24 lines
646 B
Python
24 lines
646 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 pyblake2 import blake2s
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from sapling_pedersen import (
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mixing_pedersen_hash,
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windowed_pedersen_commitment,
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)
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from utils import i2lebsp
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def note_commit(rcm, g_d, pk_d, v):
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return windowed_pedersen_commitment(rcm, [1] * 6 + i2lebsp(64, v) + g_d + pk_d)
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def prf_nf_sapling(nk_star, rho_star):
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digest = blake2s(person=b'Zcash_nf')
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digest.update(nk_star)
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digest.update(rho_star)
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return digest.digest()
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def note_nullifier(nk, cm, pos):
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rho = mixing_pedersen_hash(cm, pos)
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return prf_nf_sapling(bytes(nk), bytes(rho))
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