_blocks;
	int enc;

	if (argc != 7)
		return CMD_RET_USAGE;

	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 *)key_addr;
	iv_ptr = (uint8_t *)iv_addr;
	src_ptr = (uint8_t *)src_addr;
	dst_ptr = (uint8_t *)dst_addr;

	/* First we expand the key. */
	aes_expand_key(key_ptr, key_exp);

	/* Calculate the number of AES blocks to encrypt. */
	aes_blocks = DIV_ROUND_UP(len, AES_KEY_LENGTH);

	if (enc)
		aes_cbc_encrypt_blocks(key_exp, iv_ptr, src_ptr, dst_ptr,
				       aes_blocks);
	else
		aes_cbc_decrypt_blocks(key_exp, iv_ptr, src_ptr, dst_ptr,
				       aes_blocks);

	return 0;
}

/***************************************************/
#ifdef CONFIG_SYS_LONGHELP
static char aes_help_text[] =
	"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 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 CBC encryption",
	aes_help_text
);
Commit	Line	Data
83d290c5	1	// SPDX-License-Identifier: GPL-2.0+
b401b73d MV	2	/*
	3	* Copyright (C) 2014 Marek Vasut <[email protected]>
	4	*
	5	* Command for en/de-crypting block of memory with AES-128-CBC cipher.
b401b73d MV	6	*/
	7
	8	#include <common.h>
	9	#include <command.h>
	10	#include <environment.h>
b80c0b99	11	#include <uboot_aes.h>
b401b73d MV	12	#include <malloc.h>
	13	#include <asm/byteorder.h>
	14	#include <linux/compiler.h>
	15
b401b73d MV	16	/**
	17	* do_aes() - Handle the "aes" command-line command
	18	* @cmdtp: Command data struct pointer
	19	* @flag: Command flag
	20	* @argc: Command-line argument count
	21	* @argv: Array of command-line arguments
	22	*
	23	* Returns zero on success, CMD_RET_USAGE in case of misuse and negative
	24	* on error.
	25	*/
	26	static int do_aes(cmd_tbl_t cmdtp, int flag, int argc, char const argv[])
	27	{
af09eba6 АМ	28	uint32_t key_addr, iv_addr, src_addr, dst_addr, len;
af09eba6 АМ	29	uint8_t key_ptr, iv_ptr, src_ptr, dst_ptr;
b401b73d MV	30	uint8_t key_exp[AES_EXPAND_KEY_LENGTH];
	31	uint32_t aes_blocks;
	32	int enc;
	33
af09eba6	34	if (argc != 7)
b401b73d MV	35	return CMD_RET_USAGE;
	36
	37	if (!strncmp(argv[1], "enc", 3))
	38	enc = 1;
	39	else if (!strncmp(argv[1], "dec", 3))
	40	enc = 0;
	41	else
	42	return CMD_RET_USAGE;
	43
	44	key_addr = simple_strtoul(argv[2], NULL, 16);
af09eba6 АМ	45	iv_addr = simple_strtoul(argv[3], NULL, 16);
	46	src_addr = simple_strtoul(argv[4], NULL, 16);
	47	dst_addr = simple_strtoul(argv[5], NULL, 16);
	48	len = simple_strtoul(argv[6], NULL, 16);
b401b73d MV	49
b401b73d MV	50	key_ptr = (uint8_t *)key_addr;
af09eba6	51	iv_ptr = (uint8_t *)iv_addr;
b401b73d MV	52	src_ptr = (uint8_t *)src_addr;
	53	dst_ptr = (uint8_t *)dst_addr;
	54
	55	/* First we expand the key. */
	56	aes_expand_key(key_ptr, key_exp);
	57
	58	/* Calculate the number of AES blocks to encrypt. */
	59	aes_blocks = DIV_ROUND_UP(len, AES_KEY_LENGTH);
	60
	61	if (enc)
af09eba6 АМ	62	aes_cbc_encrypt_blocks(key_exp, iv_ptr, src_ptr, dst_ptr,
af09eba6 АМ	63	aes_blocks);
b401b73d	64	else
af09eba6 АМ	65	aes_cbc_decrypt_blocks(key_exp, iv_ptr, src_ptr, dst_ptr,
af09eba6 АМ	66	aes_blocks);
b401b73d MV	67
	68	return 0;
	69	}
	70
	71	/***************************************************/
	72	#ifdef CONFIG_SYS_LONGHELP
	73	static char aes_help_text[] =
af09eba6 АМ	74	"enc key iv src dst len - Encrypt block of data $len bytes long\n"
	75	" at address $src using a key at address\n"
	76	" $key with initialization vector at address\n"
	77	" $iv. Store the result at address $dst.\n"
	78	" The $len size must be multiple of 16 bytes.\n"
	79	" The $key and $iv must be 16 bytes long.\n"
	80	"aes dec key iv src dst len - Decrypt block of data $len bytes long\n"
	81	" at address $src using a key at address\n"
	82	" $key with initialization vector at address\n"
	83	" $iv. Store the result at address $dst.\n"
	84	" The $len size must be multiple of 16 bytes.\n"
	85	" The $key and $iv must be 16 bytes long.";
b401b73d MV	86	#endif
	87
	88	U_BOOT_CMD(
af09eba6	89	aes, 7, 1, do_aes,
b401b73d MV	90	"AES 128 CBC encryption",
	91	aes_help_text
	92	);