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package com.sun.crypto.provider;

import java.security.*;
import java.security.spec.*;

import javax.crypto.*;
import javax.crypto.spec.RC2ParameterSpec;

JCE CipherSpi for the RC2(tm) algorithm as described in RFC 2268. The real code is in CipherCore and RC2Crypt.
Author: Andreas Sterbenz
Since: 1.5
/** * JCE CipherSpi for the RC2(tm) algorithm as described in RFC 2268. * The real code is in CipherCore and RC2Crypt. * * @since 1.5 * @author Andreas Sterbenz */
public final class RC2Cipher extends CipherSpi { // internal CipherCore & RC2Crypt objects which do the real work. private final CipherCore core; private final RC2Crypt embeddedCipher; public RC2Cipher() { embeddedCipher = new RC2Crypt(); core = new CipherCore(embeddedCipher, 8); } protected void engineSetMode(String mode) throws NoSuchAlgorithmException { core.setMode(mode); } protected void engineSetPadding(String paddingScheme) throws NoSuchPaddingException { core.setPadding(paddingScheme); } protected int engineGetBlockSize() { return 8; } protected int engineGetOutputSize(int inputLen) { return core.getOutputSize(inputLen); } protected byte[] engineGetIV() { return core.getIV(); } protected AlgorithmParameters engineGetParameters() { return core.getParameters("RC2"); } protected void engineInit(int opmode, Key key, SecureRandom random) throws InvalidKeyException { embeddedCipher.initEffectiveKeyBits(0); core.init(opmode, key, random); } protected void engineInit(int opmode, Key key, AlgorithmParameterSpec params, SecureRandom random) throws InvalidKeyException, InvalidAlgorithmParameterException { if (params != null && params instanceof RC2ParameterSpec) { embeddedCipher.initEffectiveKeyBits (((RC2ParameterSpec)params).getEffectiveKeyBits()); } else { embeddedCipher.initEffectiveKeyBits(0); } core.init(opmode, key, params, random); } protected void engineInit(int opmode, Key key, AlgorithmParameters params, SecureRandom random) throws InvalidKeyException, InvalidAlgorithmParameterException { if (params != null && params.getAlgorithm().equals("RC2")) { try { RC2ParameterSpec rc2Params = params.getParameterSpec(RC2ParameterSpec.class); engineInit(opmode, key, rc2Params, random); } catch (InvalidParameterSpecException ipse) { throw new InvalidAlgorithmParameterException ("Wrong parameter type: RC2 expected"); } } else { embeddedCipher.initEffectiveKeyBits(0); core.init(opmode, key, params, random); } } protected byte[] engineUpdate(byte[] in, int inOfs, int inLen) { return core.update(in, inOfs, inLen); } protected int engineUpdate(byte[] in, int inOfs, int inLen, byte[] out, int outOfs) throws ShortBufferException { return core.update(in, inOfs, inLen, out, outOfs); } protected byte[] engineDoFinal(byte[] in, int inOfs, int inLen) throws IllegalBlockSizeException, BadPaddingException { return core.doFinal(in, inOfs, inLen); } protected int engineDoFinal(byte[] in, int inOfs, int inLen, byte[] out, int outOfs) throws IllegalBlockSizeException, ShortBufferException, BadPaddingException { return core.doFinal(in, inOfs, inLen, out, outOfs); } protected int engineGetKeySize(Key key) throws InvalidKeyException { byte[] keyBytes = CipherCore.getKeyBytes(key); RC2Crypt.checkKey(key.getAlgorithm(), keyBytes.length); return keyBytes.length << 3; } protected byte[] engineWrap(Key key) throws IllegalBlockSizeException, InvalidKeyException { return core.wrap(key); } protected Key engineUnwrap(byte[] wrappedKey, String wrappedKeyAlgorithm, int wrappedKeyType) throws InvalidKeyException, NoSuchAlgorithmException { return core.unwrap(wrappedKey, wrappedKeyAlgorithm, wrappedKeyType); } }