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Added support for flatsigs

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This commit is contained in:
PedroCailleret
2023-05-22 07:43:47 -03:00
parent 26a495246e
commit 631c1d5dfb
32 changed files with 214 additions and 205 deletions
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37
contracts/lib/utils/ECDSA.sol
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@@ -15,26 +15,43 @@ library ECDSA {
0x7fffffffffffffffffffffffffffffff5d576e7357a4501ddfe92f46681b20a0;
/// @dev Recovers the signer's address from a message digest `hash`,
/// and the signature defined by `v`, `r`, `s`.
function recover(
/// and the `signature`.
///
/// This function does NOT accept EIP-2098 short form signatures.
/// Use `recover(bytes32 hash, bytes32 r, bytes32 vs)` for EIP-2098
/// short form signatures instead.
function recoverCalldata(
bytes32 hash,
uint8 v,
bytes32 r,
bytes32 s
bytes calldata signature
) internal view returns (address result) {
/// @solidity memory-safe-assembly
assembly {
// Copy the free memory pointer so that we can restore it later.
let m := mload(0x40)
// Directly copy `r` and `s` from the calldata.
calldatacopy(0x40, signature.offset, 0x40)
// Store the `hash` in the scratch space.
mstore(0x00, hash)
mstore(0x20, and(v, 0xff))
mstore(0x40, r)
mstore(0x60, s)
// Compute `v` and store it in the scratch space.
mstore(
0x20,
byte(
0,
calldataload(add(signature.offset, 0x40))
)
)
pop(
staticcall(
gas(), // Amount of gas left for the transaction.
// If `s` in lower half order, such that the signature is not malleable.
lt(s, add(_MALLEABILITY_THRESHOLD, 1)), // Address of `ecrecover`.
and(
// If the signature is exactly 65 bytes in length.
eq(signature.length, 65),
// If `s` in lower half order, such that the signature is not malleable.
lt(
mload(0x60),
add(_MALLEABILITY_THRESHOLD, 1)
)
), // Address of `ecrecover`.
0x00, // Start of input.
0x80, // Size of input.
0x00, // Start of output.