C# Same encryption algorithm, same input, different result.

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I use this for security in a windows application, and it is important that if a user encrypts the same string they get the same result as any other user who encrypts the exact same string. I have been using this routine for 5 years in a windows application. Almost all the time, this works perfectly. However once in a great while, I will get a user who does not get the same result as everyone else.

In the code below, I changed the sEncriptKey and sInitVector values, however the values I am using are of the correct length and made up of simple just alpha numeric characters that never change. Also, sText is usually pretty small, like 8 to 30 characters.

Thanks for the help.

public static string EncryptString(string sText) {

   string sEncriptKey = "012345678901234567890123456789AA";// 32 Chars
   string sInitVector = "0123456789ABCDEF"; // 16 Chars;

   byte[] oByteArrayText = Encoding.UTF8.GetBytes(sText);

   System.Security.Cryptography.SymmetricAlgorithm rijn = SymmetricAlgorithm.Create();

   MemoryStream ms = new MemoryStream();
   byte[] rgbIV = Encoding.ASCII.GetBytes(sInitVector);
   byte[] key = Encoding.ASCII.GetBytes(sEncriptKey);
   CryptoStream cs = new CryptoStream(ms, rijn.CreateEncryptor(key, rgbIV), CryptoStreamMode.Write);

   cs.Write(oByteArrayText, 0, oByteArrayText.Length);

   cs.Close();

   return Convert.ToBase64String(ms.ToArray());
}

asked 1 min ago

user3587730

1