1public class CryptUtil
2 {
3 public static string DecryptString(string input)
4 {
5 if (input.Equals(string.Empty))
6 {
7 return input;
8 }
9
10 byte[] byKey = {0x63, 0x68, 0x65, 0x6E, 0x79, 0x75, 0x61, 0x6E};
11 byte[] IV = {0xFE, 0xDC, 0xBA, 0x98, 0x76, 0x54, 0x32, 0x10};
12 byte[] inputByteArray = new Byte[input.Length];
13 DESCryptoServiceProvider des = new DESCryptoServiceProvider();
14 inputByteArray = Convert.FromBase64String(input);
15 MemoryStream ms = new MemoryStream();
16 CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(byKey, IV), CryptoStreamMode.Write);
17 cs.Write(inputByteArray, 0, inputByteArray.Length);
18 cs.FlushFinalBlock();
19 Encoding encoding = new UTF8Encoding();
20 return encoding.GetString(ms.ToArray());
21 }
22
23 public static string EncryptString(string input)
24 {
25 if (input.Equals(string.Empty))
26 {
27 return input;
28 }
29
30 byte[] byKey = {0x63, 0x68, 0x65, 0x6E, 0x79, 0x75, 0x61, 0x6E};
31 byte[] IV = {0xFE, 0xDC, 0xBA, 0x98, 0x76, 0x54, 0x32, 0x10};
32 DESCryptoServiceProvider des = new DESCryptoServiceProvider();
33 byte[] inputByteArray = Encoding.UTF8.GetBytes(input);
34 MemoryStream ms = new MemoryStream();
35 CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(byKey, IV), CryptoStreamMode.Write);
36 cs.Write(inputByteArray, 0, inputByteArray.Length);
37 cs.FlushFinalBlock();
38 return Convert.ToBase64String(ms.ToArray());
39 }
40 /**//// <summary>
41 /// DES + Base64 加密
42 /// </summary>
43 /// <param name="input">明文字符串</param>
44 /// <returns>已加密字符串</returns>
45 public static string DesBase64Encrypt(string input)
46 {
47 System.Security.Cryptography.DES des = System.Security.Cryptography.DES.Create();
48 des.Mode = System.Security.Cryptography.CipherMode.ECB;
49 ICryptoTransform ct;
50 MemoryStream ms;
51 CryptoStream cs;
52 byte[] byt;
53 byte[] Key = new byte[8]{56,50,55,56,56,55,49,49};
54 byte[] IV = new byte[8]{0,0,0,0,0,0,0,0};
55
56 ct = des.CreateEncryptor(Key, IV);
57
58 byt = Encoding.GetEncoding("GB2312").GetBytes(input); //根據 GB2312 編碼對字符串處理，轉換成 byte 數組
59
60 ms = new MemoryStream();
61 cs = new CryptoStream(ms, ct, CryptoStreamMode.Write);
62 cs.Write(byt, 0, byt.Length);
63 cs.FlushFinalBlock();
64
65 cs.Close();
66
67 byte[] answer = ms.ToArray();
68 for(int j=0;j<answer.Length;j++)
69 {
70 Console.Write(answer[j].ToString()+ " ");
71 }
72 Console.WriteLine();
73 return Convert.ToBase64String(ms.ToArray()); // 將加密的 byte 數組依照 Base64 編碼轉換成字符串
74 }
75
76 /**//// <summary>
77 /// DES + Base64 解密
78 /// </summary>
79 /// <param name="input">密文字符串</param>
80 /// <returns>解密字符串</returns>
81 public static string DesBase64Decrypt(string input)
82 {
83 System.Security.Cryptography.DES des = System.Security.Cryptography.DES.Create();
84 des.Mode = System.Security.Cryptography.CipherMode.ECB;
85 ICryptoTransform ct;
86 MemoryStream ms;
87 CryptoStream cs;
88 byte[] byt;
89 byte[] Key = new byte[8]{56,50,55,56,56,55,49,49};
90 byte[] IV = new byte[8]{0,0,0,0,0,0,0,0};
91
92 ct = des.CreateDecryptor(Key, IV);
93 byt = Convert.FromBase64String(input); // 將 密文 以 Base64 編碼轉換成 byte 數組
94
95 ms = new MemoryStream();
96 cs = new CryptoStream(ms, ct, CryptoStreamMode.Write);
97 cs.Write(byt, 0, byt.Length);
98 cs.FlushFinalBlock();
