pfd

Code signing utility — validates and manages application code signatures

Validates code signatures on macOS executables and frameworks, verifying cryptographic signatures against Apple's certificate authority and checking for tampering or revocation. Accesses the Keychain to retrieve and verify certificates used in code signing operations. Exposes an XPC service for system tools and applications to request signature validation. Communicates with network endpoints, likely for certificate revocation checking (OCSP) or timestamp validation during signature verification.AI