mcrypt Library for PHP

This section describes the mcrypt library - encryption extension for PHP. mcrypt supports DES and many other encryption algorithms.

"mcrypt" is the suggested encryption extension for PHP. It supports a wide variety of block algorithms such as DES, TripleDES, Blowfish (default), 3-WAY, SAFER-SK64, SAFER-SK128, TWOFISH, TEA, RC2 and GOST in CBC, OFB, CFB and ECB cipher modes. See for details.

The best way to download and install "mcrypt" for your Windows system is to download the pre-compiled "mcrypt" version by the steps below:

1. Go to

2. Download the binary file, libmcrypt.dll, 19-Jan-2004 02:27, 163k.

3. Save libmcrypt.dll to your PHP directory, like \php\.

4. Open PHP initialization file, \php\php.ini.

5. Uncomment line "extension=php_mcrypt.dll".

You are ready to use "mcrypt" encryption functions.

Table of Contents

 About This Book

 Cryptography Terminology

 Cryptography Basic Concepts

 Introduction to AES (Advanced Encryption Standard)

 Introduction to DES Algorithm

 DES Algorithm - Illustrated with Java Programs

 DES Algorithm Java Implementation

 DES Algorithm - Java Implementation in JDK JCE

 DES Encryption Operation Modes

 DES in Stream Cipher Modes

PHP Implementation of DES - mcrypt

mcrypt Library for PHP

 mcrypt Encryption Functions

 mcrypt DES Encryption Testing Program

 Block Padding in mcrypt

 Blowfish - 8-Byte Block Cipher

 Secret Key Generation and Management

 Cipher - Secret Key Encryption and Decryption

 Introduction of RSA Algorithm

 RSA Implementation using java.math.BigInteger Class

 Introduction of DSA (Digital Signature Algorithm)

 Java Default Implementation of DSA

 Private key and Public Key Pair Generation

 PKCS#8/X.509 Private/Public Encoding Standards

 Cipher - Public Key Encryption and Decryption

 MD5 Mesasge Digest Algorithm

 SHA1 Mesasge Digest Algorithm

 OpenSSL Introduction and Installation

 OpenSSL Generating and Managing RSA Keys

 OpenSSL Managing Certificates

 OpenSSL Generating and Signing CSR

 OpenSSL Validating Certificate Path

 "keytool" and "keystore" from JDK

 "OpenSSL" Signing CSR Generated by "keytool"

 Migrating Keys from "keystore" to "OpenSSL" Key Files

 Certificate X.509 Standard and DER/PEM Formats

 Migrating Keys from "OpenSSL" Key Files to "keystore"

 Using Certificates in IE

 Using Certificates in Google Chrome

 Using Certificates in Firefox

 Outdated Tutorials


 Full Version in PDF/EPUB