RC5 has a bunch of parameters; see Ronald Rivest's paper at
http://theory.lcs.mit.edu/~rivest/rc5rev.ps for the
implementation details. The keyword parameters are:
- version:
The version
of the RC5 algorithm to use; currently the only legal value is
0x10 for RC5 1.0.
- wordsize:
The word size to use;
16 or 32 are the only legal values. (A larger word size is better, so
usually 32 will be used. 16-bit RC5 is probably only of academic
interest.)
- rounds:
The number of rounds to apply, the larger the more secure: this
can be any value from 0 to 255, so you will have to choose a value
balanced between speed and security.
