C#中常用的字符串加密、解密方法封装

C#中常用的字符串加密、解密方法封装
  1 //方法一
  2 //须添加对System.Web的引用
  3 //using System.Web.Security;
  4 /// <summary>
  5 /// SHA1加密字符串
  6 /// </summary>
  7 /// <param name="source">源字符串</param>
  8 /// <returns>加密后的字符串</returns>
  9 public string SHA1(string source)
 10 {
 11     return FormsAuthentication.HashPasswordForStoringInConfigFile(source, "SHA1");
 12 }
 13 /// <summary>
 14 /// MD5加密字符串
 15 /// </summary>
 16 /// <param name="source">源字符串</param>
 17 /// <returns>加密后的字符串</returns>
 18 public string MD5(string source)
 19 {
 20     return FormsAuthentication.HashPasswordForStoringInConfigFile(source, "MD5");;
 21 }
 22 
 23 
 24 //方法二(可逆加密解密):
 25 //using System.Security.Cryptography;
 26 public string Encode(string data)
 27 {
 28     byte[] byKey = System.Text.ASCIIEncoding.ASCII.GetBytes(KEY_64);
 29     byte[] byIV = System.Text.ASCIIEncoding.ASCII.GetBytes(IV_64);
 30     DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider();
 31     int i = cryptoProvider.KeySize;
 32     MemoryStream ms = new MemoryStream();
 33     CryptoStream cst = new CryptoStream(ms, cryptoProvider.CreateEncryptor(byKey, byIV), CryptoStreamMode.Write);
 34     StreamWriter sw = new StreamWriter(cst);
 35     sw.Write(data);
 36     sw.Flush();
 37     cst.FlushFinalBlock();
 38     sw.Flush();
 39     return Convert.ToBase64String(ms.GetBuffer(), 0, (int)ms.Length);
 40 }
 41 public string Decode(string data)
 42 {
 43     byte[] byKey = System.Text.ASCIIEncoding.ASCII.GetBytes(KEY_64);
 44     byte[] byIV = System.Text.ASCIIEncoding.ASCII.GetBytes(IV_64);
 45     byte[] byEnc;
 46     try
 47     {
 48         byEnc = Convert.FromBase64String(data);
 49     }
 50     catch
 51     {
 52         return null;
 53     }
 54     DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider();
 55     MemoryStream ms = new MemoryStream(byEnc);
 56     CryptoStream cst = new CryptoStream(ms, cryptoProvider.CreateDecryptor(byKey, byIV), CryptoStreamMode.Read);
 57     StreamReader sr = new StreamReader(cst);
 58 
 59 
 60 //方法三(MD5不可逆):
 61 //using System.Security.Cryptography;
 62 //MD5不可逆加密
 63 //32位加密
 64 public string GetMD5_32(string s, string _input_charset)
 65 {
 66     MD5 md5 = new MD5CryptoServiceProvider();
 67     byte[] t = md5.ComputeHash(Encoding.GetEncoding(_input_charset).GetBytes(s));
 68     StringBuilder sb = new StringBuilder(32);
 69     for (int i = 0; i < t.Length; i++)
 70     {
 71         sb.Append(t[i].ToString("x").PadLeft(2, 0));
 72     }
 73     return sb.ToString();
 74 }
 75 //16位加密
 76 public static string GetMd5_16(string ConvertString)
 77 {
 78     MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();
 79     string t2 = BitConverter.ToString(md5.ComputeHash(UTF8Encoding.Default.GetBytes(ConvertString)), 4, 8);
 80     t2 = t2.Replace("-", "");
 81     return t2;
 82 }
 83 
 84 
 85 //方法四(对称加密):
 86 //using System.IO;
 87 //using System.Security.Cryptography;
 88 private SymmetricAlgorithm mobjCryptoService;
 89 private string Key;
 90 /// <summary>   
 91 /// 对称加密类的构造函数   
 92 /// </summary>   
 93 public SymmetricMethod()
 94 {
 95     mobjCryptoService = new RijndaelManaged();
 96     Key = "Guz(%&hj7x89H$yuBI0456FtmaT5&fvHUFCy76*h%(HilJ$lhj!y6&(*jkP87jH7";
 97 }
 98 /// <summary>   
 99 /// 获得密钥   
100 /// </summary>   
101 /// <returns>密钥</returns>   
102 private byte[] GetLegalKey()
103 {
104     string sTemp = Key;
105     mobjCryptoService.GenerateKey();
106     byte[] bytTemp = mobjCryptoService.Key;
107     int KeyLength = bytTemp.Length;
108     if (sTemp.Length > KeyLength)
