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）
1 package org.zwork.market.mina.msg; 2 3 import java.security.spec.KeySpec; 4 5 import javax.crypto.Cipher; 6 import javax.crypto.SecretKey; 7 import javax.crypto.SecretKeyFactory; 8 import javax.crypto.spec.DESKeySpec; 9 import javax.crypto.spec.DESedeKeySpec; 10 11 import org.slf4j.Logger; 12 import org.slf4j.LoggerFactory; 13 import org.zwork.market.MktContants; 14 15 public class ThreeEncryptDecrypt { 16 17 private static final Logger LOGGER = LoggerFactory.getLogger(ThreeEncryptDecrypt.class); 18 19 // 定义 加密算法,可用 DES,DESede,Blowfish 20 public static final String Algorithm = "DESede"; 21 public static String DES = "DES/ECB/NoPadding"; 22 public static String TriDes = "DESede/ECB/NoPadding"; 23 24 // des加密 25 public static byte[] des_crypt(byte key[], byte data[]) { 26 try { 27 KeySpec ks = new DESKeySpec(key); 28 SecretKeyFactory kf = SecretKeyFactory.getInstance("DES"); 29 SecretKey ky = kf.generateSecret(ks); 30 31 Cipher c = Cipher.getInstance(DES); 32 c.init(Cipher.ENCRYPT_MODE, ky); 33 return c.doFinal(data); 34 } catch (Exception e) { 35 LOGGER.error("des_crypt error:", e); 36 return null; 37 } 38 } 39 40 // des解密 41 public static byte[] des_decrypt(byte key[], byte data[]) { 42 43 try { 44 KeySpec ks = new DESKeySpec(key); 45 SecretKeyFactory kf = SecretKeyFactory.getInstance("DES"); 46 SecretKey ky = kf.generateSecret(ks); 47 48 Cipher c = Cipher.getInstance(DES); 49 c.init(Cipher.DECRYPT_MODE, ky); 50 return c.doFinal(data); 51 } catch (Exception e) { 52 LOGGER.error("des_decrypt error:", e); 53 return null; 54 } 55 } 56 57 // 3DES加密 58 public static byte[] trides_crypt(byte key[], byte data[]) { 59 try { 60 byte[] k = new byte[24]; 61 62 int len = data.length; 63 if (data.length % 8 != 0) { 64 len = data.length - data.length % 8 + 8; 65 } 66 byte[] needData = null; 67 if (len != 0) 68 needData = new byte[len]; 69 70 for (int i = 0; i < len; i++) { 71 needData[i] = 0x00; 72 } 73 74 System.arraycopy(data, 0, needData, 0, data.length); 75 76 if (key.length == 16) { 77 System.arraycopy(key, 0, k, 0, key.length); 78 System.arraycopy(key, 0, k, 16, 8); 79 } else { 80 System.arraycopy(key, 0, k, 0, 24); 81 } 82 83 KeySpec ks = new DESedeKeySpec(k); 84 SecretKeyFactory kf = SecretKeyFactory.getInstance("DESede"); 85 SecretKey ky = kf.generateSecret(ks); 86 87 Cipher c = Cipher.getInstance(TriDes); 88 c.init(Cipher.ENCRYPT_MODE, ky); 89 return c.doFinal(needData); 90 } catch (Exception e) { 91 LOGGER.error("trides_crypt error:", e); 92 return null; 93 } 94 95 } 96 97 // 3DES解密 98 public static byte[] trides_decrypt(byte key[], byte data[]) { 99 try {100 byte[] k = new byte[24];101 102 int len = data.length;103 if (data.length % 8 != 0) {104 len = data.length - data.length % 8 + 8;105 }106 byte[] needData = null;107 if (len != 0)108 needData = new byte[len];109 110 for (int i = 0; i < len; i++) {111 needData[i] = 0x00;112 }113 114 System.arraycopy(data, 0, needData, 0, data.length);115 116 if (key.length == 16) {117 System.arraycopy(key, 0, k, 0, key.length);118 System.arraycopy(key, 0, k, 16, 8);119 } else {120 System.arraycopy(key, 0, k, 0, 24);121 }122 KeySpec ks = new DESedeKeySpec(k);123 SecretKeyFactory kf = SecretKeyFactory.getInstance("DESede");124 