12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747576777879808182838485868788899091929394959697 |
- // 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-CBC cipher.
- */
- #include <common.h>
- #include <command.h>
- #include <uboot_aes.h>
- #include <malloc.h>
- #include <asm/byteorder.h>
- #include <linux/compiler.h>
- #include <mapmem.h>
- /**
- * 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 *)map_sysmem(key_addr, 128 / 8);
- 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_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);
- 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[] =
- "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 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 CBC encryption",
- aes_help_text
- );
|