33 lines
1.1 KiB
Python
33 lines
1.1 KiB
Python
#!/usr/bin/env python3
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import sys; assert sys.version_info[0] >= 3, "Python 3 required."
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from binascii import unhexlify
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from orchard_pallas import Fp
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from orchard_sinsemilla import sinsemilla_hash
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from utils import i2lebsp, leos2bsp
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# https://zips.z.cash/protocol/nu5.pdf#constants
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MERKLE_DEPTH = 32
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L_MERKLE = 255
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# https://zips.z.cash/protocol/nu5.pdf#orchardmerklecrh
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def merkle_crh(layer, left, right):
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assert layer < MERKLE_DEPTH
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assert len(left) == L_MERKLE
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assert len(right) == L_MERKLE
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l = i2lebsp(10, MERKLE_DEPTH - 1 - layer)
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return sinsemilla_hash(b"z.cash:Orchard-MerkleCRH", l + left + right)
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left = unhexlify("87a086ae7d2252d58729b30263fb7b66308bf94ef59a76c9c86e7ea016536505")[::-1]
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right = unhexlify("a75b84a125b2353da7e8d96ee2a15efe4de23df9601b9d9564ba59de57130406")[::-1]
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left = leos2bsp(left)[:L_MERKLE]
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right = leos2bsp(right)[:L_MERKLE]
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# parent = merkle_crh(MERKLE_DEPTH - 1 - 25, left, right)
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parent = Fp(626278560043615083774572461435172561667439770708282630516615972307985967801)
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assert merkle_crh(MERKLE_DEPTH - 1 - 25, left, right) == parent
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assert merkle_crh(MERKLE_DEPTH - 1 - 26, left, right) != parent
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