SecretKey ky = kf.generateSecret(ks);125 126 Cipher c = Cipher.getInstance(TriDes);127 c.init(Cipher.DECRYPT_MODE, ky);128 return c.doFinal(needData);129 } catch (Exception e) {130 LOGGER.error("trides_decrypt error:", e);131 return null;132 }133 }134 135 public static String getPass(String source) {136 byte[] data= hexToBytes(source);137 byte[] key ="111111111111111111111111111a1.1.".getBytes();138 String result = byte2hex(trides_decrypt(key, data)).toUpperCase();139 return result.substring(2, 8);140 }141 142 public static String byte2hex(byte[] data) {143 StringBuffer sb = new StringBuffer();144 for (int i = 0; i < data.length; i++) {145 String temp = Integer.toHexString(((int) data[i]) & 0xFF);146 for (int t = temp.length(); t < 2; t++) {147 sb.append("0");148 }149 sb.append(temp);150 }151 return sb.toString();152 }153 154 public static byte[] hexToBytes(String str) {155 if (str == null) {156 return null;157 } else if (str.length() < 2) {158 return null;159 } else {160 int len = str.length() / 2;161 byte[] buffer = new byte[len];162 for (int i = 0; i < len; i++) {163 buffer[i] = (byte) Integer.parseInt(str.substring(i * 2, i * 2 + 2), 16);164 }165 return buffer;166 }167 }168 }
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！！！
1 public class DESHelper 2 { 3 /// <summary> 4 /// 将密码转成直接数组 5 /// </summary> 6 /// <param name="str"></param> 7 /// <returns></returns> 8 public static byte[] HexToBytes(String str) 9 {10 if (str == null)11 {12 return null;13 }14 else if (str.Length < 2)15 {16 return null;17 }18 else19 {20 int len = str.Length / 2;21 byte[] buffer = new byte[len];22 for (int i = 0; i < len; i++)23 {24 var temp = str.Substring(i * 2, 2);25 buffer[i] = (byte)Convert.ToInt32(temp, 16);26 }27 return buffer;28 }29 }30 /// <summary>31 /// 3DES加密32 /// </summary>33 /// <param name="key"></param>34 /// <param name="data"></param>35 /// <returns></returns>36 public static byte[] GetDes3EncryptedText(byte[] key, byte[] data)37 {38 byte[] k = new byte[24];39 int len = data.Length;40 if (data.Length % 8 != 0)41 {42 len = data.Length - data.Length % 8 + 8;43 }44 byte[] needData = null;45 if (len != 0)46 needData = new byte[len];47 48 for (int i = 0; i < len; i++)49 {50 needData[i] = 0x00;51 }52 53 Buffer.BlockCopy(data, 0, needData, 0, data.Length);54 55 if (key.Length == 16)56 {57 Buffer.BlockCopy(key, 0, k, 0, key.Length);58 Buffer.BlockCopy(key, 0, k, 16, 8);59 }60 else61 {62 Buffer.BlockCopy(key, 0, k, 0, 24);63 }64 65 var des3 = new TripleDESCryptoServiceProvider();66 des3.Key = k;67 des3.Mode = CipherMode.ECB;68 des3.Padding = PaddingMode.Zeros;69 70 using (MemoryStream ms = new MemoryStream())71 using (CryptoStream cs = new CryptoStream(ms, des3.CreateEncryptor(), CryptoStreamMode.Write))72 {73 cs.Write(data, 0, data.Length);74 cs.FlushFinalBlock();75 return ms.ToArray();76 }77 }78 79 /// <summary>80 /// 将加密结果转成字符串81 /// </summary>82 /// <param name="data"></param>83 /// <returns></returns>84 public static String GetByte2Hex(byte[] data)85 {86 StringBuilder sb = new StringBuilder();87 for (int i = 0; i < data.Length; i++)88 {89 String temp = string.Format("{0:X}", ((int)data[i]) & 0xFF);90 for (int t = temp.Length; t < 2; t++)91 {92 sb.Append("0");93 }94 sb.Append(temp);95 }96 return sb.ToString();97 }98 }