Package org.bouncycastle.pqc.crypto.xmss

Class XMSSUtil

java.lang.Object
org.bouncycastle.pqc.crypto.xmss.XMSSUtil
public class XMSSUtil extends Object
Utils for XMSS implementation.

  • Constructor Details

    • XMSSUtil

      public XMSSUtil()

  • Method Details

    • log2

      public static int log2(int n)
      Calculates the logarithm base 2 for a given Integer.
      Parameters:
      n - Number.
      Returns:
      Logarithm to base 2 of n.

    • toBytesBigEndian

      public static byte[] toBytesBigEndian(long value, int sizeInByte)
      Convert int/long to n-byte array.
      Parameters:
      value - int/long value.
      sizeInByte - Size of byte array in byte.
      Returns:
      int/long as big-endian byte array of size sizeInByte.

    • longToBigEndian

      public static void longToBigEndian(long value, byte[] in, int offset)

    • bytesToXBigEndian

      public static long bytesToXBigEndian(byte[] in, int offset, int size)

    • cloneArray

      public static byte[] cloneArray(byte[] in)
      Clone a byte array.
      Parameters:
      in - byte array.
      Returns:
      Copy of byte array.

    • cloneArray

      public static byte[][] cloneArray(byte[][] in)
      Clone a 2d byte array.
      Parameters:
      in - 2d byte array.
      Returns:
      Copy of 2d byte array.

    • areEqual

      public static boolean areEqual(byte[][] a, byte[][] b)
      Compares two 2d-byte arrays.
      Parameters:
      a - 2d-byte array 1.
      b - 2d-byte array 2.
      Returns:
      true if all values in 2d-byte array are equal false else.

    • dumpByteArray

      public static void dumpByteArray(byte[][] x)
      Dump content of 2d byte array.
      Parameters:
      x - byte array.

    • hasNullPointer

      public static boolean hasNullPointer(byte[][] in)
      Checks whether 2d byte array has null pointers.
      Parameters:
      in - 2d byte array.
      Returns:
      true if at least one null pointer is found false else.

    • copyBytesAtOffset

      public static void copyBytesAtOffset(byte[] dst, byte[] src, int offset)
      Copy src byte array to dst byte array at offset.
      Parameters:
      dst - Destination.
      src - Source.
      offset - Destination offset.

    • extractBytesAtOffset

      public static byte[] extractBytesAtOffset(byte[] src, int offset, int length)
      Copy length bytes at position offset from src.
      Parameters:
      src - Source byte array.
      offset - Offset in source byte array.
      length - Length of bytes to copy.
      Returns:
      New byte array.

    • isIndexValid

      public static boolean isIndexValid(int height, long index)
      Check whether an index is valid or not.
      Parameters:
      height - Height of binary tree.
      index - Index to validate.
      Returns:
      true if index is valid false else.

    • getDigestSize

      public static int getDigestSize(Digest digest)
      Determine digest size of digest.
      Parameters:
      digest - Digest.
      Returns:
      Digest size.

    • getTreeIndex

      public static long getTreeIndex(long index, int xmssTreeHeight)

    • getLeafIndex

      public static int getLeafIndex(long index, int xmssTreeHeight)

    • serialize

      public static byte[] serialize(Object obj) throws IOException
      Throws:
      IOException

    • deserialize

      public static Object deserialize(byte[] data, Class clazz) throws IOException, ClassNotFoundException
      Throws:
      IOException
      ClassNotFoundException

    • calculateTau

      public static int calculateTau(int index, int height)

    • isNewBDSInitNeeded

      public static boolean isNewBDSInitNeeded(long globalIndex, int xmssHeight, int layer)

    • isNewAuthenticationPathNeeded

      public static boolean isNewAuthenticationPathNeeded(long globalIndex, int xmssHeight, int layer)