public static byte[] RemovePadding(PaddingMode mode, byte[] bytes)
{
switch (mode)
{
case PaddingMode.None:
case PaddingMode.Zeros:
return(ByteUtilities.Clone(bytes));
case PaddingMode.ANSIX923:
return(RemoveAnsiX923Padding(bytes));
case PaddingMode.ISO10126:
return(RemoveIso10126Padding(bytes));
case PaddingMode.PKCS7:
return(RemovePkcs7Padding(bytes));
default:
throw new NotImplementedException("Padding mode not implemented");
}
}
public static byte[] ApplyPadding(PaddingMode mode, byte[] bytes, int blockSizeInBytes)
{
int paddingBytesNeeded = GetPaddingBytesNeeded(mode, bytes.Length, blockSizeInBytes);
if (paddingBytesNeeded == 0)
{
// sanity check
return(ByteUtilities.Clone(bytes));
}
byte[] output = new byte[blockSizeInBytes];
Buffer.BlockCopy(bytes, 0, output, 0, bytes.Length);
switch (mode)
{
case PaddingMode.ANSIX923:
ApplyAnsiX923Padding(output, paddingBytesNeeded);
break;
case PaddingMode.ISO10126:
ApplyIso10126Padding(output, paddingBytesNeeded);
break;
case PaddingMode.PKCS7:
ApplyPkcs7Padding(output, paddingBytesNeeded);
break;
case PaddingMode.Zeros:
// nop
break;
default:
throw new NotImplementedException("Padding mode not implemented");
}
return(output);
}