/* * keys.c * * Copyright (c) 2018-2020, SciresM. * Copyright (c) 2019, shchmue. * Copyright (c) 2020-2021, DarkMatterCore . * * This file is part of nxdumptool (https://github.com/DarkMatterCore/nxdumptool). * * nxdumptool is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * nxdumptool is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . */ #include "nxdt_utils.h" #include "keys.h" #include "mem.h" #include "nca.h" #include "rsa.h" #define KEYS_FILE_PATH "sdmc:/switch/prod.keys" /* Location used by Lockpick_RCM. */ #define ETICKET_RSA_DEVICE_KEY_PUBLIC_EXPONENT 0x10001 /* Type definitions. */ typedef bool (*KeysIsKeyMandatoryFunction)(void); /* Used to determine if a key is mandatory or not at runtime. */ typedef struct { char name[64]; u8 hash[SHA256_HASH_SIZE]; u64 size; void *dst; KeysIsKeyMandatoryFunction mandatory_func; ///< If NULL, key is mandatory. } KeysMemoryKey; typedef struct { MemoryLocation location; u32 key_count; KeysMemoryKey keys[]; } KeysMemoryInfo; typedef struct { ///< AES-128-XTS key needed to handle NCA header crypto. u8 nca_header_kek_source[AES_128_KEY_SIZE]; ///< Retrieved from the .rodata segment in the FS sysmodule. u8 nca_header_key_source[AES_128_KEY_SIZE * 2]; ///< Retrieved from the .data segment in the FS sysmodule. u8 nca_header_kek_sealed[AES_128_KEY_SIZE]; ///< Generated from nca_header_kek_source. Sealed by the SMC AES engine. u8 nca_header_key[AES_128_KEY_SIZE * 2]; ///< Generated from nca_header_kek_sealed and nca_header_key_source. ///< RSA-2048-PSS moduli used to verify the main signature from NCA headers. u8 nca_main_signature_moduli_prod[NcaMainSignatureKeyGeneration_Max][RSA2048_PUBKEY_SIZE]; ///< Moduli used in retail units. Retrieved from the .rodata segment in the FS sysmodule. u8 nca_main_signature_moduli_dev[NcaMainSignatureKeyGeneration_Max][RSA2048_PUBKEY_SIZE]; ///< Moduli used in development units. Retrieved from the .rodata segment in the FS sysmodule. ///< AES-128-ECB keys needed to handle key area crypto from NCA headers. u8 nca_kaek_sources[NcaKeyAreaEncryptionKeyIndex_Count][AES_128_KEY_SIZE]; ///< Retrieved from the .rodata segment in the FS sysmodule. u8 nca_kaek_sealed[NcaKeyAreaEncryptionKeyIndex_Count][NcaKeyGeneration_Max][AES_128_KEY_SIZE]; ///< Generated from nca_kaek_sources. Sealed by the SMC AES engine. u8 nca_kaek[NcaKeyAreaEncryptionKeyIndex_Count][NcaKeyGeneration_Max][AES_128_KEY_SIZE]; ///< Unsealed key area encryption keys. Retrieved from the Lockpick_RCM keys file. ///< AES-128-CTR key needed to decrypt the console-specific eTicket RSA device key stored in PRODINFO. u8 eticket_rsa_kek[AES_128_KEY_SIZE]; ///< eTicket RSA key encryption key (generic). Retrieved from the Lockpick_RCM keys file. u8 eticket_rsa_kek_personalized[AES_128_KEY_SIZE]; ///< eTicket RSA key encryption key (console-specific). Retrieved from the Lockpick_RCM keys file. ///< AES-128-ECB keys needed to decrypt titlekeys. u8 ticket_common_keys[NcaKeyGeneration_Max][AES_128_KEY_SIZE]; ///< Retrieved from the Lockpick_RCM keys file. } KeysNcaKeyset; typedef struct { /// AES-128-CBC keys needed to decrypt the CardInfo area from gamecard headers. const u8 gc_cardinfo_kek_source[AES_128_KEY_SIZE]; ///< Randomly generated KEK source to decrypt official CardInfo area keys. const u8 gc_cardinfo_key_prod_source[AES_128_KEY_SIZE]; ///< CardInfo area key used in retail units. Obfuscated using the above KEK source and SMC AES engine keydata. const u8 gc_cardinfo_key_dev_source[AES_128_KEY_SIZE]; ///< CardInfo area key used in development units. Obfuscated using the above KEK source and SMC AES engine keydata. u8 gc_cardinfo_kek_sealed[AES_128_KEY_SIZE]; ///< Generated from gc_cardinfo_kek_source. Sealed by the