Sign and SignVerify Data using an EC Key

To Sign and SignVerify data using an EC key:

1. Create a NAE Session. Pass the NAE username, password, property file path as arguments.

   
   NaeSession session = new NaeSession(user, passwd, propFilePath);
   

2. Create NaeECIESKey object. Pass NaeSession object and curve as argument.

   
   NaeECIESKey ecKey = new NaeECIESKey (session, curve);
   

   Curve can be set to NaeECIESKey.SupportedCurves.brainpoolP256r1_256

3. Set the Hash algorithm.

   
   HashAlgorithmName algorithm = HashAlgorithmName.SHA256;
   

4. Call the SignData API and pass input bytes, hashing algorithm name as arguments to get the signed bytes.

   
   byte[] outBytes = ecKey.SignData(inputBytes, hashalgorithm);
   

5. Call the VerifyData API. Pass the signed bytes, input bytes, offset, count, and hashing algorithm name as arguments for the verification of signed data.

   
   bool result = ecKey.VerifyData(inputBytes, offset, count, outBytes, hashalgorithm);