artem-smotrakov commented on a change in pull request #113: TLS improvements
URL: 
https://github.com/apache/httpcomponents-core/pull/113#discussion_r264411073
 
 

 ##########
 File path: httpcore5/src/main/java/org/apache/hc/core5/http/ssl/TlsCiphers.java
 ##########
 @@ -0,0 +1,374 @@
+/*
+ * ====================================================================
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ * ====================================================================
+ *
+ * This software consists of voluntary contributions made by many
+ * individuals on behalf of the Apache Software Foundation.  For more
+ * information on the Apache Software Foundation, please see
+ * <http://www.apache.org/>.
+ *
+ */
+
+package org.apache.hc.core5.http.ssl;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+import java.util.regex.Pattern;
+
+/**
+ * TLS cipher suite support methods
+ *
+ * @since 5.0
+ */
+public final class TlsCiphers {
+
+    private final static Set<String> H2_BLACKLISTED =
+            Collections.unmodifiableSet(new HashSet<>(Arrays.asList(
+                    "TLS_NULL_WITH_NULL_NULL",
+                    "TLS_RSA_WITH_NULL_MD5",
+                    "TLS_RSA_WITH_NULL_SHA",
+                    "TLS_RSA_EXPORT_WITH_RC4_40_MD5",
+                    "TLS_RSA_WITH_RC4_128_MD5",
+                    "TLS_RSA_WITH_RC4_128_SHA",
+                    "TLS_RSA_EXPORT_WITH_RC2_CBC_40_MD5",
+                    "TLS_RSA_WITH_IDEA_CBC_SHA",
+                    "TLS_RSA_EXPORT_WITH_DES40_CBC_SHA",
+                    "TLS_RSA_WITH_DES_CBC_SHA",
+                    "TLS_RSA_WITH_3DES_EDE_CBC_SHA",
+                    "TLS_DH_DSS_EXPORT_WITH_DES40_CBC_SHA",
+                    "TLS_DH_DSS_WITH_DES_CBC_SHA",
+                    "TLS_DH_DSS_WITH_3DES_EDE_CBC_SHA",
+                    "TLS_DH_RSA_EXPORT_WITH_DES40_CBC_SHA",
+                    "TLS_DH_RSA_WITH_DES_CBC_SHA",
+                    "TLS_DH_RSA_WITH_3DES_EDE_CBC_SHA",
+                    "TLS_DHE_DSS_EXPORT_WITH_DES40_CBC_SHA",
+                    "TLS_DHE_DSS_WITH_DES_CBC_SHA",
+                    "TLS_DHE_DSS_WITH_3DES_EDE_CBC_SHA",
+                    "TLS_DHE_RSA_EXPORT_WITH_DES40_CBC_SHA",
+                    "TLS_DHE_RSA_WITH_DES_CBC_SHA",
+                    "TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA",
+                    "TLS_DH_anon_EXPORT_WITH_RC4_40_MD5",
+                    "TLS_DH_anon_WITH_RC4_128_MD5",
+                    "TLS_DH_anon_EXPORT_WITH_DES40_CBC_SHA",
+                    "TLS_DH_anon_WITH_DES_CBC_SHA",
+                    "TLS_DH_anon_WITH_3DES_EDE_CBC_SHA",
+                    "TLS_KRB5_WITH_DES_CBC_SHA",
+                    "TLS_KRB5_WITH_3DES_EDE_CBC_SHA",
+                    "TLS_KRB5_WITH_RC4_128_SHA",
+                    "TLS_KRB5_WITH_IDEA_CBC_SHA",
+                    "TLS_KRB5_WITH_DES_CBC_MD5",
+                    "TLS_KRB5_WITH_3DES_EDE_CBC_MD5",
+                    "TLS_KRB5_WITH_RC4_128_MD5",