99
100 cs.Close();
101
102 return Encoding.GetEncoding("GB2312").GetString(ms.ToArray()); // 將 明文 以 GB2312 編碼轉換成字符串
103 }
104
105
106
107 /**//// <summary>
108 /// DES + Base64 加密
109 /// </summary>
110 /// <param name="input">明文字符串</param>
111 /// <returns>已加密字符串</returns>
112 public static string DesBase64EncryptForID5(string input)
113 {
114 System.Security.Cryptography.DES des = System.Security.Cryptography.DES.Create();
115 des.Mode = System.Security.Cryptography.CipherMode.CBC;
116 ICryptoTransform ct;
117 MemoryStream ms;
118 CryptoStream cs;
119 byte[] byt;
120 byte[] Key = new byte[8]{56,50,55,56,56,55,49,49};
121 byte[] IV = new byte[8]{56,50,55,56,56,55,49,49};
122
123 ct = des.CreateEncryptor(Key, IV);
124
125 byt = Encoding.GetEncoding("GB2312").GetBytes(input); //根據 GB2312 編碼對字符串處理，轉換成 byte 數組
126
127 ms = new MemoryStream();
128 cs = new CryptoStream(ms, ct, CryptoStreamMode.Write);
129 cs.Write(byt, 0, byt.Length);
130 cs.FlushFinalBlock();
131
132 cs.Close();
133
134 byte[] answer = ms.ToArray();
135 for(int j=0;j<answer.Length;j++)
136 {
137 Console.Write(answer[j].ToString()+ " ");
138 }
139 Console.WriteLine();
140 return Convert.ToBase64String(ms.ToArray()); // 將加密的 byte 數組依照 Base64 編碼轉換成字符串
141 }
142
143
144 /**//// <summary>
145 /// DES + Base64 解密
146 /// </summary>
147 /// <param name="input">密文字符串</param>
148 /// <returns>解密字符串</returns>
149 public static string DesBase64DecryptForID5(string input)
150 {
151 System.Security.Cryptography.DES des = System.Security.Cryptography.DES.Create();
152 des.Mode = System.Security.Cryptography.CipherMode.CBC;
153 ICryptoTransform ct;
154 MemoryStream ms;
155 CryptoStream cs;
156 byte[] byt;
157 byte[] Key = new byte[8]{56,50,55,56,56,55,49,49};
158 byte[] IV = new byte[8]{56,50,55,56,56,55,49,49};
159
160 ct = des.CreateDecryptor(Key, IV);
161 byt = Convert.FromBase64String(input); // 將 密文 以 Base64 編碼轉換成 byte 數組
162
163 ms = new MemoryStream();
164 cs = new CryptoStream(ms, ct, CryptoStreamMode.Write);
165 cs.Write(byt, 0, byt.Length);
166 cs.FlushFinalBlock();
167
168 cs.Close();
169
170 return Encoding.GetEncoding("GB2312").GetString(ms.ToArray()); // 將 明文 以 GB2312 編碼轉換成字符串
171 }
172
173
174 /**//// <summary>
175 /// 3DES 加密 Byte[] to HEX string
176 /// </summary>
177 /// <param name="input">明文字符串</param>
178 /// <returns>已加密字符串</returns>
179 public static string ThreeDesEncryptHEX(string input)
180 {
181 string result = "";
182 System.Security.Cryptography.TripleDES des = System.Security.Cryptography.TripleDES.Create();
183 des.Mode = System.Security.Cryptography.CipherMode.CBC;
184 des.Padding = System.Security.Cryptography.PaddingMode.PKCS7;
185 ICryptoTransform ct;
186 MemoryStream ms;
187 CryptoStream cs;
188 byte[] byt;
189 byte[] Key = new byte[24]{
190 1,2,3,4,5,6,
191 1,2,3,4,5,6,
192 1,2,3,4,5,6,
193 1,2,3,4,5,6
194 };
195 byte[] IV = new byte[8]{1,2,3,4,5,6,1,2};
196
197 ct = des.CreateEncryptor(Key, IV);
198
199 byt = Encoding.GetEncoding("GB2312").GetBytes(input); //根據 GB2312 編碼對字符串處理，轉換成 byte 數組
200
201 ms = new MemoryStream();
202 cs = new CryptoStream(ms, ct, CryptoStreamMode.Write);
203 cs.Write(byt, 0, byt.Length);
204 cs.FlushFinalBlock();
205
206 cs.Close();
207
208 byte[] answer = ms.ToArray();
