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Fix #320 

* Avoids unnecessary hashing of `message`
* Makes the ordering of arguments (`message` followed by `domain`) consistent with usage order
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Justin 2019-01-10 11:52:21 +00:00 committed by GitHub
parent d5fdeac6e8
commit 3476b02ffa
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1 changed files with 2 additions and 2 deletions
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specs/bls_signature.md
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@ -71,8 +71,8 @@ q = 4002409555221667393417789825735904156556882819939007885332058136124031650490
def hash_to_G2(message: bytes32, domain: uint64) -> [uint384]: def hash_to_G2(message: bytes32, domain: uint64) -> [uint384]:
# Initial candidate x coordinate # Initial candidate x coordinate
x_re = int.from_bytes(hash(bytes8(domain) + b'\x01' + message), 'big') x_re = int.from_bytes(hash(message + bytes8(domain) + b'\x01'), 'big')
x_im = int.from_bytes(hash(bytes8(domain) + b'\x02' + message), 'big') x_im = int.from_bytes(hash(message + bytes8(domain) + b'\x02'), 'big')
x_coordinate = Fq2([x_re, x_im]) # x = x_re + i * x_im x_coordinate = Fq2([x_re, x_im]) # x = x_re + i * x_im
# Test candidate y coordinates until a one is found # Test candidate y coordinates until a one is found