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import sodium from 'libsodium-wrappers';
export default class CSEv1Encryption {
/**
* @param {BasicClassLoader} classLoader
*/
constructor(classLoader) {
this.fields = {
password: ['url', 'label', 'notes', 'password', 'username', 'customFields'],
folder : ['label'],
tag : ['label', 'color']
};
this._enabled = classLoader.getClass('state.boolean', false);
this._ready = classLoader.getClass('state.boolean', false);
this._keychain = null;
this._classLoader = classLoader;
sodium.ready.then(() => {this._ready.set(true);});
}
/**
*
* @returns {Promise<Boolean>}
*/
async ready() {
await this._ready.awaitTrue() && await this._enabled.awaitTrue();
return true;
}
/**
* @returns {Boolean}
*/
enabled() {
return this._ready.get() && this._enabled.get();
}
/**
* Encrypts an object
*
* @param {Object} object
* @param {String} type
* @returns {Object}
*/
async encrypt(object, type) {
if(!this.fields.hasOwnProperty(type)) throw this._classLoader.getClass('exception.encryption.object');
if(!this.enabled()) throw this._classLoader.getClass('exception.encryption.enabled');
let fields = this.fields[type],
key = this._keychain.getCurrentKey();
for(let field of fields) {
let data = object[field];
if(data === null || data === undefined || data.length === 0) continue;
object[field] = this._encryptString(data, key);
}
object.cseType = 'CSEv1r1';
object.cseKey = this._keychain.getCurrentKeyId();
return object;
}
/**
* Decrypts an object
*
* @param {Object} object
* @param {String} type
* @returns {Object}
*/
async decrypt(object, type) {
if(!this.fields.hasOwnProperty(type)) throw this._classLoader.getClass('exception.encryption.object');
if(object.cseType !== 'CSEv1r1') throw this._classLoader.getClass('exception.encryption.unsupported', object, 'CSEv1r1');
if(!this.enabled()) throw this._classLoader.getClass('exception.encryption.enabled');
let fields = this.fields[type],
key = this._keychain.getKey(object.cseKey);
for(let field of fields) {
let data = object[field];
if(data === null || data.length === 0) continue;
object[field] = this._decryptString(data, key);
}
return object;
}
/**
* Encrypt the message with the given key and return a hex encoded string
*
* @param {String} message
* @param {Uint8Array} key
* @returns {String}
* @private
*/
_encryptString(message, key) {
return sodium.to_hex(this._encrypt(message, key));
}
/**
* Decrypt the hex or base64 encoded message with the given key
*
* @param {String} encodedString
* @param {Uint8Array} key
* @returns {String}
* @private
*/
_decryptString(encodedString, key) {
try {
let encryptedString = sodium.from_hex(encodedString);
return sodium.to_string(this._decrypt(encryptedString, key));
} catch(e) {
let encryptedString = sodium.from_base64(encodedString);
return sodium.to_string(this._decrypt(encryptedString, key));
}
}
/**
* Encrypt the message with the given key
*
* @param {Uint8Array} message
* @param {Uint8Array} 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);
}
/**
* Decrypt and activate the keychain
*
* @param {CSEv1Keychain} keychain
* @private
*/
setKeychain(keychain) {
this._keychain = keychain;
keychain
.ready()
.then(() => {
this._enabled.set(true);
});
}
/**
* Remove the current keychain
*/
unsetKeychain() {
this._enabled.set(false);
this._keychain = null;
}
}
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