hkdf: use boring.SupportsHKDF instead of hardcoding backends #1037
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While working on #1036 I realized that the
goexperiment.OpenSSLCrypto || goexperiment.CNGCryptocheck done before calling HKDF functions could be generalized tobackend.Enabled && backend.SupportsHKDF().This PR also fixes a potential bug: we should be checking if OpenSSL/CNG support HKDF before calling HKDF-related functions, else those functions will fail. We haven't seen this issue yet because HKDF is well-supported in recent Windows and OpenSSL versions.