summaryrefslogtreecommitdiffstats
path: root/src/core/crypto/key_manager.h
blob: bdca3770a02da1dcc419ba9b6c36c37ae25ac93c (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
// Copyright 2018 yuzu emulator team
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.

#pragma once

#include <array>
#include <map>
#include <optional>
#include <string>

#include <variant>
#include <boost/container/flat_map.hpp>
#include <fmt/format.h>
#include "common/common_funcs.h"
#include "common/common_types.h"
#include "core/crypto/partition_data_manager.h"
#include "core/file_sys/vfs_types.h"

namespace Common::FS {
class IOFile;
}

namespace Loader {
enum class ResultStatus : u16;
}

namespace Core::Crypto {

constexpr u64 TICKET_FILE_TITLEKEY_OFFSET = 0x180;

using Key128 = std::array<u8, 0x10>;
using Key256 = std::array<u8, 0x20>;
using SHA256Hash = std::array<u8, 0x20>;

enum class SignatureType {
    RSA_4096_SHA1 = 0x10000,
    RSA_2048_SHA1 = 0x10001,
    ECDSA_SHA1 = 0x10002,
    RSA_4096_SHA256 = 0x10003,
    RSA_2048_SHA256 = 0x10004,
    ECDSA_SHA256 = 0x10005,
};

u64 GetSignatureTypeDataSize(SignatureType type);
u64 GetSignatureTypePaddingSize(SignatureType type);

enum class TitleKeyType : u8 {
    Common = 0,
    Personalized = 1,
};

struct TicketData {
    std::array<u8, 0x40> issuer;
    union {
        std::array<u8, 0x100> title_key_block;

        struct {
            Key128 title_key_common;
            std::array<u8, 0xF0> title_key_common_pad;
        };
    };

    INSERT_PADDING_BYTES(0x1);
    TitleKeyType type;
    INSERT_PADDING_BYTES(0x3);
    u8 revision;
    INSERT_PADDING_BYTES(0xA);
    u64 ticket_id;
    u64 device_id;
    std::array<u8, 0x10> rights_id;
    u32 account_id;
    INSERT_PADDING_BYTES(0x14C);
};
static_assert(sizeof(TicketData) == 0x2C0, "TicketData has incorrect size.");

struct RSA4096Ticket {
    SignatureType sig_type;
    std::array<u8, 0x200> sig_data;
    INSERT_PADDING_BYTES(0x3C);
    TicketData data;
};

struct RSA2048Ticket {
    SignatureType sig_type;
    std::array<u8, 0x100> sig_data;
    INSERT_PADDING_BYTES(0x3C);
    TicketData data;
};

struct ECDSATicket {
    SignatureType sig_type;
    std::array<u8, 0x3C> sig_data;
    INSERT_PADDING_BYTES(0x40);
    TicketData data;
};

struct Ticket {
    std::variant<RSA4096Ticket, RSA2048Ticket, ECDSATicket> data;

    SignatureType GetSignatureType() const;
    TicketData& GetData();
    const TicketData& GetData() const;
    u64 GetSize() const;

    static Ticket SynthesizeCommon(Key128 title_key, const std::array<u8, 0x10>& rights_id);
};

static_assert(sizeof(Key128) == 16, "Key128 must be 128 bytes big.");
static_assert(sizeof(Key256) == 32, "Key256 must be 256 bytes big.");

template <size_t bit_size, size_t byte_size = (bit_size >> 3)>
struct RSAKeyPair {
    std::array<u8, byte_size> encryption_key;
    std::array<u8, byte_size> decryption_key;
    std::array<u8, byte_size> modulus;
    std::array<u8, 4> exponent;
};

template <size_t bit_size, size_t byte_size>
bool operator==(const RSAKeyPair<bit_size, byte_size>& lhs,
                const RSAKeyPair<bit_size, byte_size>& rhs) {
    return std::tie(lhs.encryption_key, lhs.decryption_key, lhs.modulus, lhs.exponent) ==
           std::tie(rhs.encryption_key, rhs.decryption_key, rhs.modulus, rhs.exponent);
}

template <size_t bit_size, size_t byte_size>
bool operator!=(const RSAKeyPair<bit_size, byte_size>& lhs,
                const RSAKeyPair<bit_size, byte_size>& rhs) {
    return !(lhs == rhs);
}

enum class KeyCategory : u8 {
    Standard,
    Title,
    Console,
};

enum class S256KeyType : u64 {
    SDKey,        // f1=SDKeyType
    Header,       //
    SDKeySource,  // f1=SDKeyType
    HeaderSource, //
};

enum class S128KeyType : u64 {
    Master,        // f1=crypto revision
    Package1,      // f1=crypto revision
    Package2,      // f1=crypto revision
    Titlekek,      // f1=crypto revision
    ETicketRSAKek, //
    KeyArea,       // f1=crypto revision f2=type {app, ocean, system}
    SDSeed,        //
    Titlekey,      // f1=rights id LSB f2=rights id MSB
    Source,        // f1=source type, f2= sub id
    Keyblob,       // f1=crypto revision
    KeyblobMAC,    // f1=crypto revision
    TSEC,          //
    SecureBoot,    //
    BIS,           // f1=partition (0-3), f2=type {crypt, tweak}
    HeaderKek,     //
    SDKek,         //
    RSAKek,        //
};

enum class KeyAreaKeyType : u8 {
    Application,
    Ocean,
    System,
};

