@hpke/core/esm/src/exporterContext.js

A Hybrid Public Key Encryption (HPKE) core module for various JavaScript runtimes

import { ExportError, INPUT_LENGTH_LIMIT, InvalidParamError, toArrayBuffer, } from "@hpke/common";
import { emitNotSupported } from "./utils/emitNotSupported.js";
// b"sec"
const LABEL_SEC = new Uint8Array([115, 101, 99]);
export class ExporterContextImpl {
    constructor(api, kdf, exporterSecret) {
        Object.defineProperty(this, "_api", {
            enumerable: true,
            configurable: true,
            writable: true,
            value: void 0
        });
        Object.defineProperty(this, "exporterSecret", {
            enumerable: true,
            configurable: true,
            writable: true,
            value: void 0
        });
        Object.defineProperty(this, "_kdf", {
            enumerable: true,
            configurable: true,
            writable: true,
            value: void 0
        });
        this._api = api;
        this._kdf = kdf;
        this.exporterSecret = exporterSecret;
    }
    async seal(_data, _aad) {
        return await emitNotSupported();
    }
    async open(_data, _aad) {
        return await emitNotSupported();
    }
    async export(exporterContext, len) {
        const rawExporterContext = toArrayBuffer(exporterContext);
        if (rawExporterContext.byteLength > INPUT_LENGTH_LIMIT) {
            throw new InvalidParamError("Too long exporter context");
        }
        try {
            return await this._kdf.labeledExpand(this.exporterSecret, LABEL_SEC, new Uint8Array(rawExporterContext), len);
        }
        catch (e) {
            throw new ExportError(e);
        }
    }
}
export class RecipientExporterContextImpl extends ExporterContextImpl {
}
export class SenderExporterContextImpl extends ExporterContextImpl {
    constructor(api, kdf, exporterSecret, enc) {
        super(api, kdf, exporterSecret);
        Object.defineProperty(this, "enc", {
            enumerable: true,
            configurable: true,
            writable: true,
            value: void 0
        });
        this.enc = enc;
        return;
    }
}