DotNet中用到的加密算法總結

2024-07-21 02:28:15

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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        }