想要个JAVA 3DES加密算法的例子。谢谢!
要能把下面的还原。
加密后的字符:n2wx+QxsX4JAJb0ted93KeYdrEl6sr9sAeZ7d8ptAqK2hq7DtKnirOd02EnkYVWt 解密需要的:key=hello,initial vector key=0

解决方案 »

  1.   

    import java.security.*;
    import javax.crypto.*;
    import javax.crypto.spec.SecretKeySpec;public class Test3Des {    private static final String Algorithm = "DESede"; //定义 加密算法,可用 DES,DESede,Blowfish    //keybyte为加密密钥,长度为24字节
        //src为被加密的数据缓冲区(源)
        public static byte[] encryptMode(byte[] keybyte, byte[] src) {
           try {
                //生成密钥
                SecretKey deskey = new SecretKeySpec(keybyte, Algorithm);            //加密
                Cipher c1 = Cipher.getInstance(Algorithm);
                c1.init(Cipher.ENCRYPT_MODE, deskey);
                return c1.doFinal(src);
            } catch (java.security.NoSuchAlgorithmException e1) {
                e1.printStackTrace();
            } catch (javax.crypto.NoSuchPaddingException e2) {
                e2.printStackTrace();
            } catch (java.lang.Exception e3) {
                e3.printStackTrace();
            }
            return null;
        }    //keybyte为加密密钥,长度为24字节
        //src为加密后的缓冲区
        public static byte[] decryptMode(byte[] keybyte, byte[] src) {
     try {
                //生成密钥
                SecretKey deskey = new SecretKeySpec(keybyte, Algorithm);            //解密
                Cipher c1 = Cipher.getInstance(Algorithm);
                c1.init(Cipher.DECRYPT_MODE, deskey);
                return c1.doFinal(src);
            } catch (java.security.NoSuchAlgorithmException e1) {
                e1.printStackTrace();
            } catch (javax.crypto.NoSuchPaddingException e2) {
                e2.printStackTrace();
            } catch (java.lang.Exception e3) {
                e3.printStackTrace();
            }
            return null;
        }    //转换成十六进制字符串
        public static String byte2hex(byte[] b) {
            String hs="";
            String stmp="";        for (int n=0;n<b.length;n++) {
                stmp=(java.lang.Integer.toHexString(b[n] & 0XFF));
                if (stmp.length()==1) hs=hs+"0"+stmp;
                else hs=hs+stmp;
                if (n<b.length-1)  hs=hs+":";
            }
            return hs.toUpperCase();
        }    public static void main(String[] args)
        {
            //添加新安全算法,如果用JCE就要把它添加进去
            Security.addProvider(new com.sun.crypto.provider.SunJCE());        final byte[] keyBytes = {0x11, 0x22, 0x4F, 0x58, (byte)0x88, 0x10, 0x40, 0x38
                                   , 0x28, 0x25, 0x79, 0x51, (byte)0xCB, (byte)0xDD, 0x55, 0x66
                                   , 0x77, 0x29, 0x74, (byte)0x98, 0x30, 0x40, 0x36, (byte)0xE2}; //24字节的密钥
            String szSrc = "my name is Sidney.";        System.out.println("加密前的字符串:" + szSrc);        byte[] encoded = encryptMode(keyBytes, szSrc.getBytes());
            System.out.println("加密后的字符串:" + new String(encoded));        byte[] srcBytes = decryptMode(keyBytes, encoded);
            System.out.println("解密后的字符串:" + (new String(srcBytes)));
        }
    }