changes

aesutil是一个小型的库和命令行程序

25. July 2002:
- Added input file option
- Added input byte count option
21. July 2002:
- Upgrade to getopts 0.2.0
- Handled invalid base64 input
- Handled too short decryption input (<16 bytes, which is the  init vector)
19. July 2002:
- Windows Port of the command line utility
- Better option handling thanks to Steve Mertz getopts
16. August 2002:
- Removed debug test
- Added option for outputfile
21. August 2002:
- Only free args if there are any
22. August 2002:
- End base64 string with '\0' (...)
- Upgrade to getopts 0.3
26. August 2002:
- Add version information
05. February 2003:
- Fix another off-by-one (thanks to Richard Curnow)
- Add option to format base64 output (by Daniel J. Zavitz)