109         sTemp = sTemp.Substring(0, KeyLength);
110     else if (sTemp.Length < KeyLength)
111         sTemp = sTemp.PadRight(KeyLength,  );
112     return ASCIIEncoding.ASCII.GetBytes(sTemp);
113 }
114 /// <summary>   
115 /// 获得初始向量IV   
116 /// </summary>   
117 /// <returns>初试向量IV</returns>   
118 private byte[] GetLegalIV()
119 {
120     string sTemp = "E4ghj*Ghg7!rNIfb&95GUY86GfghUb#er57HBh(u%g6HJ($jhWk7&!hg4ui%$hjk";
121     mobjCryptoService.GenerateIV();
122     byte[] bytTemp = mobjCryptoService.IV;
123     int IVLength = bytTemp.Length;
124     if (sTemp.Length > IVLength)
125         sTemp = sTemp.Substring(0, IVLength);
126     else if (sTemp.Length < IVLength)
127         sTemp = sTemp.PadRight(IVLength,  );
128     return ASCIIEncoding.ASCII.GetBytes(sTemp);
129 }
130 /// <summary>   
131 /// 加密方法   
132 /// </summary>   
133 /// <param name="Source">待加密的串</param>   
134 /// <returns>经过加密的串</returns>   
135 public string Encrypto(string Source)
136 {
137     byte[] bytIn = UTF8Encoding.UTF8.GetBytes(Source);
138     MemoryStream ms = new MemoryStream();
139     mobjCryptoService.Key = GetLegalKey();
140     mobjCryptoService.IV = GetLegalIV();
141     ICryptoTransform encrypto = mobjCryptoService.CreateEncryptor();
142     CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Write);
143     cs.Write(bytIn, 0, bytIn.Length);
144     cs.FlushFinalBlock();
145     ms.Close();
146     byte[] bytOut = ms.ToArray();
147     return Convert.ToBase64String(bytOut);
148 }
149 /// <summary>   
150 /// 解密方法   
151 /// </summary>   
152 /// <param name="Source">待解密的串</param>   
153 /// <returns>经过解密的串</returns>   
154 public string Decrypto(string Source)
155 {
156     byte[] bytIn = Convert.FromBase64String(Source);
157     MemoryStream ms = new MemoryStream(bytIn, 0, bytIn.Length);
158     mobjCryptoService.Key = GetLegalKey();
159     mobjCryptoService.IV = GetLegalIV();
160     ICryptoTransform encrypto = mobjCryptoService.CreateDecryptor();
161     CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Read);
162     StreamReader sr = new StreamReader(cs);
163     return sr.ReadToEnd();
164 }
165 
166 //方法五:
167 //using System.IO;
168 //using System.Security.Cryptography;
169 //using System.Text;
170 //默认密钥向量
171 private static byte[] Keys = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
172 /**//**//**//// <summary>
173 /// DES加密字符串 keleyi.com
174 /// </summary>
175 /// <param name="encryptString">待加密的字符串</param>
176 /// <param name="encryptKey">加密密钥,要求为8位</param>
177 /// <returns>加密成功返回加密后的字符串,失败返回源串</returns>
178 public static string EncryptDES(string encryptString, string encryptKey)
179 {
180     try
181     {
182         byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8));
183         byte[] rgbIV = Keys;
184         byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);
185         DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();
186         MemoryStream mStream = new MemoryStream();
187         CryptoStream cStream = new CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
188         cStream.Write(inputByteArray, 0, inputByteArray.Length);
189         cStream.FlushFinalBlock();
190         return Convert.ToBase64String(mStream.ToArray());
191     }
192     catch
193     {
194         return encryptString;
195     }
196 }
197 /**//**//**//// <summary>
198 /// DES解密字符串 keleyi.com
199 /// </summary>
200 /// <param name="decryptString">待解密的字符串</param>
201 /// <param name="decryptKey">解密密钥,要求为8位,和加密密钥相同</param>
202 /// <returns>解密成功返回解密后的字符串,失败返源串</returns>
