JDK Tutorials - Herong's Tutorial Examples - Version 6.02, by Dr. Herong Yang

JDK Tutorials - Herong's Tutorial Examples

∟Cipher - Secret Key Encryption and Decryption

∟Blowfish and DES Secret Key Encryption Tests

Here is the result of my first test of JceSecretCipher.java with the Blowfish algorithm. It is done with JDK 1.8.

>java -cp . JceSecretCipher Blowfish encrypt bfish.key 
   JceSecretCipher.java jce.cph

KeySpec Object Info:
Saved File = bfish.key
Length = 7
toString = javax.crypto.spec.SecretKeySpec@2685020e

SecretKey Object Info:
Algorithm = Blowfish
toString = javax.crypto.spec.SecretKeySpec@2685020e

Cipher Object Info:
Block Size = 8
Algorithm = Blowfish
Provider = SunJCE version 1.8
toString = javax.crypto.Cipher@106082

Cipher Process Info:
Input Size = 3698
Output Size = 3704


>java -cp . JceSecretCipher Blowfish decrypt bfish.key jce.cph jce.clr

KeySpec Object Info:
Saved File = bfish.key
Length = 7
toString = javax.crypto.spec.SecretKeySpec@2685020e

SecretKey Object Info:
Algorithm = Blowfish
toString = javax.crypto.spec.SecretKeySpec@2685020e

Cipher Object Info:
Block Size = 8
Algorithm = Blowfish
Provider = SunJCE version 1.8
toString = javax.crypto.Cipher@106082

Cipher Process Info:
Input Size = 3704
Output Size = 3698

>comp JceSecretCipher.java jce.clr
Comparing JceSecretCipher.java and jce.clr...
Files compare OK

Note that:

• bfish.key is the key file generated by KeyGenerator with the Blowfish algorithm.
• The last command confirms that the encryption process and the decryption process work correctly.
• The block size of Blowfish encryption algorithm is 8 bytes.

You can do more tests with DES and HmacMD5 keys.

Last update: 2014.

Table of Contents

 About This JDK Tutorial Book

 Downloading and Installing JDK 1.8.0 on Windows

 Downloading and Installing JDK 1.7.0 on Windows

 Downloading and Installing JDK 1.6.2 on Windows

 Java Date-Time API

 Date, Time and Calendar Classes

 Date and Time Object and String Conversion

 Number Object and Numeric String Conversion

 Locales, Localization Methods and Resource Bundles

 Calling and Importing Classes Defined in Unnamed Packages

 HashSet, Vector, HashMap and Collection Classes

 Character Set Encoding Classes and Methods

 Character Set Encoding Maps

 Encoding Conversion Programs for Encoded Text Files

 Socket Network Communication

 Datagram Network Communication

 DOM (Document Object Model) - API for XML Files

 SAX (Simple API for XML)

 DTD (Document Type Definition) - XML Validation

 XSD (XML Schema Definition) - XML Validation

 XSL (Extensible Stylesheet Language)

 Message Digest Algorithm Implementations in JDK

 Private key and Public Key Pair Generation

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

 Digital Signature Algorithm and Sample Program

 "keytool" Commands and "keystore" Files

 KeyStore and Certificate Classes

 Secret Key Generation and Management

►Cipher - Secret Key Encryption and Decryption

 javax.crypto.Cipher - The Secret Key Encryption Class

 JceSecretCipher.java - Secret Key Encryption Sample Program

►Blowfish and DES Secret Key Encryption Tests

 JcePublicCipher.java - Private and Public Key Encryption

 DSA Public Key Encryption Tests

 RSA Public Key Encryption Tests

 The SSL (Secure Socket Layer) Protocol

 SSL Socket Communication Testing Programs

 SSL Client Authentication

 HTTPS (Hypertext Transfer Protocol Secure)

 Outdated Tutorials

 References

 PDF Printing Version

Blowfish and DES Secret Key Encryption Tests - Updated in 2017, by Dr. Herong Yang