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Generate Subject Hash of X509Certificate in Java

This generates a short 8 digit hash 1817886a There are two forms of this from OpenSSL: $ cd openssl-1.0.2-src $ grep -R X509_subject_name_hash * … crypto/x509/x509.h:unsigned long X509_subject_name_hash(X509 *x); crypto/x509/x509.h:unsigned long X509_subject_name_hash_old(X509 *x); crypto/x509/x509_cmp.c:unsigned long X509_subject_name_hash(X509 *x) crypto/x509/x509_cmp.c:unsigned long X509_subject_name_hash_old(X509 *x) … Generate Subject Hash of X509Certificate in Java… Here is the source for them … Read more

Why do hash keys have different order when printing?

When printing a hash there are a few different notions of order that are relevant: “insertion order”, “sort order” and “random”. See the ENVIRONMENT section of the perlrun documentation for a discussion of ways you can control this behavior and for the reasons why the default is to use hash randomization. For at least a … Read more

What decides the order of keys when I print a Perl hash?

Elements of a hash are printed out in their internal order, which can not be relied upon and will change as elements are added and removed. If you need all of the elements of a hash in some sort of order, sort the keys, and use that list to index the hash. If you are … Read more

Why doesn’t Perl’s each() iterate through the entire hash the second time?

each uses a pointer associated with the hash to keep track of iteration. It does not know that the first while is different from the second while loop, and it keeps the same pointer between them. Most people avoid each for this (and other) reasons, instead opting for keys: for my $key (keys %hash){ say … Read more

Compare two hex strings in Java?

The values 0..9 and A..F are in hex-digit order in the ASCII character set, so string1.compareTo(string2) should do the trick. Unless I’m missing something.

Good hashCode() Implementation

The value is not important, it can be whatever you want. Prime numbers will result in a better distribution of the hashCode values therefore they are preferred. You do not necessary have to add them, you are free to implement whatever algorithm you want, as long as it fulfills the hashCode contract: Whenever it is … Read more

SHA1 hashing in SQLite: how?

There is no such function built into SQLite3. But you could define a user function e.g. with sqlite3_create_function if you’re using the C interface, and implement SHA-1 with that. (But if you’re having a programmable interface perhaps you could just SHA-1 the password outside of the SQL engine.) You could also try to find / … Read more

GitHub source dynamic navigation

They blogged about it a while back: https://github.com/blog/760-the-tree-slider

Working with single page websites and maintaining state using a URL hash and jQuery

You make the anchor point to an internal link like so: <a href=”#graphicsDesign”>Graphics</a> And then simply make jQuery respond to the click event and let the browser follow the internal link naturally. The browser should now have the internal link in it’s address bar. You can use the following JavaScript to parse the URL and … Read more

Python: why can I put mutable object in a dict or set?

Python doesn’t test for mutable objects, it tests for hashable objects. Custom class instances are by default hashable. That’s fine because the default __eq__ implementation for such classes only tests for instance identity and the hash is based of the same information. In other words, it doesn’t matter that you alter the state of your … Read more