import CryptoBase from './crypto-base';
import { DecryptedContentV3, DecryptParams, DecryptParamsV3, EncryptedContentV3 } from './types';
export default class CryptoV3 extends CryptoBase {
    signingPublicKey?: string;
    constructor({ signingPublicKey }?: {
        signingPublicKey?: string;
    });
    /**
     * Encrypt input with a unique keypair for each submission.
     * @param msg The message to encrypt, will be stringified.
     * @param form The base-64 encoded form public key for encrypting.
     * @returns The encrypted basestring.
     */
    encrypt: (msg: any, formPublicKey: string) => EncryptedContentV3;
    /**
     * Decrypts an encrypted submission and returns it.
     * @param submissionSecretKey The base-64 encoded secret key for decrypting.
     * @param decryptParams The params containing encrypted content and information.
     * @param decryptParams.encryptedContent The encrypted content encoded with base-64.
     * @param decryptParams.version The version of the payload.
     * @returns The decrypted content if successful. Else, null will be returned.
     */
    decryptFromSubmissionKey: (submissionSecretKey: string, decryptParams: DecryptParams) => DecryptedContentV3 | null;
    /**
     * Decrypts an encrypted submission and returns it.
     * @param formSecretKey The base-64 encoded form secret key for decrypting the submission.
     * @param decryptParams The params containing encrypted content, encrypted submission key and information.
     * @param decryptParams.encryptedContent The encrypted content encoded with base-64.
     * @param decryptParams.encryptedSubmissionSecretKey The encrypted submission secret key encoded with base-64.
     * @param decryptParams.version The version of the payload. Used to determine the decryption process to decrypt the content with.
     * @returns The decrypted content if successful. Else, null will be returned.
     * @throws {MissingPublicKeyError} if a public key is not provided when instantiating this class and is needed for verifying signed content.
     */
    decrypt: (formSecretKey: string, decryptParams: DecryptParamsV3) => DecryptedContentV3 | null;
    /**
     * Returns true if a pair of public & secret keys are associated with each other
     * @param publicKey The public key to verify against.
     * @param secretKey The private key to verify against.
     */
    valid: (publicKey: string, secretKey: string) => boolean;
}