package com.nnff.des
import java.security.Security
import javax.crypto.Cipher
import javax.crypto.SecretKey
import javax.crypto.spec.SecretKeySpec
/*字符串 DESede(3DES) 加密
* ECB模式/使用PKCS7方式填充不足位,目前给的密钥是192位
* 3DES（即Triple DES）是DES向AES过渡的加密算法（1999年，NIST将3-DES指定为过渡的
* 加密标准），是DES的一个更安全的变形。它以DES为基本模块，通过组合分组方法设计出分组加
* 密算法，其具体实现如下：设Ek()和Dk()代表DES算法的加密和解密过程，K代表DES算法使用的
* 密钥，P代表明文，C代表密表，这样，
* 3DES加密过程为：C=Ek3(Dk2(Ek1(P)))
* 3DES解密过程为：P=Dk1((EK2(Dk3(C)))
* */
public class ThreeDes {
/**
* @param args在java中调用sun公司提供的3DES加密解密算法时，需要使
* 用到$JAVA_HOME/jre/lib/目录下如下的4个jar包：
*jce.jar
*security/US_export_policy.jar
*security/local_policy.jar
*ext/sunjce_provider.jar
*/
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)//在单一方面的加密或解密
} catch (java.security.NoSuchAlgorithmException e1) {
// TODO: handle exception
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) {
// TODO: handle exception
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=0n<b.lengthn++){
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) {
// TODO Auto-generated method stub
//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)))
}
}
3DES算法是指使用双长度（16字节）密钥K=（KL||KR）将8字节明文数据块进行3次DES加密/解密。如下所示： Y = DES(KL)[DES-1(KR)[DES(KL[X])]] 解密方式为： X = DES-1 (KL)[DES (KR)[ DES-1 (KL[Y])]] 其中，DES(KL[X])表示用密钥K对数据X进行DES加密，DES-1 (KL[Y])表示用密钥K对数据Y进行解密。 SessionKey的计算采用3DES算法，计算出单倍长度的密钥。表示法为:SK = Session(DK，DATA) 3DES加密算法为： VOID 3DES(BYTE DoubleKeyStr[16]， BYTE Data[8]， BYTE Out[8]) { BYTE Buf1[8]， Buf2[8]DES (&DoubleKeyStr[0]， Data， Buf1)UDES(&DoubleKeyStr[8]， Buf1， Buf2)DES (&DoubleKeyStr[0]， Buf2， Out)}有专门方法的，可以参考：import java.security.MessageDigest
import java.util.Arrays
import javax.crypto.Cipher
import javax.crypto.SecretKey
import javax.crypto.spec.IvParameterSpec
import javax.crypto.spec.SecretKeySpec
public class TripleDESTest {
public static void main(String[] args) throws Exception {
String text = "kyle boon"
byte[] codedtext = new TripleDESTest().encrypt(text)
String decodedtext = new TripleDESTest().decrypt(codedtext)
System.out.println(codedtext)// this is a byte array, you'll just see a reference to an array
System.out.println(decodedtext)// This correctly shows "kyle boon"
}
public byte[] encrypt(String message) throws Exception {
final MessageDigest md = MessageDigest.getInstance("md5")
final byte[] digestOfPassword = md.digest("HG58YZ3CR9"
.getBytes("utf-8"))
final byte[] keyBytes = Arrays.copyOf(digestOfPassword, 24)
for (int j = 0, k = 16j <8) {
keyBytes[k++] = keyBytes[j++]
}
final SecretKey key = new SecretKeySpec(keyBytes, "DESede")
final IvParameterSpec iv = new IvParameterSpec(new byte[8])
final Cipher cipher = Cipher.getInstance("DESede/CBC/PKCS5Padding")
cipher.init(Cipher.ENCRYPT_MODE, key, iv)
final byte[] plainTextBytes = message.getBytes("utf-8")
final byte[] cipherText = cipher.doFinal(plainTextBytes)
// final String encodedCipherText = new sun.misc.BASE64Encoder()
// .encode(cipherText)
return cipherText
}
public String decrypt(byte[] message) throws Exception {
final MessageDigest md = MessageDigest.getInstance("md5")
final byte[] digestOfPassword = md.digest("HG58YZ3CR9"
.getBytes("utf-8"))
final byte[] keyBytes = Arrays.copyOf(digestOfPassword, 24)
for (int j = 0, k = 16j <8) {
keyBytes[k++] = keyBytes[j++]
}
final SecretKey key = new SecretKeySpec(keyBytes, "DESede")
final IvParameterSpec iv = new IvParameterSpec(new byte[8])
final Cipher decipher = Cipher.getInstance("DESede/CBC/PKCS5Padding")
decipher.init(Cipher.DECRYPT_MODE, key, iv)
// final byte[] encData = new
// sun.misc.BASE64Decoder().decodeBuffer(message)
final byte[] plainText = decipher.doFinal(message)
return new String(plainText, "UTF-8")
}
}
