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
|
// Copyright 2018 yuzu emulator team
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include "core/crypto/aes_util.h"
#include "mbedtls/cipher.h"
namespace Core::Crypto {
static_assert(static_cast<size_t>(Mode::CTR) == static_cast<size_t>(MBEDTLS_CIPHER_AES_128_CTR), "CTR mode is incorrect.");
static_assert(static_cast<size_t>(Mode::ECB) == static_cast<size_t>(MBEDTLS_CIPHER_AES_128_ECB), "ECB mode is incorrect.");
static_assert(static_cast<size_t>(Mode::XTS) == static_cast<size_t>(MBEDTLS_CIPHER_AES_128_XTS), "XTS mode is incorrect.");
template<typename Key, size_t KeySize>
Crypto::AESCipher<Key, KeySize>::AESCipher(Key key, Mode mode) {
mbedtls_cipher_init(encryption_context.get());
mbedtls_cipher_init(decryption_context.get());
ASSERT_MSG((mbedtls_cipher_setup(
encryption_context.get(),
mbedtls_cipher_info_from_type(static_cast<mbedtls_cipher_type_t>(mode))) ||
mbedtls_cipher_setup(decryption_context.get(),
mbedtls_cipher_info_from_type(
static_cast<mbedtls_cipher_type_t>(mode)))) == 0,
"Failed to initialize mbedtls ciphers.");
ASSERT(
!mbedtls_cipher_setkey(encryption_context.get(), key.data(), KeySize * 8, MBEDTLS_ENCRYPT));
ASSERT(
!mbedtls_cipher_setkey(decryption_context.get(), key.data(), KeySize * 8, MBEDTLS_DECRYPT));
//"Failed to set key on mbedtls ciphers.");
}
template<typename Key, size_t KeySize>
AESCipher<Key, KeySize>::~AESCipher() {
mbedtls_cipher_free(encryption_context.get());
mbedtls_cipher_free(decryption_context.get());
}
template<typename Key, size_t KeySize>
void AESCipher<Key, KeySize>::SetIV(std::vector<u8> iv) {
ASSERT_MSG((mbedtls_cipher_set_iv(encryption_context.get(), iv.data(), iv.size()) ||
mbedtls_cipher_set_iv(decryption_context.get(), iv.data(), iv.size())) == 0,
"Failed to set IV on mbedtls ciphers.");
}
template<typename Key, size_t KeySize>
void AESCipher<Key, KeySize>::Transcode(const u8* src, size_t size, u8* dest, Op op) {
size_t written = 0;
const auto context = op == Op::Encrypt ? encryption_context.get() : decryption_context.get();
mbedtls_cipher_reset(context);
if (mbedtls_cipher_get_cipher_mode(context) == MBEDTLS_MODE_XTS) {
mbedtls_cipher_update(context, src, size,
dest, &written);
if (written != size)
LOG_WARNING(Crypto, "Not all data was decrypted requested={:016X}, actual={:016X}.",
size, written);
} else {
const auto block_size = mbedtls_cipher_get_block_size(context);
for (size_t offset = 0; offset < size; offset += block_size) {
auto length = std::min<size_t>(block_size, size - offset);
mbedtls_cipher_update(context, src + offset, length,
dest + offset, &written);
if (written != length)
LOG_WARNING(Crypto,
"Not all data was decrypted requested={:016X}, actual={:016X}.",
length, written);
}
}
mbedtls_cipher_finish(context, nullptr, nullptr);
}
template<typename Key, size_t KeySize>
void AESCipher<Key, KeySize>::XTSTranscode(const u8* src, size_t size, u8* dest, size_t sector_id, size_t sector_size,
Op op) {
if (size % sector_size > 0) {
LOG_CRITICAL(Crypto, "Data size must be a multiple of sector size.");
return;
}
for (size_t i = 0; i < size; i += sector_size) {
SetIV(CalculateNintendoTweak(sector_id++));
Transcode<u8, u8>(src + i, sector_size,
dest + i, op);
}
}
template<typename Key, size_t KeySize>
std::vector<u8> AESCipher<Key, KeySize>::CalculateNintendoTweak(size_t sector_id) {
std::vector<u8> out(0x10);
for (size_t i = 0xF; i <= 0xF; --i) {
out[i] = sector_id & 0xFF;
sector_id >>= 8;
}
return out;
}
template class AESCipher<Key128>;
template class AESCipher<Key256>;
}
|
