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Code signing utility — manages digital signatures and certificate validation

Validates and applies cryptographic signatures to macOS binaries and code bundles. Accesses the Keychain to retrieve signing certificates and private keys, then computes and embeds signatures using standard code signing formats. Verifies signatures on existing code by checking certificate chains and validating cryptographic digests. Communicates with Apple's signing services and certificate authority endpoints to validate certificates and check revocation status. Stores temporary signing data and certificate information in private storage areas.AI