如何使用javascript加密和解密Uint8Array？

Question

I want encryption and decryption of a Uint8Array for that i have downloaded CryptoJS library from this link .

I have tested aes cipher algorithm on a dummy string its working fine.

Now i want it to implement it on Uint8Array. This array is holding a video file data.

Since the encryption and decryption works on a string, i have to convert it to a string for that i have referenced this question posted on the stackoverflow click here

Code for encryption is :

var encrypted = CryptoJS.AES.encrypt(String.fromCharCode.apply(null, uInt8Array), "test");

But when i ran the code following error is coming:

 Uncaught RangeError: Maximum call stack size exceeded 

How do i make it working?

Answer 1

That error is due the String.fromCharCode.apply(null, uInt8Array) part, CryptoJS is never called.

Note that full syntax of fromCharCode is String.fromCharCode(n1, n2, ..., nX) , so all elements of the given buffer must be moved to the stack in order to apply the function.

You must be using a very big buffer, a video file you said, so that must be the reason you got a stackoverflow error.

Try to use a `CryptoJS.lib.WordArray' instead, as described here:

http://groups.google.com/group/crypto-js/browse_thread/thread/4ce6fddad709954d?pli=1