Using MD5 Message Digest in PHP

Cryptography Tutorials - Herong's Tutorial Examples

∟MD5 Mesasge Digest Algorithm

∟Using MD5 Message Digest in PHP

This section provides a tutorial example on how to use MD5 message digest algorithm in PHP. The PHP engine has a built-in function md5().

If you are interested in using MD5 in PHP, you can use the built-in function md5(). Here is a sample program showing you how to use md5() function:

<?php 
# PhpMd5Test.php
# Copyright (c) HerongYang.com. All Rights Reserved.
# 
   $input = "";
   $output = md5($input);
   print("\n");
   print("MD5(\"".$input."\") =\n");
   print("   $output\n");

   $input = "abc";
   $output = md5($input);
   print("\n");
   print("MD5(\"".$input."\") =\n");
   print("   $output\n");

   $input = "abcdefghijklmnopqrstuvwxyz";
   $output = md5($input);
   print("\n");
   print("MD5(\"".$input."\") =\n");
   print("   $output\n");
?>

If you run this sample program with PHP 5, you should get:

MD5("") =
   d41d8cd98f00b204e9800998ecf8427e

MD5("abc") =
   900150983cd24fb0d6963f7d28e17f72
   
MD5("abcdefghijklmnopqrstuvwxyz") =
   c3fcd3d76192e4007dfb496cca67e13b

The output matches the testing result listed in RFC 1321.

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

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

What Is MD5 Message Digest Algorithm?

MD5 Message Digest Algorithm Overview

Using MD5 Message Digest in Java

►Using MD5 Message Digest in PHP

Using MD5 Message Digest in Perl

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

Archived Tutorials

Full Version in PDF/EPUB