+                    "TLS_KRB5_WITH_IDEA_CBC_MD5",
+                    "TLS_KRB5_EXPORT_WITH_DES_CBC_40_SHA",
+                    "TLS_KRB5_EXPORT_WITH_RC2_CBC_40_SHA",
+                    "TLS_KRB5_EXPORT_WITH_RC4_40_SHA",
+                    "TLS_KRB5_EXPORT_WITH_DES_CBC_40_MD5",
+                    "TLS_KRB5_EXPORT_WITH_RC2_CBC_40_MD5",
+                    "TLS_KRB5_EXPORT_WITH_RC4_40_MD5",
+                    "TLS_PSK_WITH_NULL_SHA",
+                    "TLS_DHE_PSK_WITH_NULL_SHA",
+                    "TLS_RSA_PSK_WITH_NULL_SHA",
+                    "TLS_RSA_WITH_AES_128_CBC_SHA",
+                    "TLS_DH_DSS_WITH_AES_128_CBC_SHA",
+                    "TLS_DH_RSA_WITH_AES_128_CBC_SHA",
+                    "TLS_DHE_DSS_WITH_AES_128_CBC_SHA",
+                    "TLS_DHE_RSA_WITH_AES_128_CBC_SHA",
+                    "TLS_DH_anon_WITH_AES_128_CBC_SHA",
+                    "TLS_RSA_WITH_AES_256_CBC_SHA",
+                    "TLS_DH_DSS_WITH_AES_256_CBC_SHA",
+                    "TLS_DH_RSA_WITH_AES_256_CBC_SHA",
+                    "TLS_DHE_DSS_WITH_AES_256_CBC_SHA",
+                    "TLS_DHE_RSA_WITH_AES_256_CBC_SHA",
+                    "TLS_DH_anon_WITH_AES_256_CBC_SHA",
+                    "TLS_RSA_WITH_NULL_SHA256",
+                    "TLS_RSA_WITH_AES_128_CBC_SHA256",
+                    "TLS_RSA_WITH_AES_256_CBC_SHA256",
+                    "TLS_DH_DSS_WITH_AES_128_CBC_SHA256",
+                    "TLS_DH_RSA_WITH_AES_128_CBC_SHA256",
+                    "TLS_DHE_DSS_WITH_AES_128_CBC_SHA256",
+                    "TLS_RSA_WITH_CAMELLIA_128_CBC_SHA",
+                    "TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA",
+                    "TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA",
+                    "TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA",
+                    "TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA",
+                    "TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA",
+                    "TLS_DHE_RSA_WITH_AES_128_CBC_SHA256",
+                    "TLS_DH_DSS_WITH_AES_256_CBC_SHA256",
+                    "TLS_DH_RSA_WITH_AES_256_CBC_SHA256",
+                    "TLS_DHE_DSS_WITH_AES_256_CBC_SHA256",
+                    "TLS_DHE_RSA_WITH_AES_256_CBC_SHA256",
+                    "TLS_DH_anon_WITH_AES_128_CBC_SHA256",
+                    "TLS_DH_anon_WITH_AES_256_CBC_SHA256",
+                    "TLS_RSA_WITH_CAMELLIA_256_CBC_SHA",
+                    "TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA",
+                    "TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA",
+                    "TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA",
+                    "TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA",
+                    "TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA",
+                    "TLS_PSK_WITH_RC4_128_SHA",
+                    "TLS_PSK_WITH_3DES_EDE_CBC_SHA",
