export declare function isKeyLike(key: any): key is {
    type: string;
};
export declare const keyFormatErrorMessage = "Specified signing key must be either a valid PKCS1 or PKCS8 PEM string, a base64 encoded PEM, or an imported key";
export declare function base64ToUint8Array(base64: string): Uint8Array;
export declare function uint8ArrayToBase64(array: Uint8Array): string;
export declare function unwrapPem(key: string): Uint8Array;
export declare function toPkcs8Pem(key: Uint8Array): string;
export declare function pkcs1to8(pkcs1: Uint8Array): Uint8Array;
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