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vkobel/EcRecover.sol

Created July 6, 2017 13:40
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Ethereum Solidity - example contract that shows how to use the ecrecover function to works along with eth_sign
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EcRecover.sol
pragma solidity ^0.4.11;
contract EcRecover {
function verify(bytes32 hash, uint8 v, bytes32 r, bytes32 s) returns (address) {
bytes32 prefixedHash = sha3("\x19Ethereum Signed Message:\n32", hash);
return ecrecover(prefixedHash, v, r, s);
}
}
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vkobel commented Jul 6, 2017

The trick is that eth_sign is prefixing its hash with the string "\x19Ethereum Signed Message:\n32".
32 is the length of the hash (fixed in this case).

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