SignVerifyHashedData.java

Example of signature and verification using hashes of previously computed data.

See Note on examples.

package doxy.examples;
 
import com.dinamonetworks.Dinamo;
 
import br.com.trueaccess.TacException;
import br.com.trueaccess.TacNDJavaLib;
 
public class SignVerifyHashedData {
 
    public static void main(String[] args) throws TacException {
 
        Dinamo api = new Dinamo();
        api.openSession("127.0.0.1", "master", "12345678", false);
 
        String message = "teste teste teste";
 
        byte bHash[] =
        {
            (byte)0x8F, (byte)0xB2, (byte)0x76, (byte)0x64, (byte)0x9F, (byte)0x23, (byte)0xCE, (byte)0xCF, (byte)0x02, (byte)0x8B, (byte)0xA1, (byte)0xEF, (byte)0xF4, (byte)0x25, (byte)0x38, (byte)0xE3,
            (byte)0x0A, (byte)0x0C, (byte)0x56, (byte)0x0F, (byte)0xE5, (byte)0x66, (byte)0x82, (byte)0x8E, (byte)0xBB, (byte)0xA5, (byte)0x7C, (byte)0x56, (byte)0x8E, (byte)0x79, (byte)0x33, (byte)0x54,
        } ;
 
        String keyId = "rsa";
 
        api.createKey(keyId, TacNDJavaLib.ALG_RSA_2048);
 
        //Assina utilizando o nome da chave
        byte[] signature = api.signHashedData(keyId, TacNDJavaLib.ALG_SHA2_256, bHash);
 
        api.verifySignature(keyId, TacNDJavaLib.ALG_SHA2_256, signature, message.getBytes());
 
        //Assina utilizando key handle
        byte[] privateKeyHandle = api.getUserKey(keyId);
        signature = api.signHashedData(privateKeyHandle, TacNDJavaLib.ALG_SHA2_256, bHash, 0);
        api.releaseKeyHandle(privateKeyHandle);
 
        api.verifySignature(keyId, TacNDJavaLib.ALG_SHA2_256, signature, message.getBytes());
 
        api.deleteKey(keyId);
 
        api.closeSession();
 
    }
 
}