SMC AES engine. u8 gc_cardinfo_key_prod[AES_128_KEY_SIZE]; ///< Generated from gc_cardinfo_kek_sealed and gc_cardinfo_key_prod_source. u8 gc_cardinfo_key_dev[AES_128_KEY_SIZE]; ///< Generated from gc_cardinfo_kek_sealed and gc_cardinfo_key_dev_source. } KeysGameCardKeyset; /// Used to parse the eTicket RSA device key retrieved from PRODINFO via setcalGetEticketDeviceKey(). /// Everything after the AES CTR is encrypted using the eTicket RSA device key encryption key. typedef struct { u8 ctr[AES_128_KEY_SIZE]; u8 private_exponent[RSA2048_BYTES]; u8 modulus[RSA2048_BYTES]; u32 public_exponent; ///< Stored using big endian byte order. Must match ETICKET_RSA_DEVICE_KEY_PUBLIC_EXPONENT. u8 padding[0x14]; u64 device_id; u8 ghash[0x10]; } EticketRsaDeviceKey; NXDT_ASSERT(EticketRsaDeviceKey, 0x240); /* Function prototypes. */ static bool keysIsProductionModulus1xMandatory(void); static bool keysIsProductionModulus9xMandatory(void); static bool keysIsDevelopmentModulus1xMandatory(void); static bool keysIsDevelopmentModulus9xMandatory(void); static bool keysRetrieveKeysFromProgramMemory(KeysMemoryInfo *info); static bool keysDeriveNcaHeaderKey(void); static bool keysDeriveSealedNcaKeyAreaEncryptionKeys(void); static int keysGetKeyAndValueFromFile(FILE *f, char **key, char **value); static char keysConvertHexCharToBinary(char c); static bool keysParseHexKey(u8 *out, const char *key, const char *value, u32 size); static bool keysReadKeysFromFile(void); static bool keysGetDecryptedEticketRsaDeviceKey(void); static bool keysTestEticketRsaDeviceKey(const void *e, const void *d, const void *n); static bool keysDeriveGameCardKeys(void); /* Global variables. */ static KeysNcaKeyset g_ncaKeyset = {0}; static KeysGameCardKeyset g_gameCardKeyset = { .gc_cardinfo_kek_source = { 0xDE, 0xC6, 0x3F, 0x6A, 0xBF, 0x37, 0x72, 0x0B, 0x7E, 0x54, 0x67, 0x6A, 0x2D, 0xEF, 0xDD, 0x97 }, .gc_cardinfo_key_prod_source = { 0xF4, 0x92, 0x06, 0x52, 0xD6, 0x37, 0x70, 0xAF, 0xB1, 0x9C, 0x6F, 0x63, 0x09, 0x01, 0xF6, 0x29 }, .gc_cardinfo_key_dev_source = { 0x0B, 0x7D, 0xBB, 0x2C, 0xCF, 0x64, 0x1A, 0xF4, 0xD7, 0x38, 0x81, 0x3F, 0x0C, 0x33, 0xF4, 0x1C }, .gc_cardinfo_kek_sealed = {0}, .gc_cardinfo_key_prod = {0}, .gc_cardinfo_key_dev = {0} }; static bool g_keysetLoaded = false; static Mutex g_keysetMutex = 0; static SetCalRsa2048DeviceKey g_eTicketRsaDeviceKey = {0}; static KeysMemoryInfo g_fsRodataMemoryInfo = { .location = { .program_id = FS_SYSMODULE_TID, .mask = MemoryProgramSegmentType_Rodata, .data = NULL, .data_size = 0 }, .key_count = 8, .keys = { { .name = "nca_header_kek_source", .hash = { 0x18, 0x88, 0xCA, 0xED, 0x55, 0x51, 0xB3, 0xED, 0xE0, 0x14, 0x99, 0xE8, 0x7C, 0xE0, 0xD8, 0x68, 0x27, 0xF8, 0x08, 0x20, 0xEF, 0xB2, 0x75, 0x92, 0x10, 0x55, 0xAA, 0x4E, 0x2A, 0xBD, 0xFF, 0xC2 }, .size = sizeof(g_ncaKeyset.nca_header_kek_source), .dst = g_ncaKeyset.nca_header_kek_source, .mandatory_func = NULL }, { .name = "nca_main_signature_modulus_prod_00", .hash = { 0xF9, 0x2E, 0x84, 0x98, 0x17, 0x2C, 0xAF, 0x9C, 0x20, 0xE3, 0xF1, 0xF7, 0xD3, 0xE7, 0x2C, 0x62, 0x50, 0xA9, 0x40, 0x7A, 0xE7, 0x84, 0xE0, 0x03, 0x58, 0x07, 0x85, 0xA5, 0x68, 0x0B, 0x80, 0x33 }, .size = sizeof(g_ncaKeyset.nca_main_signature_moduli_prod[NcaMainSignatureKeyGeneration_Since100NUP]), .dst = g_ncaKeyset.nca_main_signature_moduli_prod[NcaMainSignatureKeyGeneration_Since100NUP], .mandatory_func = &keysIsProductionModulus1xMandatory }, { .name = "nca_main_signature_modulus_prod_01", .hash = { 0x5F, 0x6B, 0xE3, 0x1C, 0x31, 0x6E, 0x7C, 0xB2, 0x1C, 0xA7, 0xB9, 0xA1, 0x70, 0x6A, 0x9D, 0x58, 0x04, 0xEB, 0x90, 0x53, 0x72, 0xEF, 0xCB, 0x56, 0xD1, 0x93, 0xF2, 0xAF, 0x9E, 0x8A, 0xD1, 0xFA }, .size = sizeof(g_ncaKeyset.nca_main_signature_moduli_prod[NcaMainSignatureKeyGeneration_Since900NUP]), .dst = g_ncaKeyset.nca_main_signature_moduli_prod[NcaMainSignatureKeyGeneration_Since900NUP], .mandatory_func = &keysIsProductionModulus9xMandatory }, { .name = "nca_main_signature_modulus_dev_00", .hash = { 0x50, 0xF8, 0x26, 0xBB, 0x13, 0xFE, 0xB2, 0x6D, 0x83, 0xCF, 0xFF, 0xD8, 0x38, 0x45, 0xC3, 0x51, 0x4D, 0xCB, 0x06, 0x91, 0x83, 0x52, 0x06, 0x35, 0x7A, 0xC1, 0xDA, 0x6B, 0xF1, 0x60, 0x9F, 0x18 }, .size = sizeof(g_ncaKeyset.nca_main_signature_moduli_dev[NcaMainSignatureKeyGeneration_Since100NUP]), .dst = g_ncaKeyset.nca_main_signature_moduli_dev[NcaMainSignatureKeyGeneration_Since100NUP], .mandatory_func = &keysIsDevelopmentModulus1xMandatory }, { .name = "nca_main_signature_modulus_dev_01", .hash = { 0x56, 0xF5, 0x06, 0xEF, 0x8E, 0xCA, 0x2A, 0x29, 0x6F, 0x65, 0x45, 0xE1, 0x87, 0x60, 0x01, 0x11, 0xBC, 0xC7, 0x38, 0x56, 0x99, 0x16, 0xAD, 0xA5, 0xDD, 0x89, 0xF2, 0xE9, 0xAB, 0x28, 0x5B, 0x18 }, .size = sizeof(g_ncaKeyset.nca_main_signature_moduli_dev[NcaMainSignatureKeyGeneration_Since900NUP]), .dst = g_ncaKeyset.nca_main_signature_moduli_dev[NcaMainSignatureKeyGeneration_Since900NUP], .mandatory_func = &keysIsDevelopmentModulus9xMandatory }, { .name = "nca_kaek_application_source", .hash = { 0x04, 0xAD, 0x66, 0x14, 0x3C, 0x72, 0x6B, 0x2A, 0x13, 0x9F, 0xB6, 0xB2, 0x11, 0x28, 0xB4, 0x6F, 0x56, 0xC5, 0x53, 0xB2, 0xB3, 0x88, 0x71, 0x10, 0x30, 0x42, 0x98, 0xD8, 0xD0, 0x09, 0x2D, 0x9E }, .size = sizeof(g_ncaKeyset.nca_kaek_sources[NcaKeyAreaEncryptionKeyIndex_Application]), .dst = g_ncaKeyset.nca_kaek_sources[NcaKeyAreaEncryptionKeyIndex_Application], .mandatory_func = NULL }, { .name = "nca_kaek_ocean_source", .hash = { 0xFD, 0x43, 0x40, 0x00, 0xC8, 0xFF, 0x2B, 0x26, 0xF8, 0xE9, 0xA9, 0xD2, 0xD2, 0xC1, 0x2F, 0x6B, 0xE5, 0x77, 0x3C, 0xBB, 0x9D, 0xC8, 0x63, 0x00, 0xE1, 0xBD, 0x99, 0xF8, 0xEA, 0x33, 0xA4, 0x17 }, .size = sizeof(g_ncaKeyset.nca_kaek_sources[NcaKeyAreaEncryptionKeyIndex_Ocean]), .dst = g_ncaKeyset.nca_kaek_sources[NcaKeyAreaEncryptionKeyIndex_Ocean], .mandatory_func = NULL }, { .name = "nca_kaek_system_source", .hash = { 0x1F, 0x17, 0xB1, 0xFD, 0x51, 0xAD, 0x1C, 0x23, 0x79, 0xB5, 0x8F, 0x15, 0x2C, 0xA4, 0x91, 0x2E, 0xC2, 0x10, 0x64, 0x41, 0xE5, 0x17, 0x22, 0xF3, 0x87, 0x00, 0xD5, 0x93, 0x7A, 0x11, 0x62, 0xF7 }, .size = sizeof(g_ncaKeyset.nca_kaek_sources[NcaKeyAreaEncryptionKeyIndex_System]), .dst = g_ncaKeyset.nca_kaek_sources[NcaKeyAreaEncryptionKeyIndex_System], .mandatory_func = NULL } } }; static KeysMemoryInfo g_fsDataMemoryInfo = { .location = { .program_id = FS_SYSMODULE_TID, .mask = MemoryProgramSegmentType_Data, .data = NULL, .data_size = 0 }, .key_count = 1, .keys = { { .name = "nca_header_key_source", .hash = { 0x8F, 0x78, 0x3E, 0x46, 0x85, 0x2D, 0xF6, 0xBE, 0x0B, 0xA4, 0xE1, 0x92, 0x73, 0xC4, 0xAD, 0xBA, 0xEE, 0x16, 0x38, 0x00, 0x43, 0xE1, 0xB8, 0xC4, 0x18, 0xC4, 0x08, 0x9A, 0x8B, 0xD6, 0x4A, 0xA6 }, .size = sizeof(g_ncaKeyset.nca_header_key_source), .dst = g_ncaKeyset.nca_header_key_source, .mandatory_func = NULL } } }; bool keysLoadKeyset(void) { bool ret = false; SCOPED_LOCK(&g_keysetMutex) { ret = g_keysetLoaded; if (ret) break; /* Retrieve FS .rodata keys. */ if (!keysRetrieveKeysFromProgramMemory(&g_fsRodataMemoryInfo)) { LOG_MSG("Unable to retrieve keys from FS .rodata segment!"); break; } /* Retrieve FS .data keys. */ if (!keysRetrieveKeysFromProgramMemory(&g_fsDataMemoryInfo)) { LOG_MSG("Unable to retrieve keys from FS .data segment!"); break; } /* Derive NCA header key. */ if (!keysDeriveNcaHeaderKey()) { LOG_MSG("Unable to derive NCA header key!"); break; } /* Derive sealed NCA KAEKs. */ if (!keysDeriveSealedNcaKeyAreaEncryptionKeys()) { LOG_MSG("Unable to derive sealed