209 for(int j=0;j<answer.Length;j++)
210 {
211 result += answer[j].ToString("x").PadLeft(2,'0');
212 }
213 return result;
214 }
215
216 /**//// <summary>
217 /// 3DES + HEX to byte[] 解密
218 /// </summary>
219 /// <param name="input">密文字符串</param>
220 /// <returns>解密字符串</returns>
221 public static string ThreeDesDecryptHEX(string input)
222 {
223 System.Security.Cryptography.TripleDES des = System.Security.Cryptography.TripleDES.Create();
224 des.Mode = System.Security.Cryptography.CipherMode.CBC;
225 des.Padding = System.Security.Cryptography.PaddingMode.PKCS7;
226 ICryptoTransform ct;
227 MemoryStream ms;
228 CryptoStream cs;
229 byte[] Key = new byte[24]{
230 1,2,3,4,5,6,
231 1,2,3,4,5,6,
232 1,2,3,4,5,6,
233 1,2,3,4,5,6
234 };
235 byte[] IV = new byte[8]{1,2,3,4,5,6,1,2};
236
237 ct = des.CreateDecryptor(Key, IV);
238 //byt = Convert.FromBase64String(input); // 將 密文 以 HEX to byte[]編碼轉換成 byte 數組
239 if(input.Length<=1)
240 {
241 throw new Exception("encrypted HEX string is too short!");
242 }
243 byte[] byt = new byte[input.Length/2];
244 for(int i=0;i<byt.Length;i++)
245 {
246 //Console.WriteLine(input.Substring(i*2,2));
247 byt[i] = Convert.ToByte(input.Substring(i*2,2),16);
248 }
249
250 ms = new MemoryStream();
251 cs = new CryptoStream(ms, ct, CryptoStreamMode.Write);
252 cs.Write(byt, 0, byt.Length);
253 cs.FlushFinalBlock();
254
255 cs.Close();
256
257 return Encoding.GetEncoding("GB2312").GetString(ms.ToArray()); // 將 明文 以 GB2312 編碼轉換成字符串
258 }
259 /**//// <summary>
260 /// Base64解碼
261 /// </summary>
262 /// <param name="base64Str"></param>
263 /// <returns></returns>
264 public static string DecodingFromBase64(string base64Str)
265 {
266 Byte[] bytes = Convert.FromBase64String(base64Str);
267 return System.Text.Encoding.UTF8.GetString(bytes);
268 }
269 /**//// <summary>
270 /// Base64編碼
271 /// </summary>
272 /// <param name="str"></param>
273 /// <returns></returns>
274 public static string EncodingToBase64(string str)
275 {
276 return Convert.ToBase64String(Encoding.UTF8.GetBytes(str));
277 }
278 /**//// <summary>
279 /// 根據指定的編碼方式Base64解碼
280 /// </summary>
281 /// <param name="base64Str"></param>
282 /// <param name="strEncoding"></param>
283 /// <returns></returns>
284 public static string DecodingFromBase64(string base64Str,System.Text.Encoding strEncoding)
285 {
286 Byte[] bytes = Convert.FromBase64String(base64Str);
287 return strEncoding.GetString(bytes);
288 }
289 /**//// <summary>
290 /// 根據指定的編碼方式Base64編碼
291 /// </summary>
292 /// <param name="str"></param>
293 /// <param name="strEncoding"></param>
294 /// <returns></returns>
295 public static string EncodingToBase64(string str,System.Text.Encoding strEncoding)
296 {
297 return Convert.ToBase64String(strEncoding.GetBytes(str));
298 }
299 }
兩個常用的方法
1 /**//// <summary>
2 /// 通過字節數組形式的密鑰獲取字符串形式的密鑰
3 /// </summary>
4 void GetStringByByteArray()
5 {
6 byte[] Key = new byte[8]{56,50,55,56,56,55,49,49};
7 Response.Write(System.Text.Encoding.Default.GetString(Key));
8 Response.End();
9 }
10
11 /**//// <summary>
12 /// 通過字符串形式的密鑰獲取字節數組形式的密鑰
13 /// </summary>
14 void GetByteArrayByString()
15 {
16 string key = "82788711";
17 Response.Write(System.Text.Encoding.Default.GetBytes(key));
18 Response.End();
19
20 }
