@hpke/chacha20poly1305/script/src/chacha/chacha.d.ts

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

/**
 * This file is based on noble-ciphers (https://github.com/paulmillr/noble-ciphers).
 *
 * noble-ciphers - MIT License (c) 2023 Paul Miller (paulmillr.com)
 *
 * The original file is located at:
 * https://github.com/paulmillr/noble-ciphers/blob/749cdf9cd07ebdd19e9b957d0f172f1045179695/src/chacha.ts
 */
import { type ARXCipher, type CipherWithOutput, type XorStream } from "./utils.js";
/**
 * ChaCha stream cipher. Conforms to RFC 8439 (IETF, TLS). 12-byte nonce, 4-byte counter.
 * With smaller nonce, it's not safe to make it random (CSPRNG), due to collision chance.
 */
export declare const chacha20: XorStream;
/**
 * AEAD algorithm from RFC 8439.
 * Salsa20 and chacha (RFC 8439) use poly1305 differently.
 * We could have composed them, but it's hard because of authKey:
 * In salsa20, authKey changes position in salsa stream.
 * In chacha, authKey can't be computed inside computeTag, it modifies the counter.
 */
export declare const _poly1305_aead: (xorStream: XorStream) => (key: Uint8Array, nonce: Uint8Array, AAD?: Uint8Array) => CipherWithOutput;
/**
 * ChaCha20-Poly1305 from RFC 8439.
 *
 * Unsafe to use random nonces under the same key, due to collision chance.
 * Prefer XChaCha instead.
 */
export declare const chacha20poly1305: ARXCipher;
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