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∟PHP Implementation of DES - mcrypt

∟mcrypt Encryption Functions

This section describes mcrypt encryption functions and 4 DES ciphers (operation modes) - 8-byte ECB, 8-byte CBC, 1-byte CFB, and 1-byte OFB ciphers.

"mcrypt" encryption extension offers the following main functions to perform an encryption operation:

• mcrypt_module_open() - Creates a resource handle for the specified encryption algorithm and operation mode.
• mcrypt_generic_init() - Initializes an encryption handle with a key and an initial vector.
• mcrypt_generic() - Encrypts a plaintext message with an initialized encryption handle.
• mcrypt_generic_deinit() - De-initializes an encryption handle.
• mcrypt_module_close() - Closes an encryption resource handle.

To specify the DES encryption algorithm for the mcrypt_module_open() function, you need to use the predefined constant: MCRYPT_DES.

To specify a DES operation mode for the mcrypt_module_open() function, you also need to use one of 4 predefined constants representing 4 4 DES operation modes supported in mcrypt:

• MCRYPT_MODE_ECB - The 64-bit ECB (Electronic CodeBook) operation mode.
• MCRYPT_MODE_CBC - The 64-bit CBC (Cipher Block Chaining) operation mode.
• MCRYPT_MODE_CFB - The 8-bit CFB (Cipher FeedBack) operation mode
• MCRYPT_MODE_OFB - The 8-bit OFB (Output FeedBack) operation mode

For example, if you want to create cipher resource handle to use DES 1-byte CFB operation mode, the function call should be: mcrypt_module_open(MCRYPT_DES, '', MCRYPT_MODE_CFB, '').

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

 Archived Tutorials

 References

 Full Version in PDF/EPUB

mcrypt Encryption Functions - Updated in 2023, by Herong Yang