DotNet中用到的加密算法总结

  1 public   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); //根据 GB2312 编码对字符串处理，转换成 byte 数组
 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()); // 将加密的 byte 数组依照 Base64 编码转换成字符串
 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); // 将 密文 以 Base64 编码转换成 byte 数组
 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()); // 将 明文 以 GB2312 编码转换成字符串
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); //根据 GB2312 编码对字符串处理，转换成 byte 数组
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()); // 将加密的 byte 数组依照 Base64 编码转换成字符串
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); // 将 密文 以 Base64 编码转换成 byte 数组
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()); // 将 明文 以 GB2312 编码转换成字符串
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); //根据 GB2312 编码对字符串处理，转换成 byte 数组
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); // 将 密文 以 HEX to byte[]编码转换成 byte 数组
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()); // 将 明文 以 GB2312 编码转换成字符串
258        }
259        /**//// <summary>
260        /// Base64解码
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编码
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        /// 根据指定的编码方式Base64解码
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        /// 根据指定的编码方式Base64编码
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    }

两个常用的方法

 1      /**/ /// <summary>
 2        /// 通过字节数组形式的密钥获取字符串形式的密钥
 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        /// 通过字符串形式的密钥获取字节数组形式的密钥
13        /// </summary>
14          void  GetByteArrayByString()
15          {
16            string key = "82788711";
17            Response.Write(System.Text.Encoding.Default.GetBytes(key));
18            Response.End();
19            
20        }