export interface EncryptResult {
    ciphertext: Uint8Array;
    iv: Uint8Array;
    tag: Uint8Array;
}
export declare function encrypt(key: CryptoKey, plaintext: string): Promise<EncryptResult>;
export declare function decrypt(key: CryptoKey, ciphertext: Uint8Array, iv: Uint8Array, tag?: Uint8Array): Promise<string>;
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