數(shù)據(jù)結(jié)構(gòu)算法:JAVA中3des加密算法

package test;
    import java.security.Key;
    import java.security.SecureRandom;
    import javax.crypto.Cipher;
    import javax.crypto.KeyGenerator;
    import sun.misc.BASE64Decoder;
    import sun.misc.BASE64Encoder;
    /**
    *
    * 使用DES加密與解密,可對(duì)byte[],String類(lèi)型進(jìn)行加密與解密 密文可使用String,byte[]存儲(chǔ).
    *
    * 方法: void getKey(String strKey)從strKey的字條生成一個(gè)Key
    *
    * String getEncString(String strMing)對(duì)strMing進(jìn)行加密,返回String密文 String
    * getDesString(String strMi)對(duì)strMin進(jìn)行解密,返回String明文
    *
    * byte[] getEncCode(byte[] byteS)byte[]型的加密 byte[] getDesCode(byte[]
    * byteD)byte[]型的解密
    */
    public class ThreeDES{
    Key key;
    /**
    * 根據(jù)參數(shù)生成KEY
    *
    * @param strKey
    */
    public void getKey(String strKey) {
    try {
    KeyGenerator _generator = KeyGenerator.getInstance("DES");
    _generator.init(new SecureRandom(strKey.getBytes()));
    this.key = _generator.generateKey();
    _generator = null;
    } catch (Exception e) {
    e.printStackTrace();
    }
    }
    /**
    * 加密String明文輸入,String密文輸出
    *
    * @param strMing
    * @return
    */
    public String getEncString(String strMing) {
    byte[] byteMi = null;
    byte[] byteMing = null;
    String strMi = "";
    BASE64Encoder base64en = new BASE64Encoder();
    try {
    byteMing = strMing.getBytes("UTF8");
    byteMi = this.getEncCode(byteMing);
    strMi = base64en.encode(byteMi);
    } catch (Exception e) {
    e.printStackTrace();
    } finally {
    base64en = null;
    byteMing = null;
    byteMi = null;
    }
    return strMi;
    }
    /**
    * 解密 以String密文輸入,String明文輸出
    *
    * @param strMi
    * @return
    */ 　　public String getDesString(String strMi) {
    BASE64Decoder base64De = new BASE64Decoder();
    byte[] byteMing = null;
    byte[] byteMi = null;
    String strMing = "";
    try {
    byteMi = base64De.decodeBuffer(strMi);
    byteMing = this.getDesCode(byteMi);
    strMing = new String(byteMing, "UTF8");
    } catch (Exception e) {
    e.printStackTrace();
    } finally {
    base64De = null;
    byteMing = null;
    byteMi = null;
    }
    return strMing;
    }
    /**
    * 加密以byte[]明文輸入,byte[]密文輸出
    *
    * @param byteS
    * @return
    */
    private byte[] getEncCode(byte[] byteS) {
    byte[] byteFina = null;
    Cipher cipher;
    try {
    cipher = Cipher.getInstance("DES");
    cipher.init(Cipher.ENCRYPT_MODE, key);
    byteFina = cipher.doFinal(byteS);
    } catch (Exception e) {
    e.printStackTrace();
    } finally {
    cipher = null;
    }
    return byteFina;
    }
    /**
    * 解密以byte[]密文輸入,以byte[]明文輸出
    *
    * @param byteD
    * @return
    */
    private byte[] getDesCode(byte[] byteD) {
    Cipher cipher;
    byte[] byteFina = null;
    try {
    cipher = Cipher.getInstance("DES");
    cipher.init(Cipher.DECRYPT_MODE, key);
    byteFina = cipher.doFinal(byteD);
    } catch (Exception e) {
    e.printStackTrace();
    } finally {
    cipher = null;
    }
    return byteFina;
    }
    public static void main(String[] args) {
    ThreeDES des = new ThreeDES();// 實(shí)例化一個(gè)對(duì)像
    des.getKey("fenglingcompany");// 生成密匙
    String strEnc = des.getEncString("fengye666666666");// 加密字符串,返回String的密文
    System.out.println(strEnc);
    String strDes = des.getDesString(strEnc);// 把String 類(lèi)型的密文解密
    System.out.println(strDes);
    }
    }