Botan  2.12.1
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 
15 
16 namespace Botan {
17 
18 /**
19 * RC4 stream cipher
20 */
22  {
23  public:
24  void cipher(const uint8_t in[], uint8_t out[], size_t length) override;
25 
26  void set_iv(const uint8_t iv[], size_t iv_len) override;
27 
28  void clear() override;
29  std::string name() const override;
30 
31  StreamCipher* clone() const override;
32 
33  Key_Length_Specification key_spec() const override;
34 
35  /**
36  * @param skip skip this many initial bytes in the keystream
37  */
38  explicit RC4(size_t skip = 0);
39 
40  ~RC4() { clear(); }
41 
42  void seek(uint64_t offset) override;
43  private:
44  void key_schedule(const uint8_t[], size_t) override;
45  void generate();
46 
47  const size_t m_SKIP;
48  uint8_t m_X = 0;
49  uint8_t m_Y = 0;
50  secure_vector<uint8_t> m_state;
51  secure_vector<uint8_t> m_buffer;
52  size_t m_position = 0;
53  };
54 
55 }
56 
57 #endif
int(* final)(unsigned char *, CTX *)
#define BOTAN_PUBLIC_API(maj, min)
Definition: compiler.h:31
virtual void cipher(const uint8_t in[], uint8_t out[], size_t len)=0
virtual std::string name() const =0
virtual void clear()=0
Definition: rc4.h:21
virtual void seek(uint64_t offset)=0
Definition: alg_id.cpp:13
virtual Key_Length_Specification key_spec() const =0
virtual StreamCipher * clone() const =0
std::vector< T, secure_allocator< T > > secure_vector
Definition: secmem.h:65
virtual void set_iv(const uint8_t iv[], size_t iv_len)=0
#define BOTAN_FUTURE_INTERNAL_HEADER(hdr)
Definition: compiler.h:139
~RC4()
Definition: rc4.h:40