export type TKeyFormat = 'raw' | 'pkcs8' | 'spki';
export default class Ecdh {
    publicKey: string;
    privateKey: string;
    iv: string;
    __privateCryptoKey: CryptoKey | undefined;
    __sharedSecret: CryptoKey | undefined;
    __curve: string;
    __keyFormat: TKeyFormat;
    __subtle: SubtleCrypto;
    constructor(curve?: string, keyFormat?: TKeyFormat);
    generateKeys(): Promise<this>;
    exportKey(cryptoKey: CryptoKey, keyFormat?: TKeyFormat): Promise<string>;
    importKey(keyBase64: string, keyFormat?: TKeyFormat, usages?: KeyUsage[]): Promise<CryptoKey>;
    setPrivateKey(privateBase64: string): Promise<boolean>;
    deriveSharedSecret(publicKeyBase64: string, iv?: string): Promise<boolean>;
    deriveSharedBits(publicKeyBase64: string): Promise<ArrayBuffer | null>;
    deriveShareBase64(publicKeyBase64: string): Promise<string>;
    encode(data: string, iv?: string): Promise<string>;
    encodeiv(data: string, iv?: string, ivFirst?: boolean): Promise<string>;
    decode(encrypted: string, iv?: string): Promise<string>;
    decodeiv(encrypted: string, ivFirst?: boolean): Promise<string>;
}