Ahh, you are correct, that is a large bug... How about this one?
def s2num(text):
if(len(text)==1):
return ord(text)
else:
return ord(text[0])+256*s2num(text[1:])
def cran_rand(min,max):
range=int(log(abs(max-min))/log(2))+1
num=max+1
if range%8==0:
crange=range/8
else:
crange=range/8+1
while(num>max):
num=min+s2num(urandom(crange))%(2**range)
return num