mirror of https://github.com/zcash/pasta.git
36 lines
762 B
Python
Executable File
36 lines
762 B
Python
Executable File
#!/usr/bin/env sage
|
|
|
|
load('hashtocurve.sage')
|
|
|
|
VERBOSE = False
|
|
|
|
k = 10
|
|
c = len(format((q-1)//2, 'b'))-1
|
|
assert c == 253
|
|
|
|
def grouphash(D, M):
|
|
(P, _, _) = hash_to_pallas_jacobian(M, D + b"-pallas_XMD:BLAKE2b_SSWU_RO_")
|
|
return P
|
|
|
|
S = [grouphash(b"z.cash:SinsemillaS", pack('<I', j)) for j in range(0, 1<<k)]
|
|
|
|
def pad(n, M):
|
|
assert n % k == 0
|
|
m = ""
|
|
for b in M:
|
|
m += format(as_byte(b), '08b')[::-1]
|
|
|
|
r = [int(m[i:i+k][::-1], 2) for i in range(0, n, k)]
|
|
return r
|
|
|
|
def sinsemilla_hash(D, m):
|
|
Acc = grouphash(b"z.cash:SinsemillaQ", D)
|
|
if VERBOSE: print(Acc)
|
|
for x in m:
|
|
Acc = (Acc + S[x]) + Acc
|
|
if VERBOSE: print(Acc)
|
|
|
|
return Acc
|
|
|
|
print(sinsemilla_hash(b"z.cash:test-Sinsemilla", pad(40, b"hello")))
|