PHP provides the popular md5() hash function out of the box, which returns 32 a hex character string. It’s a great way to generate a fingerprint for any arbitrary length string. But what if you need to generate an integer fingerprint out of a URL?

64-bit Download Windows 7

Windows 7 Product Key Generator Full Download 32-64 Bit by Leave a Comment Windows 7 Product Key Generator is fixed the most favorite operating system because of its excellent feature-wealthy environment, impressive start menu and most importantly its user-friendly interface, which makes it unique Windows operating system out there. An important thing to remember is that if you change the primary key in the policy, any Shared Access Signatures created from it is invalidated. Related Articles Is this page helpful?

Challenge

64-bit Java

• AutoCAD 2013 Key Generator AutoCAD 2013 Key Generator is premium keygen which can generate unlimited number of unique keys for your software. This is a best key generator tool for activating software. Using this best tool you can activate all premium features of AutoCAD 2013.One best thing about this AutoCAD 2013 Key Generator is that you can use it much time when you want and when.
• From PHP 7.1 rand is documented as an alias of mtrand. Actually, if they are called with two arguments where the second is smaller than the first, their output differs.
• RandomKeygen is a free mobile-friendly tool that offers randomly generated keys and passwords you can use to secure any application, service or device. KEY RandomKeygen - The Secure Password & Keygen Generator.
• Also if you are looking for a way to reduce collisions and still keep the hash result small (smaller than say md5) you could get a nice database friendly 64 bit value by using hash/crc32 and hash/crc32b, which is slower than a single md5 but the result may be more suitable for certain tasks.
• Generates an arbitrary length string of cryptographic random bytes that are suitable for cryptographic use, such as when generating salts, keys or initialization vectors.

We faced that challenge in RatingWidget when we had to bind our rating widgets to a unique Int64 IDs based on the website’s page it’s being loaded from. Theoretically we could just store the URLs and query the URL column, but URLs can be very long and creating an index for text column with unknown length is very inefficient.

So if you are working on any kind of dynamic widget development that should load different data based on the URL it’s loaded from, this post will save you tonnes of time.

To simplify the problem, let’s divide it into two sub-challenges:

1. URL Canonization
2. String to unique Int64 conversion

URL Canonization

In our case, we wanted to assign a unique Int64 for a page, not for a URL. For instance, http://domain.com?x=1&y=2 and http://domain.com?y=2&x=1 are different URLs but in fact both of them will load the exact same page. Therefore, we wanted to assign them an identical Int64 ID. Thus, by canonizing the URLs before mapping them to Int64, we can convert the URLs to uniform representation.

Basically what this code does is reorder the query string parameters by lexicographical order, and slightly tweak the URL encoding based on RFC 3986 URI syntax standard, to compensate for the different browsers + server URL encoding inconsistency.

Notes:

1. In our case canonizeUrl, the canonization function, gets rid of the protocol. So https://domain.com and http://domain.com are both canonized to domain.com because we wanted to show the same rating widget on HTTP and HTTPS equivalent pages.
2. As you can notice, we also ignore everything the after hashmark fragment. Therefore, if you would like to generate unique IDs for SPA (Single Page Application) different states like http://my-spa.com/#state1 and http://my-spa.com/#state2, the URL canonization function has to be modified to support that.

Converting String to unique Int64 ID for MySql BIGINT Indexed Column

After fooling around with various bit conversion functions like bindec(), decbin(), base_convert(). We have found out that 64 bit integers and PHP are not playing well. None of the mentioned functions consistently supports 64 bit. After digging around on Google, we were lead to a post about 32 bit limitations in PHP which included the suggestion to use GMP, a really cool library for multiple precision integers. Using this library, we managed to create this one line hash function that generates a 64 bit integer out of arbitrary length string.

Post factum, we could have implemented the CRC64 algorithm which generates a string checksum and should perform faster than MD5. But the advantage of the technique we’ve used over CRC is that we’ve created a one-way-hash function, so we can reuse it for various cryptography purposes in the code.

Generate bitlocker recovery key windows 10. To find out more about GMP, see here.

Grand Finale

Combining the URL canonization with the String to Int64 mapping, the final solution looks like this:

Generate 64 Bit Key Php Download

Collision and Performance Test of get64BitHash

Platform: Intel i3, Windows 7 64 bit, PHP 5.3
Iterations: 10,000,000 Times generated get64BitHash
Elapsed Time: 460 millisecond for every 100,000 generations
Collision: Not found

Summary

Generate 64 Bit Key Php Free

I hope this straightforward solution will save you time on your next project. If you have comments or any additional use-cases where this technique can be applied, please feel free to comment below.