import { Crypto } from "./crypto";
export declare class Sm2 extends Crypto {
    static PRIVKEY_LEN: number;
    static KEY_TYPE: string;
    static generateMnemonicAndKey(): {
        mnemonic: string;
        privateKey: string;
        publicKey: string;
    };
    /**
     * Calculates the public key from a given private key.
     * @param privateKeyHex The private key hexstring
     * @param mode Pubkey Type 'compress' or ''
     * @returns Public key {type:type, value:hexstring}
     */
    static getPublicKeyFromPrivateKey(privateKeyHex: string, mode?: string): string;
    static generateKey(): {
        privateKey: string;
        publicKey: string;
    };
    /**
     * Generates a signature (base64 string) for a signDocSerialize based on given private key.
     * @param signMsg from protobuf and tx.
     * @param privateKeyHex The private key.
     * @returns Signature. Does not include tx.
     */
    static sign(signMsg: string, privateKeyHex: string): Promise<string>;
    /**
     * Verifies a signature (64 byte <r,s>) given the sign bytes and public key.
     * @param sigValue The signature base64 string.
     * @param signMsg Unsigned transaction sign msg string.
     * @param publicKeyHex The public key.
     * @returns Signature. Does not include tx.
     */
    static signVerify(signMsg: string, sigValue: string, publicKeyHex: string): Promise<any>;
    static encrypt(msg: string, publicKeyHex: string): Promise<string>;
    static decrypt(encryptDataHex: string, privateKeyHex: string): Promise<any>;
}