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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.8 and up.
package org.bouncycastle.crypto.macs;
import org.bouncycastle.crypto.CipherParameters;
import org.bouncycastle.crypto.CryptoServicePurpose;
import org.bouncycastle.crypto.CryptoServicesRegistrar;
import org.bouncycastle.crypto.DataLengthException;
import org.bouncycastle.crypto.Mac;
import org.bouncycastle.crypto.constraints.DefaultServiceProperties;
import org.bouncycastle.crypto.params.KeyParameter;
import org.bouncycastle.crypto.params.ParametersWithIV;
import org.bouncycastle.crypto.params.ParametersWithSBox;
import org.bouncycastle.util.Pack;
/**
* implementation of GOST 28147-89 MAC
*/
public class GOST28147Mac
implements Mac
{
private final CryptoServicePurpose purpose;
private static final int BLOCK_SIZE = 8;
private static final int MAC_SIZE = 4;
private int bufOff;
private byte[] buf;
private byte[] mac;
private boolean firstStep = true;
private int[] workingKey = null;
private byte[] macIV = null;
//
// This is default S-box - E_A.
private byte S[] =
{
0x9,0x6,0x3,0x2,0x8,0xB,0x1,0x7,0xA,0x4,0xE,0xF,0xC,0x0,0xD,0x5,
0x3,0x7,0xE,0x9,0x8,0xA,0xF,0x0,0x5,0x2,0x6,0xC,0xB,0x4,0xD,0x1,
0xE,0x4,0x6,0x2,0xB,0x3,0xD,0x8,0xC,0xF,0x5,0xA,0x0,0x7,0x1,0x9,
0xE,0x7,0xA,0xC,0xD,0x1,0x3,0x9,0x0,0x2,0xB,0x4,0xF,0x8,0x5,0x6,
0xB,0x5,0x1,0x9,0x8,0xD,0xF,0x0,0xE,0x4,0x2,0x3,0xC,0x7,0xA,0x6,
0x3,0xA,0xD,0xC,0x1,0x2,0x0,0xB,0x7,0x5,0x9,0x4,0x8,0xF,0xE,0x6,
0x1,0xD,0x2,0x9,0x7,0xA,0x6,0x0,0x8,0xC,0x4,0x5,0xF,0x3,0xB,0xE,
0xB,0xA,0xF,0x5,0x0,0xC,0xE,0x8,0x6,0x2,0x3,0x9,0x1,0x7,0xD,0x4
};
public GOST28147Mac()
{
this(CryptoServicePurpose.AUTHENTICATION);
}
public GOST28147Mac(CryptoServicePurpose purpose)
{
this.purpose = purpose;
mac = new byte[BLOCK_SIZE];
buf = new byte[BLOCK_SIZE];
bufOff = 0;
}
private int[] generateWorkingKey(
byte[] userKey)
{
if (userKey.length != 32)
{
throw new IllegalArgumentException("Key length invalid. Key needs to be 32 byte - 256 bit!!!");
}
int key[] = new int[8];
for(int i=0; i!=8; i++)
{
key[i] = Pack.littleEndianToInt(userKey, i*4);
}
return key;
}
public void init(
CipherParameters params)
throws IllegalArgumentException
{
reset();
buf = new byte[BLOCK_SIZE];
macIV = null;
recursiveInit(params);
CryptoServicesRegistrar.checkConstraints(new DefaultServiceProperties(getAlgorithmName(), 178, params, purpose));
}
private void recursiveInit(
CipherParameters params)
throws IllegalArgumentException
{
if (params == null)
{
return;
}
CipherParameters child = null;
if (params instanceof ParametersWithSBox)
{
ParametersWithSBox param = (ParametersWithSBox)params;
//
// Set the S-Box
//
System.arraycopy(param.getSBox(), 0, this.S, 0, param.getSBox().length);
child = param.getParameters();
}
else if (params instanceof KeyParameter)
{
workingKey = generateWorkingKey(((KeyParameter)params).getKey());
}
else if (params instanceof ParametersWithIV)
{
ParametersWithIV p = (ParametersWithIV)params;
System.arraycopy(p.getIV(), 0, mac, 0, mac.length);
macIV = p.getIV(); // don't skip the initial CM5Func
child = p.getParameters();
}
else
{
throw new IllegalArgumentException("invalid parameter passed to GOST28147 init - " + params.getClass().getName());
