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https://github.com/OPCFoundation/UA-.NETStandard.git
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Cristi Pogacean
5fa272d89a
## Summary Route certificate operations through the providers registered on the configured manager, so custom stores work consistently during validation, key loading, provisioning and GDS operations. - Add optional `ICertificateStoreResolver`, implemented by `CertificateManager`, without adding members to `ICertificateManager` or removing existing public signatures. - Use scoped resolution for configuration validation, startup and cold-cache private-key lookup, application certificate provisioning/reuse/deletion, existing-key GDS signing requests, and hosted TrustList access. - Preserve built-in lookup when no resolver is available, private-key lookup fallbacks, access checks and transaction behavior. Resolver failures do not silently fall back to Directory. Returned stores remain caller-owned; TrustList retains cached-store disposal. - Add regression coverage for instance isolation, mixed provider types, real private-key reuse, rotation lookup, cancellation/failure disposal, unavailable-key rejection, CSR output and TrustList lifetime. Document the optional capability. Fixes #4527 Fixes #4528 Fixes #4529 Fixes #4530 Fixes #4531 ## Validation Change-scoped Release tests on Windows, on base `5d26f6f43`: | Fixture selection | net10.0 | net48 | | --- | ---: | ---: | | CertificateManagerFactoryTests + CertificateManagerTests | 71 passed | 71 passed | | ApplicationInstanceTests | 56 passed | 56 passed | | TrustListTests + ConfigurationNodeManagerPushTests | 147 passed | 147 passed | All six selections exited 0 with zero failures or skips. Changed-file whitespace verification and `git diff --check` passed. Fresh no-fix comparisons retained the new resolver API/manager implementation, but reversed the validation, provisioning and CSR consumer fixes: validation had 2 custom-store failures / 1 built-in control pass; provisioning had 4 custom-store failures / 1 built-in control pass; CSR had 1 custom-store failure / 1 built-in control pass. Failures reported unknown custom store types or invalid custom trust stores. All consumer source changes were restored, rebuilt, and the full focused net10.0 selections passed again. Earlier TrustList regression evidence is recorded in #4531: its before comparison retained the constructor injection boundary while exercising the old store-opening path. It was not a test against an entirely unextended API. The complete platform/framework matrix is left to PR CI; no full local matrix or completed CI qualification is claimed. Local restore used command-line-only NuGet v2/feed-audit overrides; no repository feed, test or contribution guidance was changed.