/**
 * Encrypts a payload using the provided RSA public key.
 * @param payload String to encrypt
 * @param publicKey RSA public key
 * @returns Base64 encoded string representing encrypted payload
 */
declare function publicEncryptRsa(payload: string, publicKey: string): Promise<string>;
/**
 * Decrypts a payload using the provided RSA private key. Returns the decrypted payload as a UTF-8 string.
 * @param encryptedPayload Base64 encoded string representing encrypted payload
 * @param privateKey
 * @returns UTF-8 encoded string representing decrypted payload
 */
declare function privateDecryptRsa(encryptedPayload: string, privateKey: string): Promise<string>;
/**
 * Encrypts a payload using the provided AES key and IV.
 * @param payload
 * @param aesKey Base64 encoded string or a Buffer, representing aes key
 * @param ivHex Optional. Hex encoded string representing IV. If not provided, a random IV will be generated.
 * It is recommended to always use a new IV for each encryption.
 * @returns
 */
declare function encryptAES(payload: string, aesKey: string | Buffer, ivHex?: string): {
    encryptedData: string;
    iv: string;
};
/**
 * Decrypts an AES encrypted payload using the provided key and IV.
 * @param encryptedPayload
 * @param aesKey Base64 encoded string or a Buffer, representing aes key
 * @param ivHex Hex encoded string representing IV
 * @returns
 */
declare function decryptAES(encryptedPayload: string, aesKey: string | Buffer, ivHex: string): string;
export { decryptAES, encryptAES, privateDecryptRsa, publicEncryptRsa };