365 lines
11 KiB
C#
365 lines
11 KiB
C#
using System;
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using System.Collections;
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using System.Globalization;
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using Org.BouncyCastle.Crypto.Parameters;
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namespace Org.BouncyCastle.Crypto.Engines
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{
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/**
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* implementation of GOST 28147-89
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*/
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public class Gost28147Engine
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: IBlockCipher
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{
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private const int BlockSize = 8;
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private int[] workingKey = null;
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private bool forEncryption;
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// these are the S-boxes given in Applied Cryptography 2nd Ed., p. 333
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// This is default S-box!
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private readonly byte[] S = {
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0x4,0xA,0x9,0x2,0xD,0x8,0x0,0xE,0x6,0xB,0x1,0xC,0x7,0xF,0x5,0x3,
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0xE,0xB,0x4,0xC,0x6,0xD,0xF,0xA,0x2,0x3,0x8,0x1,0x0,0x7,0x5,0x9,
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0x5,0x8,0x1,0xD,0xA,0x3,0x4,0x2,0xE,0xF,0xC,0x7,0x6,0x0,0x9,0xB,
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0x7,0xD,0xA,0x1,0x0,0x8,0x9,0xF,0xE,0x4,0x6,0xC,0xB,0x2,0x5,0x3,
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0x6,0xC,0x7,0x1,0x5,0xF,0xD,0x8,0x4,0xA,0x9,0xE,0x0,0x3,0xB,0x2,
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0x4,0xB,0xA,0x0,0x7,0x2,0x1,0xD,0x3,0x6,0x8,0x5,0x9,0xC,0xF,0xE,
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0xD,0xB,0x4,0x1,0x3,0xF,0x5,0x9,0x0,0xA,0xE,0x7,0x6,0x8,0x2,0xC,
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0x1,0xF,0xD,0x0,0x5,0x7,0xA,0x4,0x9,0x2,0x3,0xE,0x6,0xB,0x8,0xC
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};
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/*
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* class content S-box parameters for encrypting
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* getting from, see: http://www.ietf.org/internet-drafts/draft-popov-cryptopro-cpalgs-01.txt
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* http://www.ietf.org/internet-drafts/draft-popov-cryptopro-cpalgs-02.txt
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*/
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private static readonly byte[] ESbox_Test = {
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0x4,0x2,0xF,0x5,0x9,0x1,0x0,0x8,0xE,0x3,0xB,0xC,0xD,0x7,0xA,0x6,
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0xC,0x9,0xF,0xE,0x8,0x1,0x3,0xA,0x2,0x7,0x4,0xD,0x6,0x0,0xB,0x5,
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0xD,0x8,0xE,0xC,0x7,0x3,0x9,0xA,0x1,0x5,0x2,0x4,0x6,0xF,0x0,0xB,
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0xE,0x9,0xB,0x2,0x5,0xF,0x7,0x1,0x0,0xD,0xC,0x6,0xA,0x4,0x3,0x8,
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0x3,0xE,0x5,0x9,0x6,0x8,0x0,0xD,0xA,0xB,0x7,0xC,0x2,0x1,0xF,0x4,
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0x8,0xF,0x6,0xB,0x1,0x9,0xC,0x5,0xD,0x3,0x7,0xA,0x0,0xE,0x2,0x4,
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0x9,0xB,0xC,0x0,0x3,0x6,0x7,0x5,0x4,0x8,0xE,0xF,0x1,0xA,0x2,0xD,
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0xC,0x6,0x5,0x2,0xB,0x0,0x9,0xD,0x3,0xE,0x7,0xA,0xF,0x4,0x1,0x8
