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Improve randomness of UUIDs.

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This commit is contained in:
Neil Fraser
2015-11-24 19:16:01 -08:00
parent a239c7207f
commit e5dfdf4658
2 changed files with 36 additions and 14 deletions
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41
core/utils.js
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@@ -552,24 +552,43 @@ Blockly.tokenizeInterpolation = function(message) {
return tokens;
};
/**
* Legal characters for the unique ID.
* Should be all on a US keyboard. No XML special characters or control codes.
* @private
*/
Blockly.CHARACTER_SOUP_ = '!#$%()*+,-./:;=?@[]^_`{|}~' +
'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
/**
* Generate a unique ID. This should be globally unique.
* 88 characters ^ 20 length ≈ 129 bits (one bit better than a UUID).
* @return {string}
*/
Blockly.genUid = function() {
var length = 20;
var soupLength = Blockly.genUid.soup_.length;
var id = [];
for (var i = 0; i < 20; i++) {
id[i] = Blockly.CHARACTER_SOUP_.charAt(Math.random() *
Blockly.CHARACTER_SOUP_.length);
if (Blockly.genUid.crypto_) {
// Cryptographically strong randomness is supported.
var array = new Uint32Array(length);
Blockly.genUid.crypto_.getRandomValues(array);
for (var i = 0; i < length; i++) {
id[i] = Blockly.genUid.soup_.charAt(array[i] % soupLength);
}
} else {
// Fall back to Math.random for IE 10.
for (var i = 0; i < length; i++) {
id[i] = Blockly.genUid.soup_.charAt(Math.random() * soupLength);
}
}
return id.join('');
};
/**
* Determine if window.crypto or global.crypto exists.
* @type {=RandomSource}
* @private
*/
Blockly.genUid.crypto_ = this.crypto;
/**
* Legal characters for the unique ID.
* Should be all on a US keyboard. No XML special characters or control codes.
* @private
*/
Blockly.genUid.soup_ = '!#$%()*+,-./:;=?@[]^_`{|}~' +
'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';