import type { ISymmetricCipher } from './types';
/**
 * AES-256-GCM cipher over a base64-encoded 32-byte key. Blob format:
 * base64(iv ‖ ciphertext ‖ tag) — WebCrypto appends the GCM tag to the
 * ciphertext, so the layout is iv (12 bytes) followed by the sealed rest.
 */
export declare class SymmetricCipher implements ISymmetricCipher {
    protected key: Promise<CryptoKey>;
    constructor(key: string);
    encrypt(plain: string): Promise<string>;
    decrypt(blob: string): Promise<string>;
}
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