C#加密算法汇总

方法一：
02     //须添加对System.Web的引用 
03     using System.Web.Security; 
04       
05     ... 
06       
07     /// <summary> 
08     /// SHA1加密字符串 
09     /// </summary> 
10     /// <param name="source">源字符串</param> 
11     /// <returns>加密后的字符串</returns> 
12     public string SHA1(string source) 
13     { 
14         return FormsAuthentication.HashPasswordForStoringInConfigFile(source, "SHA1"); 
15     } 
16   
17   
18     /// <summary> 
19     /// MD5加密字符串 
20     /// </summary> 
21     /// <param name="source">源字符串</param> 
22     /// <returns>加密后的字符串</returns> 
23     public string MD5(string source) 
24     { 
25         return FormsAuthentication.HashPasswordForStoringInConfigFile(source, "MD5");; 
26     }
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01 方法二(可逆加密解密)：
02     using System.Security.Cryptography; 
03       
04     ... 
05       
06     public string Encode(string data) 
07     { 
08         byte[] byKey = System.Text.ASCIIEncoding.ASCII.GetBytes(KEY_64); 
09         byte[] byIV = System.Text.ASCIIEncoding.ASCII.GetBytes(IV_64); 
10       
11         DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider(); 
12         int i = cryptoProvider.KeySize; 
13         MemoryStream ms = new MemoryStream(); 
14         CryptoStream cst = new CryptoStream(ms, cryptoProvider.CreateEncryptor(byKey, byIV), CryptoStreamMode.Write); 
15       
16         StreamWriter sw = new StreamWriter(cst); 
17         sw.Write(data); 
18         sw.Flush(); 
19         cst.FlushFinalBlock(); 
20         sw.Flush(); 
21         return Convert.ToBase64String(ms.GetBuffer(), 0, (int)ms.Length); 
22       
23     } 
24       
25     public string Decode(string data) 
26     { 
27         byte[] byKey = System.Text.ASCIIEncoding.ASCII.GetBytes(KEY_64); 
28         byte[] byIV = System.Text.ASCIIEncoding.ASCII.GetBytes(IV_64); 
29       
30         byte[] byEnc; 
31         try 
32         { 
33             byEnc = Convert.FromBase64String(data); 
34         } 
35         catch 
36         { 
37             return null; 
38         } 
39       
40         DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider(); 
41         MemoryStream ms = new MemoryStream(byEnc); 
42         CryptoStream cst = new CryptoStream(ms, cryptoProvider.CreateDecryptor(byKey, byIV), CryptoStreamMode.Read); 
43         StreamReader sr = new StreamReader(cst); 
44         return sr.ReadToEnd(); 
45     }
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01 方法三(MD5不可逆)：
02     using System.Security.Cryptography; 
03       
04     ... 
05       
06     //MD5不可逆加密 
07       
08     //32位加密 
09       
10     public string GetMD5_32(string s, string _input_charset) 
11     { 
12         MD5 md5 = new MD5CryptoServiceProvider(); 
13         byte[] t = md5.ComputeHash(Encoding.GetEncoding(_input_charset).GetBytes(s)); 
14         StringBuilder sb = new StringBuilder(32); 
15         for (int i = 0; i < t.Length; i++) 
16         { 
17             sb.Append(t[i].ToString("x").PadLeft(2, '0')); 
18         } 
19         return sb.ToString(); 
20     } 
21       
22     //16位加密 
23     public static string GetMd5_16(string ConvertString) 
24     { 
25         MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider(); 
26         string t2 = BitConverter.ToString(md5.ComputeHash(UTF8Encoding.Default.GetBytes(ConvertString)), 4, 8); 
27         t2 = t2.Replace("-", ""); 
28         return t2; 
29     }
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01 方法四(对称加密)：
02     using System.IO; 
03     using System.Security.Cryptography; 
04       
05     ... 
