C#简单的加密类

1.加密

 1 public class EncryptHepler {
 2         // 验值 
 3         static string saltValue = "XXXX";
 4         // 密码值 
 5         static string pwdValue = "XXXX";
 6  
 7         /// <summary>
 8         /// 加密
 9         /// </summary>
10         public static string Encrypt( string input ) {
11             byte[ ] data = System.Text.UTF8Encoding.UTF8.GetBytes( input );
12             byte[ ] salt = System.Text.UTF8Encoding.UTF8.GetBytes( saltValue );
13  
14             // AesManaged - 高级加密标准(AES) 对称算法的管理类 
15             System.Security.Cryptography.AesManaged aes = new System.Security.Cryptography.AesManaged( );
16             // Rfc2898DeriveBytes - 通过使用基于 HMACSHA1 的伪随机数生成器，实现基于密码的密钥派生功能 (PBKDF2 - 一种基于密码的密钥派生函数) 
17             // 通过 密码 和 salt 派生密钥 
18             System.Security.Cryptography.Rfc2898DeriveBytes rfc = new System.Security.Cryptography.Rfc2898DeriveBytes( pwdValue, salt );
19  
20             aes.BlockSize = aes.LegalBlockSizes[0].MaxSize;
21             aes.KeySize = aes.LegalKeySizes[0].MaxSize;
22             aes.Key = rfc.GetBytes( aes.KeySize / 8 );
23             aes.IV = rfc.GetBytes( aes.BlockSize / 8 );
24  
25             // 用当前的 Key 属性和初始化向量 IV 创建对称加密器对象 
26             System.Security.Cryptography.ICryptoTransform encryptTransform = aes.CreateEncryptor( );
27             // 加密后的输出流 
28             System.IO.MemoryStream encryptStream = new System.IO.MemoryStream( );
29             // 将加密后的目标流（encryptStream）与加密转换（encryptTransform）相连接 
30             System.Security.Cryptography.CryptoStream encryptor = new System.Security.Cryptography.CryptoStream
31                 ( encryptStream, encryptTransform, System.Security.Cryptography.CryptoStreamMode.Write );
32  
33             // 将一个字节序列写入当前 CryptoStream （完成加密的过程）
34             encryptor.Write( data, 0, data.Length );
35             encryptor.Close( );
36             // 将加密后所得到的流转换成字节数组，再用Base64编码将其转换为字符串 
37             string encryptedString = Convert.ToBase64String( encryptStream.ToArray( ) );
38             return encryptedString;
39         }

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2.解密

 1 /// <summary>
 2         /// 解密
 3         /// </summary>
 4         public static string Decrypt( string input ) {
 5             byte[ ] encryptBytes = Convert.FromBase64String( input );
 6             byte[ ] salt = Encoding.UTF8.GetBytes( saltValue );
 7             System.Security.Cryptography.AesManaged aes = new System.Security.Cryptography.AesManaged( );
 8             System.Security.Cryptography.Rfc2898DeriveBytes rfc = new System.Security.Cryptography.Rfc2898DeriveBytes( pwdValue, salt );
 9  
10             aes.BlockSize = aes.LegalBlockSizes[0].MaxSize;
11             aes.KeySize = aes.LegalKeySizes[0].MaxSize;
12             aes.Key = rfc.GetBytes( aes.KeySize / 8 );
13             aes.IV = rfc.GetBytes( aes.BlockSize / 8 );
14  
15             // 用当前的 Key 属性和初始化向量 IV 创建对称解密器对象 
16             System.Security.Cryptography.ICryptoTransform decryptTransform = aes.CreateDecryptor( );
17             // 解密后的输出流 
18             System.IO.MemoryStream decryptStream = new System.IO.MemoryStream( );
19  
20             // 将解密后的目标流（decryptStream）与解密转换（decryptTransform）相连接 
21             System.Security.Cryptography.CryptoStream decryptor = new System.Security.Cryptography.CryptoStream(
22                 decryptStream, decryptTransform, System.Security.Cryptography.CryptoStreamMode.Write );
23             // 将一个字节序列写入当前 CryptoStream （完成解密的过程） 
24             decryptor.Write( encryptBytes, 0, encryptBytes.Length );
25             decryptor.Close( );
26  
27             // 将解密后所得到的流转换为字符串 
28             byte[ ] decryptBytes = decryptStream.ToArray( );
29             string decryptedString = UTF8Encoding.UTF8.GetString( decryptBytes, 0, decryptBytes.Length );
30             return decryptedString;
31         }
32     }//class end

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C#简单的加密类

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