27 lines
883 B
Python
27 lines
883 B
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 sapling_pedersen import pedersen_hash
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from utils import i2lebsp, leos2bsp
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MERKLE_DEPTH = 32
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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) == 255
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assert len(right) == 255
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l = i2lebsp(6, MERKLE_DEPTH - 1 - layer)
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return pedersen_hash(b'Zcash_PH', l + left + right)
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a = unhexlify('87a086ae7d2252d58729b30263fb7b66308bf94ef59a76c9c86e7ea016536505')[::-1]
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b = unhexlify('a75b84a125b2353da7e8d96ee2a15efe4de23df9601b9d9564ba59de57130406')[::-1]
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c = unhexlify('5bf43b5736c19b714d1f462c9d22ba3492c36e3d9bbd7ca24d94b440550aa561')[::-1]
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a = leos2bsp(a)[:255]
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b = leos2bsp(b)[:255]
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c = leos2bsp(c)[:255]
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assert merkle_crh(MERKLE_DEPTH - 1 - 25, a, b) == c
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assert merkle_crh(MERKLE_DEPTH - 1 - 26, a, b) != c
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