package com.siro.tools;
import java.security.*;
import javax.crypto.*;
public class DESPlus {
public static String encrypt(String strKey, String strIn) throws Exception {
Security.addProvider(new com.sun.crypto.provider.SunJCE());
Key key = getKey(strKey);
Cipher encryptCipher = Cipher.getInstance("DES");
encryptCipher.init(Cipher.ENCRYPT_MODE, key);
return byteArr2HexStr(encryptCipher.doFinal((strIn.getBytes())));
}
public static String decrypt(String strKey, String strIn) throws Exception {
Security.addProvider(new com.sun.crypto.provider.SunJCE());
Key key = getKey(strKey);
Cipher decryptCipher = Cipher.getInstance("DES");
decryptCipher.init(Cipher.DECRYPT_MODE, key);
return new String(decryptCipher.doFinal((hexStr2ByteArr(strIn))));
}
private static Key getKey(String strKey) throws Exception {
byte[] arrBTmp = strKey.getBytes();
byte[] arrB = new byte[8];
for(int i = 0; i < arrBTmp.length && i < arrB.length; i++) {
arrB[i] = arrBTmp[i];
}
Key key = new javax.crypto.spec.SecretKeySpec(arrB, "DES");
return key;
}
private static String byteArr2HexStr(byte[] arrB) throws Exception {
int iLen = arrB.length;
StringBuffer sb = new StringBuffer(iLen * 2);
for (int i = 0; i < iLen; i++) {
int intTmp = arrB[i];
while (intTmp < 0) {
intTmp = intTmp + 256;
}
if (intTmp < 16) {
sb.append("0");
}
sb.append(Integer.toString(intTmp, 16));
}
return sb.toString();
}
private static byte[] hexStr2ByteArr(String strIn) throws Exception {
byte[] arrB = strIn.getBytes();
int iLen = arrB.length;
byte[] arrOut = new byte[iLen / 2];
for (int i = 0; i < iLen; i = i + 2) {
String strTmp = new String(arrB, i, 2);
arrOut[i / 2] = (byte) Integer.parseInt(strTmp, 16);
}
return arrOut;
}
public static void main(String[] args) {
try {
String Code = "中B123";
String key = "1q2w3e4r";
String codE;
codE = DESPlus.encrypt(key, Code);
System.out.println("加密前的字串:" + Code);
System.out.println("加密所用密钥:" + key);
System.out.println("加密后的字串:" + codE);
System.out.println("解密后的字串:" + DESPlus.decrypt(key, codE));
} catch (Exception e) {
e.printStackTrace();
}
}
}