// SPDX-License-Identifier: GPL-2.0+ /* * Copyright (C) 2014 Marek Vasut * * Command for en/de-crypting block of memory with AES-[128/192/256]-CBC cipher. */ #include #include #include #include #include #include #include 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; } /***************************************************/ #ifdef CONFIG_SYS_LONGHELP static char aes_help_text[] = "[.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."; #endif U_BOOT_CMD( aes, 7, 1, do_aes, "AES 128/192/256 CBC encryption", aes_help_text );