Can I get the type or fingerprint of a locked SSH private key without unlocking it using JSch?

Issue

Can I get the type (RSA, DSA, ECDSA, ED25519...) or the fingerprint of a passphrase protected private ssh key without unlocking it with JSch (like you can in Linux with ssh-keygen -l -f <key_file>)?

I'm writing an Android app and JSch is pretty much the only lib that I managed to get to work with Android so it has to be done with JSch or manually.

Solution

Use KeyPair.load to load the key.

And then KeyPair.getKeyType and KeyPair.getFingerPrint to access its properties.

JSch jSch = new JSch();
KeyPair keypair = KeyPair.load(jSch, filename);
System.out.println(keypair.getKeyType());
System.out.println(keypair.getFingerPrint(jSch));

Answered By - Martin Prikryl