@param flags Optional flags. Pass kSecCSDefaultFlags for standard behavior.
@param requirement On successful return, contains a reference to a SecRequirement
object that implements the conditions described in text.
- @param errors An optional pointer to a CFErrorRef variable. If the call fails
- (and something other than errSecSuccess is returned), and this argument is non-NULL,
- a CFErrorRef is stored there further describing the nature and circumstances
- of the failure. The caller must CFRelease() this error object when done with it.
@result Upon success, errSecSuccess. Upon error, an OSStatus value documented in
CSCommon.h or certain other Security framework headers.
*/