package com.home.testdes; import android.os.Bundle; import android.util.Log; import android.app.Activity; public class MainActivity extends Activity {  @Override  protected void onCreate(Bundle savedInstanceState) {   super.onCreate(savedInstanceState);   DESUtil u = new DESUtil();   String mi = u.getEnc("I love you");   Log.i("加密后", mi);   String ming = u.getDec(mi);   Log.i("解密后", ming);  } }

package com.home.testdes; import java.security.Key; import java.security.spec.AlgorithmParameterSpec; import javax.crypto.Cipher; import javax.crypto.SecretKeyFactory; import javax.crypto.spec.DESKeySpec; import javax.crypto.spec.IvParameterSpec; import android.util.Base64; /**  * 使用DES加密和解密工具类  *  * @author Administrator  *  */ public class DESUtil {  private Key key;// 密钥的key值  private byte[] DESkey;  private byte[] DESIV = { 0x12, 0x34, 0x56, 0x78, (byte) 0x90, (byte) 0xAB,    (byte) 0xCD, (byte) 0xEF };  private AlgorithmParameterSpec iv = null;// 加密算法的参数接口  public DESUtil() {   try {    this.DESkey = "abcdefghijk".getBytes("UTF-8");// 设置密钥    DESKeySpec keySpec = new DESKeySpec(DESkey);// 设置密钥参数    iv = new IvParameterSpec(DESIV);// 设置向量    SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");// 获得密钥工厂    key = keyFactory.generateSecret(keySpec);// 得到密钥对象   } catch (Exception e) {    e.printStackTrace();   }  }  /**   * 加密String 明文输入密文输出   *   * @param inputString   *            待加密的明文   * @return 加密后的字符串   */  public String getEnc(String inputString) {   byte[] byteMi = null;   byte[] byteMing = null;   String outputString = "";   try {    byteMing = inputString.getBytes("UTF-8");    byteMi = this.getEncCode(byteMing);    byte[] temp = Base64.encode(byteMi, Base64.DEFAULT);    outputString = new String(temp);   } catch (Exception e) {   } finally {    byteMing = null;    byteMi = null;   }   return outputString;  }  /**   * 解密String 以密文输入明文输出   *   * @param inputString   *            需要解密的字符串   * @return 解密后的字符串   */  public String getDec(String inputString) {   byte[] byteMing = null;   byte[] byteMi = null;   String strMing = "";   try {    byteMi = Base64.decode(inputString.getBytes(), Base64.DEFAULT);    byteMing = this.getDesCode(byteMi);    strMing = new String(byteMing, "UTF8");   } catch (Exception e) {   } finally {    byteMing = null;    byteMi = null;   }   return strMing;  }  /**   * 加密以byte[]明文输入,byte[]密文输出   *   * @param bt   *            待加密的字节码   * @return 加密后的字节码   */  private byte[] getEncCode(byte[] bt) {   byte[] byteFina = null;   Cipher cipher;   try {    // 得到Cipher实例    cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");    cipher.init(Cipher.ENCRYPT_MODE, key, iv);    byteFina = cipher.doFinal(bt);   } catch (Exception e) {    e.printStackTrace();   } finally {    cipher = null;   }   return byteFina;  }  /**   * 解密以byte[]密文输入,以byte[]明文输出   *   * @param bt   *            待解密的字节码   * @return 解密后的字节码   */  private byte[] getDesCode(byte[] bt) {   Cipher cipher;   byte[] byteFina = null;   try {    // 得到Cipher实例    cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");    cipher.init(Cipher.DECRYPT_MODE, key, iv);    byteFina = cipher.doFinal(bt);   } catch (Exception e) {    e.printStackTrace();   } finally {    cipher = null;   }   return byteFina;  } }