It depends on what you mean: As mentioned String.hashCode() gives you a 32 bit hash code. If you want (say) a 64-bit hashcode you can easily implement it yourself. If you want a cryptographic hash of a String, the Java crypto libraries include implementations of MD5, SHA-1 and so on. You’ll typically need to turn … Read more
I would suggest using the members of string, but with an explicit encoding: byte[] bytes = text.getBytes(“UTF-8”); String text = new String(bytes, “UTF-8”); By using an explicit encoding (and one which supports all of Unicode) you avoid the problems of just calling text.getBytes() etc: You’re explicitly using a specific encoding, so you know which encoding … Read more
Here it is, modified from this query string parser: function getHashParams() { var hashParams = {}; var e, a = /\+/g, // Regex for replacing addition symbol with a space r = /([^&;=]+)=?([^&;]*)/g, d = function (s) { return decodeURIComponent(s.replace(a, ” “)); }, q = window.location.hash.substring(1); while (e = r.exec(q)) hashParams[d(e[1])] = d(e[2]); return hashParams; … Read more
I wouldn’t override .flatten, which is already defined: Returns a new array that is a one-dimensional flattening of this hash. That is, for every key or value that is an array, extract its elements into the new array. Unlike Array#flatten, this method does not flatten recursively by default. If the optional level argument determines the … Read more
This snippet calculate md5 for any given string public String md5(String s) { try { // Create MD5 Hash MessageDigest digest = java.security.MessageDigest.getInstance(“MD5”); digest.update(s.getBytes()); byte messageDigest[] = digest.digest(); // Create Hex String StringBuffer hexString = new StringBuffer(); for (int i=0; i<messageDigest.length; i++) hexString.append(Integer.toHexString(0xFF & messageDigest[i])); return hexString.toString(); } catch (NoSuchAlgorithmException e) { e.printStackTrace(); } return … Read more
All numbers (when hashed) are still going to be the p lowest-order bits of k for 127 too. That is wrong (or I misunderstood..). k % 127 depends on all bits of k. k % 128 only depends on the 7 lowest bits. EDIT: If you have a perfect distribution between 1 and 10,000. 10,000 … Read more
Sets test for equality, and until there are new Python releases, the order in which they do this can differ based on the form you hand the values to the set being constructed, as I’ll show below. Since 0 == x is true and 0 == y is true, but x == y is false, … Read more
The point of a salt is to prevent attackers from amortizing the cost of a brute force attack across sites (or better yet, when using a different salt for each user: all users of a site) through precomputed rainbow tables. With plain hashing, an attacker can compute such a table once (a very long, costly … Read more
This works for me $(‘ul.questions li a’).click(function(event) { event.preventDefault(); $(‘.tab’).hide(); window.location.hash = this.hash; $($(this).attr(‘href’)).fadeIn(‘slow’); }); Check here http://jsbin.com/edicu for a demo with almost identical code
Hashing is a function that applies to an arbitrary data and produces the data of a fixed size (mostly a very small size). There are many different types of hashes, but if we are talking about image hashing, it is used either to: find duplicates very fast. Almost any hash function will work. Instead of … Read more