import { SignatureType } from '@0x/types';
import * as ethUtil from 'ethereumjs-util';
export const signingUtils = {
signMessage(message: Buffer, privateKey: Buffer, signatureType: SignatureType): Buffer {
if (signatureType === SignatureType.EthSign) {
const prefixedMessage = ethUtil.hashPersonalMessage(message);
const ecSignature = ethUtil.ecsign(prefixedMessage, privateKey);
const signature = Buffer.concat([
ethUtil.toBuffer(ecSignature.v),
ecSignature.r,
ecSignature.s,
ethUtil.toBuffer(signatureType),
]);
return signature;
} else if (signatureType === SignatureType.EIP712) {
const ecSignature = ethUtil.ecsign(message, privateKey);
const signature = Buffer.concat([
ethUtil.toBuffer(ecSignature.v),
ecSignature.r,
ecSignature.s,
ethUtil.toBuffer(signatureType),
]);
return signature;
} else {
throw new Error(`${signatureType} is not a valid signature type`);
}
},
};
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