import type { KeyRef, KmsProvider } from "./kms.js";
export declare function generateSymmetricKmsKey(): string;
export declare abstract class SymmetricAesGcmKmsProvider implements KmsProvider {
    private readonly keyB64;
    abstract readonly name: KmsProvider["name"];
    protected abstract readonly prefix: string;
    protected abstract readonly label: string;
    private keyPromise;
    protected constructor(keyB64: string);
    private getKey;
    encrypt(plaintext: string, _key: KeyRef): Promise<string>;
    decrypt(ciphertext: string, _key: KeyRef): Promise<string>;
}
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