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0

I make a chat application and I use AES algorithm. But I see this error " the input data is not complete block".

This is my code:

 public static string DecryptStringFromBytes_Aes(byte[] cipherText, string key, string mode)
 cipherText.Length <= 0)
 throw new ArgumentNullException("cipherText");

 // Declare the string used to hold
 // the decrypted text.
 string plaintext = null;

 // Create an Aes object
 // with the specified key and IV.
 using (Aes aesAlg = Aes.Create())
 
 if (mode == "ECB") aesAlg.Mode = CipherMode.ECB;
 else if (mode == "CBC") aesAlg.Mode = CipherMode.CBC;
 else if (mode == "CFB") aesAlg.Mode = CipherMode.CFB;

 aesAlg.Key = Convert.FromBase64String(key);
 aesAlg.IV = ASCIIEncoding.ASCII.GetBytes(key.Substring(0, 16));

 // Create a decryptor to perform the stream transform.
 ICryptoTransform decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV);

 // Create the streams used for decryption.
 using (MemoryStream msDecrypt = new MemoryStream(cipherText))
 
 using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
 
 using (StreamReader srDecrypt = new StreamReader(csDecrypt))
 

 // Read the decrypted bytes from the decrypting stream
 // and place them in a string.
 plaintext = srDecrypt.ReadToEnd();
 
 
 
 
 return plaintext;
 

The error is in line: plaintext = srDecrypt.ReadToEnd();
I don't know why.

Help me, please. Thank you very much.

c# aes

share|improve this question

edited Mar 9 at 2:48

John

13.8k32645

asked Mar 9 at 2:44

phong tro cho thuephong tro cho thue

1

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Picture is not really helpful. Please remove the image and try to correctly catch the exception into a console or a log file. Then provide the actual error text in your question.
  
  – LoneWanderer
  Mar 9 at 2:47
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I have no idea about the rest of your code, but if you're using sockets, remember that one call to Read() doesn't necessarily return a whole "message", or even a single message. What might be two messages sent client-side might arrive in one read, or in three reads, etc.
  
  – John
  Mar 9 at 2:49
  
  

  
  
  
  

add a comment | 

0

I make a chat application and I use AES algorithm. But I see this error " the input data is not complete block".

This is my code:

 public static string DecryptStringFromBytes_Aes(byte[] cipherText, string key, string mode)
 cipherText.Length <= 0)
 throw new ArgumentNullException("cipherText");

 // Declare the string used to hold
 // the decrypted text.
 string plaintext = null;

 // Create an Aes object
 // with the specified key and IV.
 using (Aes aesAlg = Aes.Create())
 
 if (mode == "ECB") aesAlg.Mode = CipherMode.ECB;
 else if (mode == "CBC") aesAlg.Mode = CipherMode.CBC;
 else if (mode == "CFB") aesAlg.Mode = CipherMode.CFB;

 aesAlg.Key = Convert.FromBase64String(key);
 aesAlg.IV = ASCIIEncoding.ASCII.GetBytes(key.Substring(0, 16));

 // Create a decryptor to perform the stream transform.
 ICryptoTransform decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV);

 // Create the streams used for decryption.
 using (MemoryStream msDecrypt = new MemoryStream(cipherText))
 
 using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
 
 using (StreamReader srDecrypt = new StreamReader(csDecrypt))
 

 // Read the decrypted bytes from the decrypting stream
 // and place them in a string.
 plaintext = srDecrypt.ReadToEnd();
 
 
 
 
 return plaintext;
 

The error is in line: plaintext = srDecrypt.ReadToEnd();
I don't know why.

Help me, please. Thank you very much.

c# aes

share|improve this question

edited Mar 9 at 2:48

John

13.8k32645

asked Mar 9 at 2:44

phong tro cho thuephong tro cho thue

1

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Picture is not really helpful. Please remove the image and try to correctly catch the exception into a console or a log file. Then provide the actual error text in your question.
  
