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copied!<p>The size of the plain text does not matter. Just make sure you use the exact same IV and Key along with the encrypted bytes in the decryptStringFromBytes_AES(byte[] cipherText, byte[] Key, byte[] IV) method. That will return back to you the entered plain text.</p> <p>For example:</p> <pre><code> string plain_text = "Cool this works"; byte[] iv = new byte[] { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F}; byte[] key = new byte[] { 0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99, 0xAA, 0xBB, 0xCC, 0xDD, 0xEE, 0xFF }; byte[] encrytped_text = encryptStringToBytes_AES(plain_text, key, iv); string plain_text_again = decryptStringFromBytes_AES(encrypted_text, key, iv); </code></pre> <p>Here you should see that plain-text and plain-text-again are the same. Now go ahead and change plain_text to anything you want and see that this works fine.</p> <p>The default values for RijndaelManaged are:<br> BlockSize: 128<br> KeySize: 256<br> Mode: CipherMode.CBC<br> Padding: PaddingMode.PKCS7<br></p> <p>The valid IV sizes are:<br> 128, 192, 256 bits (This is the BlockSize, make sure to set it to size IV you are using)<br> The valid Key sizes are:<br> 128, 192, 256 bits (This is the KeySize, make sure to set it to the size key you are using)<br></p> <p>This means that the byte[] iv can be 16, 24, or 32 bytes (in my above example its 16 bytes) and the byte[] key can also be 16, 24, or 32 bytes (in my above example its 16 bytes).</p> <p>Hope that helps.</p>

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