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https://github.com/AsahiLinux/u-boot
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90 lines
2.5 KiB
C
90 lines
2.5 KiB
C
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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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* SPDX-License-Identifier: GPL-2.0+
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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 <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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DECLARE_GLOBAL_DATA_PTR;
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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, src_addr, dst_addr, len;
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uint8_t *key_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 != 6)
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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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src_addr = simple_strtoul(argv[3], NULL, 16);
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dst_addr = simple_strtoul(argv[4], NULL, 16);
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len = simple_strtoul(argv[5], NULL, 16);
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key_ptr = (uint8_t *)key_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, src_ptr, dst_ptr, aes_blocks);
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else
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aes_cbc_decrypt_blocks(key_exp, src_ptr, dst_ptr, 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 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 and store the result at address\n"
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" $dst. The $len size must be multiple of\n"
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" 16 bytes and $key must be 16 bytes long.\n"
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"aes dec key 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 and store the result at address\n"
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" $dst. The $len size must be multiple of\n"
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" 16 bytes and $key must be 16 bytes long.";
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#endif
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U_BOOT_CMD(
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aes, 6, 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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