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orchard_group_hash.py: don't apply iso_map as part of map_to_curve_simple_swu. 

Signed-off-by: Daira Hopwood <daira@jacaranda.org>
This commit is contained in:
Daira Hopwood 2021-04-27 14:26:12 +01:00
parent 86c2796de8
commit 322aff1777
1 changed files with 2 additions and 2 deletions
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orchard_group_hash.py
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@ -122,7 +122,7 @@ def map_to_curve_simple_swu(u):
y = y if e3 else -y #y = CMOV(-y, y, e3)
return orchard_iso_pallas.Point(x, y).iso_map()
return orchard_iso_pallas.Point(x, y)
def group_hash(d, m):
dst = d + b"-" + b"pallas" + b"_XMD:BLAKE2b_SSWU_RO_"
@ -130,7 +130,7 @@ def group_hash(d, m):
elems = hash_to_field(m, dst)
assert len(elems) == 2
q = [map_to_curve_simple_swu(elems[0]), map_to_curve_simple_swu(elems[1])]
q = [map_to_curve_simple_swu(elems[0]).iso_map(), map_to_curve_simple_swu(elems[1]).iso_map()]
return q[0] + q[1]