Project

General

Profile

« Previous | Next » 

Revision 7218849a

Added by koszko over 1 year ago

add a mapping/resources installation dialog

View differences:

common/misc.js
45 45 
#FROM common/browser.js      IMPORT browser
46 46 
#FROM common/stored_types.js IMPORT TYPE_NAME, TYPE_PREFIX
47 47 

  		




  
  48
  
    
/* uint8_to_hex is a separate function used in cryptographic functions. */


  		




  
  49
  
    
const uint8_to_hex =


  		




  
  50
  
    
      array => [...array].map(b => ("0" + b.toString(16)).slice(-2)).join("");


  		




  
  51
  
    

  		




  48
  52
  
    
/*


  		




  49
  
  
    
 * generating unique, per-site value that can be computed synchronously


  		




  50
  
  
    
 * and is impossible to guess for a malicious website


  		




  
  53
  
    
 * Asynchronously compute hex string representation of a sha256 digest of a


  		




  
  54
  
    
 * UTF-8 string.


  		




  51
  55
  
    
 */


  		




  52
  
  
    

  		




  53
  
  
    
/* Uint8toHex is a separate function not exported as (a) it's useful and (b) it will be used in crypto.subtle-based digests */


  		




  54
  
  
    
function Uint8toHex(data)


  		




  55
  
  
    
{


  		




  56
  
  
    
    let returnValue = '';


  		




  57
  
  
    
    for (let byte of data)


  		




  58
  
  
    
	returnValue += ('00' + byte.toString(16)).slice(-2);


  		




  59
  
  
    
    return returnValue;


  		




  
  56
  
    
async function sha256_async(string) {


  		




  
  57
  
    
    const input_ab = new TextEncoder("utf-8").encode(string);


  		




  
  58
  
    
    const digest_ab = await crypto.subtle.digest("SHA-256", input_ab);


  		




  
  59
  
    
    return uint8_to_hex(new Uint8Array(digest_ab));


  		




  60
  60
  
    
}


  		




  
  61
  
    
#EXPORT sha256_async


  		




  61
  62
  
    

  		




  
  63
  
    
/*


  		




  
  64
  
    
 * Generate a unique value that can be computed synchronously and is impossible


  		




  
  65
  
    
 * to guess for a malicious website.


  		




  
  66
  
    
 */


  		




  62
  67
  
    
function gen_nonce(length=16)


  		




  63
  68
  
    
{


  		




  64
  
  
    
    let randomData = new Uint8Array(length);


  		




  65
  
  
    
    crypto.getRandomValues(randomData);


  		




  66
  
  
    
    return Uint8toHex(randomData);


  		




  
  69
  
    
    const random_data = new Uint8Array(length);


  		




  
  70
  
    
    crypto.getRandomValues(random_data);


  		




  
  71
  
    
    return uint8_to_hex(random_data);


  		




  67
  72
  
    
}


  		




  68
  73
  
    
#EXPORT gen_nonce


  		




  69
  74
  
    

  		












Also available in:  Unified diff