Botan  2.4.0
Crypto and TLS for C++11
rc4.h
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1 /*
2 * RC4
3 * (C) 1999-2008 Jack Lloyd
4 *
5 * Botan is released under the Simplified BSD License (see license.txt)
6 */
7 
8 #ifndef BOTAN_RC4_H_
9 #define BOTAN_RC4_H_
10 
11 #include <botan/stream_cipher.h>
12 #include <botan/types.h>
13 
14 namespace Botan {
15 
16 /**
17 * RC4 stream cipher
18 */
19 class BOTAN_PUBLIC_API(2,0) RC4 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  void clear() override;
27  std::string name() const override;
28 
29  StreamCipher* clone() const override { return new RC4(m_SKIP); }
30 
32  {
33  return Key_Length_Specification(1, 256);
34  }
35 
36  /**
37  * @param skip skip this many initial bytes in the keystream
38  */
39  explicit RC4(size_t skip = 0);
40 
41  ~RC4() { clear(); }
42 
43  void seek(uint64_t offset) override;
44  private:
45  void key_schedule(const uint8_t[], size_t) override;
46  void generate();
47 
48  const size_t m_SKIP;
49  uint8_t m_X = 0;
50  uint8_t m_Y = 0;
51  secure_vector<uint8_t> m_state;
52  secure_vector<uint8_t> m_buffer;
53  size_t m_position = 0;
54  };
55 
56 }
57 
58 #endif
Key_Length_Specification key_spec() const override
Definition: rc4.h:31
#define BOTAN_PUBLIC_API(maj, min)
Definition: compiler.h:27
Definition: rc4.h:19
Definition: alg_id.cpp:13
StreamCipher * clone() const override
Definition: rc4.h:29
std::vector< T, secure_allocator< T > > secure_vector
Definition: secmem.h:88
~RC4()
Definition: rc4.h:41