1#@!#!123s

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Filename : sct.js
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"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.SignedCertificateTimestamp = void 0;
const util_1 = require("../util");
const stream_1 = require("../util/stream");
class SignedCertificateTimestamp {
    constructor(options) {
        this.version = options.version;
        this.logID = options.logID;
        this.timestamp = options.timestamp;
        this.extensions = options.extensions;
        this.hashAlgorithm = options.hashAlgorithm;
        this.signatureAlgorithm = options.signatureAlgorithm;
        this.signature = options.signature;
    }
    get datetime() {
        return new Date(Number(this.timestamp.readBigInt64BE()));
    }
    // Returns the hash algorithm used to generate the SCT's signature.
    // https://www.rfc-editor.org/rfc/rfc5246#section-7.4.1.4.1
    get algorithm() {
        switch (this.hashAlgorithm) {
            case 0:
                return 'none';
            case 1:
                return 'md5';
            case 2:
                return 'sha1';
            case 3:
                return 'sha224';
            case 4:
                return 'sha256';
            case 5:
                return 'sha384';
            case 6:
                return 'sha512';
            default:
                return 'unknown';
        }
    }
    verify(preCert, logs) {
        // Find key for the log reponsible for this signature
        const log = logs.find((log) => log.logId?.keyId.equals(this.logID));
        if (!log?.publicKey?.rawBytes) {
            throw new Error(`No key found for log: ${this.logID.toString('base64')}`);
        }
        const publicKey = util_1.crypto.createPublicKey(log.publicKey.rawBytes);
        // Assemble the digitally-signed struct (the data over which the signature
        // was generated).
        // https://www.rfc-editor.org/rfc/rfc6962#section-3.2
        const stream = new stream_1.ByteStream();
        stream.appendChar(this.version);
        stream.appendChar(0x00); // SignatureType = certificate_timestamp(0)
        stream.appendView(this.timestamp);
        stream.appendUint16(0x01); // LogEntryType = precert_entry(1)
        stream.appendView(preCert);
        stream.appendUint16(this.extensions.byteLength);
        if (this.extensions.byteLength > 0) {
            stream.appendView(this.extensions);
        }
        return util_1.crypto.verifyBlob(stream.buffer, publicKey, this.signature, this.algorithm);
    }
    // Parses a SignedCertificateTimestamp from a buffer. SCTs are encoded using
    // TLS encoding which means the fields and lengths of most fields are
    // specified as part of the SCT and TLS specs.
    // https://www.rfc-editor.org/rfc/rfc6962#section-3.2
    // https://www.rfc-editor.org/rfc/rfc5246#section-7.4.1.4.1
    static parse(buf) {
        const stream = new stream_1.ByteStream(buf);
        // Version - enum { v1(0), (255) }
        const version = stream.getUint8();
        // Log ID  - struct { opaque key_id[32]; }
        const logID = stream.getBlock(32);
        // Timestamp - uint64
        const timestamp = stream.getBlock(8);
        // Extensions - opaque extensions<0..2^16-1>;
        const extenstionLength = stream.getUint16();
        const extensions = stream.getBlock(extenstionLength);
        // Hash algo - enum { sha256(4), . . . (255) }
        const hashAlgorithm = stream.getUint8();
        // Signature algo - enum { anonymous(0), rsa(1), dsa(2), ecdsa(3), (255) }
        const signatureAlgorithm = stream.getUint8();
        // Signature  - opaque signature<0..2^16-1>;
        const sigLength = stream.getUint16();
        const signature = stream.getBlock(sigLength);
        // Check that we read the entire buffer
        if (stream.position !== buf.length) {
            throw new Error('SCT buffer length mismatch');
        }
        return new SignedCertificateTimestamp({
            version,
            logID,
            timestamp,
            extensions,
            hashAlgorithm,
            signatureAlgorithm,
            signature,
        });
    }
}
exports.SignedCertificateTimestamp = SignedCertificateTimestamp;