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- q = 2**255 - 19
- def expmod(b,e,m):
- if e == 0: return 1
- t = expmod(b,e/2,m)**2 % m
- if e & 1: t = (t*b) % m
- return t
- def inv(x):
- return expmod(x,q-2,q)
- def radix255(x):
- x = x % q
- if x + x > q: x -= q
- x = [x,0,0,0,0,0,0,0,0,0]
- bits = [26,25,26,25,26,25,26,25,26,25]
- for i in range(9):
- carry = (x[i] + 2**(bits[i]-1)) / 2**bits[i]
- x[i] -= carry * 2**bits[i]
- x[i + 1] += carry
- result = ""
- for i in range(9):
- result = result+str(x[i])+","
- result = result+str(x[9])
- return result
- d = -121665 * inv(121666)
- print radix255(d)
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