TLS1_CK_ECDH_RSA_WITH_AES_128_GCM_SHA256

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
extern (C) nothrow
enum TLS1_CK_ECDH_RSA_WITH_AES_128_GCM_SHA256 = 0x0300C031;

Meta