06       
07     private SymmetricAlgorithm mobjCryptoService; 
08     private string Key; 
09     /// <summary>    
10     /// 对称加密类的构造函数    
11     /// </summary>    
12     public SymmetricMethod() 
13     { 
14         mobjCryptoService = new RijndaelManaged(); 
15         Key = "Guz(%&hj7x89H$yuBI0456FtmaT5&fvHUFCy76*h%(HilJ$lhj!y6&(*jkP87jH7"; 
16     } 
17     /// <summary>    
18     /// 获得密钥    
19     /// </summary>    
20     /// <returns>密钥</returns>    
21     private byte[] GetLegalKey() 
22     { 
23         string sTemp = Key; 
24         mobjCryptoService.GenerateKey(); 
25         byte[] bytTemp = mobjCryptoService.Key; 
26         int KeyLength = bytTemp.Length; 
27         if (sTemp.Length > KeyLength) 
28             sTemp = sTemp.Substring(0, KeyLength); 
29         else if (sTemp.Length < KeyLength) 
30             sTemp = sTemp.PadRight(KeyLength, ' '); 
31         return ASCIIEncoding.ASCII.GetBytes(sTemp); 
32     } 
33     /// <summary>    
34     /// 获得初始向量IV    
35     /// </summary>    
36     /// <returns>初试向量IV</returns>    
37     private byte[] GetLegalIV() 
38     { 
39         string sTemp = "E4ghj*Ghg7!rNIfb&95GUY86GfghUb#er57HBh(u%g6HJ($jhWk7&!hg4ui%$hjk"; 
40         mobjCryptoService.GenerateIV(); 
41         byte[] bytTemp = mobjCryptoService.IV; 
42         int IVLength = bytTemp.Length; 
43         if (sTemp.Length > IVLength) 
44             sTemp = sTemp.Substring(0, IVLength); 
45         else if (sTemp.Length < IVLength) 
46             sTemp = sTemp.PadRight(IVLength, ' '); 
47         return ASCIIEncoding.ASCII.GetBytes(sTemp); 
48     } 
49     /// <summary>    
50     /// 加密方法    
51     /// </summary>    
52     /// <param name="Source">待加密的串</param>    
53     /// <returns>经过加密的串</returns>    
54     public string Encrypto(string Source) 
55     { 
56         byte[] bytIn = UTF8Encoding.UTF8.GetBytes(Source); 
57         MemoryStream ms = new MemoryStream(); 
58         mobjCryptoService.Key = GetLegalKey(); 
59         mobjCryptoService.IV = GetLegalIV(); 
60         ICryptoTransform encrypto = mobjCryptoService.CreateEncryptor(); 
61         CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Write); 
62         cs.Write(bytIn, 0, bytIn.Length); 
63         cs.FlushFinalBlock(); 
64         ms.Close(); 
65         byte[] bytOut = ms.ToArray(); 
66         return Convert.ToBase64String(bytOut); 
67     } 
68     /// <summary>    
69     /// 解密方法    
70     /// </summary>    
71     /// <param name="Source">待解密的串</param>    
72     /// <returns>经过解密的串</returns>    
73     public string Decrypto(string Source) 
74     { 
75         byte[] bytIn = Convert.FromBase64String(Source); 
76         MemoryStream ms = new MemoryStream(bytIn, 0, bytIn.Length); 
77         mobjCryptoService.Key = GetLegalKey(); 
78         mobjCryptoService.IV = GetLegalIV(); 
79         ICryptoTransform encrypto = mobjCryptoService.CreateDecryptor(); 
80         CryptoStream cs = new CryptoStream(ms, encrypto, CryptoStreamMode.Read); 
81         StreamReader sr = new StreamReader(cs); 
82         return sr.ReadToEnd(); 
83     }
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01 方法五：
02     using System.IO; 
03     using System.Security.Cryptography; 
04     using System.Text; 
05       
06     ... 
