Comment 12 for bug 509562

OK, my patch changes what was expected to be 32 bits of randomness to 31 bits of randomness.

Its probably not that big of a deal, but upstream should probably do:
- key = hex(BN.rand(16 * 8,top=0))[2:34]
+ key = hex(BN.rand(17 * 8,top=0))[3:35]

that will get the same 32 bits of randomness, but will still have the 32 bits of random number that were intended.