eth-typed-data
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A library to simplifiy interacting with and signing EIP712 typed data
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<a href="index.html">All files</a> verify.js
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<span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js">import { ec as EC } from 'elliptic'
import { keccak256 } from 'js-sha3'
import EIP712Domain from './Domain'
const secp256k1 = new EC('secp256k1')
/**
* Verify that a particular object was signed by a given
*/
export function verify(request, signature, address) {
const { domain, message } = EIP712Domain.fromSignatureRequest(request)
if (!message.verifySignature(signature, address)) {
throw new Error('Invalid signature for address over this object')
}
return { domain, message }
}
/**
* Verify a signed hash made by the owner of a particular ethereum address
* returning true if the signature is valid, and false otherwise
* @param {Buffer} data qq
* @param {Object} signature
* @param {String} address
* @returns {Boolean} indicator of the signature's validity
*/
export function verifyRawSignatureFromAddress(data, signature, address) {
const { r, s, v } = normalizeSignature(signature)
// Recover public key from signature, and convert to ethereum address
const publicKey = secp256k1.recoverPubKey(data, {r, s}, v).encode('hex')
const recoveredAddress = toEthereumAddress(publicKey)
return recoveredAddress === address
}
/**
* Convert a hex encoded secp256k1 public key to the equivalent ethereum address
* @param {String} hexPublicKey
* @returns {String} address of account with given public key
*/
export function toEthereumAddress(hexPublicKey) {
hexPublicKey = hexPublicKey.startsWith('0x') ? hexPublicKey.slice(2) : hexPublicKey
return `0x${keccak256(Buffer.from(hexPublicKey, 'hex')).slice(-20).toString('hex')}`
}
/**
* Convert a string, or buffer signature to an object containing
* the three signature parameters r, s, v
* @param {String|Object} sig
* @returns {Object} A normalized signature object, containing strings r,s,v
*/
function normalizeSignature(sig) {
// Parse string into buffer
if (typeof sig === 'string') {
sig = {
r: Buffer.from(sig.slice(0, 64), 'hex'),
s: Buffer.from(sig.slice(64, 128), 'hex'),
v: parseInt(sig[128])
}
}
return {
r: sig.r,
s: sig.s,
v: 'recoveryParam' in sig ? sig.recoveryParam : sig.v,
}
}</pre></td></tr>
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