Does SJCL support TypedArray and Blob as input or output?

[tom]

it seems SJCL support only string as input/ouput. In case html5 media stream encryption,  it's important encrypt/decrypt on binary data, instead of string. Does SJSCL support binary typedarray or blob as input/output?

Best regards
  Tom

 

[vincenzoml]

Hi,

I just asked the very same question a couple of days ago:

https://groups.google.com/d/msg/sjcl-discuss/iVbb6X9S2a0/1MdbvQNjcG4J

and ended up using the following code, where p is an object of options, and where sjcl.codec.bytes is a codec that needs to be configured in the source (./configure --help, then enable the codec, then make and you get your sjcl.js).

    function encrypt(password,plaintext) {

var prp = new sjcl.cipher[p.cipher](sjcl.codec.bytes.toBits(new Uint8Array(password)));

        var ct = sjcl.mode[p.mode].encrypt(prp, sjcl.codec.bytes.toBits(new Uint8Array(plaintext)), p.iv, p.adata, p.ts);

        return (new Uint8Array(sjcl.codec.bytes.fromBits(ct))).buffer;

    }

    

    function decrypt(password,ciphertext){

var prp = new sjcl.cipher[p.cipher](sjcl.codec.bytes.toBits(new Uint8Array(password)));

        pt = sjcl.mode[p.mode].decrypt(prp, sjcl.codec.bytes.toBits(new Uint8Array(ciphertext)), p.iv, p.adata, p.ts);   

        return(new Uint8Array(sjcl.codec.bytes.fromBits(pt))).buffer;

    }

Vincenzo

[David Simon]

More recent versions of SJCL have a codec for ArrayBuffer:

https://github.com/bitwiseshiftleft/sjcl/blob/master/core/codecArrayBuffer.js