safe-react/safe-contracts/build/contracts/SignatureDecoder.json

{
  "contractName": "SignatureDecoder",
  "abi": [],
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  "source": "pragma solidity 0.4.24;\n\n\n/// @title SignatureDecoder - Decodes signatures that a encoded as bytes\n/// @author Ricardo Guilherme Schmidt (Status Research & Development GmbH) \n/// @author Richard Meissner - <richard@gnosis.pm>\ncontract SignatureDecoder {\n    \n    /// @dev Recovers address who signed the message \n    /// @param messageHash operation ethereum signed message hash\n    /// @param messageSignature message `txHash` signature\n    /// @param pos which signature to read\n    function recoverKey (\n        bytes32 messageHash, \n        bytes messageSignature,\n        uint256 pos\n    )\n        internal\n        pure\n        returns (address) \n    {\n        uint8 v;\n        bytes32 r;\n        bytes32 s;\n        (v, r, s) = signatureSplit(messageSignature, pos);\n        return ecrecover(messageHash, v, r, s);\n    }\n\n    /// @dev divides bytes signature into `uint8 v, bytes32 r, bytes32 s`\n    /// @param pos which signature to read\n    /// @param signatures concatenated rsv signatures\n    function signatureSplit(bytes signatures, uint256 pos)\n        internal\n        pure\n        returns (uint8 v, bytes32 r, bytes32 s)\n    {\n        // The signature format is a compact form of:\n        //   {bytes32 r}{bytes32 s}{uint8 v}\n        // Compact means, uint8 is not padded to 32 bytes.\n        // solium-disable-next-line security/no-inline-assembly\n        assembly {\n            let signaturePos := mul(0x41, pos)\n            r := mload(add(signatures, add(signaturePos, 0x20)))\n            s := mload(add(signatures, add(signaturePos, 0x40)))\n            // Here we are loading the last 32 bytes, including 31 bytes\n            // of 's'. There is no 'mload8' to do this.\n            //\n            // 'byte' is not working due to the Solidity parser, so lets\n            // use the second best option, 'and'\n            v := and(mload(add(signatures, add(signaturePos, 0x41))), 0xff)\n        }\n    }\n}\n",
  "sourcePath": "/Users/apanizo/git/gnosis/safe-contracts/contracts/common/SignatureDecoder.sol",
  "ast": {
    "absolutePath": "/Users/apanizo/git/gnosis/safe-contracts/contracts/common/SignatureDecoder.sol",
    "exportedSymbols": {
      "SignatureDecoder": [
        1791
      ]
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        "documentation": "@title SignatureDecoder - Decodes signatures that a encoded as bytes\n @author Ricardo Guilherme Schmidt (Status Research & Development GmbH) \n @author Richard Meissner - <richard@gnosis.pm>",
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                    "typeIdentifier": "t_bytes32",
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                  },
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              ],
              "src": "1103:31:12"
            },
            "scope": 1791,
            "src": "1002:914:12",
            "stateMutability": "pure",
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        ],
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  "compiler": {
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  "networks": {},
  "schemaVersion": "2.0.0",
  "updatedAt": "2018-10-05T14:25:58.938Z"
}