NewHope Java Port
This directory contains a straight Java translation of the original reference C code from here, github.
Classes
There are four classes in the org.pqcrypto.newhope package:
- NewHope - Main API for the Java implementation of New Hope.
- NewHopeTor - Main API for the "torref" variant of New Hope.
- NewHopeTest - Some test cases to verify the implementation.
- NewHopeTorTest - Some test cases to verify the "torref" implementation.
Only the NewHope class (and optionally the NewHopeTor class) needs to be imported into a user application. The NewHopeTest and NewHopeTorTest classes are not needed except for verification.
Using the Java Port
Using the NewHope class is pretty straight-forward:
import org.pqcrypto.newhope.NewHope;
// Generate the private and public keys for Alice.
NewHope alice = new NewHope();
byte[] senda = new byte [NewHope.SENDABYTES];
alice.keygen(senda, 0);
// Generate the public key and shared secret for Bob.
NewHope bob = new NewHope();
byte[] sendb = new byte [NewHope.SENDBBYTES];
byte[] key_b = new byte [NewHope.SHAREDBYTES];
bob.sharedb(key_b, 0, sendb, 0, senda, 0);
// Generate the shared secret for Alice.
byte[] key_a = new byte [NewHope.SHAREDBYTES];
alice.shareda(key_a, 0, sendb, 0);
The 0 values in the code above are offsets into the respective arrays in case you need to write the key values to somewhere else in the caller-supplied buffers.
The NewHopeTest class provides some more examples.
Random Number Generation
The NewHope class uses the Java standard SecureRandom class to generate random numbers. If this isn't good enough, then the randombytes() method can be overridden in a subclass to provide an alternative source of random numbers. This can also be used to provide a static source of random numbers for test vectors (as is done in NewHopeTest).
License
Public domain, same as the original C code.