mirror of
https://github.com/DarkMatterCore/nxdumptool.git
synced 2024-09-20 05:53:25 +01:00
378 lines
10 KiB
C
378 lines
10 KiB
C
/*
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* Copyright (c) 2020 DarkMatterCore
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include "nca.h"
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#include "keys.h"
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#include "rsa.h"
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#include "utils.h"
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/* Global variables. */
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static const u8 g_nca0KeyAreaHash[SHA256_HASH_SIZE] = {
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0x9A, 0xBB, 0xD2, 0x11, 0x86, 0x00, 0x21, 0x9D, 0x7A, 0xDC, 0x5B, 0x43, 0x95, 0xF8, 0x4E, 0xFD,
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0xFF, 0x6B, 0x25, 0xEF, 0x9F, 0x96, 0x85, 0x28, 0x18, 0x9E, 0x76, 0xB0, 0x92, 0xF0, 0x6A, 0xCB
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};
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/* Function prototypes. */
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static bool ncaCheckIfVersion0KeyAreaIsEncrypted(NcaContext *ctx);
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static void ncaUpdateAesCtrIv(u8 *ctr, u64 offset);
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static void ncaUpdateAesCtrExIv(u8 *ctr, u32 ctr_val, u64 offset);
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size_t aes128XtsNintendoCrypt(Aes128XtsContext *ctx, void *dst, const void *src, size_t size, u64 sector, size_t sector_size, bool encrypt)
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{
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if (!ctx || !dst || !src || !size || !sector_size || (size % sector_size) != 0)
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{
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LOGFILE("Invalid parameters!");
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return 0;
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}
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size_t i, crypt_res = 0;
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u64 cur_sector = sector;
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u8 *dst_u8 = (u8*)dst;
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const u8 *src_u8 = (const u8*)src;
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for(i = 0; i < size; i += sector_size, cur_sector++)
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{
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/* We have to force a sector reset on each new sector to actually enable Nintendo AES-XTS cipher tweak */
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aes128XtsContextResetSector(ctx, cur_sector, true);
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if (encrypt)
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{
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crypt_res = aes128XtsEncrypt(ctx, dst_u8 + i, src_u8 + i, sector_size);
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} else {
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crypt_res = aes128XtsDecrypt(ctx, dst_u8 + i, src_u8 + i, sector_size);
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}
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if (crypt_res != sector_size) break;
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}
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return i;
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}
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bool ncaDecryptKeyArea(NcaContext *ctx)
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{
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if (!ctx)
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{
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LOGFILE("Invalid NCA context!");
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return false;
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}
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Result rc = 0;
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const u8 *kek_src = NULL;
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u8 key_count, tmp_kek[0x10] = {0};
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/* Check if we're dealing with a NCA0 with a plain text key area */
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if (ctx->format_version == NcaVersion_Nca0 && !ncaCheckIfVersion0KeyAreaIsEncrypted(ctx))
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{
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memcpy(ctx->decrypted_keys, ctx->header.encrypted_keys, 0x40);
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return true;
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}
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kek_src = keysGetKeyAreaEncryptionKeySource(ctx->header.kaek_index);
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if (!kek_src)
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{
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LOGFILE("Unable to retrieve KAEK source for index 0x%02X!", ctx->header.kaek_index);
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return false;
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}
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rc = splCryptoGenerateAesKek(kek_src, ctx->key_generation, 0, tmp_kek);
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if (R_FAILED(rc))
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{
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LOGFILE("splCryptoGenerateAesKek failed! (0x%08X)", rc);
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return false;
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}
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key_count = (ctx->format_version == NcaVersion_Nca0 ? 2 : 4);
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for(u8 i = 0; i < key_count; i++)
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{
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rc = splCryptoGenerateAesKey(tmp_kek, &(ctx->header.encrypted_keys[i]), &(ctx->decrypted_keys[i]));
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if (R_FAILED(rc))
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{
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LOGFILE("splCryptoGenerateAesKey failed! (0x%08X)", rc);
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return false;
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}
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}
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return true;
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}
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bool ncaEncryptKeyArea(NcaContext *ctx)
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{
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if (!ctx)
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{
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LOGFILE("Invalid NCA context!");
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return false;
