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cmd/aes.c
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// SPDX-License-Identifier: GPL-2.0+ |
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/* * Copyright (C) 2014 Marek Vasut <marex@denx.de> * |
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* Command for en/de-crypting block of memory with AES-[128/192/256]-CBC cipher. |
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*/ #include <common.h> #include <command.h> |
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#include <uboot_aes.h> |
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#include <malloc.h> #include <asm/byteorder.h> #include <linux/compiler.h> |
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#include <mapmem.h> |
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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; } |
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/** * 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[]) { |
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uint32_t key_addr, iv_addr, src_addr, dst_addr, len; uint8_t *key_ptr, *iv_ptr, *src_ptr, *dst_ptr; |
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u8 key_exp[AES256_EXPAND_KEY_LENGTH]; u32 aes_blocks, key_len; |
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int enc; |
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if (argc != 7) |
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return CMD_RET_USAGE; |
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key_len = aes_get_key_len(argv[0]); |
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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); |
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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); |
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key_ptr = (uint8_t *)map_sysmem(key_addr, key_len); |
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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); |
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/* First we expand the key. */ |
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aes_expand_key(key_ptr, key_len, key_exp); |
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/* Calculate the number of AES blocks to encrypt. */ |
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aes_blocks = DIV_ROUND_UP(len, AES_BLOCK_LENGTH); |
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if (enc) |
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aes_cbc_encrypt_blocks(key_len, key_exp, iv_ptr, src_ptr, dst_ptr, aes_blocks); |
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else |
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aes_cbc_decrypt_blocks(key_len, key_exp, iv_ptr, src_ptr, dst_ptr, aes_blocks); |
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unmap_sysmem(key_ptr); unmap_sysmem(iv_ptr); unmap_sysmem(src_ptr); unmap_sysmem(dst_ptr); |
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return 0; } /***************************************************/ #ifdef CONFIG_SYS_LONGHELP static char aes_help_text[] = |
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"[.128,.192,.256] enc key iv src dst len - Encrypt block of data $len bytes long " |
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" 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. " |
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"aes [.128,.192,.256] dec key iv src dst len - Decrypt block of data $len bytes long " |
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" 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."; |
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#endif U_BOOT_CMD( |
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aes, 7, 1, do_aes, |
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"AES 128/192/256 CBC encryption", |
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aes_help_text ); |