最近一个项目中，因为服务端是用的java开发的，客户端是用的C#，由于通信部分采用到了3DES加密，所以做个记录，以备以后需要的时候直接用。
这是对方（java）的加密算法，和网上流传的代码也差不多（主密钥直接写死了，方便测试）
package org.zwork.market.mina.msg; import java.security.spec.KeySpec; import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import javax.crypto.spec.DESedeKeySpec; import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.zwork.market.MktContants; public class ThreeEncryptDecrypt { private static final Logger LOGGER = LoggerFactory.getLogger(ThreeEncryptDecrypt.class); // 定义 加密算法,可用 DES,DESede,Blowfish
public static final String Algorithm = "DESede";
public static String DES = "DES/ECB/NoPadding";
public static String TriDes = "DESede/ECB/NoPadding"; // des加密
public static byte[] des_crypt(byte key[], byte data[]) {
try {
KeySpec ks = new DESKeySpec(key);
SecretKeyFactory kf = SecretKeyFactory.getInstance("DES");
SecretKey ky = kf.generateSecret(ks); Cipher c = Cipher.getInstance(DES);
c.init(Cipher.ENCRYPT_MODE, ky);
return c.doFinal(data);
} catch (Exception e) {
LOGGER.error("des_crypt error:", e);
return null;
}
} // des解密
public static byte[] des_decrypt(byte key[], byte data[]) { try {
KeySpec ks = new DESKeySpec(key);
SecretKeyFactory kf = SecretKeyFactory.getInstance("DES");
SecretKey ky = kf.generateSecret(ks); Cipher c = Cipher.getInstance(DES);
c.init(Cipher.DECRYPT_MODE, ky);
return c.doFinal(data);
} catch (Exception e) {
LOGGER.error("des_decrypt error:", e);
return null;
}
} // 3DES加密
public static byte[] trides_crypt(byte key[], byte data[]) {
try {
byte[] k = new byte[]; int len = data.length;
if (data.length % != ) {
len = data.length - data.length % + ;
}
byte[] needData = null;
if (len != )
needData = new byte[len]; for (int i = ; i < len; i++) {
needData[i] = 0x00;
} System.arraycopy(data, , needData, , data.length); if (key.length == ) {
System.arraycopy(key, , k, , key.length);
System.arraycopy(key, , k, , );
} else {
System.arraycopy(key, , k, , );
} KeySpec ks = new DESedeKeySpec(k);
SecretKeyFactory kf = SecretKeyFactory.getInstance("DESede");
SecretKey ky = kf.generateSecret(ks); Cipher c = Cipher.getInstance(TriDes);
c.init(Cipher.ENCRYPT_MODE, ky);
return c.doFinal(needData);
} catch (Exception e) {
LOGGER.error("trides_crypt error:", e);
return null;
} } // 3DES解密
public static byte[] trides_decrypt(byte key[], byte data[]) {
try {
byte[] k = new byte[]; int len = data.length;
if (data.length % != ) {
len = data.length - data.length % + ;
}
byte[] needData = null;
if (len != )
needData = new byte[len]; for (int i = ; i < len; i++) {
needData[i] = 0x00;
} System.arraycopy(data, , needData, , data.length); if (key.length == ) {
System.arraycopy(key, , k, , key.length);
System.arraycopy(key, , k, , );
} else {
System.arraycopy(key, , k, , );
}
KeySpec ks = new DESedeKeySpec(k);
SecretKeyFactory kf = SecretKeyFactory.getInstance("DESede");
SecretKey ky = kf.generateSecret(ks); Cipher c = Cipher.getInstance(TriDes);
c.init(Cipher.DECRYPT_MODE, ky);
return c.doFinal(needData);
} catch (Exception e) {
LOGGER.error("trides_decrypt error:", e);
return null;
}
} public static String getPass(String source) {
byte[] data= hexToBytes(source);
byte[] key ="111111111111111111111111111a1.1.".getBytes();
String result = byte2hex(trides_decrypt(key, data)).toUpperCase();
return result.substring(, );
} public static String byte2hex(byte[] data) {
StringBuffer sb = new StringBuffer();
for (int i = ; i < data.length; i++) {
String temp = Integer.toHexString(((int) data[i]) & 0xFF);
for (int t = temp.length(); t < ; t++) {
sb.append("");
}
sb.append(temp);
}
return sb.toString();
} public static byte[] hexToBytes(String str) {
if (str == null) {
return null;
} else if (str.length() < ) {
return null;
} else {
int len = str.length() / ;
byte[] buffer = new byte[len];
for (int i = ; i < len; i++) {
buffer[i] = (byte) Integer.parseInt(str.substring(i * , i * + ), );
}
return buffer;
}
}
}
因为客户端只负责数据加密，所以我这里只写了加密的部分。由于java和C#语言很相似，所以我就仿这他们给的java代码改成C#的，当然也在网上参考了一些代码，不过中间还是出现了些问题，比如C#不支持弱密钥（把密钥弄复杂点）,因为没注意大小写造成加密结果不一致等等。编程这东西一个点都能让整个系统崩溃，所以小细节很重要！！！
public class DESHelper
{
/// <summary>
/// 将密码转成直接数组
/// </summary>
/// <param name="str"></param>
/// <returns></returns>
public static byte[] HexToBytes(String str)
{
if (str == null)
{
return null;
}
else if (str.Length < )
{
return null;
}
else
{
int len = str.Length / ;
byte[] buffer = new byte[len];
for (int i = ; i < len; i++)
{
var temp = str.Substring(i * , );
buffer[i] = (byte)Convert.ToInt32(temp, );
}
return buffer;
}
}
/// <summary>
/// 3DES加密
/// </summary>
/// <param name="key"></param>
/// <param name="data"></param>
/// <returns></returns>
public static byte[] GetDes3EncryptedText(byte[] key, byte[] data)
{
byte[] k = new byte[];
int len = data.Length;
if (data.Length % != )
{
len = data.Length - data.Length % + ;
}
byte[] needData = null;
if (len != )
needData = new byte[len]; for (int i = ; i < len; i++)
{
needData[i] = 0x00;
} Buffer.BlockCopy(data, , needData, , data.Length); if (key.Length == )
{
Buffer.BlockCopy(key, , k, , key.Length);
Buffer.BlockCopy(key, , k, , );
}
else
{
Buffer.BlockCopy(key, , k, , );
} var des3 = new TripleDESCryptoServiceProvider();
des3.Key = k;
des3.Mode = CipherMode.ECB;
des3.Padding = PaddingMode.Zeros; using (MemoryStream ms = new MemoryStream())
using (CryptoStream cs = new CryptoStream(ms, des3.CreateEncryptor(), CryptoStreamMode.Write))
{
cs.Write(data, , data.Length);
cs.FlushFinalBlock();
return ms.ToArray();
}
} /// <summary>
/// 将加密结果转成字符串
/// </summary>
/// <param name="data"></param>
/// <returns></returns>
public static String GetByte2Hex(byte[] data)
{
StringBuilder sb = new StringBuilder();
for (int i = ; i < data.Length; i++)
{
String temp = string.Format("{0:X}", ((int)data[i]) & 0xFF);
for (int t = temp.Length; t < ; t++)
{
sb.Append("");
}
sb.Append(temp);
}
return sb.ToString();
}
}