gost

README

GOST 28147-89 block cipher for Go

Package gost implements the block cipher originally described in GOST 28147-89.

Documentation

Overview

Package gost implements the block cipher originally described in GOST 28147-89.

Index

• Constants
• Variables
• func NewBlockCipher(key []byte, sbox [][]byte) (cipher.Block, error)
• type KeySizeError
  • func (k KeySizeError) Error() string
• type SboxSizeError
  • func (k SboxSizeError) Error() string

Constants

const BlockSize = 8

GOST 28147-89 defines a block size of 64 bits

Variables

var CryptoProSbox = [][]byte{
	{10, 4, 5, 6, 8, 1, 3, 7, 13, 12, 14, 0, 9, 2, 11, 15},
	{5, 15, 4, 0, 2, 13, 11, 9, 1, 7, 6, 3, 12, 14, 10, 8},
	{7, 15, 12, 14, 9, 4, 1, 0, 3, 11, 5, 2, 6, 10, 8, 13},
	{4, 10, 7, 12, 0, 15, 2, 8, 14, 1, 6, 5, 13, 11, 9, 3},
	{7, 6, 4, 11, 9, 12, 2, 10, 1, 8, 0, 14, 15, 13, 3, 5},
	{7, 6, 2, 4, 13, 9, 15, 0, 10, 1, 5, 11, 8, 14, 12, 3},
	{13, 14, 4, 1, 7, 0, 5, 10, 3, 12, 8, 15, 6, 2, 9, 11},
	{1, 3, 10, 9, 5, 11, 4, 15, 8, 6, 7, 14, 13, 0, 2, 12},
}

S-box specified by the CryptoPro company, defined in RFC 4357

var DESDerivedSbox = [][]byte{
	{14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7},
	{15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10},
	{10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8},
	{7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15},
	{2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9},
	{12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11},
	{4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1},
	{13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7},
}

S-box derived from the DES S-box, used in Bruce Schneier's Applied Cryptography

var SboxIdtc26gost28147paramZ = [][]byte{
	{12, 4, 6, 2, 10, 5, 11, 9, 14, 8, 13, 7, 0, 3, 15, 1},
	{6, 8, 2, 3, 9, 10, 5, 12, 1, 14, 4, 7, 11, 13, 0, 15},
	{11, 3, 5, 8, 2, 15, 10, 13, 14, 1, 7, 4, 12, 9, 6, 0},
	{12, 8, 2, 1, 13, 4, 15, 6, 7, 0, 10, 5, 3, 14, 9, 11},
	{7, 15, 5, 10, 8, 1, 6, 13, 0, 9, 3, 14, 11, 4, 2, 12},
	{5, 13, 15, 6, 9, 2, 12, 10, 11, 7, 8, 1, 4, 3, 14, 0},
	{8, 14, 2, 5, 6, 9, 1, 12, 15, 4, 11, 0, 13, 10, 3, 7},
	{1, 7, 14, 13, 0, 5, 8, 3, 4, 15, 10, 6, 9, 12, 11, 2},
}

S-box specified by the TC26, defined in RFC 8891

var TestSbox = [][]byte{
	{4, 10, 9, 2, 13, 8, 0, 14, 6, 11, 1, 12, 7, 15, 5, 3},
	{14, 11, 4, 12, 6, 13, 15, 10, 2, 3, 8, 1, 0, 7, 5, 9},
	{5, 8, 1, 13, 10, 3, 4, 2, 14, 15, 12, 7, 6, 0, 9, 11},
	{7, 13, 10, 1, 0, 8, 9, 15, 14, 4, 6, 12, 11, 2, 5, 3},
	{6, 12, 7, 1, 5, 15, 13, 8, 4, 10, 9, 14, 0, 3, 11, 2},
	{4, 11, 10, 0, 7, 2, 1, 13, 3, 6, 8, 5, 9, 12, 15, 14},
	{13, 11, 4, 1, 3, 15, 5, 9, 0, 10, 14, 7, 6, 8, 2, 12},
	{1, 15, 13, 0, 5, 7, 10, 4, 9, 2, 3, 14, 6, 11, 8, 12},
}

Test parameters s-box, defined in RFC 4357

Functions

func NewBlockCipher

func NewBlockCipher(key []byte, sbox [][]byte) (cipher.Block, error)

NewBlockCipher creates and returns a new cipher.Block. The key argument should be the 32 byte GOST 28147-89 key. The sbox argument should be a 64 byte substitution table, represented as a two-dimensional array of 8 rows of 16 4-bit integers.

Types

type KeySizeError

type KeySizeError int

func (KeySizeError) Error

func (k KeySizeError) Error() string

type SboxSizeError

type SboxSizeError int

func (SboxSizeError) Error

func (k SboxSizeError) Error() string