/**
 * A WebCrypto `CryptoKey`, declared structurally so core's published types
 * need neither the DOM lib nor Node's types. Every runtime's native
 * `CryptoKey` satisfies it.
 */
export interface WebCryptoKey {
    readonly type: string;
    readonly extractable: boolean;
    readonly algorithm: object;
    readonly usages: readonly string[];
}
/** The subset of `SubtleCrypto` this package calls, typed loosely on purpose (see {@link WebCryptoKey}). */
export interface WebCryptoSubtle {
    importKey(format: 'raw' | 'jwk', keyData: object, algorithm: object, extractable: boolean, usages: string[]): Promise<WebCryptoKey>;
    exportKey(format: 'raw', key: WebCryptoKey): Promise<ArrayBuffer>;
    generateKey(algorithm: object, extractable: boolean, usages: string[]): Promise<{
        publicKey: WebCryptoKey;
        privateKey: WebCryptoKey;
    }>;
    deriveBits(algorithm: object, baseKey: WebCryptoKey, length: number): Promise<ArrayBuffer>;
    sign(algorithm: string, key: WebCryptoKey, data: Uint8Array<ArrayBuffer>): Promise<ArrayBuffer>;
    encrypt(algorithm: object, key: WebCryptoKey, data: Uint8Array<ArrayBuffer>): Promise<ArrayBuffer>;
    decrypt(algorithm: object, key: WebCryptoKey, data: Uint8Array<ArrayBuffer>): Promise<ArrayBuffer>;
    digest(algorithm: string, data: Uint8Array<ArrayBuffer>): Promise<ArrayBuffer>;
}
/** The WebCrypto subtle interface, or a closed-set failure when the runtime lacks it. */
export declare function webCryptoSubtle(): WebCryptoSubtle;