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}
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u8 key_count;
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const u8 *kaek = NULL;
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Aes128Context key_area_ctx = {0};
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/* Check if we're dealing with a NCA0 with a plain text key area */
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if (ctx->format_version == NcaVersion_Nca0 && !ncaCheckIfVersion0KeyAreaIsEncrypted(ctx))
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{
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memcpy(ctx->header.encrypted_keys, ctx->decrypted_keys, 0x40);
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return true;
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}
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kaek = keysGetKeyAreaEncryptionKey(ctx->key_generation, ctx->header.kaek_index);
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if (!kaek)
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{
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LOGFILE("Unable to retrieve KAEK for key generation 0x%02X and KAEK index 0x%02X!", ctx->key_generation, ctx->header.kaek_index);
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return false;
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}
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key_count = (ctx->format_version == NcaVersion_Nca0 ? 2 : 4);
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aes128ContextCreate(&key_area_ctx, kaek, true);
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for(u8 i = 0; i < key_count; i++) aes128EncryptBlock(&key_area_ctx, &(ctx->header.encrypted_keys[i]), &(ctx->decrypted_keys[i]));
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return true;
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}
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bool ncaDecryptHeader(NcaContext *ctx)
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{
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if (!ctx)
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{
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LOGFILE("Invalid NCA context!");
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return false;
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}
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u32 i, magic = 0;
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size_t crypt_res = 0;
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const u8 *header_key = NULL;
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Aes128XtsContext hdr_aes_ctx = {0}, nca0_fs_header_ctx = {0};
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header_key = keysGetNcaHeaderKey();
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aes128XtsContextCreate(&hdr_aes_ctx, header_key, header_key + 0x10, false);
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crypt_res = aes128XtsNintendoCrypt(&hdr_aes_ctx, &(ctx->header), &(ctx->header), NCA_HEADER_LENGTH, 0, NCA_AES_XTS_SECTOR_SIZE, false);
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if (crypt_res != NCA_HEADER_LENGTH)
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{
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LOGFILE("Invalid output length for decrypted NCA header! (0x%X != 0x%lX)", NCA_HEADER_LENGTH, crypt_res);
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return false;
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}
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magic = __builtin_bswap32(ctx->header.magic);
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switch(magic)
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{
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case NCA_NCA3_MAGIC:
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ctx->format_version = NcaVersion_Nca3;
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crypt_res = aes128XtsNintendoCrypt(&hdr_aes_ctx, &(ctx->header), &(ctx->header), NCA_FULL_HEADER_LENGTH, 0, NCA_AES_XTS_SECTOR_SIZE, false);
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if (crypt_res != NCA_FULL_HEADER_LENGTH)
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{
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LOGFILE("Error decrypting full NCA3 header!");
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return false;
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}
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break;
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case NCA_NCA2_MAGIC:
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ctx->format_version = NcaVersion_Nca2;
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for(i = 0; i < NCA_FS_HEADER_COUNT; i++)
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{
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if (!ctx->header.fs_entries[i].enable_entry) continue;
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crypt_res = aes128XtsNintendoCrypt(&hdr_aes_ctx, &(ctx->header.fs_headers[i]), &(ctx->header.fs_headers[i]), NCA_FS_HEADER_LENGTH, 0, NCA_AES_XTS_SECTOR_SIZE, false);
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if (crypt_res != NCA_FS_HEADER_LENGTH)
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{
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LOGFILE("Error decrypting NCA2 FS section header #%u!", i);
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return false;
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}
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}
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break;
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case NCA_NCA0_MAGIC:
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ctx->format_version = NcaVersion_Nca0;
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/* We first need to decrypt the key area from the NCA0 header in order to access its FS section headers */
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if (!ncaDecryptKeyArea(ctx))
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{
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LOGFILE("Error decrypting key area from NCA0 header!");
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return false;
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}
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aes128XtsContextCreate(&nca0_fs_header_ctx, &(ctx->decrypted_keys[0]), &(ctx->decrypted_keys[1]), false);
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for(i = 0; i < NCA_FS_HEADER_COUNT; i++)
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{
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if (!ctx->header.fs_entries[i].enable_entry) continue;
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}
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break;
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default:
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LOGFILE("Invalid NCA magic word! Wrong header key? (0x%08X)", magic);
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return false;
