java.util.jar and cryptography

[telltera]

Hi All,


I am actually understanding the Android OS internals and I came across a part which needs to be clarified by Java people :)

The package installer of Android uses java.util.jar.JarFile class which verifies the signature on Android Application Package.

To understand this, I went to look up the java.util.jar.JarFile class which uses JarVerifier class to verify.

And here I got lost.

I don't see the cryptographic algorithms (RSA) called or the java JCE provider engine...

Can somebody suggest the flow, so I can understand.

Thanks.

[telltera]

Can anybody give me some inputs on this please??