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加密解密工具类(Java,DES)

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import java.security.Key;
import java.security.spec.AlgorithmParameterSpec;

import javax.crypto.Cipher;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import javax.crypto.spec.IvParameterSpec;

/**
* 加密解密工具包
*/
public class CyptoUtils {

public static final String ALGORITHM_DES = "DES/CBC/PKCS5Padding";

/**
* DES算法,加密
*
* @param data 待加密字符串
* @param key 加密私钥,长度不能够小于8位
* @return 加密后的字节数组,一般结合Base64编码使用
* @throws InvalidAlgorithmParameterException
* @throws Exception
*/
public static String encode(String key,String data) {
if(data == null)
return null;
try{
DESKeySpec dks = new DESKeySpec(key.getBytes());
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
//key的长度不能够小于8位字节
Key secretKey = keyFactory.generateSecret(dks);
Cipher cipher = Cipher.getInstance(ALGORITHM_DES);
IvParameterSpec iv = new IvParameterSpec("12345678".getBytes());
AlgorithmParameterSpec paramSpec = iv;
cipher.init(Cipher.ENCRYPT_MODE, secretKey,paramSpec);
byte[] bytes = cipher.doFinal(data.getBytes());
return byte2hex(bytes);
}catch(Exception e){
e.printStackTrace();
return data;
}
}

/**
* DES算法,解密
*
* @param data 待解密字符串
* @param key 解密私钥,长度不能够小于8位
* @return 解密后的字节数组
* @throws Exception 异常
*/
public static String decode(String key,String data) {
if(data == null)
return null;
try {
DESKeySpec dks = new DESKeySpec(key.getBytes());
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
//key的长度不能够小于8位字节
Key secretKey = keyFactory.generateSecret(dks);
Cipher cipher = Cipher.getInstance(ALGORITHM_DES);
IvParameterSpec iv = new IvParameterSpec("12345678".getBytes());
AlgorithmParameterSpec paramSpec = iv;
cipher.init(Cipher.DECRYPT_MODE, secretKey, paramSpec);
return new String(cipher.doFinal(hex2byte(data.getBytes())));
} catch (Exception e){
e.printStackTrace();
return data;
}
}

/**
* 二行制转字符串
* @param b
* @return
*/
private static String byte2hex(byte[] b) {
StringBuilder hs = new StringBuilder();
String stmp;
for (int n = 0; b!=null && n < b.length; n++) {
stmp = Integer.toHexString(b[n] & 0XFF);
if (stmp.length() == 1)
hs.append('0');
hs.append(stmp);
}
return hs.toString().toUpperCase();
}

private static byte[] hex2byte(byte[] b) {
if((b.length%2)!=0)
throw new IllegalArgumentException();
byte[] b2 = new byte[b.length/2];
for (int n = 0; n < b.length; n+=2) {
String item = new String(b,n,2);
b2[n/2] = (byte)Integer.parseInt(item,16);
}
return b2;
}

}

转载请注明:Z/RANDY » 加密解密工具类(Java,DES)

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