java des加密与解密

来源：互联网发布：淘宝客需要什么软件编辑：程序博客网时间：2024/05/16 01:07
package com.suning.ebuy.hyj.treaty.util;import java.security.Key;import java.security.SecureRandom;import javax.crypto.Cipher;import javax.crypto.KeyGenerator;import sun.misc.BASE64Decoder;import sun.misc.BASE64Encoder;   public class DesUtil {Key key;public DesUtil(String str) {    setKey(str);//生成密匙}public DesUtil() {    setKey("siyue_qi");}/**   * 根据参数生成KEY   */public void setKey(String strKey) {      try {        KeyGenerator _generator = KeyGenerator.getInstance("DES");        _generator.init(new SecureRandom(strKey.getBytes()));        this.key = _generator.generateKey();        _generator = null;      } catch (Exception e) {        throw new RuntimeException(            "Error initializing SqlMap class. Cause: " + e);      }}/**   * 加密String明文输入,String密文输出   */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) {        throw new RuntimeException(            "Error initializing SqlMap class. Cause: " + e);      } finally {        base64en = null;        byteMing = null;        byteMi = null;      }      return strMi;}/**   * 解密 以String密文输入,String明文输出   * @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) {        throw new RuntimeException(            "Error initializing SqlMap class. Cause: " + e);      } finally {        base64De = null;        byteMing = null;        byteMi = null;      }      return strMing;}/**   * 加密以byte[]明文输入,byte[]密文输出   * @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) {        throw new RuntimeException(            "Error initializing SqlMap class. Cause: " + e);      } finally {        cipher = null;      }      return byteFina;}/**   * 解密以byte[]密文输入,以byte[]明文输出   * @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) {        throw new RuntimeException(            "Error initializing SqlMap class. Cause: " + e);      } finally {        cipher = null;      }      return byteFina;}public static void main(String args[]) {DesUtil des = new DesUtil();      // 设置密钥      //des.setKey("12345678");      String str1 = "0";      //DES加密      String str2 = des.getEncString(str1);      String deStr = des.getDesString(str2);      System.out.println("密文:" + str2);      //DES解密      System.out.println("明文:" + deStr);}}
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