Ncryptopenstorageprovider New ((better)) -

Deep Dive: NCryptOpenStorageProvider in CNG

Why Use NcryptOpenStorageProvider?

The Role of CNG and Key Storage Providers

• If --key-source hsm: The DEK is wrapped (encrypted) by a Key Encryption Key (KEK) stored in the HSM.
• If --key-source kms: The DEK is sent to a KMS (e.g., Vault Transit) for external wrapping.

Function Signature

• In C++: Use RAII wrappers (e.g., unique_ptr with a custom deleter).
• In C# Interop: Use SafeHandle classes.
• In Rust: Wrap the handle in a Drop trait.

Understanding NcryptOpenStorageProvider: A Comprehensive Guide

For the most current information, always refer to the official Microsoft CNG documentation and the headers ncrypt.h and winerror.h .

5. Metadata and Privacy