+                    "TLS_PSK_WITH_AES_128_CBC_SHA",
+                    "TLS_PSK_WITH_AES_256_CBC_SHA",
+                    "TLS_DHE_PSK_WITH_RC4_128_SHA",
+                    "TLS_DHE_PSK_WITH_3DES_EDE_CBC_SHA",
+                    "TLS_DHE_PSK_WITH_AES_128_CBC_SHA",
+                    "TLS_DHE_PSK_WITH_AES_256_CBC_SHA",
+                    "TLS_RSA_PSK_WITH_RC4_128_SHA",
+                    "TLS_RSA_PSK_WITH_3DES_EDE_CBC_SHA",
+                    "TLS_RSA_PSK_WITH_AES_128_CBC_SHA",
+                    "TLS_RSA_PSK_WITH_AES_256_CBC_SHA",
+                    "TLS_RSA_WITH_SEED_CBC_SHA",
+                    "TLS_DH_DSS_WITH_SEED_CBC_SHA",
+                    "TLS_DH_RSA_WITH_SEED_CBC_SHA",
+                    "TLS_DHE_DSS_WITH_SEED_CBC_SHA",
+                    "TLS_DHE_RSA_WITH_SEED_CBC_SHA",
+                    "TLS_DH_anon_WITH_SEED_CBC_SHA",
+                    "TLS_RSA_WITH_AES_128_GCM_SHA256",
+                    "TLS_RSA_WITH_AES_256_GCM_SHA384",
+                    "TLS_DH_RSA_WITH_AES_128_GCM_SHA256",
+                    "TLS_DH_RSA_WITH_AES_256_GCM_SHA384",
+                    "TLS_DH_DSS_WITH_AES_128_GCM_SHA256",
+                    "TLS_DH_DSS_WITH_AES_256_GCM_SHA384",
+                    "TLS_DH_anon_WITH_AES_128_GCM_SHA256",
+                    "TLS_DH_anon_WITH_AES_256_GCM_SHA384",
+                    "TLS_PSK_WITH_AES_128_GCM_SHA256",
+                    "TLS_PSK_WITH_AES_256_GCM_SHA384",
+                    "TLS_RSA_PSK_WITH_AES_128_GCM_SHA256",
+                    "TLS_RSA_PSK_WITH_AES_256_GCM_SHA384",
+                    "TLS_PSK_WITH_AES_128_CBC_SHA256",
+                    "TLS_PSK_WITH_AES_256_CBC_SHA384",
+                    "TLS_PSK_WITH_NULL_SHA256",
+                    "TLS_PSK_WITH_NULL_SHA384",
+                    "TLS_DHE_PSK_WITH_AES_128_CBC_SHA256",
+                    "TLS_DHE_PSK_WITH_AES_256_CBC_SHA384",
+                    "TLS_DHE_PSK_WITH_NULL_SHA256",
+                    "TLS_DHE_PSK_WITH_NULL_SHA384",
+                    "TLS_RSA_PSK_WITH_AES_128_CBC_SHA256",
+                    "TLS_RSA_PSK_WITH_AES_256_CBC_SHA384",
+                    "TLS_RSA_PSK_WITH_NULL_SHA256",
+                    "TLS_RSA_PSK_WITH_NULL_SHA384",
+                    "TLS_RSA_WITH_CAMELLIA_128_CBC_SHA256",
+                    "TLS_DH_DSS_WITH_CAMELLIA_128_CBC_SHA256",
+                    "TLS_DH_RSA_WITH_CAMELLIA_128_CBC_SHA256",
+                    "TLS_DHE_DSS_WITH_CAMELLIA_128_CBC_SHA256",
+                    "TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA256",
+                    "TLS_DH_anon_WITH_CAMELLIA_128_CBC_SHA256",
+                    "TLS_RSA_WITH_CAMELLIA_256_CBC_SHA256",
+                    "TLS_DH_DSS_WITH_CAMELLIA_256_CBC_SHA256",
+                    "TLS_DH_RSA_WITH_CAMELLIA_256_CBC_SHA256",
+                    "TLS_DHE_DSS_WITH_CAMELLIA_256_CBC_SHA256",
+                    "TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA256",
