/src/botan/build/include/botan/internal/cbc.h
Line | Count | Source (jump to first uncovered line) |
1 | | /* |
2 | | * CBC mode |
3 | | * (C) 1999-2007,2013 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_CBC_H_ |
10 | | #define BOTAN_MODE_CBC_H_ |
11 | | |
12 | | #include <botan/cipher_mode.h> |
13 | | #include <botan/block_cipher.h> |
14 | | #include <botan/internal/mode_pad.h> |
15 | | |
16 | | namespace Botan { |
17 | | |
18 | | /** |
19 | | * CBC Mode |
20 | | */ |
21 | | class CBC_Mode : public Cipher_Mode |
22 | | { |
23 | | public: |
24 | | std::string name() const override; |
25 | | |
26 | | size_t update_granularity() const override; |
27 | | |
28 | | Key_Length_Specification key_spec() const override; |
29 | | |
30 | | size_t default_nonce_length() const override; |
31 | | |
32 | | bool valid_nonce_length(size_t n) const override; |
33 | | |
34 | | void clear() override; |
35 | | |
36 | | void reset() override; |
37 | | |
38 | | protected: |
39 | | CBC_Mode(BlockCipher* cipher, BlockCipherModePaddingMethod* padding); |
40 | | |
41 | 10.0k | const BlockCipher& cipher() const { return *m_cipher; } |
42 | | |
43 | | const BlockCipherModePaddingMethod& padding() const |
44 | 0 | { |
45 | 0 | BOTAN_ASSERT_NONNULL(m_padding); |
46 | 0 | return *m_padding; |
47 | 0 | } |
48 | | |
49 | 2.13k | size_t block_size() const { return m_block_size; } |
50 | | |
51 | 1.92k | secure_vector<uint8_t>& state() { return m_state; } |
52 | | |
53 | 11.4k | uint8_t* state_ptr() { return m_state.data(); } |
54 | | |
55 | | private: |
56 | | void start_msg(const uint8_t nonce[], size_t nonce_len) override; |
57 | | |
58 | | void key_schedule(const uint8_t key[], size_t length) override; |
59 | | |
60 | | std::unique_ptr<BlockCipher> m_cipher; |
61 | | std::unique_ptr<BlockCipherModePaddingMethod> m_padding; |
62 | | secure_vector<uint8_t> m_state; |
63 | | size_t m_block_size; |
64 | | }; |
65 | | |
66 | | /** |
67 | | * CBC Encryption |
68 | | */ |
69 | | class CBC_Encryption : public CBC_Mode |
70 | | { |
71 | | public: |
72 | | /** |
73 | | * @param cipher block cipher to use |
74 | | * @param padding padding method to use |
75 | | */ |
76 | | CBC_Encryption(BlockCipher* cipher, BlockCipherModePaddingMethod* padding) : |
77 | 573 | CBC_Mode(cipher, padding) {} |
78 | | |
79 | | size_t process(uint8_t buf[], size_t size) override; |
80 | | |
81 | | void finish(secure_vector<uint8_t>& final_block, size_t offset = 0) override; |
82 | | |
83 | | size_t output_length(size_t input_length) const override; |
84 | | |
85 | | size_t minimum_final_size() const override; |
86 | | }; |
87 | | |
88 | | /** |
89 | | * CBC Encryption with ciphertext stealing (CBC-CS3 variant) |
90 | | */ |
91 | | class CTS_Encryption final : public CBC_Encryption |
92 | | { |
93 | | public: |
94 | | /** |
95 | | * @param cipher block cipher to use |
96 | | */ |
97 | 0 | explicit CTS_Encryption(BlockCipher* cipher) : CBC_Encryption(cipher, nullptr) {} |
98 | | |
99 | | size_t output_length(size_t input_length) const override; |
100 | | |
101 | | void finish(secure_vector<uint8_t>& final_block, size_t offset = 0) override; |
102 | | |
103 | | size_t minimum_final_size() const override; |
104 | | |
105 | | bool valid_nonce_length(size_t n) const override; |
106 | | }; |
107 | | |
108 | | /** |
109 | | * CBC Decryption |
110 | | */ |
111 | | class CBC_Decryption : public CBC_Mode |
112 | | { |
113 | | public: |
114 | | /** |
115 | | * @param cipher block cipher to use |
116 | | * @param padding padding method to use |
117 | | */ |
118 | | CBC_Decryption(BlockCipher* cipher, BlockCipherModePaddingMethod* padding) : |
119 | 454 | CBC_Mode(cipher, padding), m_tempbuf(update_granularity()) {} |
120 | | |
121 | | size_t process(uint8_t buf[], size_t size) override; |
122 | | |
123 | | void finish(secure_vector<uint8_t>& final_block, size_t offset = 0) override; |
124 | | |
125 | | size_t output_length(size_t input_length) const override; |
126 | | |
127 | | size_t minimum_final_size() const override; |
128 | | |
129 | | void reset() override; |
130 | | |
131 | | private: |
132 | | secure_vector<uint8_t> m_tempbuf; |
133 | | }; |
134 | | |
135 | | /** |
136 | | * CBC Decryption with ciphertext stealing (CBC-CS3 variant) |
137 | | */ |
138 | | class CTS_Decryption final : public CBC_Decryption |
139 | | { |
140 | | public: |
141 | | /** |
142 | | * @param cipher block cipher to use |
143 | | */ |
144 | 0 | explicit CTS_Decryption(BlockCipher* cipher) : CBC_Decryption(cipher, nullptr) {} |
145 | | |
146 | | void finish(secure_vector<uint8_t>& final_block, size_t offset = 0) override; |
147 | | |
148 | | size_t minimum_final_size() const override; |
149 | | |
150 | | bool valid_nonce_length(size_t n) const override; |
151 | | }; |
152 | | |
153 | | } |
154 | | |
155 | | #endif |