}
recursiveInit(child);
}
public String getAlgorithmName()
{
return "GOST28147Mac";
}
public int getMacSize()
{
return MAC_SIZE;
}
private int gost28147_mainStep(int n1, int key)
{
int cm = (key + n1); // CM1
// S-box replacing
int om = S[ 0 + ((cm >> (0 * 4)) & 0xF)] << (0 * 4);
om += S[ 16 + ((cm >> (1 * 4)) & 0xF)] << (1 * 4);
om += S[ 32 + ((cm >> (2 * 4)) & 0xF)] << (2 * 4);
om += S[ 48 + ((cm >> (3 * 4)) & 0xF)] << (3 * 4);
om += S[ 64 + ((cm >> (4 * 4)) & 0xF)] << (4 * 4);
om += S[ 80 + ((cm >> (5 * 4)) & 0xF)] << (5 * 4);
om += S[ 96 + ((cm >> (6 * 4)) & 0xF)] << (6 * 4);
om += S[112 + ((cm >> (7 * 4)) & 0xF)] << (7 * 4);
return om << 11 | om >>> (32-11); // 11-leftshift
}
private void gost28147MacFunc(
int[] workingKey,
byte[] in,
int inOff,
byte[] out,
int outOff)
{
int N1 = Pack.littleEndianToInt(in, inOff);
int N2 = Pack.littleEndianToInt(in, inOff + 4);
int tmp; //tmp -> for saving N1
for(int k = 0; k < 2; k++) // 1-16 steps
{
for(int j = 0; j < 8; j++)
{
tmp = N1;
N1 = N2 ^ gost28147_mainStep(N1, workingKey[j]); // CM2
N2 = tmp;
}
}
Pack.intToLittleEndian(N1, out, outOff);
Pack.intToLittleEndian(N2, out, outOff + 4);
}
public void update(byte in)
throws IllegalStateException
{
if (bufOff == buf.length)
{
byte[] sum = new byte[buf.length];
if (firstStep)
{
firstStep = false;
if (macIV != null)
{
CM5func(buf, 0, macIV, sum);
}
else
{
System.arraycopy(buf, 0, sum, 0, mac.length);
}
}
else
{
CM5func(buf, 0, mac, sum);
}
gost28147MacFunc(workingKey, sum, 0, mac, 0);
bufOff = 0;
}
buf[bufOff++] = in;
}
public void update(byte[] in, int inOff, int len)
throws DataLengthException, IllegalStateException
{
if (len < 0)
{
throw new IllegalArgumentException("Can't have a negative input length!");
}
int gapLen = BLOCK_SIZE - bufOff;
if (len > gapLen)
{
System.arraycopy(in, inOff, buf, bufOff, gapLen);
byte[] sum = new byte[buf.length];
if (firstStep)
{
firstStep = false;
if (macIV != null)
{
CM5func(buf, 0, macIV, sum);
}
else
{
System.arraycopy(buf, 0, sum, 0, mac.length);
}
}
else
{
CM5func(buf, 0, mac, sum);
}
gost28147MacFunc(workingKey, sum, 0, mac, 0);
bufOff = 0;
len -= gapLen;
inOff += gapLen;
while (len > BLOCK_SIZE)
{
CM5func(in, inOff, mac, sum);
gost28147MacFunc(workingKey, sum, 0, mac, 0);
len -= BLOCK_SIZE;
inOff += BLOCK_SIZE;
}
}
System.arraycopy(in, inOff, buf, bufOff, len);
bufOff += len;
}
public int doFinal(byte[] out, int outOff)
throws DataLengthException, IllegalStateException
{
//padding with zero
while (bufOff < BLOCK_SIZE)
{
buf[bufOff] = 0;
bufOff++;
}
byte[] sum = new byte[buf.length];
if (firstStep)
{
firstStep = false;
System.arraycopy(buf, 0, sum, 0, mac.length);
}
else
{
CM5func(buf, 0, mac, sum);
}
gost28147MacFunc(workingKey, sum, 0, mac, 0);
System.arraycopy(mac, (mac.length/2)-MAC_SIZE, out, outOff, MAC_SIZE);
reset();
return MAC_SIZE;
}
public void reset()
{
/*
* clean the buffer.
*/
for (int i = 0; i < buf.length; i++)
{
buf[i] = 0;
}
bufOff = 0;
firstStep = true;
}
private static void CM5func(byte[] buf, int bufOff, byte[] mac, byte[] sum)
{
for (int i = 0; i < BLOCK_SIZE; ++i)
{
sum[i] = (byte)(buf[bufOff + i] ^ mac[i]);
}
}
}