I have this function in a contract:
address signer = <an address>
function foo(
uint a,
address b,
uint8 v,
bytes32 r,
bytes32 s
) external {
require(
ecrecover(
keccak256(abi.encodePacked(a, b)),
v,
r,
s
) == signer
);
}
The is a possibility to create signature without the signer PK to satisfice this function?
Do you know any list of typical errors with ecrecover?