Building a simple Node.js crypto hash server

The Crypto module is one of the important modules available for Node.js, and allows you to use it for encrypting content, creating digests and creating public-key signatures. In this post we will work with creating a simple message digest from some given content. Here we will create a Node.js server that responds with a cryptographic hash for the content provided. e.g if we query with the following url, passing the text helloworld and the hash function name md5 the server will return the digest of the text. Note that the crypto module requires OpenSSL to be available on the underlying platform. Although a toy program, this is an exercise in using the ‘crypto’ and ‘querystring’ modules.
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Encrypting uploaded files in PHP

During a recent project, the client requested that uploaded files be encrypted for security reasons. As I already had the uploaded code ready and tested I just needed to add some extra encryption capability to the code. As earlier I’d encountered Zends wonderful Zend_Filter class, I decided to go with it and use the Zend_Filter_Encrypt and Zend_Filter_Decrypt to accomplish the work. The Zend_Filter component provides a set of common useful data filters, among which are the encryption filters. Although my project was not developed in Zend, I could easily integrate the required classes in the code. Note that Zend has a great upload library, Zend_File_Transfer, that lets you easily manage file uploading and also encryption, but as I already had the upload code tested, I decided to just add the encryption part.
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