Bouncy castle???

Question

can v use bouncy castle api's in java????
i have used it in j2me....can it also b used with standard edition???

Answer 1

There must be some tutorial information on their website. I know they have an examples on http://www.bouncycastle.org/documentation.html. Basically, you can use it in two ways. One way is exclusively through the JCE. You use the same Java classes like Cipher, MessageDigest, Signature, etc, but you explicitly specify the provider in the getInstance method. Here is small code fragment example
import java.io.*;
import java.security.*;
import javax.crypto.*;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
public class BCastle1
    public static void main(String[] args) throws Exception
        Security.addProvider(new BouncyCastleProvider());
        // "BC" is the name of the BouncyCastle provider
        KeyGenerator keyGen = KeyGenerator.getInstance("DES", "BC");
        keyGen.init(new SecureRandom());
        Key key = keyGen.generateKey();
        Cipher encrypt = Cipher.getInstance("DES/CBC/PKCS5Padding", "BC");
        encrypt.init(Cipher.ENCRYPT_MODE, key);
        ByteArrayOutputStream bOut = new ByteArrayOutputStream();
        CipherOutputStream cOut = new CipherOutputStream(bOut, encrypt);
        // ... other stuff omitted ....
}Another way is to use the lightweight API directly. You use the classes whose Javadocs are at http://www.bouncycastle.org/docs/docs1.5/index.html just like any other Java classes.