Field Detail

• ORDER

  public static final BigInteger ORDER

  ORDER.

Method Detail

• blind

  public static EdDSAPrivateKey blind(EdDSAPrivateKey key,
                                      EdDSAPrivateKey alpha)

  Blind an EdDSA private key. Only for SigType EdDSA_SHA512_Ed25519.

  Parameters:

  key - must be SigType EdDSA_SHA512_Ed25519

  alpha - generated from hash of secret data

  Returns:

  the blinded private key

  Throws:

  UnsupportedOperationException - unless supported

• blind

  public static EdDSAPublicKey blind(EdDSAPublicKey key,
                                     EdDSAPrivateKey alpha)

  Blind an EdDSA key. Only for SigType EdDSA_SHA512_Ed25519.

  Parameters:

  key - must be SigType EdDSA_SHA512_Ed25519

  alpha - generated from hash of secret data

  Returns:

  the blinded public key

  Throws:

  UnsupportedOperationException - unless supported

• reduce

  public static byte[] reduce(byte[] b)

  Reduce a 64-byte value modulo l. Use to generate alpha

  Parameters:

  b - 64 bytes little endian of random

  Returns:

  32 bytes little endian mod l

• unblind

  public static EdDSAPrivateKey unblind(EdDSAPrivateKey key,
                                        EdDSAPrivateKey alpha)

  Unblind an EdDSA key using alpha. Unimplemented, probably not needed except for testing.

  Parameters:

  key - must be SigType EdDSA_SHA512_Ed25519

  alpha - generated from hash of secret data

  Returns:

  the unblinded private key

  Throws:

  UnsupportedOperationException - unless supported