//go:cgo_import_dynamic x509_SecTrustGetCertificateAtIndex SecTrustGetCertificateAtIndex "/System/Library/Frameworks/Security.framework/Versions/A/Security"

func SecTrustGetCertificateAtIndex(trustObj CFRef, i int) (CFRef, error) {
	ret := syscall(abi.FuncPCABI0(x509_SecTrustGetCertificateAtIndex_trampoline), uintptr(trustObj), uintptr(i), 0, 0, 0, 0)
	if ret == 0 {
		return 0, OSStatus{"SecTrustGetCertificateAtIndex", int32(ret)}
	}
	return CFRef(ret), nil

			return nil, fmt.Errorf("x509: %s", err)
		}
	}

	chain := [][]*Certificate{{}}
	numCerts := macOS.SecTrustGetCertificateCount(trustObj)
	for i := 0; i < numCerts; i++ {
		certRef, err := macOS.SecTrustGetCertificateAtIndex(trustObj, i)
		if err != nil {
			return nil, err
		}
		cert, err := exportCertificate(certRef)
		if err != nil {
			return nil, err
		}
		chain[0] = append(chain[0], cert)
	}