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  • C#编程之AES加密(一)

    这里我们主要参考一下官方的例程:

      1 using System;
      2 using System.IO;
      3 using System.Security.Cryptography;
      4 
      5 namespace Aes_Example
      6 {
      7     class AesExample
      8     {
      9         public static void Main()
     10         {
     11             string original = "Here is some data to encrypt!";
     12 
     13             // Create a new instance of the Aes
     14             // class.  This generates a new key and initialization 
     15             // vector (IV).
     16             using (Aes myAes = Aes.Create())
     17             {
     18 
     19                 // Encrypt the string to an array of bytes.
     20                 byte[] encrypted = EncryptStringToBytes_Aes(original, myAes.Key, myAes.IV);
     21 
     22                 // Decrypt the bytes to a string.
     23                 string roundtrip = DecryptStringFromBytes_Aes(encrypted, myAes.Key, myAes.IV);
     24 
     25                 //Display the original data and the decrypted data.
     26                 Console.WriteLine("Original:   {0}", original);
     27                 Console.WriteLine("Round Trip: {0}", roundtrip);
     28             }
     29             Console.ReadKey();
     30         }
     31         static byte[] EncryptStringToBytes_Aes(string plainText, byte[] Key, byte[] IV)
     32         {
     33             // Check arguments.
     34             if (plainText == null || plainText.Length <= 0)
     35                 throw new ArgumentNullException("plainText");
     36             if (Key == null || Key.Length <= 0)
     37                 throw new ArgumentNullException("Key");
     38             if (IV == null || IV.Length <= 0)
     39                 throw new ArgumentNullException("IV");
     40             byte[] encrypted;
     41 
     42             // Create an Aes object
     43             // with the specified key and IV.
     44             using (Aes aesAlg = Aes.Create())
     45             {
     46                 aesAlg.Key = Key;
     47                 aesAlg.IV = IV;
     48 
     49                 // Create an encryptor to perform the stream transform.
     50                 ICryptoTransform encryptor = aesAlg.CreateEncryptor(aesAlg.Key, aesAlg.IV);
     51 
     52                 // Create the streams used for encryption.
     53                 using (MemoryStream msEncrypt = new MemoryStream())
     54                 {
     55                     using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
     56                     {
     57                         using (StreamWriter swEncrypt = new StreamWriter(csEncrypt))
     58                         {
     59                             //Write all data to the stream.
     60                             swEncrypt.Write(plainText);
     61                         }
     62                         encrypted = msEncrypt.ToArray();
     63                     }
     64                 }
     65             }
     66 
     67 
     68             // Return the encrypted bytes from the memory stream.
     69             return encrypted;
     70 
     71         }
     72 
     73         static string DecryptStringFromBytes_Aes(byte[] cipherText, byte[] Key, byte[] IV)
     74         {
     75             // Check arguments.
     76             if (cipherText == null || cipherText.Length <= 0)
     77                 throw new ArgumentNullException("cipherText");
     78             if (Key == null || Key.Length <= 0)
     79                 throw new ArgumentNullException("Key");
     80             if (IV == null || IV.Length <= 0)
     81                 throw new ArgumentNullException("IV");
     82 
     83             // Declare the string used to hold
     84             // the decrypted text.
     85             string plaintext = null;
     86 
     87             // Create an Aes object
     88             // with the specified key and IV.
     89             using (Aes aesAlg = Aes.Create())
     90             {
     91                 aesAlg.Key = Key;
     92                 aesAlg.IV = IV;
     93 
     94                 // Create a decryptor to perform the stream transform.
     95                 ICryptoTransform decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV);
     96 
     97                 // Create the streams used for decryption.
     98                 using (MemoryStream msDecrypt = new MemoryStream(cipherText))
     99                 {
    100                     using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
    101                     {
    102                         using (StreamReader srDecrypt = new StreamReader(csDecrypt))
    103                         {
    104 
    105                             // Read the decrypted bytes from the decrypting stream
    106                             // and place them in a string.
    107                             plaintext = srDecrypt.ReadToEnd();
    108                         }
    109                     }
    110                 }
    111 
    112             }
    113 
    114             return plaintext;
    115 
    116         }
    117     }
    118 }
    View Code

    当然,具体的解说,可以参考一下官方说明,以下是例程的链接:

    https://docs.microsoft.com/en-us/dotnet/api/system.security.cryptography.aes?view=netframework-4.8

    这例程,运行后,我们添加一个暂停,就可以查看运行结果,在main结束前,添加: Console.ReadKey(); ,大家也可以添加其他的参数显示出来。具体这里就一一列举了。

    后续,我们将针对AES加密做更进一步的说明。

    End.

    谢谢.

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  • 原文地址:https://www.cnblogs.com/lumao1122-Milolu/p/11957924.html
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