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}
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/* Fill additional context info */
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ctx->key_generation = ncaGetKeyGenerationValue(ctx);
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ctx->rights_id_available = ncaCheckRightsIdAvailability(ctx);
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return true;
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}
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bool ncaEncryptHeader(NcaContext *ctx)
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{
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if (!ctx)
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{
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LOGFILE("Invalid NCA context!");
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return false;
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}
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u32 i;
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size_t crypt_res = 0;
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const u8 *header_key = NULL;
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Aes128XtsContext hdr_aes_ctx = {0};
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header_key = keysGetNcaHeaderKey();
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aes128XtsContextCreate(&hdr_aes_ctx, header_key, header_key + 0x10, true);
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switch(ctx->format_version)
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{
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case NcaVersion_Nca3:
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crypt_res = aes128XtsNintendoCrypt(&hdr_aes_ctx, &(ctx->header), &(ctx->header), NCA_FULL_HEADER_LENGTH, 0, NCA_AES_XTS_SECTOR_SIZE, true);
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if (crypt_res != NCA_FULL_HEADER_LENGTH)
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{
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LOGFILE("Error encrypting full NCA3 header!");
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return false;
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}
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break;
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case NcaVersion_Nca2:
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crypt_res = aes128XtsNintendoCrypt(&hdr_aes_ctx, &(ctx->header), &(ctx->header), NCA_HEADER_LENGTH, 0, NCA_AES_XTS_SECTOR_SIZE, true);
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if (crypt_res != NCA_HEADER_LENGTH)
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{
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LOGFILE("Error encrypting partial NCA2 header!");
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return false;
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}
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for(i = 0; i < NCA_FS_HEADER_COUNT; i++)
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{
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if (!ctx->header.fs_entries[i].enable_entry) continue;
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crypt_res = aes128XtsNintendoCrypt(&hdr_aes_ctx, &(ctx->header.fs_headers[i]), &(ctx->header.fs_headers[i]), NCA_FS_HEADER_LENGTH, 0, NCA_AES_XTS_SECTOR_SIZE, true);
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if (crypt_res != NCA_FS_HEADER_LENGTH)
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{
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LOGFILE("Error encrypting NCA2 FS section header #%u!", i);
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return false;
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}
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}
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break;
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case NcaVersion_Nca0:
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/* There's nothing else to do */
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break;
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default:
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LOGFILE("Invalid NCA format version! (0x%02X)", ctx->format_version);
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return false;
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}
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return true;
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}
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static bool ncaCheckIfVersion0KeyAreaIsEncrypted(NcaContext *ctx)
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{
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if (!ctx || ctx->format_version != NcaVersion_Nca0) return false;
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u8 nca0_key_area_hash[SHA256_HASH_SIZE] = {0};
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sha256CalculateHash(nca0_key_area_hash, ctx->header.encrypted_keys, 0x40);
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if (!memcmp(nca0_key_area_hash, g_nca0KeyAreaHash, SHA256_HASH_SIZE)) return false;
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return true;
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}
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static void ncaUpdateAesCtrIv(u8 *ctr, u64 offset)
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{
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if (!ctr) return;
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offset >>= 4;
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for(u8 i = 0; i < 8; i++)
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{
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ctr[0x10 - i - 1] = (u8)(offset & 0xFF);
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offset >>= 8;
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}
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}
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static void ncaUpdateAesCtrExIv(u8 *ctr, u32 ctr_val, u64 offset)
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{
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if (!ctr) return;
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offset >>= 4;
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for(u8 i = 0; i < 8; i++)
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{
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ctr[0x10 - i - 1] = (u8)(offset & 0xFF);
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offset >>= 8;
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}
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for(u8 i = 0; i < 4; i++)
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{
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ctr[0x8 - i - 1] = (u8)(ctr_val & 0xFF);
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ctr_val >>= 8;
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}
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}
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