字符串desede 3des加密示例分享

/*字符串 desede(3des) 加密*/
import java.security.security;
import javax.crypto.cipher;
import javax.crypto.secretkey;
import javax.crypto.spec.secretkeyspec;
import sun.misc.base64decoder;
import sun.misc.base64encoder;

public class des3 {

 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 string 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);
   // 开始加密运算
   byte[] encryptedbytearray = c1.dofinal(src);
   // 加密运算之后 将byte[]转化为base64的string
   base64encoder enc = new base64encoder();
   return enc.encode(encryptedbytearray);
  }
  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, string 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);
   // 解密运算之前
   base64decoder dec = new base64decoder();
   byte[] encryptedbytearray = dec.decodebuffer(src);
   // 解密运算 将base64的string转化为byte[]
   return c1.dofinal(encryptedbytearray);

  } 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 = "this is a 3des test. 测试";
  system.out.println("加密前的字符串:" + szsrc);

  string encoded = encryptmode(keybytes, szsrc.getbytes());
  system.out.println("加密后的字符串:" + encoded);

  byte[] srcbytes = decryptmode(keybytes, encoded);
  system.out.println("解密后的字符串:" + (new string(srcbytes)));
 }
}