@fordefi-public/crypto-address-validator-ts
Version:
Crypto address validator for Bitcoin and other Altcoins, forked to be used with typescript
27 lines • 1.02 kB
JavaScript
import * as sha3 from 'js-sha3';
export function isValidAddress(address) {
if (!/^0x[0-9a-fA-F]{40}$/.test(address)) {
// Check if it has the basic requirements of an address
return false;
}
if (/^0x[0-9a-f]{40}$/.test(address) || /^0x?[0-9A-F]{40}$/.test(address)) {
// If it's all small caps or all all caps, return true
return true;
}
// Otherwise check each case
return verifyChecksum(address);
}
function verifyChecksum(address) {
// Check each case
address = address.replace('0x', '');
var addressHash = sha3.keccak256(address.toLowerCase());
for (var i = 0; i < 40; i++) {
// The nth letter should be uppercase if the nth digit of casemap is 1
if ((parseInt(addressHash[i], 16) > 7 && address[i].toUpperCase() !== address[i]) ||
(parseInt(addressHash[i], 16) <= 7 && address[i].toLowerCase() !== address[i])) {
return false;
}
}
return true;
}
//# sourceMappingURL=ethereum_validator.js.map