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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 1.5 and up.
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package org.bouncycastle.pqc.crypto.xmss;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InvalidClassException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.ObjectStreamClass;
import java.util.HashSet;
import java.util.Set;
import org.bouncycastle.crypto.Digest;
import org.bouncycastle.util.Arrays;
import org.bouncycastle.util.encoders.Hex;
/**
* Utils for XMSS implementation.
*/
public class XMSSUtil
{
/**
* Calculates the logarithm base 2 for a given Integer.
*
* @param n Number.
* @return Logarithm to base 2 of {@code n}.
*/
public static int log2(int n)
{
int log = 0;
while ((n >>= 1) != 0)
{
log++;
}
return log;
}
/**
* Convert int/long to n-byte array.
*
* @param value int/long value.
* @param sizeInByte Size of byte array in byte.
* @return int/long as big-endian byte array of size {@code sizeInByte}.
*/
public static byte[] toBytesBigEndian(long value, int sizeInByte)
{
byte[] out = new byte[sizeInByte];
for (int i = (sizeInByte - 1); i >= 0; i--)
{
out[i] = (byte)value;
value >>>= 8;
}
return out;
}
/*
* Copy long to byte array in big-endian at specific offset.
*/
public static void longToBigEndian(long value, byte[] in, int offset)
{
if (in == null)
{
throw new NullPointerException("in == null");
}
if ((in.length - offset) < 8)
{
throw new IllegalArgumentException("not enough space in array");
}
in[offset] = (byte)((value >> 56) & 0xff);
in[offset + 1] = (byte)((value >> 48) & 0xff);
in[offset + 2] = (byte)((value >> 40) & 0xff);
in[offset + 3] = (byte)((value >> 32) & 0xff);
in[offset + 4] = (byte)((value >> 24) & 0xff);
in[offset + 5] = (byte)((value >> 16) & 0xff);
in[offset + 6] = (byte)((value >> 8) & 0xff);
in[offset + 7] = (byte)((value) & 0xff);
}
/*
* Generic convert from big endian byte array to long.
*/
public static long bytesToXBigEndian(byte[] in, int offset, int size)
{
if (in == null)
{
throw new NullPointerException("in == null");
}
long res = 0;
for (int i = offset; i < (offset + size); i++)
{
res = (res << 8) | (in[i] & 0xff);
}
return res;
}
/**
* Clone a byte array.
*
* @param in byte array.
* @return Copy of byte array.
*/
public static byte[] cloneArray(byte[] in)
{
if (in == null)
{
throw new NullPointerException("in == null");
}
byte[] out = new byte[in.length];
System.arraycopy(in, 0, out, 0, in.length);
return out;
}
/**
* Clone a 2d byte array.
*
* @param in 2d byte array.
* @return Copy of 2d byte array.
*/
public static byte[][] cloneArray(byte[][] in)
{
if (hasNullPointer(in))
{
throw new NullPointerException("in has null pointers");
}
byte[][] out = new byte[in.length][];
for (int i = 0; i < in.length; i++)
{
out[i] = new byte[in[i].length];
System.arraycopy(in[i], 0, out[i], 0, in[i].length);
}
return out;
}
/**
* Compares two 2d-byte arrays.
*
* @param a 2d-byte array 1.
* @param b 2d-byte array 2.
* @return true if all values in 2d-byte array are equal false else.
*/
public static boolean areEqual(byte[][] a, byte[][] b)
{
if (hasNullPointer(a) || hasNullPointer(b))
{
throw new NullPointerException("a or b == null");
}
for (int i = 0; i < a.length; i++)
{
if (!Arrays.areEqual(a[i], b[i]))
{
return false;
}
}
return true;
}
/**
* Dump content of 2d byte array.
*
* @param x byte array.
*/
public static void dumpByteArray(byte[][] x)
{
if (hasNullPointer(x))
{
throw new NullPointerException("x has null pointers");
}
for (int i = 0; i < x.length; i++)
{
System.out.println(Hex.toHexString(x[i]));
}
}
/**
* Checks whether 2d byte array has null pointers.
*
* @param in 2d byte array.
* @return true if at least one null pointer is found false else.
*/
public static boolean hasNullPointer(byte[][] in)
{
if (in == null)
{
return true;
}
for (int i = 0; i < in.length; i++)
{
if (in[i] == null)
{
return true;
}
}
return false;
}
/**
* Copy src byte array to dst byte array at offset.
*
* @param dst Destination.
* @param src Source.
* @param offset Destination offset.
*/
public static void copyBytesAtOffset(byte[] dst, byte[] src, int offset)
{
if (dst == null)
{
throw new NullPointerException("dst == null");
}
if (src == null)
{
throw new NullPointerException("src == null");
}
if (offset < 0)
{
throw new IllegalArgumentException("offset hast to be >= 0");
}
if ((src.length + offset) > dst.length)
{
throw new IllegalArgumentException("src length + offset must not be greater than size of destination");
}
for (int i = 0; i < src.length; i++)
{
dst[offset + i] = src[i];
}
}
/**
* Copy length bytes at position offset from src.
