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POSystem.Security.Cryptography and "Bad Data" - character encoding?
 

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  1. POSystem.Security.Cryptography and "Bad Data" - character encoding?
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    <p>The class that produces "Bad Data" errors:</p> <pre> <code> using System; using System.Collections.Generic; using System.Security.Cryptography; using System.Text; using System.Windows.Forms; namespace MyNameSpace { public class RSAcrypt { private string _encryptedData; private string _decryptedData; public string EncryptedData { get { return _encryptedData; } set { _encryptedData = value; } } public string DecryptedData { get { return _decryptedData; } set { _decryptedData = value; } } public RSAcrypt() { } /// &lt;param name="CryptAction"&gt; The action to perform on the string {Encrypt|Decrypt} &lt;/param &gt; /// &lt;param name="StringToCrypt"&gt; A string to perform the Action on &lt;/param&gt; public RSAcrypt(string CryptAction, string StringToCrypt) { UnicodeEncoding thisUnicodeEncoding = new UnicodeEncoding(); RSACryptoServiceProvider thisRSACryptoServiceProvider = new RSACryptoServiceProvider(); byte[] _stringToCrypt = thisUnicodeEncoding.GetBytes(StringToCrypt); switch (CryptAction) { case "Encrypt": byte[] encryptedData = Encrypt(_stringToCrypt, thisRSACryptoServiceProvider.ExportParameters(false)); _encryptedData = thisUnicodeEncoding.GetString(encryptedData); break; case "Decrypt": byte[] decryptedData = Decrypt(_stringToCrypt, thisRSACryptoServiceProvider.ExportParameters(true)); _decryptedData = thisUnicodeEncoding.GetString(decryptedData); break; default: break; } } static private byte[] Encrypt(byte[] DataToEncrypt, RSAParameters keyInfo) { RSACryptoServiceProvider RSA = new RSACryptoServiceProvider(); RSA.ImportParameters(keyInfo); return RSA.Encrypt(DataToEncrypt, false); } static private byte[] Decrypt(byte[] DataToDecrypt, RSAParameters keyInfo) { #region Temporary Assignment - Remove before build byte[] tmpVal = null; #endregion RSACryptoServiceProvider RSA = new RSACryptoServiceProvider(); try { RSA.ImportParameters(keyInfo); #region Temporary Assignment - Remove before build tmpVal = RSA.Decrypt(DataToDecrypt, false); #endregion } catch (Exception ex) { MessageBox.Show("Error: " + ex.Message, "Exception Thrown"); } #region Temporary Assignment - Remove before build return tmpVal; #endregion } } } </code> </pre> <p><b> Is there anything that I can change in this class that would allow me to check the encoding prior to passing the byte array to Encrypt / Decrypt? </b></p> <p>It seems like I have a reference around here somewhere, but I am becoming frustrated, so I thought it would at least help if I stopped to do something other than reading and compiling...</p> <p>BTW, I am calling this class to write to a password to an XML file using the Nini initialization framework. <a href="http://nini.sourceforge.net/manual.php#ASimpleExample" rel="nofollow noreferrer"><a href="http://nini.sourceforge.net/manual.php#ASimpleExample" rel="nofollow noreferrer">http://nini.sourceforge.net/manual.php#ASimpleExample</a></a></p> <p>Also, I used <a href="http://www.flos-freeware.ch/notepad2.html" rel="nofollow noreferrer">Notepad2</a> to change the file encoding (UTF-8) before I wrote to the XML file.</p> <p>That was after the program halted after I compiled the first time. Using the debugger, I was able to see that the encoding was different between the XML data in memory (UTF-8) and the data on disk (ANSI).</p> <p>That does not appear to be the case now, but the program still halts, referencing bad data returned from the Decrypt portion of RSAcrypt().</p> <p>(also note that Encrypt and Decrypt were identical methods before my frustration set in, they do function the same, but I wanted to try to capture addition exception information related to the bad data claim. Of course, you will notice that I allowed my frustration to handicap my code ;-) )</p> <p>Any suggestions, ideas or references would be great.</p> <p>TIA,</p> <p>E</p>
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    1. USEtherealMonkey
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    1. COIf you are encrypting data to be stored in an a file, use AES. It's more performant, and is a symmetric cipher.
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      1. USAlan
    2. CORSA is better suited if you are passing sensitive data to a secondary party.
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    3. COThank you Alan, I was planning to move to another cipher once the application is working. The system will be on a private subnet with physical access limited, but I will be writing private information to the DB, so all of the information will need to be crypted. Thanks again, E
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