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Certificate and security validation service — manages code signing and keychain verification

Validates code signatures, certificates, and security policies using the Security framework and Keychain. Exposes an XPC service that other processes query to verify digital signatures, check certificate chains, and validate code authenticity. Communicates with network endpoints to retrieve certificate revocation information and policy updates. Manages access to stored certificates and signing credentials through Keychain integration, enforcing permission controls for sensitive cryptographic operations.AI