lucashenning

curl -X POST --data '{"jsonrpc":"2.0","method":"eth_sendTransaction","params”:[{  "from": "0xe0e30a6de5ad46c2dd0b8064da49cc65e40adf4e",  "to": "0xd46e8dd67c5d32be8058bb8eb970870f07244567",  "gas": "0x76c0", "gasPrice": "0x9184e72a000", "value": "0x9184e72a", "data": "0xd46e8dd67c5d32be8d46e8dd67c5d32be8058bb8eb970870f072445675058bb8eb970870f072445675"}],”id":1}' 172.31.34.23:8545

lucashenning

import { KMS } from 'aws-sdk';
import { keccak256 } from 'js-sha3';
import * as ethutil from 'ethereumjs-util';
import Web3 from 'web3';
import * as asn1 from 'asn1.js';
import BN from 'bn.js';
import { Transaction, TxData } from 'ethereumjs-tx';
import { TransactionReceipt } from 'web3-core/types';

const kms = new KMS({

lucashenning

function getEthereumAddress(publicKey: Buffer): string {
    console.log("Encoded Pub Key: " + publicKey.toString('hex'));

    // The public key is ASN1 encoded in a format according to 
    // https://tools.ietf.org/html/rfc5480#section-2
    // I used https://lapo.it/asn1js to figure out how to parse this 
    // and defined the schema in the EcdsaPubKey object
    let res = EcdsaPubKey.decode(publicKey, 'der');
    let pubKeyBuffer : Buffer = res.pubKey.data;
    console.log("Pub Key Buffer: " + pubKeyBuffer.toString('hex'));

lucashenning

async function calcEthSig(plaintext) {
    let signature = await sign(plaintext, keyId);
    if (signature.Signature == undefined) {
        throw new Error('Signature is undefined.');
    }
    console.log("encoded sig: " + signature.Signature.toString('hex'));

    let decoded = EcdsaSigAsnParse.decode(signature.Signature, 'der');
    let r : BN = decoded.r;
    let s : BN = decoded.s;

lucashenning

function recoverPubKeyFromSig(sig: Buffer, r : BN, s : BN, v: number) {
    console.log("Recovering public key with sig " + sig.toString('hex') + " r: " + r.toString(16) + " s: " + s.toString(16));
    let rBuffer = r.toBuffer();
    let sBuffer = s.toBuffer();
    let pubKey = ethutil.ecrecover(sig, v, rBuffer, sBuffer);
    let addrBuf = ethutil.pubToAddress(pubKey);
    var RecoveredEthAddr = ethutil.bufferToHex(addrBuf);
    console.log( "Recovered ethereum address: " +  RecoveredEthAddr);
    return RecoveredEthAddr;
}

lucashenning

import { KMS } from 'aws-sdk';
const kms = new KMS({
    accessKeyId: '<access_key_id>',
    secretAccessKey: '<access_secret>',
    region: 'us-east-1',
    apiVersion: '2014-11-01',
});
kms.getPublicKey({
    KeyId: '<KMS key id>'
});

lucashenning

const EcdsaPubKey = asn1.define('EcdsaPubKey', function(this: any) {
    // https://tools.ietf.org/html/rfc5480#section-2
    this.seq().obj(
        this.key('algo').seq().obj(
            this.key('algorithm').objid(),
            this.key('parameters').objid(),
        ),
        this.key('pubKey').bitstr() // <-- this is what we want
    );
});

lucashenning

async function sign(msgHash, keyId) {
    const params : KMS.SignRequest = {
        KeyId: keyId,
        Message: msgHash,
        SigningAlgorithm: 'ECDSA_SHA_256',
        MessageType: 'DIGEST'
    };
    return kms.sign(params).promise();
}

lucashenning

const EcdsaSigAsnParse = asn1.define('EcdsaSig', function(this: any) {
    this.seq().obj(
        this.key('r').int(),
        this.key('s').int(),
    );
});

lucashenning

pragma solidity ^0.5.0;

import "https://github.com/OpenZeppelin/openzeppelin-sdk/blob/v2.5.0/packages/lib/contracts/Initializable.sol";
import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v2.5.0/contracts/token/ERC721/ERC721.sol";
import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v2.5.0/contracts/token/ERC721/ERC721Enumerable.sol";
import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v2.5.0/contracts/token/ERC721/ERC721Metadata.sol";
import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v2.5.0/contracts/token/ERC721/ERC721MetadataMintable.sol";
import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v2.5.0/contracts/token/ERC721/ERC721Pausable.sol";