+                    "TLS_DH_anon_WITH_CAMELLIA_256_CBC_SHA256",
+                    "TLS_EMPTY_RENEGOTIATION_INFO_SCSV",
+                    "TLS_ECDH_ECDSA_WITH_NULL_SHA",
+                    "TLS_ECDH_ECDSA_WITH_RC4_128_SHA",
+                    "TLS_ECDH_ECDSA_WITH_3DES_EDE_CBC_SHA",
+                    "TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA",
+                    "TLS_ECDH_ECDSA_WITH_AES_256_CBC_SHA",
+                    "TLS_ECDHE_ECDSA_WITH_NULL_SHA",
+                    "TLS_ECDHE_ECDSA_WITH_RC4_128_SHA",
+                    "TLS_ECDHE_ECDSA_WITH_3DES_EDE_CBC_SHA",
+                    "TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA",
+                    "TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA",
+                    "TLS_ECDH_RSA_WITH_NULL_SHA",
+                    "TLS_ECDH_RSA_WITH_RC4_128_SHA",
+                    "TLS_ECDH_RSA_WITH_3DES_EDE_CBC_SHA",
+                    "TLS_ECDH_RSA_WITH_AES_128_CBC_SHA",
+                    "TLS_ECDH_RSA_WITH_AES_256_CBC_SHA",
+                    "TLS_ECDHE_RSA_WITH_NULL_SHA",
+                    "TLS_ECDHE_RSA_WITH_RC4_128_SHA",
+                    "TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA",
+                    "TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA",
+                    "TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA",
+                    "TLS_ECDH_anon_WITH_NULL_SHA",
+                    "TLS_ECDH_anon_WITH_RC4_128_SHA",
+                    "TLS_ECDH_anon_WITH_3DES_EDE_CBC_SHA",
+                    "TLS_ECDH_anon_WITH_AES_128_CBC_SHA",
+                    "TLS_ECDH_anon_WITH_AES_256_CBC_SHA",
+                    "TLS_SRP_SHA_WITH_3DES_EDE_CBC_SHA",
+                    "TLS_SRP_SHA_RSA_WITH_3DES_EDE_CBC_SHA",
+                    "TLS_SRP_SHA_DSS_WITH_3DES_EDE_CBC_SHA",
+                    "TLS_SRP_SHA_WITH_AES_128_CBC_SHA",
+                    "TLS_SRP_SHA_RSA_WITH_AES_128_CBC_SHA",
+                    "TLS_SRP_SHA_DSS_WITH_AES_128_CBC_SHA",
+                    "TLS_SRP_SHA_WITH_AES_256_CBC_SHA",
+                    "TLS_SRP_SHA_RSA_WITH_AES_256_CBC_SHA",
+                    "TLS_SRP_SHA_DSS_WITH_AES_256_CBC_SHA",
+                    "TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256",
+                    "TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384",
+                    "TLS_ECDH_ECDSA_WITH_AES_128_CBC_SHA256",
+                    "TLS_ECDH_ECDSA_WITH_AES_256_CBC_SHA384",
+                    "TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256",
+                    "TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384",
+                    "TLS_ECDH_RSA_WITH_AES_128_CBC_SHA256",
+                    "TLS_ECDH_RSA_WITH_AES_256_CBC_SHA384",
+                    "TLS_ECDH_ECDSA_WITH_AES_128_GCM_SHA256",
+                    "TLS_ECDH_ECDSA_WITH_AES_256_GCM_SHA384",
+                    "TLS_ECDH_RSA_WITH_AES_128_GCM_SHA256",
