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7e5f460ec4
It is a pain to have to specify the value 16 in each call. Add a new hextoul() function and update the code to use it. Add a proper comment to simple_strtoul() while we are here. Signed-off-by: Simon Glass <sjg@chromium.org>
112 lines
3.2 KiB
C
112 lines
3.2 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-[128/192/256]-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 <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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#include <mapmem.h>
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u32 aes_get_key_len(char *command)
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{
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u32 key_len = AES128_KEY_LENGTH;
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if (!strcmp(command, "aes.192"))
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key_len = AES192_KEY_LENGTH;
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else if (!strcmp(command, "aes.256"))
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key_len = AES256_KEY_LENGTH;
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return key_len;
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}
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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(struct cmd_tbl *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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u8 key_exp[AES256_EXPAND_KEY_LENGTH];
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u32 aes_blocks, key_len;
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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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key_len = aes_get_key_len(argv[0]);
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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 = hextoul(argv[2], NULL);
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iv_addr = hextoul(argv[3], NULL);
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src_addr = hextoul(argv[4], NULL);
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dst_addr = hextoul(argv[5], NULL);
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len = hextoul(argv[6], NULL);
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key_ptr = (uint8_t *)map_sysmem(key_addr, key_len);
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iv_ptr = (uint8_t *)map_sysmem(iv_addr, 128 / 8);
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src_ptr = (uint8_t *)map_sysmem(src_addr, len);
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dst_ptr = (uint8_t *)map_sysmem(dst_addr, len);
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/* First we expand the key. */
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aes_expand_key(key_ptr, key_len, 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_BLOCK_LENGTH);
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if (enc)
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aes_cbc_encrypt_blocks(key_len, key_exp, iv_ptr, src_ptr,
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dst_ptr, aes_blocks);
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else
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aes_cbc_decrypt_blocks(key_len, key_exp, iv_ptr, src_ptr,
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dst_ptr, aes_blocks);
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unmap_sysmem(key_ptr);
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unmap_sysmem(iv_ptr);
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unmap_sysmem(src_ptr);
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unmap_sysmem(dst_ptr);
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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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"[.128,.192,.256] 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 [.128,.192,.256] 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 128/192/256 CBC encryption",
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aes_help_text
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);
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