Botan  2.4.0
Crypto and TLS for C++11
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_PUBLIC_API(2,0) 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 
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
Definition: ofb.h:19
#define BOTAN_PUBLIC_API(maj, min)
Definition: compiler.h:27
Key_Length_Specification key_spec() const override
Definition: ofb.h:29
Definition: alg_id.cpp:13
bool valid_iv_length(size_t iv_len) const override
Definition: ofb.h:26
OFB * clone() const override
Definition: ofb.h:36
std::vector< T, secure_allocator< T > > secure_vector
Definition: secmem.h:88