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diff --git a/src/tls.h b/src/tls.h
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+/*
+ * nghttp2 - HTTP/2 C Library
+ *
+ * Copyright (c) 2012 Tatsuhiro Tsujikawa
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+#ifndef TLS_H
+#define TLS_H
+
+#include "nghttp2_config.h"
+
+#include <cinttypes>
+
+#include <openssl/ssl.h>
+
+#include "ssl_compat.h"
+
+namespace nghttp2 {
+
+namespace tls {
+
+// Recommended general purpose "Intermediate compatibility" cipher
+// suites for TLSv1.2 by mozilla.
+//
+// https://wiki.mozilla.org/Security/Server_Side_TLS
+constexpr char DEFAULT_CIPHER_LIST[] =
+    "ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-"
+    "AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-"
+    "POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-"
+    "AES256-GCM-SHA384";
+
+// Recommended general purpose "Modern compatibility" cipher suites
+// for TLSv1.3 by mozilla.
+//
+// https://wiki.mozilla.org/Security/Server_Side_TLS
+constexpr char DEFAULT_TLS13_CIPHER_LIST[] =
+#if defined(NGHTTP2_GENUINE_OPENSSL) || defined(NGHTTP2_OPENSSL_IS_LIBRESSL)
+    "TLS_AES_128_GCM_SHA256:TLS_AES_256_GCM_SHA384:TLS_CHACHA20_POLY1305_SHA256"
+#else  // !NGHTTP2_GENUINE_OPENSSL && !NGHTTP2_OPENSSL_IS_LIBRESSL
+    ""
+#endif // !NGHTTP2_GENUINE_OPENSSL && !NGHTTP2_OPENSSL_IS_LIBRESSL
+    ;
+
+constexpr auto NGHTTP2_TLS_MIN_VERSION = TLS1_VERSION;
+#ifdef TLS1_3_VERSION
+constexpr auto NGHTTP2_TLS_MAX_VERSION = TLS1_3_VERSION;
+#else  // !TLS1_3_VERSION
+constexpr auto NGHTTP2_TLS_MAX_VERSION = TLS1_2_VERSION;
+#endif // !TLS1_3_VERSION
+
+const char *get_tls_protocol(SSL *ssl);
+
+struct TLSSessionInfo {
+  const char *cipher;
+  const char *protocol;
+  const uint8_t *session_id;
+  bool session_reused;
+  size_t session_id_length;
+};
+
+TLSSessionInfo *get_tls_session_info(TLSSessionInfo *tls_info, SSL *ssl);
+
+// Returns true iff the negotiated protocol is TLSv1.2.
+bool check_http2_tls_version(SSL *ssl);
+
+// Returns true iff the negotiated cipher suite is in HTTP/2 cipher
+// block list.
+bool check_http2_cipher_block_list(SSL *ssl);
+
+// Returns true if SSL/TLS requirement for HTTP/2 is fulfilled.
+// To fulfill the requirement, the following 2 terms must be hold:
+//
+// 1. The negotiated protocol must be TLSv1.2.
+// 2. The negotiated cipher cuite is not listed in the block list
+//    described in RFC 7540.
+bool check_http2_requirement(SSL *ssl);
+
+// Sets TLS min and max versions to |ssl_ctx|.  This function returns
+// 0 if it succeeds, or -1.
+int ssl_ctx_set_proto_versions(SSL_CTX *ssl_ctx, int min, int max);
+
+} // namespace tls
+
+} // namespace nghttp2
+
+#endif // TLS_H