diff --git a/library/ssl_misc.h b/library/ssl_misc.h
index aaa910f..10ebfff 100644
--- a/library/ssl_misc.h
+++ b/library/ssl_misc.h
@@ -1927,88 +1927,11 @@
           MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_SOME_PSK_ENABLED */
 
 /*
- * Helper functions to check if the extension is allowed or forbiden
+ * Helper functions for extensions checking and convert.
  */
-static inline int mbedtls_ssl_tls13_has_extensions( mbedtls_ssl_context *ssl,
-                                                    int extensions_mask )
-{
-    int masked = ssl->handshake->extensions_present & extensions_mask;
-    return( masked != 0 );
-}
 
-static inline int mbedtls_tls13_get_extension_mask( uint16_t extension_type )
-{
-    switch( extension_type )
-    {
-        case MBEDTLS_TLS_EXT_SERVERNAME:
-            return( MBEDTLS_SSL_EXT_SERVERNAME );
+uint32_t mbedtls_tls13_get_extension_mask( uint16_t extension_type );
 
-        case MBEDTLS_TLS_EXT_MAX_FRAGMENT_LENGTH:
-            return( MBEDTLS_SSL_EXT_MAX_FRAGMENT_LENGTH );
-
-        case MBEDTLS_TLS_EXT_STATUS_REQUEST:
-            return( MBEDTLS_SSL_EXT_STATUS_REQUEST );
-
-        case MBEDTLS_TLS_EXT_SUPPORTED_GROUPS:
-            return( MBEDTLS_SSL_EXT_SUPPORTED_GROUPS );
-
-        case MBEDTLS_TLS_EXT_SIG_ALG:
-            return( MBEDTLS_SSL_EXT_SIG_ALG );
-
-        case MBEDTLS_TLS_EXT_USE_SRTP:
-            return( MBEDTLS_SSL_EXT_USE_SRTP );
-
-        case MBEDTLS_TLS_EXT_HEARTBEAT:
-            return( MBEDTLS_SSL_EXT_HEARTBEAT );
-
-        case MBEDTLS_TLS_EXT_ALPN:
-            return( MBEDTLS_SSL_EXT_ALPN );
-
-        case MBEDTLS_TLS_EXT_SCT:
-            return( MBEDTLS_SSL_EXT_SCT );
-
-        case MBEDTLS_TLS_EXT_CLI_CERT_TYPE:
-            return( MBEDTLS_SSL_EXT_CLI_CERT_TYPE );
-
-        case MBEDTLS_TLS_EXT_SERV_CERT_TYPE:
-            return( MBEDTLS_SSL_EXT_SERV_CERT_TYPE );
-
-        case MBEDTLS_TLS_EXT_PADDING:
-            return( MBEDTLS_SSL_EXT_PADDING );
-
-        case MBEDTLS_TLS_EXT_PRE_SHARED_KEY:
-            return( MBEDTLS_SSL_EXT_PRE_SHARED_KEY );
-
-        case MBEDTLS_TLS_EXT_EARLY_DATA:
-            return( MBEDTLS_SSL_EXT_EARLY_DATA );
-
-        case MBEDTLS_TLS_EXT_SUPPORTED_VERSIONS:
-            return( MBEDTLS_SSL_EXT_SUPPORTED_VERSIONS );
-
-        case MBEDTLS_TLS_EXT_COOKIE:
-            return( MBEDTLS_SSL_EXT_COOKIE );
-
-        case MBEDTLS_TLS_EXT_PSK_KEY_EXCHANGE_MODES:
-            return( MBEDTLS_SSL_EXT_PSK_KEY_EXCHANGE_MODES );
-
-        case MBEDTLS_TLS_EXT_CERT_AUTH:
-            return( MBEDTLS_SSL_EXT_CERT_AUTH );
-
-        case MBEDTLS_TLS_EXT_OID_FILTERS:
-            return( MBEDTLS_SSL_EXT_OID_FILTERS );
-
-        case MBEDTLS_TLS_EXT_POST_HANDSHAKE_AUTH:
-            return( MBEDTLS_SSL_EXT_POST_HANDSHAKE_AUTH );
-
-        case MBEDTLS_TLS_EXT_SIG_ALG_CERT:
-            return( MBEDTLS_SSL_EXT_SIG_ALG_CERT );
-
-        case MBEDTLS_TLS_EXT_KEY_SHARE:
-            return( MBEDTLS_SSL_EXT_KEY_SHARE );
-    };
-
-    return( MBEDTLS_SSL_EXT_UNRECOGNIZED );
-}
 
 /*
  * Helper functions to check the selected key exchange mode.