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};
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private static readonly byte[] ESbox_A = {
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0x9,0x6,0x3,0x2,0x8,0xB,0x1,0x7,0xA,0x4,0xE,0xF,0xC,0x0,0xD,0x5,
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0x3,0x7,0xE,0x9,0x8,0xA,0xF,0x0,0x5,0x2,0x6,0xC,0xB,0x4,0xD,0x1,
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0xE,0x4,0x6,0x2,0xB,0x3,0xD,0x8,0xC,0xF,0x5,0xA,0x0,0x7,0x1,0x9,
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0xE,0x7,0xA,0xC,0xD,0x1,0x3,0x9,0x0,0x2,0xB,0x4,0xF,0x8,0x5,0x6,
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0xB,0x5,0x1,0x9,0x8,0xD,0xF,0x0,0xE,0x4,0x2,0x3,0xC,0x7,0xA,0x6,
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0x3,0xA,0xD,0xC,0x1,0x2,0x0,0xB,0x7,0x5,0x9,0x4,0x8,0xF,0xE,0x6,
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0x1,0xD,0x2,0x9,0x7,0xA,0x6,0x0,0x8,0xC,0x4,0x5,0xF,0x3,0xB,0xE,
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0xB,0xA,0xF,0x5,0x0,0xC,0xE,0x8,0x6,0x2,0x3,0x9,0x1,0x7,0xD,0x4
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};
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private static readonly byte[] ESbox_B = {
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0x8,0x4,0xB,0x1,0x3,0x5,0x0,0x9,0x2,0xE,0xA,0xC,0xD,0x6,0x7,0xF,
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0x0,0x1,0x2,0xA,0x4,0xD,0x5,0xC,0x9,0x7,0x3,0xF,0xB,0x8,0x6,0xE,
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0xE,0xC,0x0,0xA,0x9,0x2,0xD,0xB,0x7,0x5,0x8,0xF,0x3,0x6,0x1,0x4,
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0x7,0x5,0x0,0xD,0xB,0x6,0x1,0x2,0x3,0xA,0xC,0xF,0x4,0xE,0x9,0x8,
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0x2,0x7,0xC,0xF,0x9,0x5,0xA,0xB,0x1,0x4,0x0,0xD,0x6,0x8,0xE,0x3,
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0x8,0x3,0x2,0x6,0x4,0xD,0xE,0xB,0xC,0x1,0x7,0xF,0xA,0x0,0x9,0x5,
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0x5,0x2,0xA,0xB,0x9,0x1,0xC,0x3,0x7,0x4,0xD,0x0,0x6,0xF,0x8,0xE,
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0x0,0x4,0xB,0xE,0x8,0x3,0x7,0x1,0xA,0x2,0x9,0x6,0xF,0xD,0x5,0xC
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};
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private static readonly byte[] ESbox_C = {
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0x1,0xB,0xC,0x2,0x9,0xD,0x0,0xF,0x4,0x5,0x8,0xE,0xA,0x7,0x6,0x3,
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0x0,0x1,0x7,0xD,0xB,0x4,0x5,0x2,0x8,0xE,0xF,0xC,0x9,0xA,0x6,0x3,
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0x8,0x2,0x5,0x0,0x4,0x9,0xF,0xA,0x3,0x7,0xC,0xD,0x6,0xE,0x1,0xB,
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0x3,0x6,0x0,0x1,0x5,0xD,0xA,0x8,0xB,0x2,0x9,0x7,0xE,0xF,0xC,0x4,
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0x8,0xD,0xB,0x0,0x4,0x5,0x1,0x2,0x9,0x3,0xC,0xE,0x6,0xF,0xA,0x7,
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0xC,0x9,0xB,0x1,0x8,0xE,0x2,0x4,0x7,0x3,0x6,0x5,0xA,0x0,0xF,0xD,
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0xA,0x9,0x6,0x8,0xD,0xE,0x2,0x0,0xF,0x3,0x5,0xB,0x4,0x1,0xC,0x7,
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0x7,0x4,0x0,0x5,0xA,0x2,0xF,0xE,0xC,0x6,0x1,0xB,0xD,0x9,0x3,0x8
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};
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private static readonly byte[] ESbox_D = {
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0xF,0xC,0x2,0xA,0x6,0x4,0x5,0x0,0x7,0x9,0xE,0xD,0x1,0xB,0x8,0x3,
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0xB,0x6,0x3,0x4,0xC,0xF,0xE,0x2,0x7,0xD,0x8,0x0,0x5,0xA,0x9,0x1,
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0x1,0xC,0xB,0x0,0xF,0xE,0x6,0x5,0xA,0xD,0x4,0x8,0x9,0x3,0x7,0x2,
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0x1,0x5,0xE,0xC,0xA,0x7,0x0,0xD,0x6,0x2,0xB,0x4,0x9,0x3,0xF,0x8,
