thor-devkit
Version:
Typescript library to aid DApp development on VeChain Thor
50 lines • 3.33 kB
JavaScript
import { keccak256 } from './keccak';
/** address related utilities */
export var address;
(function (address) {
/**
* derive Address from public key, note that the public key is uncompressed
* @param pub the public key
*/
function fromPublicKey(pub) {
return '0x' + keccak256(pub.slice(1)).slice(12).toString('hex');
}
address.fromPublicKey = fromPublicKey;
/**
* to check if a value presents an address
* @param v the value to be checked
*/
function test(v) {
return typeof v === 'string' && /^0x[0-9a-f]{40}$/i.test(v);
}
address.test = test;
/**
* encode the address to checksumed address that is compatible with eip-55
* @param address input address
*/
function toChecksumed(addr) {
if (!test(addr)) {
throw new Error('invalid address');
}
addr = addr.slice(2).toLowerCase();
const hash = keccak256(addr);
let checksumed = '0x';
for (let i = 0; i < addr.length; i++) {
// tslint:disable-next-line:no-bitwise
let byte = hash[i >> 1];
if (i % 2 === 0) {
// tslint:disable-next-line:no-bitwise
byte >>= 4;
}
if (byte % 16 >= 8) {
checksumed += addr[i].toUpperCase();
}
else {
checksumed += addr[i];
}
}
return checksumed;
}
address.toChecksumed = toChecksumed;
})(address || (address = {}));
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