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Avoid assembly in signature V and S decomposition (#3060)

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* Avoid assembly in signature V and S decomposition

* Update ECDSA.sol
This commit is contained in:
Anton Bukov
2021-12-29 18:22:39 +03:00
committed by GitHub
parent e3391cd65f
commit da3a9ae18b
1 changed files with 2 additions and 6 deletions
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8
contracts/utils/cryptography/ECDSA.sol
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@ -117,12 +117,8 @@ library ECDSA {
bytes32 r,
bytes32 vs
) internal pure returns (address, RecoverError) {
bytes32 s;
uint8 v;
assembly {
s := and(vs, 0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff)
v := add(shr(255, vs), 27)
}
bytes32 s = vs & bytes32(0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff);
uint8 v = uint8((uint256(vs) >> 255) + 27);
return tryRecover(hash, v, r, s);
}