[crypto5]

I think standard Java library API doesn't know what algorithms are supported on particular platform, additionally you can implement your own messagedigest.

[dead10ck]

They list the algorithms explicitly here:

https://docs.oracle.com/javase/7/docs/api/java/security/Mess...

And here:

https://docs.oracle.com/javase/7/docs/technotes/guides/secur...

[AnimalMuppet]

Right - if I understand correctly, it can depend on what crypto packages are installed on your target.