Constructor Detail

• Utils

  public Utils()

Method Detail

• bit

  public static int bit(byte[] h,
                        int i)

  Get the i'th bit of a byte array.

  Parameters:

  h - the byte array.

  i - the bit index.

  Returns:

  0 or 1, the value of the i'th bit in h

• bytesToHex

  public static String bytesToHex(byte[] raw)

  Converts bytes to a hex string.

  Parameters:

  raw - the byte[] to be converted.

  Returns:

  the hex representation as a string.

• equal

  public static int equal(byte[] b,
                          byte[] c)

  Constant-time byte[] comparison.

  Parameters:

  b - a byte[]

  c - a byte[]

  Returns:

  1 if b and c are equal, 0 otherwise.

• equal

  public static int equal(int b,
                          int c)

  Constant-time byte comparison.

  Parameters:

  b - a byte

  c - a byte

  Returns:

  1 if b and c are equal, 0 otherwise.

• hexToBytes

  public static byte[] hexToBytes(String s)

  Converts a hex string to bytes.

  Parameters:

  s - the hex string to be converted.

  Returns:

  the byte[]

• negative

  public static int negative(int b)

  Constant-time determine if byte is negative.

  Parameters:

  b - the byte to check.

  Returns:

  1 if the byte is negative, 0 otherwise.