A way to encrypt with just a public key

[thasaleni]

Describe the bug it is normal for third parties to give you a public key to encrypt a file you will send to them, i.e: they don't give you anything else, and the key is not signed. Currently the library requires a recipient address (which if I understand correctly is to search for the public key?) But you don't really need to search as if you are given a public key file you will only have that public key in the file and nothing else. To Reproduce Steps to reproduce the behavior (code sample) Try and encrypt a file with just a unsigned public key, and no recipient address Expected behavior A clear and concise description of what you expected to happen. You should be able to encrypt a file with just the public key as available, official GPG tools can do that without any problem, but if you want to automate that with code this library constrains you

** System (please complete the following information):**

• Device: [e.g. iPhone6] Lenovo Thinkpad

• OS: [e.g. Linux] Windows 10

• Java [output of java -version] java version "1.8.0_231" Java(TM) SE Runtime Environment (build 1.8.0_231-b11) Java HotSpot(TM) 64-Bit Server VM (build 25.231-b11, mixed mode)

• Version [e.g. 2.2.0] 2.2.0 Additional context Add any other context about the problem here.

[ispringer]

See also #27, which I think would also cover this issue.