Validate TRON address using solidity ecrecover - ethereum

Question

I'm trying to validate a signed message using a smart contract running on the TRON network.
I've tried a few different methods but all failed:
Based on this article I've deployed the following smart contract:
contract Verifier {
function recoverAddr(bytes32 msgHash, uint8 v, bytes32 r, bytes32 s) returns (address) {
return ecrecover(msgHash, v, r, s);
}
function isSigned(address _addr, bytes32 msgHash, uint8 v, bytes32 r, bytes32 s) returns (bool) {
return ecrecover(msgHash, v, r, s) == _addr;
}
}
And the following client (js) code:
let contract = await tronWeb.contract().at(contract_address);
let msg = tronWeb.sha3('This is my message');
let signature = await tronWeb.trx.sign(msg);
var r = signature.substr(0, 66);
var s = "0x" + signature.substr(66, 64);
var v = "0x" + signature.substr(signature.length - 2);
let hexAddress = await contract.recoverAddr(msg, v, r, s).call();
But got back a wrong address.
Based on this article I've deployed the following smart contract:
contract Verifier {
//return the address according to the signature and and the data
function validate(bytes32 hash, bytes signature)
public
pure
returns (address){
bytes memory signedString = signature;
bytes32 r = convertToBytes32(slice(signedString, 0, 32));
bytes32 s = convertToBytes32(slice(signedString, 32, 32));
byte v1 = slice(signedString, 64, 1)[0];
uint8 v = uint8(v1) + 27;
return ecrecover(hash, uint8(r), s, bytes32(v));
}
//slice function
function slice(bytes memory data, uint start, uint len)
private
pure
returns (bytes){
bytes memory b = new bytes(len);
for(uint i = 0; i < len; i++){
b[i] = data[i + start];
}
return b;
}
//convert bytes to bytes32
function convertToBytes32(bytes memory source)
private
pure
returns (bytes32 result) {
assembly {
result := mload(add(source, 32))
}
}
}
And the following client (js) code:
let contract = await tronWeb.contract().at(contract_address);
let msg = tronWeb.sha3('Hello World');
let signature = await tronWeb.trx.sign(msg);
let hexAddress = await contract.validate(msg, signature).call();
Still got back a wrong address.
I managed to sign and recover an address using pure js code based on this:
const ethers = tronWeb.utils.ethersUtils;
let signingKey = new ethers.SigningKey(tronWeb.defaultPrivateKey);
let message = "This is some message";
let messageBytes = ethers.toUtf8Bytes(message);
let messageDigest = ethers.keccak256(messageBytes);
let signature = signingKey.signDigest(messageDigest);
let recovered = ethers.recoverAddress(messageDigest, signature);
console.log("Recovered address: " + recovered);
How can I sign a message using a js code and recover using a smart contract? What am I missing?

Answer 1

I got it.
The smart contract code:
contract Verifier {
function recoverAddr(bytes32 msgHash, uint8 v, bytes32 r, bytes32 s) returns (address) {
return ecrecover(msgHash, v, r, s);
}
function isSigned(address _addr, bytes32 msgHash, uint8 v, bytes32 r, bytes32 s) returns (bool) {
return ecrecover(msgHash, v, r, s) == _addr;
}
}
The client code:
const ethers = tronWeb.utils.ethersUtils;
let contract = await tronWeb.contract().at(contract_address);
let signingKey = new ethers.SigningKey(tronWeb.defaultPrivateKey);
let message = "This is some message";
let messageBytes = ethers.toUtf8Bytes(message);
let messageDigest = ethers.keccak256(messageBytes);
let signature = signingKey.signDigest(messageDigest);
let hexAddress = await contract.recoverAddr(messageDigest, signature.v, signature.r, signature.s).call();