code: public static final void keygen(byte[] P, byte[] s, byte[] k) {
  		clamp(k);
  		core(P, s, k, null);
  	}
docs: /* Key-pair generation
  P  [out] your public key
  s  [out] your private key for signing
  k  [out] your private key for key agreement
  k  [in]  32 random bytes
  s may be NULL if you don't care
  
  WARNING: if s is not NULL, this function has data-dependent timing