---
title: "SecCodeCheckValidity(_:_:_:)"
framework: security
role: symbol
role_heading: Function
path: "security/seccodecheckvalidity(_:_:_:)"
---

# SecCodeCheckValidity(_:_:_:)

Performs dynamic validation of signed code.

## Declaration

```swift
func SecCodeCheckValidity(_ code: SecCode, _ flags: SecCSFlags, _ requirement: SecRequirement?) -> OSStatus
```

## Parameters

- `code`: The code object to be validated.
- `flags`: Optional flags; see doc://com.apple.security/documentation/Security/SecCSFlags for possible values. Pass doc://com.apple.security/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 doc://com.apple.security/documentation/Security/SecRequirementCreateWithString(_:_:_:) or doc://com.apple.security/documentation/Security/SecRequirementCreateWithStringAndErrors(_:_:_:_:) function to create a code requirement object. See 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

Return Value A result code. See Code Signing Services Result Codes.

## Discussion

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.