Constructor Detail

• ECNRSigner

  public ECNRSigner()

Method Detail

• init

  public void init​(boolean forSigning,
                   CipherParameters param)

  Description copied from interface: DSA
  initialise the signer for signature generation or signature verification.

  Specified by:

  init in interface DSA

  Parameters:

  forSigning - true if we are generating a signature, false otherwise.

  param - key parameters for signature generation.

• generateSignature

  public java.math.BigInteger[] generateSignature​(byte[] digest)

  generate a signature for the given message using the key we were initialised with. Generally, the order of the curve should be at least as long as the hash of the message of interest, and with ECNR it *must* be at least as long.

  Specified by:

  generateSignature in interface DSA

  Parameters:

  digest - the digest to be signed.

  Returns:

  two big integers representing the r and s values respectively.

  Throws:

  DataLengthException - if the digest is longer than the key allows

• verifySignature

  public boolean verifySignature​(byte[] digest,
                                 java.math.BigInteger r,
                                 java.math.BigInteger s)

  return true if the value r and s represent a signature for the message passed in. Generally, the order of the curve should be at least as long as the hash of the message of interest, and with ECNR, it *must* be at least as long. But just in case the signer applied mod(n) to the longer digest, this implementation will apply mod(n) during verification.

  Specified by:

  verifySignature in interface DSA

  Parameters:

  digest - the digest to be verified.

  r - the r value of the signature.

  s - the s value of the signature.

  Throws:

  DataLengthException - if the digest is longer than the key allows