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0x0,0xC,0x8,0x9,0xD,0x2,0xA,0xB,0x7,0x3,0x6,0x5,0x4,0xE,0xF,0x1,
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0x8,0x0,0xF,0x3,0x2,0x5,0xE,0xB,0x1,0xA,0x4,0x7,0xC,0x9,0xD,0x6,
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0x3,0x0,0x6,0xF,0x1,0xE,0x9,0x2,0xD,0x8,0xC,0x4,0xB,0xA,0x5,0x7,
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0x1,0xA,0x6,0x8,0xF,0xB,0x0,0x4,0xC,0x3,0x5,0x9,0x7,0xD,0x2,0xE
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};
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//S-box for digest
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private static readonly byte[] DSbox_Test = {
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0x4,0xA,0x9,0x2,0xD,0x8,0x0,0xE,0x6,0xB,0x1,0xC,0x7,0xF,0x5,0x3,
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0xE,0xB,0x4,0xC,0x6,0xD,0xF,0xA,0x2,0x3,0x8,0x1,0x0,0x7,0x5,0x9,
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0x5,0x8,0x1,0xD,0xA,0x3,0x4,0x2,0xE,0xF,0xC,0x7,0x6,0x0,0x9,0xB,
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0x7,0xD,0xA,0x1,0x0,0x8,0x9,0xF,0xE,0x4,0x6,0xC,0xB,0x2,0x5,0x3,
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0x6,0xC,0x7,0x1,0x5,0xF,0xD,0x8,0x4,0xA,0x9,0xE,0x0,0x3,0xB,0x2,
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0x4,0xB,0xA,0x0,0x7,0x2,0x1,0xD,0x3,0x6,0x8,0x5,0x9,0xC,0xF,0xE,
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0xD,0xB,0x4,0x1,0x3,0xF,0x5,0x9,0x0,0xA,0xE,0x7,0x6,0x8,0x2,0xC,
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0x1,0xF,0xD,0x0,0x5,0x7,0xA,0x4,0x9,0x2,0x3,0xE,0x6,0xB,0x8,0xC
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};
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private static readonly byte[] DSbox_A = {
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0xA,0x4,0x5,0x6,0x8,0x1,0x3,0x7,0xD,0xC,0xE,0x0,0x9,0x2,0xB,0xF,
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0x5,0xF,0x4,0x0,0x2,0xD,0xB,0x9,0x1,0x7,0x6,0x3,0xC,0xE,0xA,0x8,
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0x7,0xF,0xC,0xE,0x9,0x4,0x1,0x0,0x3,0xB,0x5,0x2,0x6,0xA,0x8,0xD,
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0x4,0xA,0x7,0xC,0x0,0xF,0x2,0x8,0xE,0x1,0x6,0x5,0xD,0xB,0x9,0x3,
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0x7,0x6,0x4,0xB,0x9,0xC,0x2,0xA,0x1,0x8,0x0,0xE,0xF,0xD,0x3,0x5,
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0x7,0x6,0x2,0x4,0xD,0x9,0xF,0x0,0xA,0x1,0x5,0xB,0x8,0xE,0xC,0x3,
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0xD,0xE,0x4,0x1,0x7,0x0,0x5,0xA,0x3,0xC,0x8,0xF,0x6,0x2,0x9,0xB,
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0x1,0x3,0xA,0x9,0x5,0xB,0x4,0xF,0x8,0x6,0x7,0xE,0xD,0x0,0x2,0xC
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};
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//
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// pre-defined sbox table
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//
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private static readonly Hashtable sBoxes = new Hashtable();
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static Gost28147Engine()
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{
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sBoxes.Add("E-TEST", ESbox_Test);
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sBoxes.Add("E-A", ESbox_A);
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sBoxes.Add("E-B", ESbox_B);
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sBoxes.Add("E-C", ESbox_C);
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sBoxes.Add("E-D", ESbox_D);
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sBoxes.Add("D-TEST", DSbox_Test);
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sBoxes.Add("D-A", DSbox_A);
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}
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/**
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* standard constructor.
