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I am the developer of ovpn-dco-win, the new network driver for OpenVPN. "DCO" stands for "data channel offload", the driver does encryption/decryption in kernel and eliminates need of transferring packets between user and kernel space, which gives noticeable performance advantage.
At the moment driver support only AES-GCM crypto and uses CNG as crypto library. We would like to support chachapoly as well, but according to CNG documentation and bcrypt.h from SDK 19041, there is no support for chachapoly.
I stumbled across SymCrypt, which claims to be "the core cryptographic function library currently used by Windows". SymCrypt has support for chachapoly and can be used in kernel mode. However I cannot find any mentioning of SymCrypt on MSFT website nor any documentation / code examples apart from library repository itself.
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