Javascript AES encryption

Question

Is there a library available for AES 256-bits encryption in Javascript

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Another solution w AES-256 support  https   github com digitalbazaar forge

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JSAES is a powerful implementation of AES in JavaScript  http   point-at-infinity org jsaes

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Use CryptoJS  Here s the code  https   github com odedhb AES-encrypt  And here s an online working example  https   odedhb github io AES-encrypt

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There is also a Stanford free lib as an alternative to Cryptojs  http   crypto stanford edu sjcl

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Googling  JavaScript AES  has found several examples  The first one that popped up is designed to explain the algorithm as well as provide a solution   Movable Type Scripts  AES

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This post is now old  but the crypto-js  may be now the most complete javascript encryption library   CryptoJS is a collection of cryptographic algorithms implemented in JavaScript   It includes the following cyphers  AES-128  AES-192  AES-256  DES  Triple DES  Rabbit  RC4  RC4Drop and hashers  MD5  RIPEMD-160  SHA-1  SHA-256  SHA-512  SHA-3 with 224  256  384  or 512 bits    You may want to look at their Quick-start Guide which is also the reference for the following node js port   node-cryptojs-aes is a node js port of crypto-js

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Here s a demonstration page that uses slowAES    slowAES was easy to use  Logically designed   Reasonable OO packaging   Supports knobs and levers like IV and Encryption mode   Good compatibility with  NET C    The name is tongue-in-cheek  it s called  slow AES  because it s not implemented in C     But in my tests it was not impractically slow   It lacks an ECB mode  Also lacks a CTR mode  although you could build one pretty easily given an ECB mode  I guess   It is solely focused on encryption  A nice complementary class that does RFC2898-compliant password-based key derivation  in Javascript  is available from Anandam   This pair of libraries works well with the analogous  NET classes   Good interop  Though  in contrast to SlowAES  the Javascript PBKDF2 is noticeably slower than the Rfc2898DeriveBytes class when generating keys     It s not surprising that technically there is good interop  but the key point for me was the model adopted by SlowAES is familiar and easy to use  I found some of the other Javascript libraries for AES to be hard to understand and use   For example  in some of them I couldn t find the place to set the IV  or the mode  CBC  ECB  etc    Things were not where I expected them to be    SlowAES was not like that  The properties were right where I expected them to be  It was easy for me to pick up  having been familiar with the Java and  NET crypto programming models   Anandam s PBKDF2 was not quite on that level  It supported only a single call to DeriveBytes function  so if you need to derive both a key and an IV from a password  this library won t work  unchanged   Some slight modification  and it is working just fine for that purpose     EDIT  I put together an example of packaging SlowAES and a modified version of Anandam s PBKDF2 into Windows Script Components   Using this AES with a password-derived key shows good interop with the  NET RijndaelManaged class    EDIT2  the demo page shows how to use this AES encryption from a web page   Using the same inputs  iv  key  mode  etc  supported in  NET gives you good interop with the  NET Rijndael class  You can do a  view source  to get the javascript for that page   EDIT3 a late addition  Javascript Cryptography considered harmful  Worth the read

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Recently I had the need to perform some encryption decryption interoperability between javascript and python   Specifically      1  Using AES to encrypt in javascript and decrypt in python  Google App Engine  2  Using RSA to encrypt in javascript and decrypt in python  Google App Engine  3  Using pycrypto  I found lots and lots of different versions of RSA and AES floating around the web and  they were all different in their approach but I did not find a good example of end to end javascript and python interoperability   Eventually I managed to cobble together something that suited my needs after a lot of trial and error   Anyhow I knocked up an example of a js webapp talking to a google app engine hosted python server that uses AES and public key and private key RSA stuff   I though I d include it here by link in case it will be of some use to others who need to accomplish the same thing   http   www ipowow com files aesrsademo tar gz  and see demo at rsa-aes-demo DOT appspot DOT com  edit  look at the browser console output and also view source to get some hints and useful messages as to what s going on in the demo  edit  updated very old and defunct link to source to now point to  https   sestertii com files aesrsademo tar gz

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Try asmcrypto js     it s really fast   PS  I m an author and I can answer your questions if any  Also I d be glad to get some feedback

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Here is the only solution that worked for me   http   www hanewin net encrypt aes aes htm  It s pretty basic  but simple to use and seems to work well

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If you are trying to use javascript to avoid using SSL  think again  There are many half-way measures  but only SSL provides secure communication  Javascript encryption libraries can help against a certain set of attacks  but not a true man-in-the-middle attack  The following article explains how to attempt to create secure communication with javascript  and how to get it wrong  Use JavaScript encryption module instead of SSL HTTPS Note  If you are looking for SSL for google app engine on a custom domain  take a look at wwwizer com

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http   www movable-type co uk scripts aes html library may be of some help

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In my searches for AES encryption i found this from some Standford students   Claims to be fastest out there  Supports CCM  OCB  GCM and Block encryption  http   crypto stanford edu sjcl

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Judging from my own experience  asmcrypto js provides the fastest AES implementation in JavaScript  especially in Firefox since it can fully leverage asm js there    From the readme    Chrome 31 0 SHA256  51 MiB s  9 times faster than SJCL and CryptoJS  AES-CBC  47 MiB s  13 times faster than CryptoJS and 20 times faster than SJCL   Firefox 26 0 SHA256  144 MiB s  5 times faster than CryptoJS and 20 times faster than SJCL  AES-CBC  81 MiB s  3 times faster than CryptoJS and 8 times faster than SJCL     Edit  The Web Cryptography API is now implemented in most browsers and should be used as the primary solution if you care about performance  Be aware that IE11 implemented an earlier draft version of the standard which did not use promises   Some examples can be found here    Web Cryptography API Examples on GitHub Deriving Keys from Passwords with WebCrypto

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