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*/
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public Gost28147Engine()
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{
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}
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/**
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* initialise an Gost28147 cipher.
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*
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* @param forEncryption whether or not we are for encryption.
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* @param parameters the parameters required to set up the cipher.
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* @exception ArgumentException if the parameters argument is inappropriate.
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*/
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public void Init(
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bool forEncryption,
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ICipherParameters parameters)
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{
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if (parameters is ParametersWithSBox)
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{
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ParametersWithSBox param = (ParametersWithSBox)parameters;
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//
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// Set the S-Box
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//
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Array.Copy(param.GetSBox(), 0, this.S, 0, param.GetSBox().Length);
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//
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// set key if there is one
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//
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if (param.Parameters != null)
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{
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workingKey = generateWorkingKey(forEncryption,
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((KeyParameter)param.Parameters).GetKey());
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}
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}
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else if (parameters is KeyParameter)
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{
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workingKey = generateWorkingKey(forEncryption,
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((KeyParameter)parameters).GetKey());
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}
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else
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{
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throw new ArgumentException("invalid parameter passed to Gost28147 init - " + parameters.GetType().Name);
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}
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}
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public string AlgorithmName
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{
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get { return "Gost28147"; }
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}
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public bool IsPartialBlockOkay
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{
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get { return false; }
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}
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public int GetBlockSize()
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{
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return BlockSize;
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}
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public int ProcessBlock(
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byte[] input,
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int inOff,
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byte[] output,
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int outOff)
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{
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if (workingKey == null)
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{
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throw new InvalidOperationException("Gost28147 engine not initialised");
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}
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if ((inOff + BlockSize) > input.Length)
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{
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throw new DataLengthException("input buffer too short");
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}
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if ((outOff + BlockSize) > output.Length)
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{
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throw new DataLengthException("output buffer too short");
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}
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Gost28147Func(workingKey, input, inOff, output, outOff);
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return BlockSize;
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}
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public void Reset()
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{
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}
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private int[] generateWorkingKey(
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bool forEncryption,
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byte[] userKey)
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{
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this.forEncryption = forEncryption;
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if (userKey.Length != 32)
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{
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throw new ArgumentException("Key length invalid. Key needs to be 32 byte - 256 bit!!!");
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}
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int[] key = new int[8];
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for(int i=0; i!=8; i++)
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{
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key[i] = bytesToint(userKey,i*4);
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}
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return key;
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}
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private int Gost28147_mainStep(int n1, int key)
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{
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int cm = (key + n1); // CM1
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// S-box replacing
