Fix unused parameter in crypto backend handlers.

lib/crypto_backend/argon2_generic.c

@@ -29,14 +29,12 @@
 
 #define CONST_CAST(x) (x)(uintptr_t)
 
+#if USE_INTERNAL_ARGON2 || HAVE_ARGON2_H
 int argon2(const char *type, const char *password, size_t password_length,
 	   const char *salt, size_t salt_length,
 	   char *key, size_t key_length,
 	   uint32_t iterations, uint32_t memory, uint32_t parallel)
 {
-#if !USE_INTERNAL_ARGON2 && !HAVE_ARGON2_H
-	return -EINVAL;
-#else
 	argon2_type atype;
 	argon2_context context = {
 		.flags = ARGON2_DEFAULT_FLAGS,
@@ -75,5 +73,17 @@ int argon2(const char *type, const char *password, size_t password_length,
 	}
 
 	return r;
-#endif
 }
+
+#else /* USE_INTERNAL_ARGON2 || HAVE_ARGON2_H */
+#pragma GCC diagnostic ignored "-Wunused-parameter"
+
+int argon2(const char *type, const char *password, size_t password_length,
+	   const char *salt, size_t salt_length,
+	   char *key, size_t key_length,
+	   uint32_t iterations, uint32_t memory, uint32_t parallel)
+{
+	return -EINVAL;
+}
+
+#endif

lib/crypto_backend/crypto_cipher_kernel.c

@@ -312,6 +312,8 @@ int crypt_bitlk_decrypt_key_kernel(const void *key, size_t key_length,
 }
 
 #else /* ENABLE_AF_ALG */
+#pragma GCC diagnostic ignored "-Wunused-parameter"
+
 int crypt_cipher_init_kernel(struct crypt_cipher_kernel *ctx, const char *name,
 			     const char *mode, const void *key, size_t key_length)
 {

lib/crypto_backend/crypto_openssl.c

@@ -57,6 +57,7 @@ static uint64_t OSSL_get_max_threads(OSSL_LIB_CTX *ctx __attribute__((unused)))
 #endif
 
 #define CONST_CAST(x) (x)(uintptr_t)
+#define UNUSED(x) (void)(x)
 
 static int crypto_backend_initialised = 0;
 
@@ -207,6 +208,8 @@ static int openssl_backend_init(bool fips)
 		openssl_backend_exit();
 		return -EINVAL;
 	}
+#else
+	UNUSED(fips);
 #endif
 	return 0;
 }
@@ -297,6 +300,8 @@ static void hash_id_free(const EVP_MD *hash_id)
 {
 #if OPENSSL_VERSION_MAJOR >= 3
 	EVP_MD_free(CONST_CAST(EVP_MD*)hash_id);
+#else
+	UNUSED(hash_id);
 #endif
 }
 
@@ -313,6 +318,8 @@ static void cipher_type_free(const EVP_CIPHER *cipher_type)
 {
 #if OPENSSL_VERSION_MAJOR >= 3
 	EVP_CIPHER_free(CONST_CAST(EVP_CIPHER*)cipher_type);
+#else
+	UNUSED(cipher_type);
 #endif
 }