Botan  1.10.9
gost_28147.h
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1 /*
2 * GOST 28147-89
3 * (C) 1999-2009 Jack Lloyd
4 *
5 * Distributed under the terms of the Botan license
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  byte 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 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 byte* sboxes;
46  std::string name;
47  };
48 
49 /**
50 * GOST 28147-89
51 */
52 class BOTAN_DLL GOST_28147_89 : public Block_Cipher_Fixed_Params<8, 32>
53  {
54  public:
55  void encrypt_n(const byte in[], byte out[], size_t blocks) const;
56  void decrypt_n(const byte in[], byte out[], size_t blocks) const;
57 
58  void clear() { zeroise(EK); }
59 
60  std::string name() const;
61  BlockCipher* clone() const { return new GOST_28147_89(SBOX); }
62 
63  /**
64  * @param params the sbox parameters to use
65  */
66  GOST_28147_89(const GOST_28147_89_Params& params);
67  private:
68  GOST_28147_89(const SecureVector<u32bit>& other_SBOX) :
69  SBOX(other_SBOX), EK(8) {}
70 
71  void key_schedule(const byte[], size_t);
72 
73  SecureVector<u32bit> SBOX;
74  SecureVector<u32bit> EK;
75  };
76 
77 }
78 
79 #endif
BlockCipher * clone() const
Definition: gost_28147.h:61
unsigned char byte
Definition: types.h:22
std::string param_name() const
Definition: gost_28147.h:34
void zeroise(MemoryRegion< T > &vec)
Definition: secmem.h:415