It has been noted by many well respected developers such as Brian Goetz and Josh Bloch that : If an object’s hashCode() value can change based on its state, then we must be careful when using such objects as keys in hash-based collections to ensure that we don’t allow their state to change when they … Read more
Actually this is kind of strange, with the string conversions – which the membership provider does to put them into config files. Hashes and salts are binary blobs, you don’t need to convert them to strings unless you want to put them into text files. In my book, Beginning ASP.NET Security, (oh finally, an excuse … Read more
I solve this by SQL command: ALTER USER ‘mysqlUsername’@’localhost’ IDENTIFIED WITH mysql_native_password BY ‘mysqlUsernamePassword’; which is referenced by https://dev.mysql.com/doc/refman/8.0/en/alter-user.html if you are creating new user CREATE USER ‘jeffrey’@’localhost’ IDENTIFIED WITH mysql_native_password BY ‘password’; which is referenced by https://dev.mysql.com/doc/refman/8.0/en/create-user.html this works for me
Hashing is a one way function (well, a mapping). It’s irreversible, you apply the secure hash algorithm and you cannot get the original string back. The most you can do is to generate what’s called “a collision”, that is, finding a different string that provides the same hash. Cryptographically secure hash algorithms are designed to … Read more
The best implementation? That is a hard question because it depends on the usage pattern. A for nearly all cases reasonable good implementation was proposed in Josh Bloch‘s Effective Java in Item 8 (second edition). The best thing is to look it up there because the author explains there why the approach is good. A … Read more
String.prototype.hashCode = function() { var hash = 0, i, chr; if (this.length === 0) return hash; for (i = 0; i < this.length; i++) { chr = this.charCodeAt(i); hash = ((hash << 5) – hash) + chr; hash |= 0; // Convert to 32bit integer } return hash; }; Source: http://werxltd.com/wp/2010/05/13/javascript-implementation-of-javas-string-hashcode-method/
According to Joshua Bloch’s Effective Java (a book that can’t be recommended enough, and which I bought thanks to continual mentions on stackoverflow): The value 31 was chosen because it is an odd prime. If it were even and the multiplication overflowed, information would be lost, as multiplication by 2 is equivalent to shifting. The … Read more
To be able to use std::unordered_map (or one of the other unordered associative containers) with a user-defined key-type, you need to define two things: A hash function; this must be a class that overrides operator() and calculates the hash value given an object of the key-type. One particularly straight-forward way of doing this is to … Read more
How can I generate an MD5 hash in Java?
First, note that this behavior applies to any default value that is subsequently mutated (e.g. hashes and strings), not just arrays. It also applies similarly to the populated elements in Array.new(3) { [] }. TL;DR: Use Hash.new { |h, k| h[k] = [] } if you want the most idiomatic solution and don’t care why. … Read more