/*********************************************************************************
* TotalCross Software Development Kit *
* Copyright (C) 2000-2012 SuperWaba Ltda. *
* All Rights Reserved *
* *
* This library and virtual machine is distributed in the hope that it will *
* be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. *
* *
* This file is covered by the GNU LESSER GENERAL PUBLIC LICENSE VERSION 3.0 *
* A copy of this license is located in file license.txt at the root of this *
* SDK or can be downloaded here: *
* http://www.gnu.org/licenses/lgpl-3.0.txt *
* *
*********************************************************************************/
package totalcross.crypto.digest;
import java.security.*;
import totalcross.crypto.NoSuchAlgorithmException;
/**
* This class implements the SHA-256 message digest algorithm.
*/
public class SHA256Digest extends Digest
{
/**
* Creates a new SHA256Digest object.
*
* @throws NoSuchAlgorithmException If no Provider supports a <code>MessageDigestSpi</code> implementation for the specified algorithm.
*/
public SHA256Digest() throws NoSuchAlgorithmException
{
try
{
digestRef = MessageDigest.getInstance("SHA-256");
}
catch (java.security.NoSuchAlgorithmException e)
{
throw new NoSuchAlgorithmException(e.getMessage());
}
}
/**
* Returns the name of the algorithm.
*
* @return "SHA-256".
*/
public final String getAlgorithm()
{
return "SHA-256";
}
/**
* Returns the block length.
*
* @return 64.
*/
public final int getBlockLength()
{
return 64;
}
/**
* Returns the message digest length.
*
* @return 32.
*/
public final int getDigestLength()
{
return 32;
}
protected final byte[] process(byte[] data)
{
MessageDigest digest = (MessageDigest)digestRef;
digest.reset();
digest.update(data);
return ((MessageDigest)digestRef).digest();
}
}