public void TestChallenge15()
{
var blockSize = 16;
var str = "ICE ICE BABY";
var bytes = System.Text.Encoding.ASCII.GetBytes(str);
var valid = PaddingUtil.Pad(bytes, blockSize);
Assert.IsTrue(PaddingUtil.ValidPadding(valid, blockSize));
var invalid = new List <byte>(bytes);
invalid.AddRange(new byte[] { 0x05, 0x05, 0x05, 0x05 });
Assert.IsFalse(PaddingUtil.ValidPadding(invalid.ToArray(), blockSize));
invalid = new List <byte>(bytes);
invalid.AddRange(new byte[] { 0x01, 0x02, 0x03, 0x04 });
Assert.IsFalse(PaddingUtil.ValidPadding(invalid.ToArray(), blockSize));
}
public static bool IsValid(byte[] data)
{
var decryted = AesCbc.Decrypt(Key, Iv, data, false);
return(PaddingUtil.ValidPadding(decryted, BlockSizeBytes));
}