Add SUPERCOP to references

src/main/java/swiss/qpq/gajumaru/core/crypto/Ed25519.java

@@ -34,9 +34,11 @@ import swiss.qpq.gajumaru.core.tools.CryptoUtils;
 // References:
 // I don't even know where to start with references, but the tink-java library and pretty much
 // everything (and everyone!) referenced on the lib25519 page deserves a mention.
+// Of special mention, of course, is SUPERCOP.
 // 
 // tink-java: https://github.com/tink-crypto/tink-java
-// lib25519: https://lib25519.cr.yp.to/people.html
+// lib25519 : https://lib25519.cr.yp.to/people.html
+// SUPERCOP : https://bench.cr.yp.to/supercop.html
 
 // TODO: Craig 2026-08-21
 //  I don't like the allocation of Scratch and Ge all over the place.