bls12-381: Add edge case signature #549
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circl was using nil DST while kilic is using RFC DST, standardise on RFC DST Signed-off-by: Jakub Sztandera <[email protected]>
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| func (p *G2Elt) Hash(msg []byte) kyber.Point { p.inner.Hash(msg, nil); return p } | ||
| var domainG2 = []byte("BLS_SIG_BLS12381G2_XMD:SHA-256_SSWU_RO_NUL_") | ||
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| func (p *G2Elt) Hash(msg []byte) kyber.Point { p.inner.Hash(msg, domainG2); return p } | ||
| func (p *G2Elt) Hash2(msg, dst []byte) kyber.Point { p.inner.Hash(msg, dst); return p } |
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I wonder if we really need Hash2 still in V4 if we make the Hash take a DST arg by default. Cc @K1li4nL
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Unless there are good reasons to have this flexibility I suppose we can get rid of Hash2() and have a default DST yes
| @@ -97,5 +97,7 @@ func (p *G1Elt) Mul(s kyber.Scalar, q kyber.Point) kyber.Point { | |||
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| func (p *G1Elt) IsInCorrectGroup() bool { return p.inner.IsOnG1() } | |||
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| func (p *G1Elt) Hash(msg []byte) kyber.Point { p.inner.Hash(msg, nil); return p } | |||
| var domainG1 = []byte("BLS_SIG_BLS12381G1_XMD:SHA-256_SSWU_RO_NUL_") | |||
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I wonder if the DST for the curves shouldn't be the ones as per RFC9380, and the BLS signature DST shouldn't be specified in the BLS and BDN packages rather.
Cc @K1li4nL as well.
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Ideally yes, this would allow us to include the RFC test vectors easily for these curves
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This was to match the behaviour of circl to kilic. If there is anything I can do here, please don't hesitate to let me know.
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With the current interface (I guess that is the change you discussed in the other thread), there is no way for the BLS package to specify the DST, otherwise I would have done it there.
This signature does not validate when using kilic@master Add it to tests to highlight the issue and prevent this implementation from updating to it. The issue appears in this commit: kilic/bls12-381@7536ae1 and is not related to assembly code (it reproduces even on M series macs) Signed-off-by: Jakub Sztandera <[email protected]>
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This signature does not validate when using kilic@master
Add it to tests to highlight the issue and prevent this implementation from updating to it.
It was detected in a live system.
The issue appears in this commit: kilic/bls12-381@7536ae1 and is not related to assembly code (it reproduces even on M series Macs).
Additionally, synchronise the default DST values between circl and kilic.