NCA KAEKs!"); break; } /* Read additional keys from the keys file. */ if (!keysReadKeysFromFile()) break; /* Get decrypted eTicket RSA device key. */ if (!keysGetDecryptedEticketRsaDeviceKey()) break; /* Derive gamecard keys. */ if (!keysDeriveGameCardKeys()) break; /* Update flags. */ ret = g_keysetLoaded = true; } /*if (ret) { LOG_DATA(&g_ncaKeyset, sizeof(KeysNcaKeyset), "NCA keyset dump:"); LOG_DATA(&g_eTicketRsaDeviceKey, sizeof(SetCalRsa2048DeviceKey), "eTicket RSA device key dump:"); LOG_DATA(&g_gameCardKeyset, sizeof(KeysGameCardKeyset), "Gamecard keyset dump:"); }*/ return ret; } const u8 *keysGetNcaHeaderKey(void) { const u8 *ret = NULL; SCOPED_LOCK(&g_keysetMutex) { if (g_keysetLoaded) ret = (const u8*)(g_ncaKeyset.nca_header_key); } return ret; } const u8 *keysGetNcaMainSignatureModulus(u8 key_generation) { if (key_generation > NcaMainSignatureKeyGeneration_Current) { LOG_MSG("Invalid key generation value! (0x%02X).", key_generation); return NULL; } bool dev_unit = utilsIsDevelopmentUnit(); const u8 *ret = NULL, null_modulus[RSA2048_PUBKEY_SIZE] = {0}; SCOPED_LOCK(&g_keysetMutex) { if (!g_keysetLoaded) break; ret = (const u8*)(dev_unit ? g_ncaKeyset.nca_main_signature_moduli_dev[key_generation] : g_ncaKeyset.nca_main_signature_moduli_prod[key_generation]); if (!memcmp(ret, null_modulus, RSA2048_PUBKEY_SIZE)) { LOG_MSG("%s NCA header main signature modulus 0x%02X unavailable.", dev_unit ? "Development" : "Retail", key_generation); ret = NULL; } } return ret; } bool keysDecryptNcaKeyAreaEntry(u8 kaek_index, u8 key_generation, void *dst, const void *src) { bool ret = false; u8 key_gen_val = (key_generation ? (key_generation - 1) : key_generation); if (kaek_index >= NcaKeyAreaEncryptionKeyIndex_Count) { LOG_MSG("Invalid KAEK index! (0x%02X).", kaek_index); goto end; } if (key_gen_val >= NcaKeyGeneration_Max) { LOG_MSG("Invalid key generation value! (0x%02X).", key_gen_val); goto end; } if (!dst || !src) { LOG_MSG("Invalid destination/source pointer."); goto end; } SCOPED_LOCK(&g_keysetMutex) { if (!g_keysetLoaded) break; Result rc = splCryptoGenerateAesKey(g_ncaKeyset.nca_kaek_sealed[kaek_index][key_gen_val], src, dst); if (!(ret = R_SUCCEEDED(rc))) LOG_MSG("splCryptoGenerateAesKey failed! (0x%08X).", rc); } end: return ret; } const u8 *keysGetNcaKeyAreaEncryptionKey(u8 kaek_index, u8 key_generation) { const u8 *ret = NULL; u8 key_gen_val = (key_generation ? (key_generation - 1) : key_generation); if (kaek_index >= NcaKeyAreaEncryptionKeyIndex_Count) { LOG_MSG("Invalid KAEK index! (0x%02X).", kaek_index); goto end; } if (key_gen_val >= NcaKeyGeneration_Max) { LOG_MSG("Invalid key generation value! (0x%02X).", key_gen_val); goto end; } SCOPED_LOCK(&g_keysetMutex) { if (g_keysetLoaded) ret = (const u8*)(g_ncaKeyset.nca_kaek[kaek_index][key_gen_val]); } end: return ret; } bool keysDecryptRsaOaepWrappedTitleKey(const void *rsa_wrapped_titlekey, void *out_titlekey) { if (!rsa_wrapped_titlekey || !out_titlekey) { LOG_MSG("Invalid parameters!"); return false; } bool ret = false; SCOPED_LOCK(&g_keysetMutex) { if (!g_keysetLoaded) break; size_t out_keydata_size = 0; u8 out_keydata[RSA2048_BYTES] = {0}; /* Get eTicket RSA device key. */ EticketRsaDeviceKey *eticket_rsa_key = (EticketRsaDeviceKey*)g_eTicketRsaDeviceKey.key; /* Perform a RSA-OAEP unwrap operation to get the encrypted titlekey. */ /* ES uses a NULL string as the label. */ ret = (rsa2048OaepDecrypt(out_keydata, sizeof(out_keydata), rsa_wrapped_titlekey, eticket_rsa_key->modulus, &(eticket_rsa_key->public_exponent), sizeof(eticket_rsa_key->public_exponent), \ eticket_rsa_key->private_exponent, sizeof(eticket_rsa_key->private_exponent), NULL, 0, &out_keydata_size) && out_keydata_size >= AES_128_KEY_SIZE); if (ret) { /* Copy RSA-OAEP unwrapped titlekey. */ memcpy(out_titlekey, out_keydata, AES_128_KEY_SIZE); } else { LOG_MSG("RSA-OAEP titlekey decryption failed!"); } } return ret; } const u8 *keysGetTicketCommonKey(u8 key_generation) { const u8 *ret = NULL; u8 key_gen_val = (key_generation ? (key_generation - 1) : key_generation); if (key_gen_val >= NcaKeyGeneration_Max) { LOG_MSG("Invalid key generation value! (0x%02X).", key_gen_val); goto end; } SCOPED_LOCK(&g_keysetMutex) { if (g_keysetLoaded) ret = (const u8*)(g_ncaKeyset.ticket_common_keys[key_gen_val]); } end: return ret; } const u8 *keysGetGameCardInfoKey(void) { const u8 *ret = NULL; SCOPED_LOCK(&g_keysetMutex) { if (g_keysetLoaded) ret = (const u8*)(utilsIsDevelopmentUnit() ? g_gameCardKeyset.gc_cardinfo_key_dev : g_gameCardKeyset.gc_cardinfo_key_prod); } return ret; } static bool keysIsProductionModulus1xMandatory(void) { return !utilsIsDevelopmentUnit(); } static bool keysIsProductionModulus9xMandatory(void) { return (!utilsIsDevelopmentUnit() && hosversionAtLeast(9, 0, 0)); } static bool keysIsDevelopmentModulus1xMandatory(void) { return utilsIsDevelopmentUnit(); } static bool keysIsDevelopmentModulus9xMandatory(void) { return (utilsIsDevelopmentUnit() && hosversionAtLeast(9, 0, 0)); } static bool keysRetrieveKeysFromProgramMemory(KeysMemoryInfo *info) { if (!info || !info->key_count) { LOG_MSG("Invalid parameters!"); return false; } u8 tmp_hash[SHA256_HASH_SIZE]; bool success = false; if (!memRetrieveProgramMemorySegment(&(info->location))) return false; for(u32 i = 0; i < info->key_count; i++) { KeysMemoryKey *key = &(info->keys[i]); bool found = false, mandatory = (key->mandatory_func != NULL ? key->mandatory_func() : true); if (!key->dst) { LOG_MSG("Invalid destination pointer for key \"%s\" in program %016lX!", key->name, info->location.program_id); if (mandatory) goto end; } /* Hash every key length-sized byte chunk in the process memory buffer until a match is found. */ for(u64 j = 0; j < info->location.data_size; j++) { if ((info->location.data_size - j) < key->size) break; sha256CalculateHash(tmp_hash, info->location.data + j, key->size); if (!memcmp(tmp_hash, key->hash, SHA256_HASH_SIZE)) { /* Jackpot. */ memcpy(key->dst, info->location.data + j, key->size); found = true; break; } } if (!found) { LOG_MSG("Unable to locate key \"%s\" in process memory from program %016lX!", key->name, info->location.program_id); if (mandatory) goto end; } } success = true; end: memFreeMemoryLocation(&(info->location)); return success; } static bool keysDeriveNcaHeaderKey(void) { Result rc = 0; /* Derive nca_header_kek_sealed from nca_header_kek_source. */ rc = splCryptoGenerateAesKek(g_ncaKeyset.nca_header_kek_source, 0, 0, g_ncaKeyset.nca_header_kek_sealed); if (R_FAILED(rc)) { LOG_MSG("splCryptoGenerateAesKek failed! (0x%08X) (nca_header_kek_sealed).", rc); return false; } /* Derive nca_header_key from nca_header_kek_sealed and nca_header_key_source. */ rc = splCryptoGenerateAesKey(g_ncaKeyset.nca_header_kek_sealed, g_ncaKeyset.nca_header_key_source, g_ncaKeyset.nca_header_key); if (R_FAILED(rc)) { LOG_MSG("splCryptoGenerateAesKey failed! (0x%08X) (nca_header_key, part 1).", rc); return false; } rc = splCryptoGenerateAesKey(g_ncaKeyset.nca_header_kek_sealed, g_ncaKeyset.nca_header_key_source + AES_128_KEY_SIZE, g_ncaKeyset.nca_header_key + AES_128_KEY_SIZE); if (R_FAILED(rc)) { LOG_MSG("splCryptoGenerateAesKey failed! (0x%08X) (nca_header_key, part 2).", rc); return false; } return true; } static bool keysDeriveSealedNcaKeyAreaEncryptionKeys(void) { Result rc = 0; u32 key_cnt = 0; u8 highest_key_gen = 0; bool success = false; for(u8 i = 0; i < NcaKeyAreaEncryptionKeyIndex_Count; i++) { /* Get