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Viewing file:     set.js (2.99 KB)      -rw-r--r--

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.verifyTLogSET = void 0;
const util_1 = require("../../util");
// Verifies the SET for the given entry against the list of trusted
// transparency logs. Returns true if the SET can be verified against at least
// one of the trusted logs; otherwise, returns false.
function verifyTLogSET(entry, tlogs) {
    // Filter the list of tlog instances to only those which might be able to
    // verify the SET
    const validTLogs = filterTLogInstances(tlogs, entry.logId.keyId, entry.integratedTime);
    // Check to see if we can verify the SET against any of the valid tlogs
    return validTLogs.some((tlog) => {
        if (!tlog.publicKey?.rawBytes) {
            return false;
        }
        const publicKey = util_1.crypto.createPublicKey(tlog.publicKey.rawBytes);
        // Re-create the original Rekor verification payload
        const payload = toVerificationPayload(entry);
        // Canonicalize the payload and turn into a buffer for verification
        const data = Buffer.from(util_1.json.canonicalize(payload), 'utf8');
        // Extract the SET from the tlog entry
        const signature = entry.inclusionPromise.signedEntryTimestamp;
        return util_1.crypto.verifyBlob(data, publicKey, signature);
    });
}
exports.verifyTLogSET = verifyTLogSET;
// Returns a properly formatted "VerificationPayload" for one of the
// transaction log entires in the given bundle which can be used for SET
// verification.
function toVerificationPayload(entry) {
    const { integratedTime, logIndex, logId, canonicalizedBody } = entry;
    return {
        body: canonicalizedBody.toString('base64'),
        integratedTime: Number(integratedTime),
        logIndex: Number(logIndex),
        logID: logId.keyId.toString('hex'),
    };
}
// Filter the list of tlog instances to only those which match the given log
// ID and have public keys which are valid for the given integrated time.
function filterTLogInstances(tlogInstances, logID, integratedTime) {
    const targetDate = new Date(Number(integratedTime) * 1000);
    return tlogInstances.filter((tlog) => {
        // If the log IDs don't match, we can't use this tlog
        if (!tlog.logId?.keyId.equals(logID)) {
            return false;
        }
        // If the tlog doesn't have a public key, we can't use it
        const publicKey = tlog.publicKey;
        if (publicKey === undefined) {
            return false;
        }
        // If the tlog doesn't have a rawBytes field, we can't use it
        if (publicKey.rawBytes === undefined) {
            return false;
        }
        // If the tlog doesn't have a validFor field, we don't need to check it
        if (publicKey.validFor === undefined) {
            return true;
        }
        // Check that the integrated time is within the validFor range
        return (publicKey.validFor.start &&
            publicKey.validFor.start <= targetDate &&
            (!publicKey.validFor.end || targetDate <= publicKey.validFor.end));
    });
}