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certtool(1) on macOS

The text 9761930be4d8, as macOS 10.12.6, macOS 10.12.5, macOS 10.12.4, macOS 10.12.3, macOS 10.12.2, macOS 10.12.1, macOS 10.12 shipped it.

create key pairs, certificates and certificate signing requests for use with Keychains

certtool(1) on macOS now