pointer to current KAEK source. */ const u8 *nca_kaek_source = (const u8*)(g_ncaKeyset.nca_kaek_sources[i]); for(u8 j = 1; j <= NcaKeyGeneration_Max; j++) { /* Get pointer to current sealed KAEK. */ u8 key_gen_val = (j - 1); u8 *nca_kaek_sealed = g_ncaKeyset.nca_kaek_sealed[i][key_gen_val]; /* Derive sealed KAEK using the current KAEK source and key generation. */ rc = splCryptoGenerateAesKek(nca_kaek_source, j, 0, nca_kaek_sealed); if (R_FAILED(rc)) { //LOG_MSG("splCryptoGenerateAesKek failed for KAEK index %u and key generation %u! (0x%08X).", i, (j <= 1 ? 0 : j), rc); break; } /* Update derived key count and highest key generation value. */ key_cnt++; if (key_gen_val > highest_key_gen) highest_key_gen = key_gen_val; } } success = (key_cnt > 0); if (success) LOG_MSG("Derived %u sealed NCA KAEK(s) (%u key generation[s]).", key_cnt, highest_key_gen + 1); return success; } /** * Reads a line from file f and parses out the key and value from it. * The format of a line must match /^ *[A-Za-z0-9_] *[,=] *.+$/. * If a line ends in \r, the final \r is stripped. * The input file is assumed to have been opened with the 'b' flag. * The input file is assumed to contain only ASCII. * * A line cannot exceed 512 bytes in length. * Lines that are excessively long will be silently truncated. * * On success, *key and *value will be set to point to the key and value in * the input line, respectively. * *key and *value may also be NULL in case of empty lines. * On failure, *key and *value will be set to NULL. * End of file is considered failure. * * Because *key and *value will point to a static buffer, their contents must be * copied before calling this function again. * For the same reason, this function is not thread-safe. * * The key will be converted to lowercase. * An empty key is considered a parse error, but an empty value is returned as * success. * * This function assumes that the file can be trusted not to contain any NUL in * the contents. * * Whitespace (' ', ASCII 0x20, as well as '\t', ASCII 0x09) at the beginning of * the line, at the end of the line as well as around = (or ,) will be ignored. * * @param f the file to read * @param key pointer to change to point to the key * @param value pointer to change to point to the value * @return 0 on success, * 1 on end of file, * -1 on parse error (line too long, line malformed) * -2 on I/O error */ static int keysGetKeyAndValueFromFile(FILE *f, char **key, char **value) { if (!f || !key || !value) { LOG_MSG("Invalid parameters!"); return -2; } #define SKIP_SPACE(p) do {\ for (; (*p == ' ' || *p == '\t'); ++p);\ } while(0); static char line[512] = {0}; char *k, *v, *p, *end; *key = *value = NULL; errno = 0; if (fgets(line, (int)sizeof(line), f) == NULL) { if (feof(f)) { return 1; } else { return -2; } } if (errno != 0) return -2; if (*line == '\n' || *line == '\r' || *line == '\0') return 0; /* Not finding \r or \n is not a problem. * The line might just be exactly 512 characters long, we have no way to * tell. * Additionally, it's possible that the last line of a file is not actually * a line (i.e., does not end in '\n'); we do want to handle those. */ if ((p = strchr(line, '\r')) != NULL || (p = strchr(line, '\n')) != NULL) { end = p; *p = '\0'; } else { end = (line + strlen(line) + 1); } p = line; SKIP_SPACE(p); k = p; /* Validate key and convert to lower case. */ for (; *p != ' ' && *p != ',' && *p != '\t' && *p != '='; ++p) { if (*p == '\0') return -1; if (*p >= 'A' && *p <= 'Z') { *p = 'a' + (*p - 'A'); continue; } if (*p != '_' && (*p < '0' && *p > '9') && (*p < 'a' && *p > 'z')) return -1; } /* Bail if the final ++p put us at the end of string. */ if (*p == '\0') return -1; /* We should be