+                    "TLS_ECDH_RSA_WITH_AES_256_GCM_SHA384",
+                    "TLS_ECDHE_PSK_WITH_RC4_128_SHA",
+                    "TLS_ECDHE_PSK_WITH_3DES_EDE_CBC_SHA",
+                    "TLS_ECDHE_PSK_WITH_AES_128_CBC_SHA",
+                    "TLS_ECDHE_PSK_WITH_AES_256_CBC_SHA",
+                    "TLS_ECDHE_PSK_WITH_AES_128_CBC_SHA256",
+                    "TLS_ECDHE_PSK_WITH_AES_256_CBC_SHA384",
+                    "TLS_ECDHE_PSK_WITH_NULL_SHA",
+                    "TLS_ECDHE_PSK_WITH_NULL_SHA256",
+                    "TLS_ECDHE_PSK_WITH_NULL_SHA384",
+                    "TLS_RSA_WITH_ARIA_128_CBC_SHA256",
+                    "TLS_RSA_WITH_ARIA_256_CBC_SHA384",
+                    "TLS_DH_DSS_WITH_ARIA_128_CBC_SHA256",
+                    "TLS_DH_DSS_WITH_ARIA_256_CBC_SHA384",
+                    "TLS_DH_RSA_WITH_ARIA_128_CBC_SHA256",
+                    "TLS_DH_RSA_WITH_ARIA_256_CBC_SHA384",
+                    "TLS_DHE_DSS_WITH_ARIA_128_CBC_SHA256",
+                    "TLS_DHE_DSS_WITH_ARIA_256_CBC_SHA384",
+                    "TLS_DHE_RSA_WITH_ARIA_128_CBC_SHA256",
+                    "TLS_DHE_RSA_WITH_ARIA_256_CBC_SHA384",
+                    "TLS_DH_anon_WITH_ARIA_128_CBC_SHA256",
+                    "TLS_DH_anon_WITH_ARIA_256_CBC_SHA384",
+                    "TLS_ECDHE_ECDSA_WITH_ARIA_128_CBC_SHA256",
+                    "TLS_ECDHE_ECDSA_WITH_ARIA_256_CBC_SHA384",
+                    "TLS_ECDH_ECDSA_WITH_ARIA_128_CBC_SHA256",
+                    "TLS_ECDH_ECDSA_WITH_ARIA_256_CBC_SHA384",
+                    "TLS_ECDHE_RSA_WITH_ARIA_128_CBC_SHA256",
+                    "TLS_ECDHE_RSA_WITH_ARIA_256_CBC_SHA384",
+                    "TLS_ECDH_RSA_WITH_ARIA_128_CBC_SHA256",
+                    "TLS_ECDH_RSA_WITH_ARIA_256_CBC_SHA384",
+                    "TLS_RSA_WITH_ARIA_128_GCM_SHA256",
+                    "TLS_RSA_WITH_ARIA_256_GCM_SHA384",
+                    "TLS_DH_RSA_WITH_ARIA_128_GCM_SHA256",
+                    "TLS_DH_RSA_WITH_ARIA_256_GCM_SHA384",
+                    "TLS_DH_DSS_WITH_ARIA_128_GCM_SHA256",
+                    "TLS_DH_DSS_WITH_ARIA_256_GCM_SHA384",
+                    "TLS_DH_anon_WITH_ARIA_128_GCM_SHA256",
+                    "TLS_DH_anon_WITH_ARIA_256_GCM_SHA384",
+                    "TLS_ECDH_ECDSA_WITH_ARIA_128_GCM_SHA256",
+                    "TLS_ECDH_ECDSA_WITH_ARIA_256_GCM_SHA384",
+                    "TLS_ECDH_RSA_WITH_ARIA_128_GCM_SHA256",
+                    "TLS_ECDH_RSA_WITH_ARIA_256_GCM_SHA384",
+                    "TLS_PSK_WITH_ARIA_128_CBC_SHA256",
+                    "TLS_PSK_WITH_ARIA_256_CBC_SHA384",
+                    "TLS_DHE_PSK_WITH_ARIA_128_CBC_SHA256",
+                    "TLS_DHE_PSK_WITH_ARIA_256_CBC_SHA384",
+                    "TLS_RSA_PSK_WITH_ARIA_128_CBC_SHA256",
+                    "TLS_RSA_PSK_WITH_ARIA_256_CBC_SHA384",
+                    "TLS_PSK_WITH_ARIA_128_GCM_SHA256",
+                    "TLS_PSK_WITH_ARIA_256_GCM_SHA384",
