Java class program cracking

Subaozi

<LicenseClassName> com. xxxx. yyyyy. nsc. license. NSCCompleteNodeLimitedLicense </licenseClassName>

Look at the snow to find, found that there are 2 decompilation program, dj decompilerhedecafe pro, but too lazy to open the virtual machine, with web, in the http://www.showmycode.com to upload the class file, it is solved. More java decompiler can access the http://www.program-transformation.org/Transform/JavaDecompilers, the comparison between them in the http://www.program-transformation.org/Transform/JavaDecompilerTests looks like the background is only jad and jode two.

Decompile all the lic-related code. grep looks at the md5-related content. The result is a little different from the imagination. the md5 words are not found in the decompiled code. It may be necessary to decompile the import items once. It is estimated that the md5 verification is in those places.

 

2011-08-21T07: 08: 27 A critical error occured during initialization: java. lang. SecurityException: MD5 digest error for license. dat
At sun. security. util. ManifestEntryVerifier. verify (Unknown Source)
At java. util. jar. JarVerifier. processEntry (Unknown Source)
At java. util. jar. JarVerifier. update (Unknown Source)
At java. util. jar. JarVerifier $ VerifierStream. read (Unknown Source)
At java. io. InputStream. read (Unknown Source)
At com. xxxxx. io. IOTools. pipeStream (Unknown Source)
At com. xxxxx. io. IOTools. pipeStream (Unknown Source)
At com. xxxxx. license. LicenseManager. A (Unknown Source)
At com. xxxxx. license. LicenseManager. getLicenseDescriptor (Unknown Source)
At com. xxxxx. license. LicenseManager. B (Unknown Source)
At com. xxxxx. license. LicenseManager. C (Unknown Source)
At com. xxxxx. license. LicenseManager. <init> (Unknown Source)
At com. xxxxx. yyyyyyy. nsc. NSC. o (Unknown Source)
At com. xxxxx. yyyyyyy. nsc. NSC .? (Unknown Source)
At com. xxxxx. yyyyyyy. nsc. NSC .? (Unknown Source)
At com. xxxxx. yyyyyyy. nsc. NSC. run (Unknown Source)
At com. xxxxx. yyyyyyy. nsc. NSC. main (Unknown Source)

2011-08-21T07: 08: 27 Error during server initialization: java. lang. NullPointerException
2011-08-21T07: 08: 27 java. lang. NullPointerException
At com. xxxxx. yyyyyyy. nsc. NSC .? (Unknown Source) www.2cto.com
At com. xxxxx. yyyyyyy. nsc. NSC. run (Unknown Source)
At com. xxxxx. yyyyyyy. nsc. NSC. main (Unknown Source)

2011-08-21T07: 08: 27 Shutting down immediately
2011-08-21T07: 08: 27 shutting down Asset Group Service Executor...
2011-08-21T07: 08: 27 shutting down data warehouse service
2011-08-21T07: 08: 27 shutting down config manager
2011-08-21T07: 08: 27 Error shutting down database: java. SQL. SQLException: No suitable driver
2011-08-21T07: 08: 27 shutting down logging