203 public static string DecryptDES(string decryptString, string decryptKey)
204 {
205     try
206     {
207         byte[] rgbKey = Encoding.UTF8.GetBytes(decryptKey);
208         byte[] rgbIV = Keys;
209         byte[] inputByteArray = Convert.FromBase64String(decryptString);
210         DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider();
211         MemoryStream mStream = new MemoryStream();
212         CryptoStream cStream = new CryptoStream(mStream, DCSP.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
213         cStream.Write(inputByteArray, 0, inputByteArray.Length);
214         cStream.FlushFinalBlock();
215         return Encoding.UTF8.GetString(mStream.ToArray());
216     }
217     catch
218     {
219         return decryptString;
220     }
221 } 
222 
223 
224 //方法六(文件加密):
225 //using System.IO;
226 //using System.Security.Cryptography;
227 //using System.Text;
228 //加密文件
229 private static void EncryptData(String inName, String outName, byte[] desKey, byte[] desIV)
230 {
231     //Create the file streams to handle the input and output files.
232     FileStream fin = new FileStream(inName, FileMode.Open, FileAccess.Read);
233     FileStream fout = new FileStream(outName, FileMode.OpenOrCreate, FileAccess.Write);
234     fout.SetLength(0);
235     //Create variables to help with read and write.
236     byte[] bin = new byte[100]; //This is intermediate storage for the encryption.
237     long rdlen = 0;              //This is the total number of bytes written.
238     long totlen = fin.Length;    //This is the total length of the input file.
239     int len;                     //This is the number of bytes to be written at a time.
240     DES des = new DESCryptoServiceProvider();
241     CryptoStream encStream = new CryptoStream(fout, des.CreateEncryptor(desKey, desIV), CryptoStreamMode.Write);
242     //Read from the input file, then encrypt and write to the output file.
243     while (rdlen < totlen)
244     {
245         len = fin.Read(bin, 0, 100);
246         encStream.Write(bin, 0, len);
247         rdlen = rdlen + len;
248     }
249     encStream.Close();
250     fout.Close();
251     fin.Close();
252 }
253 //解密文件
254 private static void DecryptData(String inName, String outName, byte[] desKey, byte[] desIV)
255 {
256     //Create the file streams to handle the input and output files.
257     FileStream fin = new FileStream(inName, FileMode.Open, FileAccess.Read);
258     FileStream fout = new FileStream(outName, FileMode.OpenOrCreate, FileAccess.Write);
259     fout.SetLength(0);
260     //Create variables to help with read and write.
261     byte[] bin = new byte[100]; //This is intermediate storage for the encryption.
262     long rdlen = 0;              //This is the total number of bytes written.
263     long totlen = fin.Length;    //This is the total length of the input file.
264     int len;                     //This is the number of bytes to be written at a time.
265     DES des = new DESCryptoServiceProvider();
266     CryptoStream encStream = new CryptoStream(fout, des.CreateDecryptor(desKey, desIV), CryptoStreamMode.Write);
267     //Read from the input file, then encrypt and write to the output file.
268     while (rdlen < totlen)
269     {
270         len = fin.Read(bin, 0, 100);
271         encStream.Write(bin, 0, len);
272         rdlen = rdlen + len;
273     }
274     encStream.Close();
275     fout.Close();
276     fin.Close();
277     return sr.ReadToEnd();
278 }
C#中常用的字符串加密、解密方法封装

C#中常用的字符串加密、解密方法封装

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