restore shared secret benchmarks

src/gen_headers/crypto_hxx.py

@@ -63,7 +63,7 @@ public:
     /** @brief Serialization size. */
     inline size_t serSize() const NOEXCEPT { return SER_BYTES; }
     
-    /* TODO: verify_strobe? */
+    /* TODO: verify_strobe */
     
     /** @brief Verify a message */
     inline void verify(

test/bench_decaf.cxx

@@ -290,10 +290,10 @@ static void macro() {
     printf("\nMacro-benchmarks for %s:\n", Group::name());
     printf("Crypto benchmarks:\n");
     SpongeRng rng(Block("macro rng seed"));
-    PublicKey<Group> p1((NOINIT())), p2((NOINIT()));
-    PrivateKey<Group> s1((NOINIT())), s2((NOINIT()));
+    PrivateKey<Group> s1((NOINIT())), s2(rng);
+    PublicKey<Group> p1((NOINIT())), p2(s2);
 
-    SecureBuffer message = rng.read(5), sig;
+    SecureBuffer message = rng.read(5), sig, ss;
 
     for (Benchmark b("Create private key",1); b.iter(); ) {
         s1 = PrivateKey<Group>(rng);
@@ -310,6 +310,10 @@ static void macro() {
         try { p1.verify(message, sig); } catch (CryptoException) {}
     }
     
+    for (Benchmark b("SharedSecret",1); b.iter(); ) {
+        ss = s1.sharedSecret(p2,32,true);
+    }
+    
     printf("\nProtocol benchmarks:\n");
     SpongeRng clientRng(Block("client rng seed"));
     SpongeRng serverRng(Block("server rng seed"));

test/test_decaf.cxx

@@ -335,7 +335,15 @@ static void test_crypto() {
         
         SecureBuffer message = rng.read(i);
         SecureBuffer sig(priv1.sign(message));
+
         pub1.verify(message, sig);
+        
+        SecureBuffer s1(priv1.sharedSecret(pub2,32,true));
+        SecureBuffer s2(priv2.sharedSecret(pub1,32,false));
+        if (memcmp(s1.data(),s2.data(),s1.size())) {
+            test.fail();
+            printf("    Shared secrets disagree.");
+        }
     }
 }