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import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.security.DigestInputStream;
import java.security.DigestOutputStream;
import java.security.MessageDigest;
import java.security.Security;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
/**
 * Basic IO example using SHA1
 */
public class MainClass {
  public static void main(String[] args) throws Exception {
    Security.addProvider(new BouncyCastleProvider());        
    byte[] input = "www.rntsoft.com".getBytes();
    System.out.println("input     : " + new String(input));    
    MessageDigest hash = MessageDigest.getInstance("SHA1");
    ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(input);
    DigestInputStream digestInputStream = new DigestInputStream(byteArrayInputStream, hash);
    ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
    int ch;
    while ((ch = digestInputStream.read()) >= 0) {
      byteArrayOutputStream.write(ch);
    }
    byte[] newInput = byteArrayOutputStream.toByteArray();
    System.out.println("in digest : " + new String(digestInputStream.getMessageDigest().digest()));
    byteArrayOutputStream = new ByteArrayOutputStream();
    DigestOutputStream digestOutputStream = new DigestOutputStream(byteArrayOutputStream, hash);
    digestOutputStream.write(newInput);
    digestOutputStream.close();
    System.out.println("out digest: " + new String(digestOutputStream.getMessageDigest().digest()));
  }
}
           
       
BasicIOexampleusingSHA1.zip( 1,198 k)