*
* @param src Source byte array.
* @param offset Offset in source byte array.
* @param length Length of bytes to copy.
* @return New byte array.
*/
public static byte[] extractBytesAtOffset(byte[] src, int offset, int length)
{
if (src == null)
{
throw new NullPointerException("src == null");
}
if (offset < 0)
{
throw new IllegalArgumentException("offset hast to be >= 0");
}
if (length < 0)
{
throw new IllegalArgumentException("length hast to be >= 0");
}
if ((offset + length) > src.length)
{
throw new IllegalArgumentException("offset + length must not be greater then size of source array");
}
byte[] out = new byte[length];
for (int i = 0; i < out.length; i++)
{
out[i] = src[offset + i];
}
return out;
}
/**
* Check whether an index is valid or not.
*
* @param height Height of binary tree.
* @param index Index to validate.
* @return true if index is valid false else.
*/
public static boolean isIndexValid(int height, long index)
{
if (index < 0)
{
throw new IllegalStateException("index must not be negative");
}
return index < (1L << height);
}
/**
* Determine digest size of digest.
*
* @param digest Digest.
* @return Digest size.
*/
public static int getDigestSize(Digest digest)
{
if (digest == null)
{
throw new NullPointerException("digest == null");
}
String algorithmName = digest.getAlgorithmName();
if (algorithmName.equals("SHAKE128"))
{
return 32;
}
if (algorithmName.equals("SHAKE256"))
{
return 64;
}
return digest.getDigestSize();
}
public static long getTreeIndex(long index, int xmssTreeHeight)
{
return index >> xmssTreeHeight;
}
public static int getLeafIndex(long index, int xmssTreeHeight)
{
return (int)(index & ((1L << xmssTreeHeight) - 1L));
}
public static byte[] serialize(Object obj)
throws IOException
{
ByteArrayOutputStream out = new ByteArrayOutputStream();
ObjectOutputStream oos = new ObjectOutputStream(out);
oos.writeObject(obj);
oos.flush();
return out.toByteArray();
}
public static Object deserialize(byte[] data, final Class clazz)
throws IOException, ClassNotFoundException
{
ByteArrayInputStream in = new ByteArrayInputStream(data);
ObjectInputStream is = new CheckingStream(clazz, in);
Object obj = is.readObject();
if (is.available() != 0)
{
throw new IOException("unexpected data found at end of ObjectInputStream");
}
// you'd hope this would always succeed!
if (clazz.isInstance(obj))
{
return obj;
}
else
{
throw new IOException("unexpected class found in ObjectInputStream");
}
}
public static int calculateTau(int index, int height)
{
int tau = 0;
for (int i = 0; i < height; i++)
{
if (((index >> i) & 1) == 0)
{
tau = i;
break;
}
}
return tau;
}
public static boolean isNewBDSInitNeeded(long globalIndex, int xmssHeight, int layer)
{
if (globalIndex == 0)
{
return false;
}
return (globalIndex % (long)Math.pow((1 << xmssHeight), layer + 1) == 0) ? true : false;
}
public static boolean isNewAuthenticationPathNeeded(long globalIndex, int xmssHeight, int layer)
{
if (globalIndex == 0)
{
return false;
}
return ((globalIndex + 1) % (long)Math.pow((1 << xmssHeight), layer) == 0) ? true : false;
}
private static class CheckingStream
extends ObjectInputStream
{
private static final Set components = new HashSet();
static
{
components.add("java.util.TreeMap");
components.add("java.lang.Integer");
components.add("java.lang.Number");
components.add("org.bouncycastle.pqc.crypto.xmss.BDS");
components.add("java.util.ArrayList");
components.add("org.bouncycastle.pqc.crypto.xmss.XMSSNode");
components.add("[B");
components.add("java.util.LinkedList");
components.add("java.util.Stack");
components.add("java.util.Vector");
components.add("[Ljava.lang.Object;");
components.add("org.bouncycastle.pqc.crypto.xmss.BDSTreeHash");
}
private final Class mainClass;
private boolean found = false;
CheckingStream(Class mainClass, InputStream in)
throws IOException
{
super(in);
this.mainClass = mainClass;
}
protected Class resolveClass(ObjectStreamClass desc)
throws IOException,
ClassNotFoundException
{
if (!found)
{
if (!desc.getName().equals(mainClass.getName()))
{
throw new InvalidClassException(
"unexpected class: ", desc.getName());
}
else
{
found = true;
}
}
else
{
if (!components.contains(desc.getName()))
{
throw new InvalidClassException(
"unexpected class: ", desc.getName());
}
}
return super.resolveClass(desc);
}
}
}
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