@hpke/chacha20poly1305/esm/src/chacha20Poly1305.js

A Hybrid Public Key Encryption (HPKE) module extension for ChaCha20/Poly1305

import { chacha20poly1305 } from "@noble/ciphers/chacha";
import { AeadId } from "@hpke/common";
export class Chacha20Poly1305Context {
    constructor(key) {
        Object.defineProperty(this, "_key", {
            enumerable: true,
            configurable: true,
            writable: true,
            value: void 0
        });
        this._key = new Uint8Array(key);
    }
    async seal(iv, data, aad) {
        return await this._seal(iv, data, aad);
    }
    async open(iv, data, aad) {
        return await this._open(iv, data, aad);
    }
    _seal(iv, data, aad) {
        return new Promise((resolve) => {
            const ret = chacha20poly1305(this._key, new Uint8Array(iv), new Uint8Array(aad)).encrypt(new Uint8Array(data));
            resolve(ret.buffer);
        });
    }
    _open(iv, data, aad) {
        return new Promise((resolve) => {
            const ret = chacha20poly1305(this._key, new Uint8Array(iv), new Uint8Array(aad)).decrypt(new Uint8Array(data));
            resolve(ret.buffer);
        });
    }
}
/**
 * The ChaCha20Poly1305 for HPKE AEAD implementing {@link AeadInterface}.
 *
 * When using `@hpke/core`, the instance of this class can be specified
 * to the `aead` parameter of {@link CipherSuiteParams} instead of `AeadId.Chacha20Poly1305`
 * as follows:
 *
 * @example
 *
 * ```ts
 * import {
 *   CipherSuite,
 *   DhkemP256HkdfSha256,
 *   HkdfSha256,
 * } from "@hpke/core";
 * import {
 *   Chacha20Poly1305,
 * } from "@hpke/chacha20poly1305";
 *
 * const suite = new CipherSuite({
 *   kem: new DhkemP256HkdfSha256(),
 *   kdf: new HkdfSha256(),
 *   aead: new Chacha20Poly1305(),
 * });
 * ```
 *
 * This class is implemented using
 * {@link https://github.com/paulmillr/noble-ciphers | @noble/ciphers}.
 */
export class Chacha20Poly1305 {
    constructor() {
        /** AeadId.Chacha20Poly1305 (0x0003) */
        Object.defineProperty(this, "id", {
            enumerable: true,
            configurable: true,
            writable: true,
            value: AeadId.Chacha20Poly1305
        });
        /** 32 */
        Object.defineProperty(this, "keySize", {
            enumerable: true,
            configurable: true,
            writable: true,
            value: 32
        });
        /** 12 */
        Object.defineProperty(this, "nonceSize", {
            enumerable: true,
            configurable: true,
            writable: true,
            value: 12
        });
        /** 16 */
        Object.defineProperty(this, "tagSize", {
            enumerable: true,
            configurable: true,
            writable: true,
            value: 16
        });
    }
    createEncryptionContext(key) {
        return new Chacha20Poly1305Context(key);
    }
}