/**
 * 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 using legacy v1 SJCL (PBKDF2-SHA256 + AES-256-CCM). */
export declare function encrypt(password: string, plaintext: string, options?: {
    salt?: Buffer;
    iv?: Buffer;
    adata?: string;
}): string;
/** Decrypt a v1 SJCL envelope. */
export declare function decrypt(password: string, ciphertext: string): string;
/**
 * Auto-detect v1 (SJCL) or v2 (Argon2id + AES-256-GCM) from the envelope `v` field and decrypt.
 *
 * Migration path from sync `decrypt()`. Move call sites to `decryptAsync()` before
 * the breaking release that flips the default to v2.
 */
export declare function decryptAsync(password: string, ciphertext: string): Promise<string>;
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