crypto: estimate kExternalSize

Based on a build of OpenSSL 1.1.0f.
The exact sizes are not particularly important (the original value was
missing all the objects hanging off anyway), only that V8 garbage
collector be aware that there is some memory usage beyond the sockets
themselves.
PR-URL: #16130
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Rod Vagg <rod@vagg.org>

Author: davidben

src/node_crypto.h

@@ -106,7 +106,13 @@ class SecureContext : public BaseObject {
 staticconstintkTicketKeyIVIndex = 4;
 
 protected:
+#if OPENSSL_VERSION_NUMBER < 0x10100000L
 staticconstint64_tkExternalSize = sizeof(SSL_CTX);
+#else
+// OpenSSL 1.1.0 has opaque structures. This is an estimate based on the size
+// as of OpenSSL 1.1.0f.
+staticconstint64_tkExternalSize = 872;
+#endif
 
 staticvoidNew(const v8::FunctionCallbackInfo<v8::Value>& args);
 staticvoidInit(const v8::FunctionCallbackInfo<v8::Value>& args);
@@ -220,11 +226,17 @@ class SSLWrap {
 protected:
 typedefvoid (*CertCb)(void* arg);
 
+#if OPENSSL_VERSION_NUMBER < 0x10100000L
 // Size allocated by OpenSSL: one for SSL structure, one for SSL3_STATE and
 // some for buffers.
 // NOTE: Actually it is much more than this
 staticconstint64_tkExternalSize =
 sizeof(SSL) + sizeof(SSL3_STATE) + 42 * 1024;
+#else
+// OpenSSL 1.1.0 has opaque structures. This is an estimate based on the size
+// as of OpenSSL 1.1.0f.
+staticconstint64_tkExternalSize = 4448 + 1024 + 42 * 1024;
+#endif
 
 staticvoidInitNPN(SecureContext* sc);
 staticvoidAddMethods(Environment* env, v8::Local<v8::FunctionTemplate> t);