trezor-address-validator/src/ripple_validator.js

Multicoin address validator for Bitcoin and other altcoins.

const { addressType } = require('../src/crypto/utils');
var cryptoUtils = require('./crypto/utils');
var baseX = require('base-x');

var ALLOWED_CHARS = 'rpshnaf39wBUDNEGHJKLM4PQRST7VWXYZ2bcdeCg65jkm8oFqi1tuvAxyz';

var codec = baseX(ALLOWED_CHARS);
var regexp = new RegExp('^r[' + ALLOWED_CHARS + ']{27,35}$');

module.exports = {
    /**
     * ripple address validation
     */
    isValidAddress: function (address) {
        if (regexp.test(address)) {
            return this.verifyChecksum(address);
        }

        return false;
    },

    verifyChecksum: function (address) {
        var bytes = codec.decode(address);
        var computedChecksum = cryptoUtils.sha256Checksum(cryptoUtils.toHex(bytes.slice(0, -4)));
        var checksum = cryptoUtils.toHex(bytes.slice(-4));

        return computedChecksum === checksum
    },

    getAddressType: function (address, currency, networkType) {
        if (this.isValidAddress(address, currency, networkType)) {
            return addressType.ADDRESS;
        }
        return undefined;
    },
};