ilp-protocol-stream/dist/src/util/receipt.js

Interledger Transport Protocol for sending multiple streams of money and data over ILP.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.verifyReceipt = exports.decodeReceipt = exports.createReceipt = exports.RECEIPT_VERSION = void 0;
const oer_utils_1 = require("oer-utils");
const long_1 = require("./long");
const crypto_1 = require("../crypto");
exports.RECEIPT_VERSION = 1;
function createReceipt(opts) {
    if (opts.nonce.length !== 16) {
        throw new Error('receipt nonce must be 16 bytes');
    }
    if (opts.secret.length !== 32) {
        throw new Error('receipt secret must be 32 bytes');
    }
    const receipt = new oer_utils_1.Writer(58);
    receipt.writeUInt8(exports.RECEIPT_VERSION);
    receipt.writeOctetString(opts.nonce, 16);
    receipt.writeUInt8(opts.streamId);
    receipt.writeUInt64((0, long_1.longFromValue)(opts.totalReceived, true));
    receipt.writeOctetString((0, crypto_1.generateReceiptHMAC)(opts.secret, receipt.getBuffer()), 32);
    return receipt.getBuffer();
}
exports.createReceipt = createReceipt;
function decode(receipt) {
    if (receipt.length !== 58) {
        throw new Error('receipt malformed');
    }
    const reader = oer_utils_1.Reader.from(receipt);
    const version = reader.readUInt8Number();
    const nonce = reader.readOctetString(16);
    const streamId = reader.readUInt8();
    const totalReceived = reader.readUInt64Long();
    const hmac = reader.readOctetString(32);
    return {
        version,
        nonce,
        streamId,
        totalReceived,
        hmac,
    };
}
function decodeReceipt(receipt) {
    return decode(receipt);
}
exports.decodeReceipt = decodeReceipt;
function verifyReceipt(receipt, secret) {
    const decoded = decode(receipt);
    if (decoded.version !== exports.RECEIPT_VERSION) {
        throw new Error('invalid version');
    }
    if (typeof secret === 'function') {
        secret = secret(decoded);
    }
    const message = receipt.slice(0, 26);
    if (!decoded.hmac.equals((0, crypto_1.generateReceiptHMAC)(secret, message))) {
        throw new Error('invalid hmac');
    }
    return decoded;
}
exports.verifyReceipt = verifyReceipt;
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