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+// TODO: This file was created by bulk-decaffeinate.
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+// Sanity-check the conversion and remove this comment.
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+/*
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+ * decaffeinate suggestions:
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+ * DS101: Remove unnecessary use of Array.from
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+ * DS102: Remove unnecessary code created because of implicit returns
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+ * DS207: Consider shorter variations of null checks
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+ * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
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+ */
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+const crypto = require('crypto');
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+
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+const Buffer = require('buffer').Buffer;
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+
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+const ALGORITHM = 'aes-256-ctr';
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+
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+const keyFn = (password, salt, callback)=> crypto.pbkdf2(password, salt, 10000, 64, 'sha1', callback);
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+
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+const keyFn32 = (password, salt, keyLength, callback)=> crypto.pbkdf2(password, salt, 10000, 32, 'sha1', callback);
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+
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+class AccessTokenEncryptor {
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+
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+ constructor(settings) {
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+
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+ this.settings = settings;
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+ this.cipherLabel = this.settings.cipherLabel;
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+ if (this.cipherLabel != null ? this.cipherLabel.match(/:/) : undefined) { throw Error("cipherLabel must not contain a colon (:)"); }
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+
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+ this.cipherPassword = this.settings.cipherPasswords[this.cipherLabel];
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+ if ((this.cipherPassword == null)) { throw Error("cipherPassword not set"); }
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+ if (this.cipherPassword.length < 16) { throw Error("cipherPassword too short"); }
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+ }
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+
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+ encryptJson(json, callback) {
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+ const string = JSON.stringify(json);
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+ return crypto.randomBytes(32, (err, bytes) => {
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+ if (err) { return callback(err); }
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+ const salt = bytes.slice(0, 16);
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+ const iv = bytes.slice(16, 32);
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+
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+ return keyFn32(this.cipherPassword, salt, 32, (err, key) => {
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+ if (err != null) {
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+ logger.err({err}, "error getting Fn key");
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+ return callback(err);
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+ }
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+
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+ const cipher = crypto.createCipheriv(ALGORITHM, key, iv);
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+ const crypted = cipher.update(string, 'utf8', 'base64') + cipher.final('base64');
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+
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+ return callback(null, `${this.cipherLabel}:${salt.toString('hex')}:${crypted}:${iv.toString('hex')}`);
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+ });
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+ });
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+ }
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+
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+ decryptToJson(encryptedJson, callback) {
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+ const [label, salt, cipherText, iv] = Array.from(encryptedJson.split(':', 4));
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+ const password = this.settings.cipherPasswords[label];
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+ if ((password == null) || (password.length < 16)) { return callback(new Error("invalid password")); }
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+
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+ if (iv) {
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+ return this.decryptToJsonV2(password, salt, cipherText, iv, callback);
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+ } else {
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+ return this.decryptToJsonV1(password, salt, cipherText, callback);
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+ }
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+ }
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+
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+ decryptToJsonV1(password, salt, cipherText, callback) {
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+ return keyFn(password, Buffer.from(salt, 'hex'), (err, key) => {
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+ let json;
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+ if (err != null) {
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+ logger.err({err}, "error getting Fn key");
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+ return callback(err);
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+ }
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+ const decipher = crypto.createDecipher(ALGORITHM, key);
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+ const dec = decipher.update(cipherText, 'base64', 'utf8') + decipher.final('utf8');
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+ try {
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+ json = JSON.parse(dec);
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+ } catch (e) {
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+ return callback(new Error("error decrypting token"));
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+ }
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+ return callback(null, json, true);
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+ });
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+ }
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+
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+ decryptToJsonV2(password, salt, cipherText, iv, callback) {
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+ return keyFn32(password, Buffer.from(salt, 'hex'), 32, (err, key) => {
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+ let json;
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+ if (err != null) {
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+ logger.err({err}, "error getting Fn key");
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+ return callback(err);
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+ }
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+
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+ const decipher = crypto.createDecipheriv(ALGORITHM, key, Buffer.from(iv, 'hex'));
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+ const dec = decipher.update(cipherText, 'base64', 'utf8') + decipher.final('utf8');
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+ try {
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+ json = JSON.parse(dec);
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+ } catch (e) {
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+ return callback(new Error("error decrypting token"));
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+ }
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+ return callback(null, json);
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+ });
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+ }
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+}
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+
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+module.exports = AccessTokenEncryptor;
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