Length of the data to decrypt is invalid - Solve

Question

Hi Developers,

I have created a new windows form application for Decrypt a string with password. Its working fine.

But sometime if the length is too it throws the following error.

"Length of the data to decrypt is invalid"

AES password : 8468A97B4373415365537265744B6579746869834973215365637261745B6579

public static byte[] AES_DECRYPT(string text, string hexPassword)

{

byte[] originalBytes = HexStringToByte(text);

byte[] passwordBytes = HexStringToByte(hexPassword);

byte[] encryptedBytes = null;

using (MemoryStream ms = new MemoryStream())

{

using (RijndaelManaged AES = new RijndaelManaged())

{

AES.Padding = PaddingMode.Zeros;

AES.Key = passwordBytes;

AES.Mode = CipherMode.ECB;

using (CryptoStream cs = new CryptoStream(ms, AES.CreateDecryptor(), CryptoStreamMode.Write))

{

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

cs.Close();

}

encryptedBytes = ms.ToArray();

}

}

return encryptedBytes;

}

for text

private static byte[] HexStringToByte(string hexString)

{

try

{

int bytesCount = (hexString.Length) / 2;

byte[] bytes = new byte[bytesCount];

for (int x = 0; x < bytesCount; ++x)

{

bytes[x] = Convert.ToByte(hexString.Substring(x * 2, 2), 16);

}

return bytes;

}

catch

{

throw;

}

}

for password

private static byte[] HexStringToByte(string hexString)

{

try

{

int bytesCount = (hexString.Length) / 2;

byte[] bytes = new byte[bytesCount];

for (int x = 0; x < bytesCount; ++x)

{

bytes[x] = Convert.ToByte(hexString.Substring(x * 2, 2), 16);

}

return bytes;

}

catch

{

throw;

}

}

plese suggest me how to fix this error. Am using the following code

Thanks & Regards

Paul.S