@hpke/core
Version:
A Hybrid Public Key Encryption (HPKE) core module for various JavaScript runtimes
83 lines (82 loc) • 3.24 kB
JavaScript
(function (factory) {
if (typeof module === "object" && typeof module.exports === "object") {
var v = factory(require, exports);
if (v !== undefined) module.exports = v;
}
else if (typeof define === "function" && define.amd) {
define(["require", "exports", "@hpke/common", "./exporterContext.js"], factory);
}
})(function (require, exports) {
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.EncryptionContextImpl = void 0;
const common_1 = require("@hpke/common");
const exporterContext_js_1 = require("./exporterContext.js");
class EncryptionContextImpl extends exporterContext_js_1.ExporterContextImpl {
constructor(api, kdf, params) {
super(api, kdf, params.exporterSecret);
// AEAD id.
Object.defineProperty(this, "_aead", {
enumerable: true,
configurable: true,
writable: true,
value: void 0
});
// The length in bytes of a key for the algorithm.
Object.defineProperty(this, "_nK", {
enumerable: true,
configurable: true,
writable: true,
value: void 0
});
// The length in bytes of a nonce for the algorithm.
Object.defineProperty(this, "_nN", {
enumerable: true,
configurable: true,
writable: true,
value: void 0
});
// The length in bytes of an authentication tag for the algorithm.
Object.defineProperty(this, "_nT", {
enumerable: true,
configurable: true,
writable: true,
value: void 0
});
// The end-to-end encryption key information.
Object.defineProperty(this, "_ctx", {
enumerable: true,
configurable: true,
writable: true,
value: void 0
});
if (params.key === undefined || params.baseNonce === undefined ||
params.seq === undefined) {
throw new Error("Required parameters are missing");
}
this._aead = params.aead;
this._nK = this._aead.keySize;
this._nN = this._aead.nonceSize;
this._nT = this._aead.tagSize;
const key = this._aead.createEncryptionContext(params.key);
this._ctx = {
key: key,
baseNonce: params.baseNonce,
seq: params.seq,
};
}
computeNonce(k) {
const seqBytes = (0, common_1.i2Osp)(k.seq, k.baseNonce.byteLength);
return (0, common_1.xor)(k.baseNonce, seqBytes).buffer;
}
incrementSeq(k) {
// if (this.seq >= (1 << (8 * this.baseNonce.byteLength)) - 1) {
if (k.seq > Number.MAX_SAFE_INTEGER) {
throw new common_1.MessageLimitReachedError("Message limit reached");
}
k.seq += 1;
return;
}
}
exports.EncryptionContextImpl = EncryptionContextImpl;
});