Our original wrapper code had two parts. One taken from a third
party repository (who took it from upstream Go) licensed under
BSD-3. The second written by Jeff, Felix and Gustav, licensed
under LGPL. This made this package problematic to use from the
outside.
With the agreement of the original copyright holders, this commit
changes the license of the LGPL portions of the code to BSD-3:
---
I agree changing from LGPL to a BSD style license.
Jeff
---
Hey guys,
My preference would be to relicense to GNUBL, but I'm also OK with BSD.
Cheers,
Gustav
---
Felix Lange (fjl):
I would approve anything that makes our licensing less complicated
---
ToECDSAPub was unsafe because it returned a non-nil key with nil X, Y in
case of invalid input. This change replaces ToECDSAPub with
UnmarshalPubkey across the codebase.
* crypto/bn256: full switchover to cloudflare's code
* crypto/bn256: only use cloudflare for optimized architectures
* crypto/bn256: upstream fallback for non-optimized code
* .travis, build: drop support for Go 1.8 (need type aliases)
* crypto/bn256/cloudflare: enable curve mul lattice optimization
* core/vm, crypto/bn256: switch over to cloudflare library
* crypto/bn256: unmarshal constraint + start pure go impl
* crypto/bn256: combo cloudflare and google lib
* travis: drop 386 test job
* crypto: ensure that VerifySignature rejects malleable signatures
It already rejected them when using libsecp256k1, make sure the nocgo
version does the same thing.
* crypto: simplify check
* crypto: fix build
With this change,
key, err := crypto.HexToECDSA("000000...")
returns nil key and an error instead of a non-nil key with nil X
and Y inside. Issue found by @guidovranken.
We need those operations for p2p/enr.
Also upgrade github.com/btcsuite/btcd/btcec to the latest version
and improve BenchmarkSha3. The benchmark printed extra output
that confused tools like benchstat and ignored N.
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.
