Function authenticates

dds/DCPS/security/CryptoBuiltInImpl.cpp:1072–1078

  }

  bool authenticates(const KeyMaterial_AES_GCM_GMAC& k)
  {
    const CryptoTransformKind& kind = k.transformation_kind;
    return kind[0] == 0 && kind[1] == 0 && kind[2] == 0
      && (kind[TransformKindIndex] == CRYPTO_TRANSFORMATION_KIND_AES128_GMAC ||
          kind[TransformKindIndex] == CRYPTO_TRANSFORMATION_KIND_AES256_GMAC);
  }

  struct CipherContext {
    EVP_CIPHER_CTX* ctx_;