Botan 3.6.1
Crypto and TLS for C&
Public Member Functions | List of all members
Botan::GOST_28147_89_Params Class Referencefinal

#include <gost_28147.h>

Public Member Functions

 GOST_28147_89_Params (std::string_view name="R3411_94_TestParam")
 
std::string param_name () const
 
uint8_t sbox_entry (size_t row, size_t col) const
 
uint8_t sbox_pair (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 ( std::string_view name = "R3411_94_TestParam")
explicit

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
nameof the parameter set

Definition at line 28 of file gost_28147.cpp.

28 : m_name(n) {
29 // Encoded in the packed fromat from RFC 4357
30
31 // GostR3411_94_TestParamSet (OID 1.2.643.2.2.31.0)
32 static const uint8_t GOST_R_3411_TEST_PARAMS[64] = {
33 0x4E, 0x57, 0x64, 0xD1, 0xAB, 0x8D, 0xCB, 0xBF, 0x94, 0x1A, 0x7A, 0x4D, 0x2C, 0xD1, 0x10, 0x10,
34 0xD6, 0xA0, 0x57, 0x35, 0x8D, 0x38, 0xF2, 0xF7, 0x0F, 0x49, 0xD1, 0x5A, 0xEA, 0x2F, 0x8D, 0x94,
35 0x62, 0xEE, 0x43, 0x09, 0xB3, 0xF4, 0xA6, 0xA2, 0x18, 0xC6, 0x98, 0xE3, 0xC1, 0x7C, 0xE5, 0x7E,
36 0x70, 0x6B, 0x09, 0x66, 0xF7, 0x02, 0x3C, 0x8B, 0x55, 0x95, 0xBF, 0x28, 0x39, 0xB3, 0x2E, 0xCC};
37
38 // GostR3411-94-CryptoProParamSet (OID 1.2.643.2.2.31.1)
39 static const uint8_t GOST_R_3411_CRYPTOPRO_PARAMS[64] = {
40 0xA5, 0x74, 0x77, 0xD1, 0x4F, 0xFA, 0x66, 0xE3, 0x54, 0xC7, 0x42, 0x4A, 0x60, 0xEC, 0xB4, 0x19,
41 0x82, 0x90, 0x9D, 0x75, 0x1D, 0x4F, 0xC9, 0x0B, 0x3B, 0x12, 0x2F, 0x54, 0x79, 0x08, 0xA0, 0xAF,
42 0xD1, 0x3E, 0x1A, 0x38, 0xC7, 0xB1, 0x81, 0xC6, 0xE6, 0x56, 0x05, 0x87, 0x03, 0x25, 0xEB, 0xFE,
43 0x9C, 0x6D, 0xF8, 0x6D, 0x2E, 0xAB, 0xDE, 0x20, 0xBA, 0x89, 0x3C, 0x92, 0xF8, 0xD3, 0x53, 0xBC};
44
45 if(m_name == "R3411_94_TestParam") {
46 m_sboxes = GOST_R_3411_TEST_PARAMS;
47 } else if(m_name == "R3411_CryptoPro") {
48 m_sboxes = GOST_R_3411_CRYPTOPRO_PARAMS;
49 } else {
50 throw Invalid_Argument(fmt("GOST_28147_89_Params: Unknown sbox params '{}'", m_name));
51 }
52}
Botan::fmt
std::string fmt(std::string_view format, const T &... args)
Definition fmt.h:53

References Botan::fmt().

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 33 of file gost_28147.h.

33{ return m_name; }

◆ sbox_entry()

uint8_t Botan::GOST_28147_89_Params::sbox_entry ( size_t row,
size_t col ) const
Parameters
rowthe row
colthe column
Returns
sbox entry at this row/column

Definition at line 17 of file gost_28147.cpp.

17 {
18 const uint8_t x = m_sboxes[4 * col + (row / 2)];
19 return (row % 2 == 0) ? (x >> 4) : (x & 0x0F);
20}

◆ sbox_pair()

uint8_t Botan::GOST_28147_89_Params::sbox_pair ( size_t row,
size_t col ) const

Return a representation used for building larger tables For internal use

Definition at line 22 of file gost_28147.cpp.

22 {
23 const uint8_t x = m_sboxes[4 * (col % 16) + row];
24 const uint8_t y = m_sboxes[4 * (col / 16) + row];
25 return (x >> 4) | (y << 4);
26}

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

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