they didn't crack the algo - they figured out the entry points in the iTunes binaries on the PC to jump to the decrypt stuff.

To do the equivalent on the Mac will require many hours in a debugger looking at asm to work out the equivalent offsets in the binary.

Not likely to happen unless there is a serious Mac cracker out there willing to step through iTunes binary for dozens of hours to work out the equivalent entry points. Otherwise, the source is useless.