I am getting the error for the below query

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Hello,

C#

cs.Write(inputBytearray, 0, inputBytearray.Length);
                  cs.FlushFinalBlock();

here i am getting error like

'Length of the data to decrypt is invalid.'

any one help me

thanks.

Posted 26-Dec-11 18:37pm

K N R

Updated 26-Dec-11 18:38pm

Mehdi Gholam

v2

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3 solutions

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Varun Sareen · Answer 1 · 2011-12-26T18:47:00

Solution 1

Dear Friend,

This error might come due to the encryption technique applied. you might have applied an encryption technique with lower bit and you are encrypting a larger value thats why you are not able to get the decryption write.

Please paste the encryption technique applied and also the string you are encrypting so that i can suggest you to what to do.

Also you can refer this link for reference:-

https://forums.asp.net/t/1225162.aspx[^]

Hope this will help you out.

Thanks

Posted 26-Dec-11 18:47pm

Varun Sareen

Comments

K N R 27-Dec-11 0:53am

hi varun,

this is the encrypted code

public static string EncryptString(string key, string data)
{
if (key.Length != 8) throw new Exception("Key length must be equal 8.");
if (data.Length <= 0) throw new Exception("Length of string to encrypt can not be zero.");
byte[] inputBytearray=new byte[data.Length];
byte[] keyByteArray = new byte[key.Length];
string Result = "";
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
using (MemoryStream ms = new MemoryStream())
{
keyByteArray = Encoding.UTF8.GetBytes(key);
inputBytearray = Encoding.UTF8.GetBytes(data);
using (CryptoStream cs = new CryptoStream(ms,des.CreateEncryptor(keyByteArray,inputBytearray),CryptoStreamMode.Write))
{
cs.Write(inputBytearray,0,inputBytearray.Length);
cs.FlushFinalBlock();
}
Result = Convert.ToBase64String(ms.ToArray());
}
return Result;

}

K N R 27-Dec-11 0:54am

this one is decrypted code

public DataSet ReadEncrypteddataset()
{
DataSet set = new DataSet();
string Encrypteddata = "";
using (StreamReader reader = new StreamReader(Filepath))
{
Encrypteddata = reader.ReadToEnd();
}
string DecryptedData = DecryptString(myKey, Encrypteddata);
set.ReadXml(new StringReader(DecryptedData));
return set;
}

public static string DecryptString(string key, string data)
{
if (key.Length != 8) throw new Exception("Key length must be equal 8.");
if (data.Length <= 0) throw new Exception("Length of string to encrypt can not be zero.");
byte[] inputBytearray = new byte[data.Length];
byte[] keyByteArray = new byte[key.Length];
string Result = "";
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
using (MemoryStream ms = new MemoryStream())
{
keyByteArray = Encoding.UTF8.GetBytes(key);
inputBytearray = Encoding.UTF8.GetBytes(data);
using (CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(keyByteArray, inputBytearray), CryptoStreamMode.Write))
{
//byte[] plainTextBytes = new byte[inputBytearray.Length];
//int decryptedByteCount = cs.Write(plainTextBytes, 0, plainTextBytes.Length);

cs.Write(inputBytearray, 0, inputBytearray.Length);
cs.FlushFinalBlock();
}
Result = Encoding.UTF8.GetString(ms.ToArray());
}
return Result;
}

Varun Sareen · Answer 2 · 2011-12-26T19:09:00

Dear KNR,

Try this code as this is perfectly fine for me. I hope this will help you out:-

public string EncryptString(string pwd)
        {
          try
          {
            byte[] strByte = new byte[pwd.Length];
            strByte = System.Text.Encoding.UTF8.GetBytes(pwd);
            string encodedPwd = Convert.ToBase64String(strByte);
            return encodedPwd;
          }
          catch
          {
            return null;
          }
        }
        public string DecryptString(string pwd)
        {
          try
          {
            UTF8Encoding encoder = new System.Text.UTF8Encoding();
            Decoder utf8Decode = encoder.GetDecoder();

            byte[] toDecode_byte = Convert.FromBase64String(pwd);
            int charCount = utf8Decode.GetCharCount(toDecode_byte, 0, toDecode_byte.Length);
            char[] decoded_char = new char[charCount];
            utf8Decode.GetChars(toDecode_byte, 0, toDecode_byte.Length, decoded_char, 0);
            string decodedPwd = new string(decoded_char);
            return decodedPwd;
          }
          catch
          {
            return null;
          }
        }

koolprasad2003 · Answer 3 · 2011-12-26T19:11:00

Solution 3

http://stackoverflow.com/questions/845971/length-of-the-data-to-decrypt-is-invalid-exception-during-rijndael-decryption[^]

Posted 26-Dec-11 19:11pm

koolprasad2003