diff options
Diffstat (limited to 'cmd/aes.c')
| -rw-r--r-- | cmd/aes.c | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/cmd/aes.c b/cmd/aes.c new file mode 100644 index 00000000000..87ad1ab82b9 --- /dev/null +++ b/cmd/aes.c @@ -0,0 +1,109 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (C) 2014 Marek Vasut <marex@denx.de> + * + * Command for en/de-crypting block of memory with AES-[128/192/256]-CBC cipher. + */ + +#include <command.h> +#include <uboot_aes.h> +#include <malloc.h> +#include <asm/byteorder.h> +#include <linux/compiler.h> +#include <mapmem.h> +#include <vsprintf.h> + +u32 aes_get_key_len(char *command) +{ + u32 key_len = AES128_KEY_LENGTH; + + if (!strcmp(command, "aes.192")) + key_len = AES192_KEY_LENGTH; + else if (!strcmp(command, "aes.256")) + key_len = AES256_KEY_LENGTH; + + return key_len; +} + +/** + * 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(struct cmd_tbl *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; + u8 key_exp[AES256_EXPAND_KEY_LENGTH]; + u32 aes_blocks, key_len; + int enc; + + if (argc != 7) + return CMD_RET_USAGE; + + key_len = aes_get_key_len(argv[0]); + + if (!strncmp(argv[1], "enc", 3)) + enc = 1; + else if (!strncmp(argv[1], "dec", 3)) + enc = 0; + else + return CMD_RET_USAGE; + + key_addr = hextoul(argv[2], NULL); + iv_addr = hextoul(argv[3], NULL); + src_addr = hextoul(argv[4], NULL); + dst_addr = hextoul(argv[5], NULL); + len = hextoul(argv[6], NULL); + + key_ptr = (uint8_t *)map_sysmem(key_addr, key_len); + iv_ptr = (uint8_t *)map_sysmem(iv_addr, 128 / 8); + src_ptr = (uint8_t *)map_sysmem(src_addr, len); + dst_ptr = (uint8_t *)map_sysmem(dst_addr, len); + + /* First we expand the key. */ + aes_expand_key(key_ptr, key_len, key_exp); + + /* Calculate the number of AES blocks to encrypt. */ + aes_blocks = DIV_ROUND_UP(len, AES_BLOCK_LENGTH); + + if (enc) + aes_cbc_encrypt_blocks(key_len, key_exp, iv_ptr, src_ptr, + dst_ptr, aes_blocks); + else + aes_cbc_decrypt_blocks(key_len, key_exp, iv_ptr, src_ptr, + dst_ptr, aes_blocks); + + unmap_sysmem(key_ptr); + unmap_sysmem(iv_ptr); + unmap_sysmem(src_ptr); + unmap_sysmem(dst_ptr); + + return 0; +} + +/***************************************************/ +U_BOOT_LONGHELP(aes, + "[.128,.192,.256] 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 [.128,.192,.256] 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."); + +U_BOOT_CMD( + aes, 7, 1, do_aes, + "AES 128/192/256 CBC encryption", + aes_help_text +); |