07       
08     //默认密钥向量 
09     private static byte[] Keys = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF }; 
10     /// <summary> 
11     /// DES加密字符串 
12     /// </summary> 
13     /// <param name="encryptString">待加密的字符串</param> 
14     /// <param name="encryptKey">加密密钥,要求为8位</param> 
15     /// <returns>加密成功返回加密后的字符串，失败返回源串</returns> 
16     public static string EncryptDES(string encryptString, string encryptKey) 
17     { 
18         try 
19         { 
20             byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8)); 
21             byte[] rgbIV = Keys; 
22             byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString); 
23             DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider(); 
24             MemoryStream mStream = new MemoryStream(); 
25             CryptoStream cStream = new CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write); 
26             cStream.Write(inputByteArray, 0, inputByteArray.Length); 
27             cStream.FlushFinalBlock(); 
28             return Convert.ToBase64String(mStream.ToArray()); 
29         } 
30         catch 
31         { 
32             return encryptString; 
33         } 
34     } 
35       
36     /// <summary> 
37     /// DES解密字符串 
38     /// </summary> 
39     /// <param name="decryptString">待解密的字符串</param> 
40     /// <param name="decryptKey">解密密钥,要求为8位,和加密密钥相同</param> 
41     /// <returns>解密成功返回解密后的字符串，失败返源串</returns> 
42     public static string DecryptDES(string decryptString, string decryptKey) 
43     { 
44         try 
45         { 
46             byte[] rgbKey = Encoding.UTF8.GetBytes(decryptKey); 
47             byte[] rgbIV = Keys; 
48             byte[] inputByteArray = Convert.FromBase64String(decryptString); 
49             DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider(); 
50             MemoryStream mStream = new MemoryStream(); 
51             CryptoStream cStream = new CryptoStream(mStream, DCSP.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write); 
52             cStream.Write(inputByteArray, 0, inputByteArray.Length); 
53             cStream.FlushFinalBlock(); 
54             return Encoding.UTF8.GetString(mStream.ToArray()); 
55         } 
56         catch 
57         { 
58             return decryptString; 
59         } 
60     }
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01 方法六(文件加密)：
02     using System.IO; 
03     using System.Security.Cryptography; 
04     using System.Text; 
05       
06     ... 
07       
08     //加密文件 
09     private static void EncryptData(String inName, String outName, byte[] desKey, byte[] desIV) 
10     { 
11         //Create the file streams to handle the input and output files. 
12         FileStream fin = new FileStream(inName, FileMode.Open, FileAccess.Read); 
13         FileStream fout = new FileStream(outName, FileMode.OpenOrCreate, FileAccess.Write); 
14         fout.SetLength(0); 
15       
16         //Create variables to help with read and write. 
17         byte[] bin = new byte[100]; //This is intermediate storage for the encryption. 
18         long rdlen = 0;              //This is the total number of bytes written. 
19         long totlen = fin.Length;    //This is the total length of the input file. 
20         int len;                     //This is the number of bytes to be written at a time. 
21       
22         DES des = new DESCryptoServiceProvider(); 
23         CryptoStream encStream = new CryptoStream(fout, des.CreateEncryptor(desKey, desIV), CryptoStreamMode.Write); 
24       
25         //Read from the input file, then encrypt and write to the output file. 
26         while (rdlen < totlen) 
27         { 
28             len = fin.Read(bin, 0, 100); 
29             encStream.Write(bin, 0, len); 
30             rdlen = rdlen + len; 
31         } 
32       
33         encStream.Close(); 
34         fout.Close(); 
35         fin.Close(); 
36     } 
37       
38     //解密文件 
39     private static void DecryptData(String inName, String outName, byte[] desKey, byte[] desIV) 
40     { 
41         //Create the file streams to handle the input and output files. 
42         FileStream fin = new FileStream(inName, FileMode.Open, FileAccess.Read); 
43         FileStream fout = new FileStream(outName, FileMode.OpenOrCreate, FileAccess.Write); 
44         fout.SetLength(0); 
45       
46         //Create variables to help with read and write. 
47         byte[] bin = new byte[100]; //This is intermediate storage for the encryption. 
48         long rdlen = 0;              //This is the total number of bytes written. 
49         long totlen = fin.Length;    //This is the total length of the input file. 
50         int len;                     //This is the number of bytes to be written at a time. 
51       
52         DES des = new DESCryptoServiceProvider(); 
53         CryptoStream encStream = new CryptoStream(fout, des.CreateDecryptor(desKey, desIV), CryptoStreamMode.Write); 
54       
55         //Read from the input file, then encrypt and write to the output file. 
