/**
 * convert a 4 element Uint8Array to a 4 byte Number
 *
 * @param bytes
 * @return 4 byte number
 */
export declare function bytesToWord(bytes?: Uint8Array | number[]): number;
/**
 * Encrypt `plaintext` with `password`. Defaults to v2 (Argon2id + AES-256-GCM).
 *
 * Pass `encryptionVersion: 1` to produce a legacy v1 (SJCL) envelope; this is the
 * only supported way to request v1 encryption.
 */
export declare function encrypt(password: string, plaintext: string, options?: {
    salt?: Buffer;
    iv?: Buffer;
    adata?: string;
    encryptionVersion?: 1 | 2;
}): Promise<string>;
/**
 * Auto-detect v1 (SJCL) or v2 (Argon2id + AES-256-GCM) from the envelope `v` field and decrypt.
 */
export declare function decrypt(password: string, ciphertext: string): Promise<string>;
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