android DES加密解密

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package com.junhui.gaode.EncryptionUtil;import android.util.Base64;import java.security.InvalidAlgorithmParameterException;import java.security.InvalidKeyException;import java.security.NoSuchAlgorithmException;import javax.crypto.BadPaddingException;import javax.crypto.Cipher;import javax.crypto.IllegalBlockSizeException;import javax.crypto.NoSuchPaddingException;import javax.crypto.spec.IvParameterSpec;import javax.crypto.spec.SecretKeySpec;/** * Created by 骏辉出行 on 2017/5/11. */public class DES {    //初始化向量，随意填写    private static byte[]iv={1,2,3,4,5,6,7,8};    /**     *     * @param encryptString 明文     * @param encryptKey 密钥     * @return 加密后的密文     */    public static String encryptDES(String encryptString,String encryptKey){        try {            //实例化IvParameterSpec对象，使用指定的初始化向量            IvParameterSpec zeroIv=new IvParameterSpec(iv);            //实例化SecretKeySpec，根据传入的密钥获得字节数组来构造SecretKeySpec            SecretKeySpec key =new SecretKeySpec(encryptKey.getBytes(),"DES");            //创建密码器            Cipher cipher=Cipher.getInstance("DES/CBC/PKCS5Padding");            //用密钥初始化Cipher对象            cipher.init(Cipher.ENCRYPT_MODE,key,zeroIv);            //执行加密操作            byte[]encryptedData=cipher.doFinal(encryptString.getBytes());            return Base64.encodeToString(encryptedData,0);        } catch (NoSuchAlgorithmException e) {            e.printStackTrace();        } catch (NoSuchPaddingException e) {            e.printStackTrace();        } catch (InvalidAlgorithmParameterException e) {            e.printStackTrace();        } catch (InvalidKeyException e) {            e.printStackTrace();        } catch (BadPaddingException e) {            e.printStackTrace();        } catch (IllegalBlockSizeException e) {            e.printStackTrace();        }        return null;    }    /**     * 解密的过程与加密的过程大致相同     * @param decryptString 密文     * @param decryptKey 密钥     * @return  返回明文     */    public static String decryptDES(String decryptString,String decryptKey){        try {            //先使用Base64解密            byte[]byteMi=Base64.decode(decryptString,0);            //实例化IvParameterSpec对象使用指定的初始化向量            IvParameterSpec zeroIv=new IvParameterSpec(iv);            //实例化SecretKeySpec，根据传入的密钥获得字节数组来构造SecretKeySpec,            SecretKeySpec key=new SecretKeySpec(decryptKey.getBytes(),"DES");            //创建密码器            Cipher cipher=Cipher.getInstance("DES/CBC/PKCS5Padding");            //用密钥初始化Cipher对象,上面是加密，这是解密模式            cipher.init(Cipher.DECRYPT_MODE,key,zeroIv);            //获取解密后的数据            byte [] decryptedData=cipher.doFinal(byteMi);            return new String(decryptedData);        } catch (NoSuchAlgorithmException e) {            e.printStackTrace();        } catch (NoSuchPaddingException e) {            e.printStackTrace();        } catch (InvalidAlgorithmParameterException e) {            e.printStackTrace();        } catch (InvalidKeyException e) {            e.printStackTrace();        } catch (BadPaddingException e) {            e.printStackTrace();        } catch (IllegalBlockSizeException e) {            e.printStackTrace();        }        return null;    }}
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