mirror of
https://github.com/brain-hackers/u-boot-brain
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83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
93 lines
2.8 KiB
C
93 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2014 Marek Vasut <marex@denx.de>
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*
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* Command for en/de-crypting block of memory with AES-128-CBC cipher.
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*/
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#include <common.h>
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#include <command.h>
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#include <environment.h>
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#include <uboot_aes.h>
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#include <malloc.h>
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#include <asm/byteorder.h>
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#include <linux/compiler.h>
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/**
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* do_aes() - Handle the "aes" command-line command
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* @cmdtp: Command data struct pointer
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* @flag: Command flag
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* @argc: Command-line argument count
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* @argv: Array of command-line arguments
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*
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* Returns zero on success, CMD_RET_USAGE in case of misuse and negative
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* on error.
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*/
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static int do_aes(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
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{
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uint32_t key_addr, iv_addr, src_addr, dst_addr, len;
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uint8_t *key_ptr, *iv_ptr, *src_ptr, *dst_ptr;
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uint8_t key_exp[AES_EXPAND_KEY_LENGTH];
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uint32_t aes_blocks;
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int enc;
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if (argc != 7)
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return CMD_RET_USAGE;
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if (!strncmp(argv[1], "enc", 3))
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enc = 1;
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else if (!strncmp(argv[1], "dec", 3))
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enc = 0;
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else
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return CMD_RET_USAGE;
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key_addr = simple_strtoul(argv[2], NULL, 16);
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iv_addr = simple_strtoul(argv[3], NULL, 16);
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src_addr = simple_strtoul(argv[4], NULL, 16);
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dst_addr = simple_strtoul(argv[5], NULL, 16);
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len = simple_strtoul(argv[6], NULL, 16);
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key_ptr = (uint8_t *)key_addr;
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iv_ptr = (uint8_t *)iv_addr;
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src_ptr = (uint8_t *)src_addr;
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dst_ptr = (uint8_t *)dst_addr;
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/* First we expand the key. */
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aes_expand_key(key_ptr, key_exp);
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/* Calculate the number of AES blocks to encrypt. */
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aes_blocks = DIV_ROUND_UP(len, AES_KEY_LENGTH);
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if (enc)
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aes_cbc_encrypt_blocks(key_exp, iv_ptr, src_ptr, dst_ptr,
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aes_blocks);
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else
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aes_cbc_decrypt_blocks(key_exp, iv_ptr, src_ptr, dst_ptr,
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aes_blocks);
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return 0;
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}
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/***************************************************/
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#ifdef CONFIG_SYS_LONGHELP
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static char aes_help_text[] =
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"enc key iv src dst len - Encrypt block of data $len bytes long\n"
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" at address $src using a key at address\n"
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" $key with initialization vector at address\n"
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" $iv. Store the result at address $dst.\n"
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" The $len size must be multiple of 16 bytes.\n"
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" The $key and $iv must be 16 bytes long.\n"
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"aes dec key iv src dst len - Decrypt block of data $len bytes long\n"
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" at address $src using a key at address\n"
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" $key with initialization vector at address\n"
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" $iv. Store the result at address $dst.\n"
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" The $len size must be multiple of 16 bytes.\n"
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" The $key and $iv must be 16 bytes long.";
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#endif
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U_BOOT_CMD(
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aes, 7, 1, do_aes,
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"AES 128 CBC encryption",
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aes_help_text
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);
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