import { type KeyAlgorithm, type KeyPair, type PrivateKey, type PublicKey, type SymmetricKey } from '@opentdf/sdk/singlecontainer';
interface VirtruCryptoKeyHandle {
    release(): void;
    [key: string]: unknown;
}
export type OpaquePublicKey = PublicKey & {
    readonly _internal: VirtruCryptoKeyHandle;
};
export type OpaquePrivateKey = PrivateKey & {
    readonly _internal: VirtruCryptoKeyHandle;
};
export type OpaqueSymmetricKey = SymmetricKey & {
    readonly _internal: VirtruCryptoKeyHandle;
};
export declare const keyFinalizer: FinalizationRegistry<{
    release(): void;
}>;
export declare function wrapPublicKey(key: VirtruCryptoKeyHandle, algorithm: KeyAlgorithm): PublicKey;
export declare function wrapPrivateKey(key: VirtruCryptoKeyHandle, algorithm: KeyAlgorithm): PrivateKey;
export declare function wrapSymmetricKey(key: VirtruCryptoKeyHandle, lengthBits: number): SymmetricKey;
export declare function wrapKeyPair(publicKey: VirtruCryptoKeyHandle, privateKey: VirtruCryptoKeyHandle, algorithm: KeyAlgorithm): KeyPair;
export declare function unwrapPublicKey(key: PublicKey): VirtruCryptoKeyHandle;
export declare function unwrapPrivateKey(key: PrivateKey): VirtruCryptoKeyHandle;
export declare function unwrapSymmetricKey(key: SymmetricKey): VirtruCryptoKeyHandle;
export declare function isSymmetricKey(value: unknown): value is SymmetricKey;
export {};