"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
exports.SignedCertificateTimestamp = void 0;
/*
Copyright 2023 The Sigstore Authors.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
const crypto = __importStar(require("../crypto"));
const stream_1 = require("../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) {
            /* istanbul ignore next */
            case 0:
                return 'none';
            /* istanbul ignore next */
            case 1:
                return 'md5';
            /* istanbul ignore next */
            case 2:
                return 'sha1';
            /* istanbul ignore next */
            case 3:
                return 'sha224';
            case 4:
                return 'sha256';
            /* istanbul ignore next */
            case 5:
                return 'sha384';
            /* istanbul ignore next */
            case 6:
                return 'sha512';
            /* istanbul ignore next */
            default:
                return 'unknown';
        }
    }
    verify(preCert, key) {
        // 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);
        /* istanbul ignore next - extensions are very uncommon */
        if (this.extensions.byteLength > 0) {
            stream.appendView(this.extensions);
        }
        return crypto.verify(stream.buffer, key, 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;