56         while (rdlen < totlen) 
57         { 
58             len = fin.Read(bin, 0, 100); 
59             encStream.Write(bin, 0, len); 
60             rdlen = rdlen + len; 
61         } 
62       
63         encStream.Close(); 
64         fout.Close(); 
65         fin.Close(); 
66   
67 }
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01 using System;
02 using System.Security.Cryptography;//这个是处理文字编码的前提
03 using System.Text;
04 using System.IO;
05 /// <summary>
06 /// DES加密方法
07 /// </summary>
08 /// <param name="strPlain">明文</param>
09 /// <param name="strDESKey">密钥</param>
10 /// <param name="strDESIV">向量</param>
11 /// <returns>密文</returns>
12 public string DESEncrypt(string strPlain,string strDESKey,string strDESIV)
13 {
14  //把密钥转换成字节数组
15  byte[] bytesDESKey=ASCIIEncoding.ASCII.GetBytes(strDESKey);
16  //把向量转换成字节数组
17  byte[] bytesDESIV=ASCIIEncoding.ASCII.GetBytes(strDESIV);
18  //声明1个新的DES对象
19  DESCryptoServiceProvider desEncrypt=new DESCryptoServiceProvider();
20  //开辟一块内存流
21  MemoryStream msEncrypt=new MemoryStream();
22  //把内存流对象包装成加密流对象
23  CryptoStream csEncrypt=new CryptoStream(msEncrypt,desEncrypt.CreateEncryptor(bytesDESKey,bytesDESIV),CryptoStreamMode.Write);
24  //把加密流对象包装成写入流对象
25  StreamWriter swEncrypt=new StreamWriter(csEncrypt);
26  //写入流对象写入明文
27  swEncrypt.WriteLine(strPlain);
28  //写入流关闭
29  swEncrypt.Close();
30  //加密流关闭
31  csEncrypt.Close();
32  //把内存流转换成字节数组，内存流现在已经是密文了
33  byte[] bytesCipher=msEncrypt.ToArray();
34  //内存流关闭
35  msEncrypt.Close();
36  //把密文字节数组转换为字符串，并返回
37  return UnicodeEncoding.Unicode.GetString(bytesCipher);
38 }
39   
40   
41   
42   
43 /// <summary>
44 /// DES解密方法
45 /// </summary>
46 /// <param name="strCipher">密文</param>
47 /// <param name="strDESKey">密钥</param>
48 /// <param name="strDESIV">向量</param>
49 /// <returns>明文</returns>
50 public string DESDecrypt(string strCipher,string strDESKey,string strDESIV)
51 {
52  //把密钥转换成字节数组
53  byte[] bytesDESKey=ASCIIEncoding.ASCII.GetBytes(strDESKey);
54  //把向量转换成字节数组
55  byte[] bytesDESIV=ASCIIEncoding.ASCII.GetBytes(strDESIV);
56  //把密文转换成字节数组
57  byte[] bytesCipher=UnicodeEncoding.Unicode.GetBytes(strCipher);
58  //声明1个新的DES对象
59  DESCryptoServiceProvider desDecrypt=new DESCryptoServiceProvider();
60  //开辟一块内存流，并存放密文字节数组
61  MemoryStream msDecrypt=new MemoryStream(bytesCipher);
62  //把内存流对象包装成解密流对象
63  CryptoStream csDecrypt=new CryptoStream(msDecrypt,desDecrypt.CreateDecryptor(bytesDESKey,bytesDESIV),CryptoStreamMode.Read);
64  //把解密流对象包装成读出流对象
65  StreamReader srDecrypt=new StreamReader(csDecrypt);
66  //明文=读出流的读出内容
67  string strPlainText=srDecrypt.ReadLine();
68  //读出流关闭
69  srDecrypt.Close();
70  //解密流关闭
71  csDecrypt.Close();
72  //内存流关闭
73  msDecrypt.Close();
74  //返回明文
75  return strPlainText;
76 }
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原文地址：https://www.cnblogs.com/skyshenwei/p/1677064.html