Botan  2.1.0
Crypto and TLS for C++11
gost_28147.h
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1 /*
2 * GOST 28147-89
3 * (C) 1999-2009 Jack Lloyd
4 *
5 * Botan is released under the Simplified BSD License (see license.txt)
6 */
7 
8 #ifndef BOTAN_GOST_28147_89_H__
9 #define BOTAN_GOST_28147_89_H__
10 
11 #include <botan/block_cipher.h>
12 
13 namespace Botan {
14 
15 /**
16 * The GOST 28147-89 block cipher uses a set of 4 bit Sboxes, however
17 * the standard does not actually define these Sboxes; they are
18 * considered a local configuration issue. Several different sets are
19 * used.
20 */
21 class BOTAN_DLL GOST_28147_89_Params
22  {
23  public:
24  /**
25  * @param row the row
26  * @param col the column
27  * @return sbox entry at this row/column
28  */
29  uint8_t sbox_entry(size_t row, size_t col) const;
30 
31  /**
32  * @return name of this parameter set
33  */
34  std::string param_name() const { return m_name; }
35 
36  /**
37  * Default GOST parameters are the ones given in GOST R 34.11 for
38  * testing purposes; these sboxes are also used by Crypto++, and,
39  * at least according to Wikipedia, the Central Bank of Russian
40  * Federation
41  * @param name of the parameter set
42  */
43  GOST_28147_89_Params(const std::string& name = "R3411_94_TestParam");
44  private:
45  const uint8_t* m_sboxes;
46  std::string m_name;
47  };
48 
49 /**
50 * GOST 28147-89
51 */
52 class BOTAN_DLL GOST_28147_89 final : public Block_Cipher_Fixed_Params<8, 32>
53  {
54  public:
55  void encrypt_n(const uint8_t in[], uint8_t out[], size_t blocks) const override;
56  void decrypt_n(const uint8_t in[], uint8_t out[], size_t blocks) const override;
57 
58  void clear() override;
59 
60  std::string name() const override;
61  BlockCipher* clone() const override { return new GOST_28147_89(m_SBOX); }
62 
63  /**
64  * @param params the sbox parameters to use
65  */
66  explicit GOST_28147_89(const GOST_28147_89_Params& params);
67  private:
68  explicit GOST_28147_89(const std::vector<uint32_t>& other_SBOX) :
69  m_SBOX(other_SBOX), m_EK(8) {}
70 
71  void key_schedule(const uint8_t[], size_t) override;
72 
73  /*
74  * The sbox is not secret, this is just a larger expansion of it
75  * which we generate at runtime for faster execution
76  */
77  std::vector<uint32_t> m_SBOX;
78 
79  secure_vector<uint32_t> m_EK;
80  };
81 
82 }
83 
84 #endif
std::string m_name
std::string param_name() const
Definition: gost_28147.h:34
Definition: alg_id.cpp:13
BlockCipher * clone() const override
Definition: gost_28147.h:61