at the end of key now and either whitespace or [,=] follows. */ if (*p == '=' || *p == ',') { *p++ = '\0'; } else { *p++ = '\0'; SKIP_SPACE(p); if (*p != '=' && *p != ',') return -1; *p++ = '\0'; } /* Empty key is an error. */ if (*k == '\0') return -1; SKIP_SPACE(p); v = p; /* Skip trailing whitespace. */ for (p = end - 1; *p == '\t' || *p == ' '; --p); *(p + 1) = '\0'; *key = k; *value = v; return 0; #undef SKIP_SPACE } static char keysConvertHexCharToBinary(char c) { if ('a' <= c && c <= 'f') return (c - 'a' + 0xA); if ('A' <= c && c <= 'F') return (c - 'A' + 0xA); if ('0' <= c && c <= '9') return (c - '0'); return 'z'; } static bool keysParseHexKey(u8 *out, const char *key, const char *value, u32 size) { u32 hex_str_len = (2 * size); size_t value_len = 0; if (!out || !key || !*key || !value || !(value_len = strlen(value)) || !size) { LOG_MSG("Invalid parameters!"); return false; } if (value_len != hex_str_len) { LOG_MSG("Key \"%s\" must be %u hex digits long!", key, hex_str_len); return false; } memset(out, 0, size); for(u32 i = 0; i < hex_str_len; i++) { char val = keysConvertHexCharToBinary(value[i]); if (val == 'z') { LOG_MSG("Invalid hex character in key \"%s\" at position %u!", key, i); return false; } if ((i & 1) == 0) val <<= 4; out[i >> 1] |= val; } return true; } static bool keysReadKeysFromFile(void) { int ret = 0; u32 key_count = 0; FILE *keys_file = NULL; char *key = NULL, *value = NULL; char test_name[0x40] = {0}; bool parse_fail = false, eticket_rsa_kek_available = false; keys_file = fopen(KEYS_FILE_PATH, "rb"); if (!keys_file) { LOG_MSG("Unable to open \"%s\" to retrieve keys!", KEYS_FILE_PATH); return false; } while(true) { ret = keysGetKeyAndValueFromFile(keys_file, &key, &value); if (ret == 1 || ret == -2) break; /* Break from the while loop if EOF is reached or if an I/O error occurs. */ /* Ignore malformed lines. */ if (ret != 0 || !key || !value) continue; if (!strcasecmp(key, "eticket_rsa_kek")) { if ((parse_fail = !keysParseHexKey(g_ncaKeyset.eticket_rsa_kek, key, value, sizeof(g_ncaKeyset.eticket_rsa_kek)))) break; eticket_rsa_kek_available = true; key_count++; } else if (!strcasecmp(key, "eticket_rsa_kek_personalized")) { /* This only appears on consoles that use the new PRODINFO key generation scheme. */ if ((parse_fail = !keysParseHexKey(g_ncaKeyset.eticket_rsa_kek_personalized, key, value, sizeof(g_ncaKeyset.eticket_rsa_kek_personalized)))) break; eticket_rsa_kek_available = true; key_count++; } else { for(u32 i = 0; i < NcaKeyGeneration_Max; i++) { snprintf(test_name, sizeof(test_name), "titlekek_%02x", i); if (!strcasecmp(key, test_name)) { if ((parse_fail = !keysParseHexKey(g_ncaKeyset.ticket_common_keys[i], key, value, sizeof(g_ncaKeyset.ticket_common_keys[i])))) break; key_count++; break; } snprintf(test_name, sizeof(test_name), "key_area_key_application_%02x", i); if (!strcasecmp(key, test_name)) { if ((parse_fail = !keysParseHexKey(g_ncaKeyset.nca_kaek[NcaKeyAreaEncryptionKeyIndex_Application][i], key, value, \ sizeof(g_ncaKeyset.nca_kaek[NcaKeyAreaEncryptionKeyIndex_Application][i])))) break; key_count++; break; } snprintf(test_name, sizeof(test_name), "key_area_key_ocean_%02x", i); if (!strcasecmp(key, test_name)) { if ((parse_fail = !keysParseHexKey(g_ncaKeyset.nca_kaek[NcaKeyAreaEncryptionKeyIndex_Ocean][i], key, value, \ sizeof(g_ncaKeyset.nca_kaek[NcaKeyAreaEncryptionKeyIndex_Ocean][i])))) break; key_count++; break; } snprintf(test_name, sizeof(test_name), "key_area_key_system_%02x", i); if (!strcasecmp(key, test_name)) { if ((parse_fail = !keysParseHexKey(g_ncaKeyset.nca_kaek[NcaKeyAreaEncryptionKeyIndex_System][i], key, value, \ sizeof(g_ncaKeyset.nca_kaek[NcaKeyAreaEncryptionKeyIndex_System][i])))) break; key_count++; break; } } if (parse_fail) break; } } fclose(keys_file); if (parse_fail || !key_count) { if (!key_count) LOG_MSG("Unable to parse necessary keys from \"%s\"! (keys file empty?).", KEYS_FILE_PATH); return false; } if (!eticket_rsa_kek_available) { LOG_MSG("\"eticket_rsa_kek\" unavailable in \"%s\"!", KEYS_FILE_PATH); return false; } return true; } static bool keysGetDecryptedEticketRsaDeviceKey(void) { Result rc = 0; u32 public_exponent = 0; const u8 *eticket_rsa_kek = NULL; EticketRsaDeviceKey *eticket_rsa_key = NULL; Aes128CtrContext eticket_aes_ctx = {0}; /* Get eTicket RSA device key. */ rc = setcalGetEticketDeviceKey(&g_eTicketRsaDeviceKey); if (R_FAILED(rc)) { LOG_MSG("setcalGetEticketDeviceKey failed! (0x%08X).", rc); return false; } /* Get eTicket RSA device key encryption key. */ eticket_rsa_kek = (const u8*)(g_eTicketRsaDeviceKey.generation > 0 ? g_ncaKeyset.eticket_rsa_kek_personalized : g_ncaKeyset.eticket_rsa_kek); /* Decrypt eTicket RSA device key. */ eticket_rsa_key = (EticketRsaDeviceKey*)g_eTicketRsaDeviceKey.key; aes128CtrContextCreate(&eticket_aes_ctx, eticket_rsa_kek, eticket_rsa_key->ctr); aes128CtrCrypt(&eticket_aes_ctx, &(eticket_rsa_key->private_exponent), &(eticket_rsa_key->private_exponent), sizeof(EticketRsaDeviceKey) - sizeof(eticket_rsa_key->ctr)); /* Public exponent value must be 0x10001. */ /* It is stored using big endian byte order. */ public_exponent = __builtin_bswap32(eticket_rsa_key->public_exponent); if (public_exponent != ETICKET_RSA_DEVICE_KEY_PUBLIC_EXPONENT) { LOG_MSG("Invalid public exponent for decrypted eTicket RSA device key! Wrong keys? (0x%08X).", public_exponent); return false; } /* Test RSA key pair. */ if (!keysTestEticketRsaDeviceKey(&(eticket_rsa_key->public_exponent), eticket_rsa_key->private_exponent, eticket_rsa_key->modulus)) { LOG_MSG("eTicket RSA device key test failed! Wrong keys?"); return false; } return true; } static bool keysTestEticketRsaDeviceKey(const void *e, const void *d, const void *n) { if (!e || !d || !n) { LOG_MSG("Invalid parameters!"); return false; } Result rc = 0; u8 x[RSA2048_BYTES] = {0}, y[RSA2048_BYTES] = {0}, z[RSA2048_BYTES] = {0}; /* 0xCAFEBABE. */ x[0xFC] = 0xCA; x[0xFD] = 0xFE; x[0xFE] = 0xBA; x[0xFF] = 0xBE; rc = splUserExpMod(x, n, d, RSA2048_BYTES, y); if (R_FAILED(rc)) { LOG_MSG("splUserExpMod failed! (#1) (0x%08X).", rc); return false; } rc = splUserExpMod(y, n, e, 4, z); if (R_FAILED(rc)) { LOG_MSG("splUserExpMod failed! (#2) (0x%08X).", rc); return false; } if (memcmp(x, z, RSA2048_BYTES) != 0) { LOG_MSG("Invalid RSA key pair!"); return false; } return true; } static bool keysDeriveGameCardKeys(void) { Result rc = 0; /* Derive gc_cardinfo_kek_sealed from gc_cardinfo_kek_source. */ rc = splCryptoGenerateAesKek(g_gameCardKeyset.gc_cardinfo_kek_source, 0, 0, g_gameCardKeyset.gc_cardinfo_kek_sealed); if (R_FAILED(rc)) { LOG_MSG("splCryptoGenerateAesKek failed! (0x%08X) (gc_cardinfo_kek_sealed).", rc); return false; } /* Derive gc_cardinfo_key_prod from gc_cardinfo_kek_sealed and gc_cardinfo_key_prod_source. */ rc = splCryptoGenerateAesKey(g_gameCardKeyset.gc_cardinfo_kek_sealed, g_gameCardKeyset.gc_cardinfo_key_prod_source, g_gameCardKeyset.gc_cardinfo_key_prod); if (R_FAILED(rc)) { LOG_MSG("splCryptoGenerateAesKey failed! (0x%08X) (gc_cardinfo_key_prod).", rc); return false; } /* Derive gc_cardinfo_key_dev from gc_cardinfo_kek_sealed and gc_cardinfo_key_dev_source. */ rc = splCryptoGenerateAesKey(g_gameCardKeyset.gc_cardinfo_kek_sealed, g_gameCardKeyset.gc_cardinfo_key_dev_source, g_gameCardKeyset.gc_cardinfo_key_dev); if (R_FAILED(rc)) { LOG_MSG("splCryptoGenerateAesKey failed! (0x%08X) (gc_cardinfo_key_dev).", rc); return false; } return true; }