Botan 2.1.0 Crypto and TLS for C++11

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ofb.h
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1 /*
2 * OFB Mode
3 * (C) 1999-2007 Jack Lloyd
4 *
5 * Botan is released under the Simplified BSD License (see license.txt)
6 */
7
8 #ifndef BOTAN_OUTPUT_FEEDBACK_MODE_H__
9 #define BOTAN_OUTPUT_FEEDBACK_MODE_H__
10
11 #include <botan/stream_cipher.h>
12 #include <botan/block_cipher.h>
13
14 namespace Botan {
15
16 /**
17 * Output Feedback Mode
18 */
19 class BOTAN_DLL OFB final : public StreamCipher
20 {
21 public:
22 void cipher(const uint8_t in[], uint8_t out[], size_t length) override;
23
24 void set_iv(const uint8_t iv[], size_t iv_len) override;
25
26 bool valid_iv_length(size_t iv_len) const override
27 { return (iv_len <= m_cipher->block_size()); }
28
29 Key_Length_Specification key_spec() const override
30 {
31 return m_cipher->key_spec();
32 }
33
34 std::string name() const override;
35
36 OFB* clone() const override
37 { return new OFB(m_cipher->clone()); }
38
39 void clear() override;
40
41 /**
42 * @param cipher the block cipher to use
43 */
44 explicit OFB(BlockCipher* cipher);
45
46 void seek(uint64_t offset) override;
47 private:
48 void key_schedule(const uint8_t key[], size_t key_len) override;
49
50 std::unique_ptr<BlockCipher> m_cipher;
51 secure_vector<uint8_t> m_buffer;
52 size_t m_buf_pos;
53 };
54
55 }
56
57 #endif
Botan::OFB
Definition: ofb.h:19
Botan::Key_Length_Specification
Definition: key_spec.h:18
Botan::OFB::key_spec
Key_Length_Specification key_spec() const override
Definition: ofb.h:29
Botan::secure_vector
std::vector< T, secure_allocator< T >> secure_vector
Definition: secmem.h:121
Botan::StreamCipher
Definition: stream_cipher.h:19
Botan
Definition: alg_id.cpp:13
Botan::OFB::valid_iv_length
bool valid_iv_length(size_t iv_len) const override
Definition: ofb.h:26
Botan::OFB::clone
OFB * clone() const override
Definition: ofb.h:36
Botan::BlockCipher
Definition: block_cipher.h:19