An opaque type that represents a keychain item.
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A SecKeychainItem object for a certificate that is stored in a keychain can be safely cast to a SecCertificate for use with Certificate, Key, and Trust Services.
Relieve the user of remembering small secrets by storing them in the keychain.
func SecKeychainItemGetTypeID() -> CFTypeID
Returns the unique identifier of the opaque type to which a keychain item object belongs.