  – LoneWanderer
  Mar 9 at 2:47
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I have no idea about the rest of your code, but if you're using sockets, remember that one call to Read() doesn't necessarily return a whole "message", or even a single message. What might be two messages sent client-side might arrive in one read, or in three reads, etc.
  
  – John
  Mar 9 at 2:49
  
  

  
  
  
  

add a comment | 

I make a chat application and I use AES algorithm. But I see this error " the input data is not complete block".

This is my code:

 public static string DecryptStringFromBytes_Aes(byte[] cipherText, string key, string mode)
 cipherText.Length <= 0)
 throw new ArgumentNullException("cipherText");

 // Declare the string used to hold
 // the decrypted text.
 string plaintext = null;

 // Create an Aes object
 // with the specified key and IV.
 using (Aes aesAlg = Aes.Create())
 
 if (mode == "ECB") aesAlg.Mode = CipherMode.ECB;
 else if (mode == "CBC") aesAlg.Mode = CipherMode.CBC;
 else if (mode == "CFB") aesAlg.Mode = CipherMode.CFB;

 aesAlg.Key = Convert.FromBase64String(key);
 aesAlg.IV = ASCIIEncoding.ASCII.GetBytes(key.Substring(0, 16));

 // Create a decryptor to perform the stream transform.
 ICryptoTransform decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV);

 // Create the streams used for decryption.
 using (MemoryStream msDecrypt = new MemoryStream(cipherText))
 
 using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
 
 using (StreamReader srDecrypt = new StreamReader(csDecrypt))
 

 // Read the decrypted bytes from the decrypting stream
 // and place them in a string.
 plaintext = srDecrypt.ReadToEnd();
 
 
 
 
 return plaintext;
 

The error is in line: plaintext = srDecrypt.ReadToEnd();
I don't know why.

Help me, please. Thank you very much.

c# aes

share|improve this question

edited Mar 9 at 2:48

John

13.8k32645

asked Mar 9 at 2:44

phong tro cho thuephong tro cho thue

1

 public static string DecryptStringFromBytes_Aes(byte[] cipherText, string key, string mode)
 cipherText.Length <= 0)
 throw new ArgumentNullException("cipherText");

 // Declare the string used to hold
 // the decrypted text.
 string plaintext = null;

 // Create an Aes object
 // with the specified key and IV.
 using (Aes aesAlg = Aes.Create())
 
 if (mode == "ECB") aesAlg.Mode = CipherMode.ECB;
 else if (mode == "CBC") aesAlg.Mode = CipherMode.CBC;
 else if (mode == "CFB") aesAlg.Mode = CipherMode.CFB;

 aesAlg.Key = Convert.FromBase64String(key);
 aesAlg.IV = ASCIIEncoding.ASCII.GetBytes(key.Substring(0, 16));

 // Create a decryptor to perform the stream transform.
 ICryptoTransform decryptor = aesAlg.CreateDecryptor(aesAlg.Key, aesAlg.IV);

 // Create the streams used for decryption.
 using (MemoryStream msDecrypt = new MemoryStream(cipherText))
 
 using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
 
 using (StreamReader srDecrypt = new StreamReader(csDecrypt))
 

 // Read the decrypted bytes from the decrypting stream
 // and place them in a string.
 plaintext = srDecrypt.ReadToEnd();
 
 
 
 
 return plaintext;
 

share|improve this question

edited Mar 9 at 2:48

John

13.8k32645

asked Mar 9 at 2:44

phong tro cho thuephong tro cho thue

1

share|improve this question

edited Mar 9 at 2:48

John

13.8k32645

asked Mar 9 at 2:44

phong tro cho thuephong tro cho thue

1

edited Mar 9 at 2:48

John

13.8k32645

edited Mar 9 at 2:48

John

13.8k32645

asked Mar 9 at 2:44

phong tro cho thuephong tro cho thue

1

asked Mar 9 at 2:44

phong tro cho thuephong tro cho thue

1