package test;
import java.io.ByteArrayOutputStream;
import java.security.Security;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
/**
*字符串 DESede(3DES) 加密
*/
public class Test3DES {
private static final String Algorithm = "DESede"; // 定义 加密算法,可用 DES,DESede,Blowfish
private static final String hexString="0123456789ABCDEF";
/**
*
* @param keybyte 加密密钥，长度为24字节
* @param src 字节数组(根据给定的字节数组构造一个密钥。 )
* @return
*/
public static byte[] encryptMode(byte[] keybyte, byte[] src) {
try {
// 根据给定的字节数组和算法构造一个密钥
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;
}
/**
*
* @param keybyte 密钥
* @param src 需要解密的数据
* @return
*/
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;
}
/**
* 字符串转为16进制
* @param str
* @return
*/
public static String encode(String str)
{
//根据默认编码获取字节数组
byte[] bytes=str.getBytes();
StringBuilder sb=new StringBuilder(bytes.length*2);
//将字节数组中每个字节拆解成2位16进制整数
for(int i=0;i<bytes.length;i++)
{
sb.append(hexString.charAt((bytes[i]&0xf0)>>4));
sb.append(hexString.charAt((bytes[i]&0x0f)>>0));
}
return sb.toString();
}
/**
*
* @param bytes
* @return
* 将16进制数字解码成字符串,适用于所有字符（包括中文）
*/
public static String decode(String bytes)
{
ByteArrayOutputStream baos=new ByteArrayOutputStream(bytes.length()/2);
//将每2位16进制整数组装成一个字节
for(int i=0;i<bytes.length();i+=2)
baos.write((hexString.indexOf(bytes.charAt(i))<<4 |hexString.indexOf(bytes.charAt(i+1))));
return new String(baos.toByteArray());
}
// 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
//这里addProvider方法是增加一个新的加密算法提供者(个人理解没有找到好的答案,求补充)
// Security.addProvider(new com.sun.crypto.provider.SunJCE());
//byte数组(用来生成密钥的)
final byte[] keyBytes = { 0x11, 0x22, 0x4F, 0x58, (byte)0x88, 0x10,
0x40, 0x38, 0x28, 0x25, 0x79, 0x51, (byte) 0xCB, (byte) 0xDD,
0x55, 0x63, 0x77, 0x29, 0x74, (byte) 0x98, 0x30, 0x40, 0x36,
(byte) 0xE2 };
String szSrc = "This";
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));
//------------------------------------------------------------
System.out.println("---------------------------------------");
String byt="字符串转换为16进制";
byt=encode(byt);
System.out.println(byt);
byt=decode(byt);
System.out.println(byt);
}
}