com.aqnote.shared.cryptology.symmetric.DES.java Source code

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Here is the source code for com.aqnote.shared.cryptology.symmetric.DES.java

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/*
 * Copyright 2013-2023 "Peng Li"<aqnote@qq.com> Licensed under the AQNote License, Version 1.0 (the "License");
 * you may not use this file except in compliance with the License. You may obtain a copy of the License at
 * http://www.aqnote.com/licenses/LICENSE-1.0 Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied. See the License for the specific language governing permissions and limitations under the
 * License.
 */
package com.aqnote.shared.cryptology.symmetric;

import java.io.UnsupportedEncodingException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.spec.InvalidKeySpecException;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;

import org.apache.commons.codec.DecoderException;
import org.apache.commons.codec.binary.Hex;

/**
 * DesEncrypt.java??DES/
 * 
 * @author "Peng Li"<aqnote@qq.com> May 7, 2012 3:04:12 PM
 */
public class DES {

    private static final String ALGORITHM = "DES";
    private static final String ENCODE_UTF_8 = "UTF-8";

    private static Cipher encodeCipher;
    private static Cipher decodeCipher;

    static {
        generateCipher("www.aqnote.com");
    }

    public synchronized static byte[] encrypt(byte[] plaintext) {
        try {
            if (plaintext == null) {
                return null;
            }
            return encodeCipher.doFinal(plaintext);
        } catch (IllegalStateException e) {
            throw new RuntimeException(e);
        } catch (IllegalBlockSizeException e) {
            throw new RuntimeException(e);
        } catch (BadPaddingException e) {
            throw new RuntimeException(e);
        }
    }

    public synchronized static String encrypt(String plaintext) {
        try {
            if (plaintext == null) {
                return null;
            }
            return new String(Hex.encodeHex(encodeCipher.doFinal(plaintext.getBytes(ENCODE_UTF_8))));
        } catch (IllegalStateException e) {
            throw new RuntimeException(e);
        } catch (IllegalBlockSizeException e) {
            throw new RuntimeException(e);
        } catch (BadPaddingException e) {
            throw new RuntimeException(e);
        } catch (UnsupportedEncodingException e) {
            throw new RuntimeException(e);
        }
    }

    public synchronized static byte[] decrypt(byte[] cryptotext) {
        try {
            if (cryptotext == null) {
                return null;
            }
            return decodeCipher.doFinal(cryptotext);
        } catch (IllegalStateException e) {
            throw new RuntimeException(e);
        } catch (IllegalBlockSizeException e) {
            throw new RuntimeException(e);
        } catch (BadPaddingException e) {
            throw new RuntimeException(e);
        }
    }

    public synchronized static String decrypt(String cryptotext) {
        try {
            byte[] clearByte;
            if (cryptotext == null) {
                return null;
            }
            clearByte = decodeCipher.doFinal(Hex.decodeHex(cryptotext.toCharArray()));
            return new String(clearByte, ENCODE_UTF_8);
        } catch (IllegalStateException e) {
            throw new RuntimeException(e);
        } catch (IllegalBlockSizeException e) {
            throw new RuntimeException(e);
        } catch (BadPaddingException e) {
            throw new RuntimeException(e);
        } catch (UnsupportedEncodingException e) {
            throw new RuntimeException(e);
        } catch (DecoderException e) {
            throw new RuntimeException(e);
        }
    }

    // ???
    private static void generateCipher(String rawKey) {
        try {
            DESKeySpec dks = new DESKeySpec(rawKey.getBytes());
            SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(ALGORITHM);
            SecretKey deskey = keyFactory.generateSecret(dks);
            encodeCipher = Cipher.getInstance(ALGORITHM);
            encodeCipher.init(Cipher.ENCRYPT_MODE, deskey);
            decodeCipher = Cipher.getInstance(ALGORITHM);
            decodeCipher.init(Cipher.DECRYPT_MODE, deskey);
        } catch (InvalidKeyException e) {
            throw new RuntimeException(e);
        } catch (NoSuchAlgorithmException e) {
            throw new RuntimeException(e);
        } catch (InvalidKeySpecException e) {
            throw new RuntimeException(e);
        } catch (NoSuchPaddingException e) {
            throw new RuntimeException(e);
        }
    }
}