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crypto/bn256: fix generator on G1 (#15591)

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Generator in the current lib uses -2 as the y point when doing
ScalarBaseMult, this makes it so that points/signatures generated
from libs like py_ecc don't match/validate as pretty much all
other libs (including libsnark) have (1, 2) as the standard
generator.

This does not affect consensus as the generator is never used in
the VM, points are always explicitly defined and there is not
ScalarBaseMult op - it only makes it so that doing "import
github.com/ethereum/go-ethereum/crypto/bn256" doesn't generate
bad points in userland tools.
This commit is contained in:
Matthew Di Ferrante 2017-12-01 12:03:39 +00:00 committed by Felix Lange
parent d927c67f9d
commit 80c6dfc19f
1 changed files with 1 additions and 1 deletions
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2
crypto/bn256/curve.go
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@ -20,7 +20,7 @@ var curveB = new(big.Int).SetInt64(3)
// curveGen is the generator of G₁. // curveGen is the generator of G₁.
var curveGen = &curvePoint{ var curveGen = &curvePoint{
new(big.Int).SetInt64(1), new(big.Int).SetInt64(1),
new(big.Int).SetInt64(-2), new(big.Int).SetInt64(2),
new(big.Int).SetInt64(1), new(big.Int).SetInt64(1),
new(big.Int).SetInt64(1), new(big.Int).SetInt64(1),
} }