Botan 1.10.17

Public Member Functions | List of all members
Botan::GOST_28147_89_Params Class Reference

`#include <gost_28147.h>`

## Public Member Functions
| GOST_28147_89_Params (const std::string &name="R3411_94_TestParam")
std::string | param_name () const
byte | sbox_entry (size_t row, size_t col) const

## Detailed Description

The GOST 28147-89 block cipher uses a set of 4 bit Sboxes, however the standard does not actually define these Sboxes; they are considered a local configuration issue. Several different sets are used.

Definition at line 21 of file gost_28147.h.

## Constructor & Destructor Documentation

## ◆ GOST_28147_89_Params()

Botan::GOST_28147_89_Params::GOST_28147_89_Params | ( | const std::string & | name = `"R3411_94_TestParam"` | ) |

Default GOST parameters are the ones given in GOST R 34.11 for testing purposes; these sboxes are also used by Crypto++, and, at least according to Wikipedia, the Central Bank of Russian Federation

Parameters

  name | of the parameter set

Definition at line 21 of file gost_28147.cpp.

21 : name(n)
22 {
23 // Encoded in the packed fromat from RFC 4357
24
25 // GostR3411_94_TestParamSet (OID 1.2.643.2.2.31.0)
26 static const byte GOST_R_3411_TEST_PARAMS[64] = {
27 0x4E, 0x57, 0x64, 0xD1, 0xAB, 0x8D, 0xCB, 0xBF, 0x94, 0x1A, 0x7A,
28 0x4D, 0x2C, 0xD1, 0x10, 0x10, 0xD6, 0xA0, 0x57, 0x35, 0x8D, 0x38,
29 0xF2, 0xF7, 0x0F, 0x49, 0xD1, 0x5A, 0xEA, 0x2F, 0x8D, 0x94, 0x62,
30 0xEE, 0x43, 0x09, 0xB3, 0xF4, 0xA6, 0xA2, 0x18, 0xC6, 0x98, 0xE3,
31 0xC1, 0x7C, 0xE5, 0x7E, 0x70, 0x6B, 0x09, 0x66, 0xF7, 0x02, 0x3C,
32 0x8B, 0x55, 0x95, 0xBF, 0x28, 0x39, 0xB3, 0x2E, 0xCC };
33
34 // GostR3411-94-CryptoProParamSet (OID 1.2.643.2.2.31.1)
35 static const byte GOST_R_3411_CRYPTOPRO_PARAMS[64] = {
36 0xA5, 0x74, 0x77, 0xD1, 0x4F, 0xFA, 0x66, 0xE3, 0x54, 0xC7, 0x42,
37 0x4A, 0x60, 0xEC, 0xB4, 0x19, 0x82, 0x90, 0x9D, 0x75, 0x1D, 0x4F,
38 0xC9, 0x0B, 0x3B, 0x12, 0x2F, 0x54, 0x79, 0x08, 0xA0, 0xAF, 0xD1,
39 0x3E, 0x1A, 0x38, 0xC7, 0xB1, 0x81, 0xC6, 0xE6, 0x56, 0x05, 0x87,
40 0x03, 0x25, 0xEB, 0xFE, 0x9C, 0x6D, 0xF8, 0x6D, 0x2E, 0xAB, 0xDE,
41 0x20, 0xBA, 0x89, 0x3C, 0x92, 0xF8, 0xD3, 0x53, 0xBC };
42
43 if(name == "R3411_94_TestParam")
44 sboxes = GOST_R_3411_TEST_PARAMS;
45 else if(name == "R3411_CryptoPro")
46 sboxes = GOST_R_3411_CRYPTOPRO_PARAMS;
47 else
48 throw Invalid_Argument("GOST_28147_89_Params: Unknown " + name);
49 }
Botan::Invalid_Argument
std::invalid_argument Invalid_Argument
Definition: exceptn.h:20
Botan::byte
unsigned char byte
Definition: types.h:22

## Member Function Documentation

## ◆ param_name()

std::string Botan::GOST_28147_89_Params::param_name | ( |  | ) | const
| inline

Returns
  name of this parameter set

Definition at line 34 of file gost_28147.h.

34 { return name; }

## ◆ sbox_entry()

byte Botan::GOST_28147_89_Params::sbox_entry | ( | size_t | row,
|  | size_t | col
| ) |  | const

Parameters

  row | the row
  col | the column

Returns
  sbox entry at this row/column

Definition at line 14 of file gost_28147.cpp.

Referenced by Botan::GOST_28147_89::GOST_28147_89().

15 {
16 byte x = sboxes[4 * col + (row / 2)];
17
18 return (row % 2 == 0) ? (x >> 4) : (x & 0x0F);
19 }
Botan::byte
unsigned char byte
Definition: types.h:22

The documentation for this class was generated from the following files:

- src/block/gost_28147/gost_28147.h
- src/block/gost_28147/gost_28147.cpp