Hi Apple Developers, I'm having a problem with evaluatedPolicyDomainState: on the same device, its value keeps changing and then switching back to the original. My current iOS version is 26.1. I upgraded my iOS from version 18.6.2 to 26.1. What could be the potential reasons for this issue?
{
NSError *error;
BOOL success = YES;
char *eds = nil;
int edslen = 0;
LAContext *context = [[LAContext alloc] init];
// test if we can evaluate the policy, this test will tell us if Touch ID is available and enrolled
// success = [context canEvaluatePolicy: LAPolicyDeviceOwnerAuthenticationWithBiometrics error:&error];
if (SystemVersion > 9.3) {
// test if we can evaluate the policy, this test will tell us if Touch ID is available and enrolled
success = [context canEvaluatePolicy: LAPolicyDeviceOwnerAuthentication error:&error];
}
else{
// test if we can evaluate the policy, this test will tell us if Touch ID is available and enrolled
success = [context canEvaluatePolicy: LAPolicyDeviceOwnerAuthenticationWithBiometrics error:&error];
}
if (success)
{
if (@available(iOS 18.0, *)) {
NSData *stateHash = nil;
if ([context respondsToSelector:@selector(domainState)]) {
stateHash = [[context performSelector:@selector(domainState)] performSelector:@selector(stateHash)];
}else{
stateHash = [context evaluatedPolicyDomainState];
}
eds = (char *)stateHash.bytes;
edslen = (int)stateHash.length;
} else {
eds = (char *)[[context evaluatedPolicyDomainState] bytes];
edslen = (int)[[context evaluatedPolicyDomainState] length];
}
CC_SHA256(eds, edslen, uviOut);
*poutlen = CC_SHA256_DIGEST_LENGTH;
}
else
{
*poutlen = 32;
gm_memset(uviOut, 0x01, 32);
}
}
The user previously …
Well, that’s quite an edge case.
Having said that, just because it’s an edge case doesn’t mean it shouldn’t work |-:
And what is the basis for generating this value?
I can’t go into those details. I don’t know off the top of my head but, even if I did, I’m reluctant to discuss implementation details like this unless there’s some specific benefit to it. And I’m not seeing that here.
Rather, this is clearly something that you should report as a bug.
IMPORTANT For this bug to get any sort of traction, you’ll need a sysdiagnose log. I’m presuming you can’t reproduce that yourself, so you’ll need to ask your user to either send you the sysdiagnose log or file their own bug, attach the log there, and send you the bug number.
Ideally they’d trigger this sysdiagnose log immediately after the value changes unexpectedly.
If you do manage to get a bug on file about this, please post your bug number, just for the record.
Share and Enjoy
—
Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@" + "apple.com"