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Node.js AES file encryption with authentication promise
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| 'use strict' | |
| /** | |
| * AES file encryption with authentication (using Promises) | |
| * (C) Habib Rehman 2016 | |
| ******************************/ | |
| const encrypt = function (origpath, destpath, key) { | |
| // decrypts any arbitrary data passed with the pass | |
| return new Promise(function (resolve, reject) { | |
| // readstream to read the (unencrypted) file | |
| const origin = fs.createReadStream(origpath) | |
| // writestream to write (encrypted) file | |
| const dest = fs.createWriteStream(destpath) | |
| // generate a cryptographically secure random iv | |
| const iv = scrypto.randomBytes(defaults.ivLength) | |
| // create the AES-256-GCM cipher with iv and derive encryption key | |
| const cipher = scrypto.createCipheriv(defaults.algorithm, key, iv) | |
| // Read file, apply tranformation (encryption) to stream and | |
| // then write stream to filesystem | |
| origin.pipe(cipher).pipe(dest) | |
| // readstream error handler | |
| origin.on('error', (err) => { | |
| // reject on readstream error | |
| reject(err) | |
| }) | |
| // cipher error handler | |
| cipher.on('error', (err) => { | |
| // reject on cipher error | |
| reject(err) | |
| }) | |
| // writestream error handler | |
| dest.on('error', (err) => { | |
| // reject on writestream | |
| reject(err) | |
| }) | |
| // writestream finish handler | |
| dest.on('finish', () => { | |
| // get the generated Message Authentication Code | |
| const tag = cipher.getAuthTag() | |
| // return all the credentials used for encryption | |
| resolve({ | |
| key, | |
| iv, | |
| tag | |
| }) | |
| }) | |
| }) | |
| } |
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