/src/botan/build/include/botan/internal/xts.h
Line | Count | Source (jump to first uncovered line) |
1 | | /* |
2 | | * XTS mode, from IEEE P1619 |
3 | | * (C) 2009,2013 Jack Lloyd |
4 | | * (C) 2016 Daniel Neus, Rohde & Schwarz Cybersecurity |
5 | | * |
6 | | * Botan is released under the Simplified BSD License (see license.txt) |
7 | | */ |
8 | | |
9 | | #ifndef BOTAN_MODE_XTS_H_ |
10 | | #define BOTAN_MODE_XTS_H_ |
11 | | |
12 | | #include <botan/cipher_mode.h> |
13 | | #include <botan/block_cipher.h> |
14 | | |
15 | | namespace Botan { |
16 | | |
17 | | /** |
18 | | * IEEE P1619 XTS Mode |
19 | | */ |
20 | | class XTS_Mode : public Cipher_Mode |
21 | | { |
22 | | public: |
23 | | std::string name() const override; |
24 | | |
25 | 0 | size_t update_granularity() const override { return m_cipher_parallelism; } |
26 | | |
27 | | size_t minimum_final_size() const override; |
28 | | |
29 | | Key_Length_Specification key_spec() const override; |
30 | | |
31 | | size_t default_nonce_length() const override; |
32 | | |
33 | | bool valid_nonce_length(size_t n) const override; |
34 | | |
35 | | void clear() override; |
36 | | |
37 | | void reset() override; |
38 | | |
39 | | protected: |
40 | | explicit XTS_Mode(BlockCipher* cipher); |
41 | | |
42 | 0 | const uint8_t* tweak() const { return m_tweak.data(); } |
43 | | |
44 | 0 | bool tweak_set() const { return m_tweak.empty() == false; } |
45 | | |
46 | 0 | const BlockCipher& cipher() const { return *m_cipher; } |
47 | | |
48 | | void update_tweak(size_t last_used); |
49 | | |
50 | 0 | size_t cipher_block_size() const { return m_cipher_block_size; } |
51 | | |
52 | | private: |
53 | | void start_msg(const uint8_t nonce[], size_t nonce_len) override; |
54 | | void key_schedule(const uint8_t key[], size_t length) override; |
55 | | |
56 | | std::unique_ptr<BlockCipher> m_cipher; |
57 | | std::unique_ptr<BlockCipher> m_tweak_cipher; |
58 | | secure_vector<uint8_t> m_tweak; |
59 | | const size_t m_cipher_block_size; |
60 | | const size_t m_cipher_parallelism; |
61 | | }; |
62 | | |
63 | | /** |
64 | | * IEEE P1619 XTS Encryption |
65 | | */ |
66 | | class XTS_Encryption final : public XTS_Mode |
67 | | { |
68 | | public: |
69 | | /** |
70 | | * @param cipher underlying block cipher |
71 | | */ |
72 | 0 | explicit XTS_Encryption(BlockCipher* cipher) : XTS_Mode(cipher) {} |
73 | | |
74 | | size_t process(uint8_t buf[], size_t size) override; |
75 | | |
76 | | void finish(secure_vector<uint8_t>& final_block, size_t offset = 0) override; |
77 | | |
78 | | size_t output_length(size_t input_length) const override; |
79 | | }; |
80 | | |
81 | | /** |
82 | | * IEEE P1619 XTS Decryption |
83 | | */ |
84 | | class XTS_Decryption final : public XTS_Mode |
85 | | { |
86 | | public: |
87 | | /** |
88 | | * @param cipher underlying block cipher |
89 | | */ |
90 | 0 | explicit XTS_Decryption(BlockCipher* cipher) : XTS_Mode(cipher) {} |
91 | | |
92 | | size_t process(uint8_t buf[], size_t size) override; |
93 | | |
94 | | void finish(secure_vector<uint8_t>& final_block, size_t offset = 0) override; |
95 | | |
96 | | size_t output_length(size_t input_length) const override; |
97 | | }; |
98 | | |
99 | | } |
100 | | |
101 | | #endif |