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  1. using System;
  2. using System.IO;
  3. using System.Security.Cryptography;
  4. using System.Text;
  5.  
  6. namespace Aes_Example
  7. {
  8.     class AesExample
  9.     {
  10.         // Mensagem que sera criptografada.
  11.         const string mensagem = "Mensagem que sera criptografada.";
  12.         // Senha definida da operadora.
  13.         const String chave = "uexDPnPr";
  14.  
  15.         public static void Main()
  16.         {
  17.             try
  18.             {
  19.                 byte[] pwdBytes = BuildKey(chave);
  20.  
  21.                 byte[] encrypted = EncryptStringToBytes_Aes(mensagem, pwdBytes);
  22.                 string roundtrip = DecryptStringFromBytes_Aes(encrypted, pwdBytes);
  23.  
  24.                 Console.WriteLine("Original:   {0}", mensagem);
  25.                 Console.WriteLine("Criptografado: {0}", Convert.ToBase64String(encrypted));
  26.                 Console.WriteLine("Descriptografado: {0}", roundtrip);
  27.                 Console.ReadKey();
  28.  
  29.             }
  30.             catch (Exception e)
  31.             {
  32.                 Console.WriteLine("Error: {0}", e.Message);
  33.             }
  34.         }
  35.  
  36.         static byte[] BuildKey(string chave)
  37.         {
  38.         	SHA256Managed sha256algorithm = new SHA256Managed();
  39.         	byte[] originalKeyBytes = Encoding.UTF8.GetBytes(chave);
  40.         	byte[] keyBytes = sha256algorithm.ComputeHash(originalKeyBytes);
  41.         	// primeiros 16 bytes do SHA-256        	
  42.         	Array.Resize(ref keyBytes, 16);
  43.  
  44.         	return keyBytes;
  45.         }
  46.  
  47.         static SymmetricAlgorithm GetCipher(byte[] key)
  48.         {
  49.         	Aes aesAlg = Aes.Create("AES");
  50.         	aesAlg.BlockSize = 128;
  51.             aesAlg.KeySize = 128;
  52.             aesAlg.Mode = CipherMode.ECB;
  53.             aesAlg.Padding =  PaddingMode.PKCS7;  
  54.             aesAlg.Key = key;
  55.             aesAlg.IV = new byte[16];
  56.  
  57.  
  58.             return aesAlg;
  59.         }
  60.  
  61.         static byte[] EncryptStringToBytes_Aes(string plainText, byte[] Key)
  62.         {
  63.             // Check arguments.
  64.             if (plainText == null || plainText.Length <= 0)
  65.                 throw new ArgumentNullException("plainText");
  66.             if (Key == null || Key.Length <= 0)
  67.                 throw new ArgumentNullException("Key");
  68.             byte[] encrypted;
  69.             // Create an Aes object
  70.             // with the specified key and IV.
  71.             using (SymmetricAlgorithm aesAlg = GetCipher(Key))
  72.             {
  73.                 // Create a decrytor to perform the stream transform.
  74.                 ICryptoTransform encryptor = aesAlg.CreateEncryptor(aesAlg.Key, aesAlg.IV);
  75.  
  76.                 // Create the streams used for encryption.
  77.                 using (MemoryStream msEncrypt = new MemoryStream())
  78.                 {
  79.                     using (CryptoStream csEncrypt = new CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write))
  80.                     {
  81.                         using (StreamWriter swEncrypt = new StreamWriter(csEncrypt))
  82.                         {
  83.  
  84.                             //Write all data to the stream.
  85.                             swEncrypt.Write(plainText);
  86.                         }
  87.                         encrypted = msEncrypt.ToArray();
  88.                     }
  89.                 }
  90.             }
  91.  
  92.             // Return the encrypted bytes from the memory stream.
  93.             return encrypted;
  94.         }
  95.  
  96.         static string DecryptStringFromBytes_Aes(byte[] cipherText, byte[] Key)
  97.         {
  98.             // Check arguments.
  99.             if (cipherText == null || cipherText.Length <= 0)
  100.                 throw new ArgumentNullException("cipherText");
  101.             if (Key == null || Key.Length <= 0)
  102.                 throw new ArgumentNullException("Key");
  103.  
  104.             // Declare the string used to hold
  105.             // the decrypted text.
  106.             string plaintext = null;
  107.  
  108.             // Create an Aes object
  109.             // with the specified key and IV.
  110.             using (SymmetricAlgorithm aesAlg = GetCipher(Key))
  111.             {
  112.  
  113.                 // Create a decrytor to perform the stream transform.
  114.                 ICryptoTransform decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV);
  115.  
  116.                 // Create the streams used for decryption.
  117.                 using (MemoryStream msDecrypt = new MemoryStream(cipherText))
  118.                 {
  119.                     using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
  120.                     {
  121.                         using (StreamReader srDecrypt = new StreamReader(csDecrypt))
  122.                         {
  123.  
  124.                             // Read the decrypted bytes from the decrypting  stream
  125.                             // and place them in a string.
  126.                             plaintext = srDecrypt.ReadToEnd();
  127.                         }
  128.                     }
  129.                 }
  130.             }
  131.             return plaintext;
  132.         }
  133.     }
  134. }
Success #stdin #stdout 0.02s 30184KB
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stdin
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Standard input is empty
stdout
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Original:   Mensagem que sera criptografada.
Criptografado: JGTfV+CntuSutHK0LLeZix9Teu87ynjpJN8d3OaQdWge6yN0stn7/1I5KmMJEFYk
Descriptografado: Mensagem que sera criptografada.
https://ideone.com/rKpR3J
http://pt.stackoverflow.com/q/152080/100
language:
C# (gmcs 5.20.1)
created:
7 years ago
visibility:
secret

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