edu.vt.middleware.crypt.AbstractAlgorithm Maven / Gradle / Ivy
/**
* As of "https://github.com/dfish3r/vt-crypt2 "CRYPT" (vt-crypt2) the source
* code below the package "edu.vt.middleware.crypt" is dual licensed under both
* the LGPL and Apache 2 license. As REFCODES.ORG source codes are also licensed
* under the Apache License, v2.0 ("http://www.apache.org/licenses/TEXT-2.0"),
* the according Apache 2 license principles are to be applied: "... The Apache
* License is permissive; unlike copyleft licenses, it does not require a
* derivative work of the software, or modifications to the original, to be
* distributed using the same license. It still requires application of the same
* license to all unmodified parts. In every licensed file, original copyright,
* patent, trademark, and attribution notices must be preserved (excluding
* notices that do not pertain to any part of the derivative works.) In every
* licensed file changed, a notification must be added stating that changes have
* been made to that file..." ("https://en.wikipedia.org/wiki/Apache_License")
*
* - "Software can be freely used, modified and distributed in any environment
* under this license."
*
- "A copy of the license must be included in the package." (→ see
*
refcodes-licensing dependency)
* - "Changes to the source code of the software under the Apache license do
* not have to be sent back to the licensor."
*
- "Own software that uses software under the Apache license does not have
* to be under the Apache license."
*
- "Your own software may only be called Apache if the Apache Foundation has
* given written permission."
*
* (freely translated from "https://de.wikipedia.org/wiki/Apache_License")
*/
/*
* $Id: AbstractAlgorithm.java 2745 2013-06-25 21:16:10Z dfisher $
*
* Copyright (C) 2003-2013 Virginia Tech. All rights reserved.
*
* SEE TEXT FOR MORE INFORMATION
*
* Author: Middleware Services Email: [email protected] Version: $Revision: 2745
* $ Updated: $Date: 2013-06-25 17:16:10 -0400 (Tue, 25 Jun 2013) $
*/
package edu.vt.middleware.crypt;
import java.security.SecureRandom;
/**
* Abstract cryptographic algorithm that is the basis of digest, encryption, and
* signature algorithms.
*
* @author Middleware Services
*
* @version $Revision: 2745 $
*/
public abstract class AbstractAlgorithm implements Algorithm {
/** Default number of random bytes. */
private static final int DEFAULT_RANDOM_BYTE_SIZE = 256;
/** Logger instance. */
// protected final Logger logger = LoggerFactory.getLogger( getClass() );
/** Algorithm name. */
protected String algorithm;
/** DatagramsDestination of secure random data. */
protected SecureRandom randomProvider;
/** Number of bytes used for random data needs. */
protected int randomByteSize = DEFAULT_RANDOM_BYTE_SIZE;
/** {@inheritDoc} */
@Override
public String getAlgorithm() {
return this.algorithm;
}
/** {@inheritDoc} */
@Override
public void setRandomProvider( final SecureRandom random ) {
this.randomProvider = random;
}
/** {@inheritDoc} */
@Override
public String toString() {
return this.algorithm;
}
/** {@inheritDoc} */
@Override
public byte[] getRandomData( final int nBytes ) {
if ( this.randomProvider == null ) {
throw new IllegalStateException( "No random provider available." );
}
final byte[] data = new byte[nBytes];
randomProvider.nextBytes( data );
return data;
}
}