@polkadot/util-crypto/cjs/address/checksum.js

A collection of useful crypto utilities for @polkadot

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.checkAddressChecksum = checkAddressChecksum;
const sshash_js_1 = require("./sshash.js");
function checkAddressChecksum(decoded) {
    const ss58Length = (decoded[0] & 0b0100_0000) ? 2 : 1;
    const ss58Decoded = ss58Length === 1
        ? decoded[0]
        : ((decoded[0] & 0b0011_1111) << 2) | (decoded[1] >> 6) | ((decoded[1] & 0b0011_1111) << 8);
    // 32/33 bytes public + 2 bytes checksum + prefix
    const isPublicKey = [34 + ss58Length, 35 + ss58Length].includes(decoded.length);
    const length = decoded.length - (isPublicKey ? 2 : 1);
    // calculate the hash and do the checksum byte checks
    const hash = (0, sshash_js_1.sshash)(decoded.subarray(0, length));
    const isValid = (decoded[0] & 0b1000_0000) === 0 && ![46, 47].includes(decoded[0]) && (isPublicKey
        ? decoded[decoded.length - 2] === hash[0] && decoded[decoded.length - 1] === hash[1]
        : decoded[decoded.length - 1] === hash[0]);
    return [isValid, length, ss58Length, ss58Decoded];
}