http://www.bouncycastle.org/java.html: The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5 to JDK 1.7. 
package org.bouncycastle.openssl;


call back to allow a password to be fetched when one is requested.

/**
 * call back to allow a password to be fetched when one is requested.
 */
public interface PasswordFinder
{
    public char[] getPassword();
}