javax.crypto.KeyGenerator - Generating Secret Keys

This section provides a quick introduction of the secret key generation class, javax.crypto.KeyGenerator.

To generate secret keys, I need to learn the javax.crypto.KeyGenerator class.

javax.crypto.KeyGenerator is an abstract class providing a link to implementation classes of secret key generration algorithms provided by various security package providers. Major methods in the KeyGenerator class:

getInstance() - Returns a KeyGenerator object of the specified algorithm from the implementation of the specified provider. If provider is not specified, the default implementation is used. This is a static method.

init() - Initializes this key generator with the specified key size.

generateKey() - Generates a key and returns it as a SecretKey object.

getAlgorithm() - Returns the algorithm name of this generator.

getProvider() - Returns the provider as a Provider object of this generator.

Steps of generating a secret key of a given algorithm are:

      KeyGenerator kg = KeyGenerator.getInstance(algorithm);
      kg.init(keySize);
      SecretKey ky = kg.generateKey();

See next sections for a sample program on how to use the KeyGenerator class.

Last update: 2013.

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

 javax.crypto.SecretKey - The Secret Key Interface

javax.crypto.KeyGenerator - Generating Secret Keys

 Converting Secret Keys to and from Byte Arrays

 JceSecretKeyTest.java - Secret Key Test Program

 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 (Internet Explorer)

 Using Certificates in Firefox

 Using Certificates in Google Chrome

 Outdated Tutorials

 References

 PDF Printing Version