3DES双倍长加密
Posted bchange
tags:
篇首语：本文由小常识网(cha138.com)小编为大家整理，主要介绍了3DES双倍长加密相关的知识，希望对你有一定的参考价值。
结果与DES算法工具一致
import java.security.SecureRandom;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
public class ceshi2 {
public static void main(String[] args) {
String key = "F2C04AD9F598EE61C424C9C7D39BA75F";
String data = "06321643FF8B67EB";
String des = encryptECB3Des(key,data);
System.out.println(des);
}
public static String encryptECB3Des(String key, String src) {
System.out.println("encryptECB3Des->" + "key:" + key);
System.out.println("encryptECB3Des->" + "src:" + src);
int len = key.length();
if (key == null || src == null) {
return null;
}
if (src.length() % 16 != 0) {
return null;
}
if (len == 32) {
String outData = "";
String str = "";
for (int i = 0; i < src.length() / 16; i++) {
str = src.substring(i * 16, (i + 1) * 16);
outData += encECB3Des(key, str);
}
return outData;
}
return null;
}
public static String encECB3Des(String key, String src) {
byte[] temp = null;
byte[] temp1 = null;
temp1 = encryptDes(hexStringToBytes(key.substring(0, 16)), hexStringToBytes(src));
temp = decryptDes(hexStringToBytes(key.substring(16, 32)), temp1);
temp1 = encryptDes(hexStringToBytes(key.substring(0, 16)), temp);
return bytesToHexString(temp1);
}
public static String decECB3Des(String key, String src) {
byte[] temp2 = decryptDes(hexStringToBytes(key.substring(0, 16)), hexStringToBytes(src));
byte[] temp1 = encryptDes(hexStringToBytes(key.substring(16, 32)), temp2);
byte[] dest = decryptDes(hexStringToBytes(key.substring(0, 16)), temp1);
return bytesToHexString(dest);
}
public static String bytesToHexString(byte[] src) {
StringBuilder stringBuilder = new StringBuilder("");
if (src == null || src.length <= 0) {
return null;
}
for (int i = 0; i < src.length; i++) {
int v = src[i] & 0xFF;
String hv = Integer.toHexString(v);
if (hv.length() < 2) {
stringBuilder.append(0);
}
stringBuilder.append(hv);
}
return stringBuilder.toString();
}
public static byte[] hexStringToBytes(String hexString) {
if (hexString == null || hexString.equals("")) {
return null;
}
hexString = hexString.toUpperCase();
int length = hexString.length() / 2;
char[] hexChars = hexString.toCharArray();
byte[] d = new byte[length];
for (int i = 0; i < length; i++) {
int pos = i * 2;
d[i] = (byte) (charToByte(hexChars[pos]) << 4 | charToByte(hexChars[pos + 1]));
}
return d;
}
private static byte charToByte(char c) {
return (byte) "0123456789ABCDEF".indexOf(c);
}
/**
* 3DES(双倍长) 解密
*
* @param keybyte
* @param src
* @return
*/
public static String decryptECB3Des(String key, String src) {
if (key == null || src == null) {
return null;
}
if (src.length() % 16 != 0) {
return null;
}
if (key.length() == 32) {
String outData = "";
String str = "";
for (int i = 0; i < src.length() / 16; i++) {
str = src.substring(i * 16, (i + 1) * 16);
outData += decECB3Des(key, str);
}
return outData;
}
return null;
}
/**
* DES加密
*
*/
public static byte[] encryptDes(byte[] key, byte[] src) {
try {
// 创建一个DESKeySpec对象
DESKeySpec desKey = new DESKeySpec(key);
// 创建一个密匙工厂
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
// 将DESKeySpec对象转换成SecretKey对象
SecretKey secretKey = keyFactory.generateSecret(desKey);
// Cipher对象实际完成解密操作
Cipher cipher = Cipher.getInstance("DES/ECB/NoPadding");
// 用密匙初始化Cipher对象
cipher.init(Cipher.ENCRYPT_MODE, secretKey);
// 现在，获取数据并加密
// 正式执行加密操作
return cipher.doFinal(src);
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
/**
* des解密
*
* @param key
* @param src
* @return
*/
public static byte[] decryptDes(byte[] key, byte[] src) {
try {
// DES算法要求有一个可信任的随机数源
SecureRandom random = new SecureRandom();
// 创建一个DESKeySpec对象
DESKeySpec desKey = new DESKeySpec(key);
// 创建一个密匙工厂
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
// 将DESKeySpec对象转换成SecretKey对象
SecretKey secretKey = keyFactory.generateSecret(desKey);
// Cipher对象实际完成解密操作
Cipher cipher = Cipher.getInstance("DES/ECB/NoPadding");
// 用密匙初始化Cipher对象
cipher.init(Cipher.DECRYPT_MODE, secretKey, random);
// 现在，获取数据并加密
// 正式执行加密操作
return cipher.doFinal(src);
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
}
以上是关于3DES双倍长加密的主要内容，如果未能解决你的问题，请参考以下文章