fixed bug in symmetric cipher implementation for byte strings
fixed bug in symmetric cipher implementation for byte strings

flomar/CrypTool-VS2015,flomar/CrypTool-VS2015,flomar/CrypTool-VS2015,flomar/CrypTool-VS2015,flomar/CrypTool-VS2015,flomar/CrypTool-VS2015,flomar/CrypTool-VS2015,flomar/CrypTool-VS2015