最近一個項目中，因為服務端是用的java開發的，客戶端是用的C#，由於通信部分采用到了3DES加密，所以做個記錄，以備以後需要的時候直接用。
這是對方（java）的加密算法，和網上流傳的代碼也差不多（主密鑰直接寫死了，方便測試）
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 // 定義 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 }
因為客戶端只負責數據加密，所以我這裡只寫了加密的部分。由於java和C#語言很相似，所以我就仿這他們給的java代碼改成C#的，當然也在網上參考了一些代碼，不過中間還是出現了些問題，比如C#不支持弱密鑰（把密鑰弄復雜點）,因為沒注意大小寫造成加密結果不一致等等。編程這東西一個點都能讓整個系統崩潰，所以小細節很重要！！！
1 public class DESHelper
2 {
3 /// <summary>
4 /// 將密碼轉成直接數組
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 else
19 {
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 else
61 {
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 /// 將加密結果轉成字符串
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 }
