27 lines
965 B
Solidity
27 lines
965 B
Solidity
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// SPDX-License-Identifier: MIT
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pragma solidity ^0.8.20;
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/**
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* From https://github.com/Uniswap/permit2/blob/main/src/libraries/SignatureVerification.sol
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*/
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library ParseSignature {
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/// @notice Thrown when the passed in signature is not a valid length
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error InvalidSignatureLength();
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bytes32 constant UPPER_BIT_MASK = (0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff);
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function parse(bytes calldata signature) public pure returns (uint8 v, bytes32 r, bytes32 s) {
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if (signature.length == 65) {
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(r, s) = abi.decode(signature, (bytes32, bytes32));
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v = uint8(signature[64]);
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} else if (signature.length == 64) {
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// EIP-2098
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bytes32 vs;
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(r, vs) = abi.decode(signature, (bytes32, bytes32));
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s = vs & UPPER_BIT_MASK;
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v = uint8(uint256(vs >> 255)) + 27;
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} else {
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revert InvalidSignatureLength();
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}
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}
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}
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