TLS1_CK_ECDHE_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_ECDHE_RSA_WITH_AES_128_GCM_SHA256 = 0x0300C02F;

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