Clear unused warnings with MSVC

chacha.cpp

@@ -414,6 +414,7 @@ std::string ChaChaTLS_Policy::AlgorithmProvider() const
 void ChaChaTLS_Policy::CipherSetKey(const NameValuePairs &params, const byte *key, size_t length)
 {
     CRYPTOPP_ASSERT(key); CRYPTOPP_ASSERT(length == 32);
+    CRYPTOPP_UNUSED(length);
 
     // ChaChaTLS is always 20 rounds. Fetch Rounds() to avoid a spurious failure.
     int rounds = params.GetIntValueWithDefault(Name::Rounds(), ROUNDS);
@@ -509,6 +510,7 @@ std::string XChaCha20_Policy::AlgorithmProvider() const
 void XChaCha20_Policy::CipherSetKey(const NameValuePairs &params, const byte *key, size_t length)
 {
     CRYPTOPP_ASSERT(key); CRYPTOPP_ASSERT(length == 32);
+    CRYPTOPP_UNUSED(length);
 
     // Use previous rounds as the default value
     int rounds = params.GetIntValueWithDefault(Name::Rounds(), m_rounds);

poly1305.cpp

@@ -314,7 +314,7 @@ void Poly1305_Base<T>::Restart()
 
 void Poly1305TLS_Base::UncheckedSetKey(const byte *key, unsigned int length, const NameValuePairs &params)
 {
-	CRYPTOPP_UNUSED(params);
+	CRYPTOPP_UNUSED(params); CRYPTOPP_UNUSED(length);
 	CRYPTOPP_ASSERT(key && length >= 32);
 
 	// key is {r,s} pair. r is the additional key that gets clamped, s is the nonce.

xed25519.cpp

@@ -870,6 +870,7 @@ bool ed25519Verifier::VerifyAndRestart(PK_MessageAccumulator &messageAccumulator
 bool ed25519Verifier::VerifyStream(std::istream& stream, const byte *signature, size_t signatureLen) const
 {
     CRYPTOPP_ASSERT(signatureLen == SIGNATURE_LENGTH);
+    CRYPTOPP_UNUSED(signatureLen);
 
     const ed25519PublicKey& pk = static_cast<const ed25519PublicKey&>(GetPublicKey());
     int ret = Donna::ed25519_sign_open(stream, pk.GetPublicKeyBytePtr(), signature);