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cmd/aes.c
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/* * Copyright (C) 2014 Marek Vasut <marex@denx.de> * * Command for en/de-crypting block of memory with AES-128-CBC cipher. * * SPDX-License-Identifier: GPL-2.0+ */ #include <common.h> #include <command.h> #include <environment.h> #include <uboot_aes.h> #include <malloc.h> #include <asm/byteorder.h> #include <linux/compiler.h> DECLARE_GLOBAL_DATA_PTR; /** * 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 " " at address $src using a key at address " " $key with initialization vector at address " " $iv. Store the result at address $dst. " " The $len size must be multiple of 16 bytes. " " The $key and $iv must be 16 bytes long. " "aes dec key iv src dst len - Decrypt block of data $len bytes long " " at address $src using a key at address " " $key with initialization vector at address " " $iv. Store the result at address $dst. " " The $len size must be multiple of 16 bytes. " " 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 ); |