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int om = S[ 0 + ((cm >> (0 * 4)) & 0xF)] << (0 * 4);
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om += S[ 16 + ((cm >> (1 * 4)) & 0xF)] << (1 * 4);
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om += S[ 32 + ((cm >> (2 * 4)) & 0xF)] << (2 * 4);
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om += S[ 48 + ((cm >> (3 * 4)) & 0xF)] << (3 * 4);
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om += S[ 64 + ((cm >> (4 * 4)) & 0xF)] << (4 * 4);
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om += S[ 80 + ((cm >> (5 * 4)) & 0xF)] << (5 * 4);
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om += S[ 96 + ((cm >> (6 * 4)) & 0xF)] << (6 * 4);
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om += S[112 + ((cm >> (7 * 4)) & 0xF)] << (7 * 4);
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// return om << 11 | om >>> (32-11); // 11-leftshift
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int omLeft = om << 11;
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int omRight = (int)(((uint) om) >> (32 - 11)); // Note: Casts required to get unsigned bit rotation
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return omLeft | omRight;
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}
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private void Gost28147Func(
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int[] workingKey,
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byte[] inBytes,
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int inOff,
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byte[] outBytes,
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int outOff)
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{
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int N1, N2, tmp; //tmp -> for saving N1
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N1 = bytesToint(inBytes, inOff);
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N2 = bytesToint(inBytes, inOff + 4);
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if (this.forEncryption)
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{
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for(int k = 0; k < 3; k++) // 1-24 steps
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{
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for(int j = 0; j < 8; j++)
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{
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tmp = N1;
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int step = Gost28147_mainStep(N1, workingKey[j]);
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N1 = N2 ^ step; // CM2
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N2 = tmp;
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}
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}
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for(int j = 7; j > 0; j--) // 25-31 steps
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{
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tmp = N1;
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N1 = N2 ^ Gost28147_mainStep(N1, workingKey[j]); // CM2
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N2 = tmp;
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}
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}
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else //decrypt
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{
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for(int j = 0; j < 8; j++) // 1-8 steps
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{
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tmp = N1;
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N1 = N2 ^ Gost28147_mainStep(N1, workingKey[j]); // CM2
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N2 = tmp;
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}
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for(int k = 0; k < 3; k++) //9-31 steps
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{
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for(int j = 7; j >= 0; j--)
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{
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if ((k == 2) && (j==0))
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{
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break; // break 32 step
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}
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tmp = N1;
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N1 = N2 ^ Gost28147_mainStep(N1, workingKey[j]); // CM2
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N2 = tmp;
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}
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}
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}
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N2 = N2 ^ Gost28147_mainStep(N1, workingKey[0]); // 32 step (N1=N1)
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intTobytes(N1, outBytes, outOff);
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intTobytes(N2, outBytes, outOff + 4);
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}
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//array of bytes to type int
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private static int bytesToint(
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byte[] inBytes,
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int inOff)
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{
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return (int)((inBytes[inOff + 3] << 24) & 0xff000000) + ((inBytes[inOff + 2] << 16) & 0xff0000) +
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((inBytes[inOff + 1] << 8) & 0xff00) + (inBytes[inOff] & 0xff);
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}
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//int to array of bytes
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private static void intTobytes(
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int num,
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byte[] outBytes,
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int outOff)
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{
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outBytes[outOff + 3] = (byte)(num >> 24);
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outBytes[outOff + 2] = (byte)(num >> 16);
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|
outBytes[outOff + 1] = (byte)(num >> 8);
|
|
outBytes[outOff] = (byte)num;
|
|
}
|
|
|
|
/**
|
|
* Return the S-Box associated with SBoxName
|
|
* @param sBoxName name of the S-Box
|
|
* @return byte array representing the S-Box
|
|
*/
|
|
public static byte[] GetSBox(
|
|
string sBoxName)
|
|
{
|
|
byte[] namedSBox = (byte[])sBoxes[sBoxName.ToUpper(CultureInfo.InvariantCulture)];
|
|
|
|
if (namedSBox == null)
|
|
{
|
|
throw new ArgumentException("Unknown S-Box - possible types: "
|
|
+ "\"E-Test\", \"E-A\", \"E-B\", \"E-C\", \"E-D\", \"D-Test\", \"D-A\".");
|
|
}
|
|
|
|
return (byte[]) namedSBox.Clone();
|
|
}
|
|
}
|
|
}
|