github.com/jfrog/frogbot@v1.1.1-0.20231221090046-821a26f50338/action/node_modules/uuid/lib/rng-browser.js (about)

     1  // Unique ID creation requires a high quality random # generator.  In the
     2  // browser this is a little complicated due to unknown quality of Math.random()
     3  // and inconsistent support for the `crypto` API.  We do the best we can via
     4  // feature-detection
     5  
     6  // getRandomValues needs to be invoked in a context where "this" is a Crypto
     7  // implementation. Also, find the complete implementation of crypto on IE11.
     8  var getRandomValues = (typeof(crypto) != 'undefined' && crypto.getRandomValues && crypto.getRandomValues.bind(crypto)) ||
     9                        (typeof(msCrypto) != 'undefined' && typeof window.msCrypto.getRandomValues == 'function' && msCrypto.getRandomValues.bind(msCrypto));
    10  
    11  if (getRandomValues) {
    12    // WHATWG crypto RNG - http://wiki.whatwg.org/wiki/Crypto
    13    var rnds8 = new Uint8Array(16); // eslint-disable-line no-undef
    14  
    15    module.exports = function whatwgRNG() {
    16      getRandomValues(rnds8);
    17      return rnds8;
    18    };
    19  } else {
    20    // Math.random()-based (RNG)
    21    //
    22    // If all else fails, use Math.random().  It's fast, but is of unspecified
    23    // quality.
    24    var rnds = new Array(16);
    25  
    26    module.exports = function mathRNG() {
    27      for (var i = 0, r; i < 16; i++) {
    28        if ((i & 0x03) === 0) r = Math.random() * 0x100000000;
    29        rnds[i] = r >>> ((i & 0x03) << 3) & 0xff;
    30      }
    31  
    32      return rnds;
    33    };
    34  }