/**
 * Checks if the data string is a base64 encoded payload
 *
 * @param {string} data - A string to be tested
 * @returns {boolean} - True if the string is a valid base64 format
 */
declare const isBase64: (data: string) => boolean;
/**
 * Returns all fingerprints contained in the specified key
 * @param {string} asciiArmoredKey - The private / public key you want the fingerprints in ASCII Armored Format
 * @returns {string[]} the fingerprints in the specified keys
 */
declare const getKeyFingerprints: (asciiArmoredKey: string) => any;
/**
 * Loads the specified key into memory store for later use
 *
 * Both public and private keys can be loaded using loadKey
 * @param {string} asciiArmoredKey - The private / public key you want the fingerprints in ASCII Armored Format
 * @returns {Promise<string>} the first fingerprint of the loaded key
 */
declare const loadKey: (asciiArmoredKey: string) => Promise<unknown>;
/**
 * Signs the specified data using a pre-loaded and pre-unlocked key specified by fingerprint
 *
 * The key should be previously loaded with loadKey and unlocked with unlockKey
 * The data should be always encoded as base64
 *
 * @param {string} data - Base64 Encoded Data to be signed
 * @param {string} fingerprint - Fingerprint of the key used to sign data
 * @returns {Promise<string>} - The ASCII Armored PGP Signature
 */
declare const signData: (data: string, fingerprint: string) => Promise<string>;
/**
 * Verifies the signature of a payload and returns true if it's valid.
 *
 * The data should be always encoded as base64
 * The signature field can be in ASCII Armored Format or base64 encoded binary PGP Signature
 *
 * @param {string} data - Base64 Encoded Data to be signed
 * @param {string} signature - A ASCII Armored Format or Base64 Encoded Binary PGP Signature
 * @returns {Promise<boolean>}
 */
declare const verifySignature: (data: string, signature: string) => Promise<boolean | void>;
/**
 * Unlocks a pre-loaded private key with the specified password
 *
 * The private key should be pre-loaded with loadKey function
 *
 * @param {string} fingerprint - Fingerprint of the private key that should be unlocked for use
 * @param {string} password - Password of the private key
 * @returns {Promise}
 */
declare const unlockKey: (fingerprint: string, password: string) => Promise<unknown>;
/**
 * Generates a new PGP Private Key by the specified password, identifier and bits (key-length)
 *
 * The Identifier should be in one of the following formats:
 *  - "Name"
 *  - "Name <email>"
 * The key-length (bits parameter) should not be less than 2048
 * The key is not automatically loaded into memory after generation
 *
 * @param {string} password - The password to encrypt the private key
 * @param {string} identifier - The identifier of the key
 * @param {number} bits - Number of bits of the RSA Key (recommended 3072)
 * @returns {Promise<string>} - The generated private key
 */
declare const generateKey: (password: string, identifier: string, bits: number) => Promise<string | void>;
/**
 * Returns a ASCII Armored public key of a pre-loaded key
 *
 * The public/private key should be pre-loaded with loadKey
 *
 * @param {string} fingerprint - Fingerprint to fetch the public key
 * @returns {string} - The public key
 */
declare const getPublicKey: (fingerprint: string) => string;
/**
 * Signs the specified data using a pre-loaded and pre-unlocked key specified by fingerprint
 * and returns in Quanto Signature Format
 *
 * The key should be previously loaded with loadKey and unlocked with unlockKey
 * The data should be always encoded as base64
 *
 * @param {string} data - Base64 Encoded Data to be signed
 * @param {string} fingerprint - Fingerprint of the key used to sign data
 * @returns {Promise<string>} - The ASCII Armored PGP Signature
 */
declare const quantoSignData: (data: string, fingerprint: string) => Promise<string>;
/**
 * Verifies the signature in Quanto Signature Format of a payload and returns true if it's valid.
 *
 * The data should be always encoded as base64
 * The signature field can be in ASCII Armored Format or base64 encoded binary PGP Signature
 *
 * @param {string} data - Base64 Encoded Data to be signed
 * @param {string} signature - A ASCII Armored Format or Base64 Encoded Binary PGP Signature
 * @returns {Promise<boolean>}
 */
declare const quantoVerifySignature: (data: string, signature: string) => Promise<boolean | void>;
/**
 * Changes a private key password
 *
 * @param {string} keyData - The private key
 * @param {string} currentPassword - The current password of the key
 * @param {string} newPassword - The new password for the key
 * @returns {Promise<string>>} the same private key encrypted with the newPassword
 */
declare const changeKeyPassword: (keyData: string, currentPassword: string, newPassword: string) => Promise<string | void>;
export { verifySignature, signData, getKeyFingerprints, loadKey, unlockKey, generateKey, getPublicKey, isBase64, quantoSignData, quantoVerifySignature, changeKeyPassword, };