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import sodium from 'libsodium-wrappers';
export default class EncryptionService {
/**
*
* @param {BasicClassLoader} classLoader
*/
constructor(classLoader) {
this._ready = classLoader.getClass('state.boolean', false);
this._classLoader = classLoader;
sodium.ready.then(() => {this._ready.set(true);});
}
/**
*
* @returns {Promise<Boolean>}
*/
async ready() {
await this._ready.awaitTrue();
return true;
}
/**
* @returns {Boolean}
*/
enabled() {
return this._ready.get();
}
/**
* Encrypt the message with the given key and return a hex encoded string
*
* @param {String} message
* @param {String} passphrase
* @returns {String}
*/
encrypt(message, passphrase) {
if(!this.enabled()) throw this._classLoader.getClass('exception.encryption.enabled');
let {key, salt} = this._passwordToKey(passphrase);
let encrypted = this._encrypt(message, key);
return sodium.to_hex(new Uint8Array([...salt, ...encrypted]));
}
/**
* Decrypt the hex encoded message with the given key
*
* @param {String} message
* @param {Uint8Array} passphrase
* @returns {String}
*/
decrypt(message, passphrase) {
if(!this.enabled()) throw this._classLoader.getClass('exception.encryption.enabled');
let encodedString = sodium.from_hex(message),
salt = encodedString.slice(0, sodium.crypto_pwhash_SALTBYTES),
text = encodedString.slice(sodium.crypto_pwhash_SALTBYTES),
{key, } = this._passwordToKey(passphrase, salt);
return sodium.to_string(this._decrypt(text, key));
}
/**
* Encrypt the message with the given key and return a hex encoded string
*
* @param {String} message
* @param {String} passphrase
* @returns {Promise<String>}
*/
async encryptAsync(message, passphrase) {
await this.ready();
return this.encrypt(message, passphrase);
}
/**
Decrypt the hex encoded message with the given key
@param {String} message
@param {Uint8Array} passphrase
* @returns {Promise<String>}
*/
async decryptAsync(message, passphrase) {
await this.ready();
return this.decrypt(message, passphrase);
}
/**
* Encrypt the message with the given key
*
* @param {String} message
* @param {String} key
* @returns {Uint8Array}
* @private
*/
_encrypt(message, key) {
let nonce = sodium.randombytes_buf(sodium.crypto_secretbox_NONCEBYTES);
return new Uint8Array([...nonce, ...sodium.crypto_secretbox_easy(message, nonce, key)]);
}
/**
* Decrypt the message with the given key
*
* @param {Uint8Array} encrypted
* @param {Uint8Array} key
* @returns {Uint8Array}
* @private
*/
_decrypt(encrypted, key) {
if(encrypted.length < sodium.crypto_secretbox_NONCEBYTES + sodium.crypto_secretbox_MACBYTES) throw new Error('Invalid encrypted text length');
let nonce = encrypted.slice(0, sodium.crypto_secretbox_NONCEBYTES),
ciphertext = encrypted.slice(sodium.crypto_secretbox_NONCEBYTES);
return sodium.crypto_secretbox_open_easy(ciphertext, nonce, key);
}
// noinspection JSMethodCanBeStatic
/**
*
* @param {String} password
* @param {String} salt
* @return {{salt: *, key: *}}
* @private
*/
_passwordToKey(password, salt = null) {
if(salt === null) {
salt = sodium.randombytes_buf(sodium.crypto_pwhash_SALTBYTES);
}
let key = sodium.crypto_pwhash(
sodium.crypto_box_SEEDBYTES,
password,
salt,
sodium.crypto_pwhash_OPSLIMIT_INTERACTIVE,
sodium.crypto_pwhash_MEMLIMIT_INTERACTIVE,
sodium.crypto_pwhash_ALG_DEFAULT
);
return {key, salt};
}
}
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