import * as stream from 'stream';

type CipherAlgorithm = 'aes-256-gcm' | 'chacha20-poly1305';

/**
 * Generate a 64 byte hex-encoded main secret string.
 *
 * @returns a hex-encoded string representation (128 hex characters)
 */
declare function generateSerializedMainSecret(): string;
/**
 * Decode a serialized main secret to a Buffer.
 *
 * @param serialized hex-encoded string of 64 bytes (128 hex characters)
 * @returns
 */
declare function decodeMainSecret(serialized: string): Buffer;

declare module 'node:stream' {
    function compose(...streams: (Stream | Iterable<Buffer | string> | AsyncIterable<Buffer | string> | Function)[]): Duplex;
}
declare function encryptFile(mainSecret: Buffer | Uint8Array, context: string, algorithm?: CipherAlgorithm): stream.Duplex;
declare function decryptFile(mainSecret: Buffer | Uint8Array, context: string): stream.Duplex;

export { CipherAlgorithm, decodeMainSecret, decryptFile, encryptFile, generateSerializedMainSecret };