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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| 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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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).