数据加密标准DES的程序,最后是java的,

数据加密标准DES的程序,最后是java的,
数据加密标准DES的程序,最后是java的,

数据加密标准DES的程序,最后是java的,
.security.*;
import javax.crypto.*;
import javax.crypto.spec.SecretKeySpec;
public class ThreeDes {
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 = "This is a 3DES test.测试";
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)));
}
}