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Windows CNG Key Storage Provider (KSP)
What is it?
Cosmian KMS provides a Windows CNG Key Storage Provider (KSP) DLL —
cosmian_kms_cng_ksp.dll — that stores private keys inside Cosmian KMS rather
than the local Windows machine store.
A Key Storage Provider is a pluggable module defined by the Windows
Cryptography API: Next Generation (CNG) framework (introduced in Windows
Vista / Server 2008). CNG replaces the older CAPI (CryptoAPI). Any application
that calls the standard NCrypt* family of functions — including the Windows
certificate enrollment engine, Schannel (TLS), and Code Signing — automatically
uses whichever KSP is associated with a given key, with no application changes
required. By deploying cosmian_kms_cng_ksp.dll, all private key material is
kept inside Cosmian KMS: it never exists on the device disk.
Closes #846