A Code Signing certificate in macOS allows you to sign modules or programs using codesign tool. Code signing is a security measure used by Gatekeeper in macOS to allow only verified applications to execute.
Code Signing certificate can be generated using Keychain Access utility. It has to be issued by a Certified Authority (CA), which you need to create if you don't already have one.
Steps to create code signing certificate using Keychain Access:
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Launch Keychain Access.
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Go to Keychain Access → Certificate Assistant → Create a Certificate from the menu bar.
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Set the name of the certificate.
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Click on Identity Type select list.
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Select Leaf from the list.
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Click on Certificate Type select list.
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Select Code Signing from the list.
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Click Create to continue.
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Select CA or issuer from the list and click Create.
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Click Done to finish the process.