enum class SourceKeyType : u8 {
    SDKek,                //
    AESKekGeneration,     //
    AESKeyGeneration,     //
    RSAOaepKekGeneration, //
    Master,               //
    Keyblob,              // f2=crypto revision
    KeyAreaKey,           // f2=KeyAreaKeyType
    Titlekek,             //
    Package2,             //
    HeaderKek,            //
    KeyblobMAC,           //
    ETicketKek,           //
    ETicketKekek,         //
};

enum class SDKeyType : u8 {
    Save,
    NCA,
};

enum class BISKeyType : u8 {
    Crypto,
    Tweak,
};

enum class RSAKekType : u8 {
    Mask0,
    Seed3,
};

template <typename KeyType>
struct KeyIndex {
    KeyType type;
    u64 field1;
    u64 field2;

    std::string DebugInfo() const {
        u8 key_size = 16;
        if constexpr (std::is_same_v<KeyType, S256KeyType>)
            key_size = 32;
        return fmt::format("key_size={:02X}, key={:02X}, field1={:016X}, field2={:016X}", key_size,
                           static_cast<u8>(type), field1, field2);
    }
};

// boost flat_map requires operator< for O(log(n)) lookups.
template <typename KeyType>
bool operator<(const KeyIndex<KeyType>& lhs, const KeyIndex<KeyType>& rhs) {
    return std::tie(lhs.type, lhs.field1, lhs.field2) < std::tie(rhs.type, rhs.field1, rhs.field2);
}

class KeyManager {
public:
    static KeyManager& Instance() {
        static KeyManager instance;
        return instance;
    }

    KeyManager(const KeyManager&) = delete;
    KeyManager& operator=(const KeyManager&) = delete;

    KeyManager(KeyManager&&) = delete;
    KeyManager& operator=(KeyManager&&) = delete;

    bool HasKey(S128KeyType id, u64 field1 = 0, u64 field2 = 0) const;
    bool HasKey(S256KeyType id, u64 field1 = 0, u64 field2 = 0) const;

    Key128 GetKey(S128KeyType id, u64 field1 = 0, u64 field2 = 0) const;
    Key256 GetKey(S256KeyType id, u64 field1 = 0, u64 field2 = 0) const;

    Key256 GetBISKey(u8 partition_id) const;

    void SetKey(S128KeyType id, Key128 key, u64 field1 = 0, u64 field2 = 0);
    void SetKey(S256KeyType id, Key256 key, u64 field1 = 0, u64 field2 = 0);

    static bool KeyFileExists(bool title);

    // Call before using the sd seed to attempt to derive it if it dosen't exist. Needs system
    // save 8*43 and the private file to exist.
    void DeriveSDSeedLazy();

    bool BaseDeriveNecessary() const;
    void DeriveBase();
    void DeriveETicket(PartitionDataManager& data);
    void PopulateTickets();
    void SynthesizeTickets();

    void PopulateFromPartitionData(PartitionDataManager& data);

    const std::map<u128, Ticket>& GetCommonTickets() const;
    const std::map<u128, Ticket>& GetPersonalizedTickets() const;

    bool AddTicketCommon(Ticket raw);
    bool AddTicketPersonalized(Ticket raw);

private:
    KeyManager();

    std::map<KeyIndex<S128KeyType>, Key128> s128_keys;
    std::map<KeyIndex<S256KeyType>, Key256> s256_keys;

    // Map from rights ID to ticket
    std::map<u128, Ticket> common_tickets;
    std::map<u128, Ticket> personal_tickets;

    std::array<std::array<u8, 0xB0>, 0x20> encrypted_keyblobs{};
    std::array<std::array<u8, 0x90>, 0x20> keyblobs{};
    std::array<u8, 576> eticket_extended_kek{};

    bool dev_mode;
    void LoadFromFile(const std::string& filename, bool is_title_keys);
    void AttemptLoadKeyFile(const std::string& dir1, const std::string& dir2,
                            const std::string& filename, bool title);
    template <size_t Size>
    void WriteKeyToFile(KeyCategory category, std::string_view keyname,
                        const std::array<u8, Size>& key);

    void DeriveGeneralPurposeKeys(std::size_t crypto_revision);

    RSAKeyPair<2048> GetETicketRSAKey() const;

    void SetKeyWrapped(S128KeyType id, Key128 key, u64 field1 = 0, u64 field2 = 0);
    void SetKeyWrapped(S256KeyType id, Key256 key, u64 field1 = 0, u64 field2 = 0);

    static const boost::container::flat_map<std::string, KeyIndex<S128KeyType>> s128_file_id;
    static const boost::container::flat_map<std::string, KeyIndex<S256KeyType>> s256_file_id;
};

Key128 GenerateKeyEncryptionKey(Key128 source, Key128 master, Key128 kek_seed, Key128 key_seed);
Key128 DeriveKeyblobKey(const Key128& sbk, const Key128& tsec, Key128 source);
Key128 DeriveKeyblobMACKey(const Key128& keyblob_key, const Key128& mac_source);
Key128 DeriveMasterKey(const std::array<u8, 0x90>& keyblob, const Key128& master_source);
std::array<u8, 0x90> DecryptKeyblob(const std::array<u8, 0xB0>& encrypted_keyblob,
                                    const Key128& key);

std::optional<Key128> DeriveSDSeed();
Loader::ResultStatus DeriveSDKeys(std::array<Key256, 2>& sd_keys, KeyManager& keys);

std::vector<Ticket> GetTicketblob(const Common::FS::IOFile& ticket_save);

// Returns a pair of {rights_id, titlekey}. Fails if the ticket has no certificate authority
// (offset 0x140-0x144 is zero)
std::optional<std::pair<Key128, Key128>> ParseTicket(const Ticket& ticket,
                                                     const RSAKeyPair<2048>& eticket_extended_key);

} // namespace Core::Crypto