1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Copyright (C) 2014 Marek Vasut <marex@denx.de> 4 * 5 * Command for en/de-crypting block of memory with AES-128-CBC cipher. 6 */ 7 8 #include <common.h> 9 #include <command.h> 10 #include <environment.h> 11 #include <uboot_aes.h> 12 #include <malloc.h> 13 #include <asm/byteorder.h> 14 #include <linux/compiler.h> 15 16 /** 17 * do_aes() - Handle the "aes" command-line command 18 * @cmdtp: Command data struct pointer 19 * @flag: Command flag 20 * @argc: Command-line argument count 21 * @argv: Array of command-line arguments 22 * 23 * Returns zero on success, CMD_RET_USAGE in case of misuse and negative 24 * on error. 25 */ 26 static int do_aes(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[]) 27 { 28 uint32_t key_addr, iv_addr, src_addr, dst_addr, len; 29 uint8_t *key_ptr, *iv_ptr, *src_ptr, *dst_ptr; 30 uint8_t key_exp[AES_EXPAND_KEY_LENGTH]; 31 uint32_t aes_blocks; 32 int enc; 33 34 if (argc != 7) 35 return CMD_RET_USAGE; 36 37 if (!strncmp(argv[1], "enc", 3)) 38 enc = 1; 39 else if (!strncmp(argv[1], "dec", 3)) 40 enc = 0; 41 else 42 return CMD_RET_USAGE; 43 44 key_addr = simple_strtoul(argv[2], NULL, 16); 45 iv_addr = simple_strtoul(argv[3], NULL, 16); 46 src_addr = simple_strtoul(argv[4], NULL, 16); 47 dst_addr = simple_strtoul(argv[5], NULL, 16); 48 len = simple_strtoul(argv[6], NULL, 16); 49 50 key_ptr = (uint8_t *)key_addr; 51 iv_ptr = (uint8_t *)iv_addr; 52 src_ptr = (uint8_t *)src_addr; 53 dst_ptr = (uint8_t *)dst_addr; 54 55 /* First we expand the key. */ 56 aes_expand_key(key_ptr, key_exp); 57 58 /* Calculate the number of AES blocks to encrypt. */ 59 aes_blocks = DIV_ROUND_UP(len, AES_KEY_LENGTH); 60 61 if (enc) 62 aes_cbc_encrypt_blocks(key_exp, iv_ptr, src_ptr, dst_ptr, 63 aes_blocks); 64 else 65 aes_cbc_decrypt_blocks(key_exp, iv_ptr, src_ptr, dst_ptr, 66 aes_blocks); 67 68 return 0; 69 } 70 71 /***************************************************/ 72 #ifdef CONFIG_SYS_LONGHELP 73 static char aes_help_text[] = 74 "enc key iv src dst len - Encrypt block of data $len bytes long\n" 75 " at address $src using a key at address\n" 76 " $key with initialization vector at address\n" 77 " $iv. Store the result at address $dst.\n" 78 " The $len size must be multiple of 16 bytes.\n" 79 " The $key and $iv must be 16 bytes long.\n" 80 "aes dec key iv src dst len - Decrypt block of data $len bytes long\n" 81 " at address $src using a key at address\n" 82 " $key with initialization vector at address\n" 83 " $iv. Store the result at address $dst.\n" 84 " The $len size must be multiple of 16 bytes.\n" 85 " The $key and $iv must be 16 bytes long."; 86 #endif 87 88 U_BOOT_CMD( 89 aes, 7, 1, do_aes, 90 "AES 128 CBC encryption", 91 aes_help_text 92 ); 93