assembly 如何在程序集中读取ECDSA从签名中恢复公钥行？

x33g5p2x 于 2022-11-13 发布在其他

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我正在研究如何在etherscan中读取汇编中的ECDSA恢复输出

function tryRecover(bytes32 hash, bytes memory signature) internal pure returns (address, RecoverError) {
        // Check the signature length
        // - case 65: r,s,v signature (standard)
        // - case 64: r,vs signature (cf https://eips.ethereum.org/EIPS/eip-2098) _Available since v4.1._
        if (signature.length == 65) {
            bytes32 r;
            bytes32 s;
            uint8 v;
            // ecrecover takes the signature parameters, and the only way to get them
            // currently is to use assembly.
            /// @solidity memory-safe-assembly
            assembly {
                r := mload(add(signature, 0x20))
                s := mload(add(signature, 0x40))
                v := byte(0, mload(add(signature, 0x60)))
            }
            return tryRecover(hash, v, r, s);
        } else if (signature.length == 64) {
            bytes32 r;
            bytes32 vs;
            // ecrecover takes the signature parameters, and the only way to get them
            // currently is to use assembly.
            /// @solidity memory-safe-assembly
            assembly {
                r := mload(add(signature, 0x20))
                vs := mload(add(signature, 0x40))
            }
            return tryRecover(hash, r, vs);
        } else {
            return (address(0), RecoverError.InvalidSignatureLength);
        }
    }

有什么方法可以读取操作码来得到这个的输出吗？
先谢了

assembly

来源：https://stackoverflow.com/questions/73569529/how-to-read-lines-of-ecdsa-recover-public-key-from-signature-in-assembly

1条答案

按热度按时间

z3yyvxxp1#

此库可帮助您从ECDSA签名消息https://github.com/0xcyphered/secp256k1-solidity恢复公钥
示例：

//SPDX-License-Identifier: Unlicense
pragma solidity ^0.8.0;
import "@0xcyphered/secp256k1-solidity/contracts/SECP256K1.sol";
contract Example {
    function recoverPersonalSignPublicKey(
        bytes32 message,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) public pure returns (bytes memory) {
        string memory header = '\x19Ethereum Signed Message:\n32';
        bytes32 _message = keccak256(abi.encodePacked(header, message));
        (uint256 x, uint256 y) = SECP256K1.recover(uint256(_message), v - 27, uint256(r), uint256(s));
        return abi.encodePacked(x, y);
    }
}

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assembly 如何在程序集中读取ECDSA从签名中恢复公钥行？

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