An opaque type that represents a keychain item.
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typedef struct __SecKeychainItem SecKeychainItemRef;
A SecKeychainItemRef object for a certificate that is stored in a keychain can be safely cast to a SecCertificateRef for use with Certificate, Key, and Trust Services.
Relieve the user of remembering small secrets by storing them in the keychain.
Returns the unique identifier of the opaque type to which a keychain item object belongs.