JDK (Java Development Kit) Tutorials

∟Cipher - Secret Key Encryption and Decryption

∟Blowfish and DES Secret Key Encryption Tests

This section provides a tutorial example on how to write a secret key encryption and description program using the javax.crypto.Cipher class.

Here is the result of my first test of JceSecretCipher.java with the Blowfish algorithm. It is done with JDK 1.4.1.

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 1.4
toString = javax.crypto.Cipher@106082

Cipher Process Info:
Input Size = 3684
Output Size = 3688

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 1.4
toString = javax.crypto.Cipher@106082

Cipher Process Info:
Input Size = 3688
Output Size = 3684

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: 2006.

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 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

 The SSL (Secure Socket Layer) Protocol

 SSL Socket Communication Testing Programs

 SSL Client Authentication

 HTTPS (Hypertext Transfer Protocol Secure)

 References

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