+                    "TLS_RSA_PSK_WITH_ARIA_128_GCM_SHA256",
+                    "TLS_RSA_PSK_WITH_ARIA_256_GCM_SHA384",
+                    "TLS_ECDHE_PSK_WITH_ARIA_128_CBC_SHA256",
+                    "TLS_ECDHE_PSK_WITH_ARIA_256_CBC_SHA384",
+                    "TLS_ECDHE_ECDSA_WITH_CAMELLIA_128_CBC_SHA256",
+                    "TLS_ECDHE_ECDSA_WITH_CAMELLIA_256_CBC_SHA384",
+                    "TLS_ECDH_ECDSA_WITH_CAMELLIA_128_CBC_SHA256",
+                    "TLS_ECDH_ECDSA_WITH_CAMELLIA_256_CBC_SHA384",
+                    "TLS_ECDHE_RSA_WITH_CAMELLIA_128_CBC_SHA256",
+                    "TLS_ECDHE_RSA_WITH_CAMELLIA_256_CBC_SHA384",
+                    "TLS_ECDH_RSA_WITH_CAMELLIA_128_CBC_SHA256",
+                    "TLS_ECDH_RSA_WITH_CAMELLIA_256_CBC_SHA384",
+                    "TLS_RSA_WITH_CAMELLIA_128_GCM_SHA256",
+                    "TLS_RSA_WITH_CAMELLIA_256_GCM_SHA384",
+                    "TLS_DH_RSA_WITH_CAMELLIA_128_GCM_SHA256",
+                    "TLS_DH_RSA_WITH_CAMELLIA_256_GCM_SHA384",
+                    "TLS_DH_DSS_WITH_CAMELLIA_128_GCM_SHA256",
+                    "TLS_DH_DSS_WITH_CAMELLIA_256_GCM_SHA384",
+                    "TLS_DH_anon_WITH_CAMELLIA_128_GCM_SHA256",
+                    "TLS_DH_anon_WITH_CAMELLIA_256_GCM_SHA384",
+                    "TLS_ECDH_ECDSA_WITH_CAMELLIA_128_GCM_SHA256",
+                    "TLS_ECDH_ECDSA_WITH_CAMELLIA_256_GCM_SHA384",
+                    "TLS_ECDH_RSA_WITH_CAMELLIA_128_GCM_SHA256",
+                    "TLS_ECDH_RSA_WITH_CAMELLIA_256_GCM_SHA384",
+                    "TLS_PSK_WITH_CAMELLIA_128_GCM_SHA256",
+                    "TLS_PSK_WITH_CAMELLIA_256_GCM_SHA384",
+                    "TLS_RSA_PSK_WITH_CAMELLIA_128_GCM_SHA256",
+                    "TLS_RSA_PSK_WITH_CAMELLIA_256_GCM_SHA384",
+                    "TLS_PSK_WITH_CAMELLIA_128_CBC_SHA256",
+                    "TLS_PSK_WITH_CAMELLIA_256_CBC_SHA384",
+                    "TLS_DHE_PSK_WITH_CAMELLIA_128_CBC_SHA256",
+                    "TLS_DHE_PSK_WITH_CAMELLIA_256_CBC_SHA384",
+                    "TLS_RSA_PSK_WITH_CAMELLIA_128_CBC_SHA256",
+                    "TLS_RSA_PSK_WITH_CAMELLIA_256_CBC_SHA384",
+                    "TLS_ECDHE_PSK_WITH_CAMELLIA_128_CBC_SHA256",
+                    "TLS_ECDHE_PSK_WITH_CAMELLIA_256_CBC_SHA384",
+                    "TLS_RSA_WITH_AES_128_CCM",
+                    "TLS_RSA_WITH_AES_256_CCM",
+                    "TLS_RSA_WITH_AES_128_CCM_8",
+                    "TLS_RSA_WITH_AES_256_CCM_8",
+                    "TLS_PSK_WITH_AES_128_CCM",
+                    "TLS_PSK_WITH_AES_256_CCM",
+                    "TLS_PSK_WITH_AES_128_CCM_8",
+                    "TLS_PSK_WITH_AES_256_CCM_8"
+            )));
+
+    public static boolean isH2Blacklisted(final String cipherSuite) {
+        return H2_BLACKLISTED.contains(cipherSuite);
 
 Review comment:
   Should the method use normalized strings?

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