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• .. (вверх)
• [DIR] ..
• [FILE] attestation.d.ts
• [FILE] attestation.d.ts.map
• [FILE] attestation.js
• [FILE] index.d.ts
• [FILE] index.d.ts.map
• [FILE] index.js
• [FILE] parsePayGoAttestation.d.ts
• [FILE] parsePayGoAttestation.d.ts.map
• [FILE] parsePayGoAttestation.js
• [DIR] psbt

Просмотр файла: parsePayGoAttestation.js

"use strict";
var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.Prefix = void 0;
exports.parsePayGoAttestation = parsePayGoAttestation;
const assert_1 = __importDefault(require("assert"));
const utxo_lib_1 = require("@bitgo/utxo-lib");
// The signed address will always have the following structure:
// 0x18Bitcoin Signed Message:\n<varint_length><ENTROPY><ADDRESS><UUID>
exports.Prefix = Buffer.from('\u0018Bitcoin Signed Message:\n', 'utf-8');
// UUID has the structure 00000000-0000-0000-0000-000000000000, and after
// we Buffer.from and get it's length its 36.
const UuidBufferLength = 36;
// The entropy will always be 64 bytes
const EntropyLen = 64;
/**
 * This function takes in the attestation proof of a PayGo address of the from
 * <varint_length><ENTROPY><ADDRESS><UUID> and returns
 * the address given its length. It is assumed that the ENTROPY is 64 bytes in the Buffer
 * so if not given an address proof length we can still extract the address from the proof.
 *
 * @param message
 * @param adressProofLength
 */
function parsePayGoAttestation(message) {
    if (message.length <= EntropyLen + UuidBufferLength) {
        throw new Error('PayGo attestation proof is too short to contain a valid address');
    }
    // This generates the first part before the varint length so that we can
    // determine how many bytes this is and iterate through the Buffer.
    let offset = 0;
    if (message.toString('hex').startsWith(exports.Prefix.toString('hex'))) {
        offset = exports.Prefix.length;
    }
    // we decode the varint of the message which is uint32
    // https://en.bitcoin.it/wiki/Protocol_documentation
    const varInt = utxo_lib_1.bufferutils.varuint.decode(message, offset);
    (0, assert_1.default)(varInt);
    offset += utxo_lib_1.bufferutils.varuint.decode.bytes;
    const entropy = message.subarray(offset, offset + EntropyLen);
    offset += EntropyLen;
    const address = message.subarray(offset, message.length - UuidBufferLength);
    offset += address.length;
    const uuid = message.subarray(message.length - UuidBufferLength);
    // we break up the original message and retuen the entropy, address and uuid in their buffers
    return { entropy, address, uuid };
}
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