# SecCodeCheckValidity(_:_:_:) Performs dynamic validation of signed code. ``` func SecCodeCheckValidity(_ code: SecCode, _ flags: SecCSFlags, _ requirement: SecRequirement?) -> OSStatus ``` ## Parameters `code` The code object to be validated. `flags` Optional flags; see [`SecCSFlags`](/documentation/Security/SecCSFlags) for possible values. Pass [`kSecCSDefaultFlags`](/documentation/Security/SecCSFlags/kSecCSDefaultFlags) for standard behavior. `requirement` A code requirement specifying additional conditions the code must satisfy to be considered valid. Specify `NULL` if you don’t want to impose any additional requirements. Use the [`SecRequirementCreateWithString(_:_:_:)`](/documentation/Security/SecRequirementCreateWithString(_:_:_:)) or [`SecRequirementCreateWithStringAndErrors(_:_:_:_:)`](/documentation/Security/SecRequirementCreateWithStringAndErrors(_:_:_:_:)) function to create a code requirement object. See [Code Signing Guide](https://developer.apple.com/library/archive/documentation/Security/Conceptual/CodeSigningGuide/Introduction/Introduction.html#//apple_ref/doc/uid/TP40005929) for a discussion of code requirements. ## Return Value A result code. See [Code Signing Services Result Codes](/documentation/Security/code-signing-services-result-codes). ## Discussion This function obtains and verifies the signature on the code specified by the code object. It checks the validity of only those sealed components required to establish identity. For guest code, first the function checks the code object’s dynamic validity status as reported by its host, then it ensures that the code object’s host is in turn valid. For all code, it validates the code against a code requirement if one is specified. The call succeeds if all these conditions are satisfactory. This function is secure against attempts to modify the file system source of the code object. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)