Paul Haddad
Grabbed a new Mac App Store receipt. They are back to using SHA1 and it now has an expiration date in 2023.pic.twitter.com/HgenGzPLaB
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@mjtsai@mattstevens two totally diff dates.
Matt Stevens
Michael Tsai
@tapbot_paul @mjtsai It’s like a code signing timestamp. If the signing certificate is trusted, you check if it was valid at signing time.
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@mattstevens So if you don't check it, it won't falsely cause validation to fail? -
@mjtsai You check the creation date (when the cert was used) against the certificate’s validity period, vs checking the current time. -
@mjtsai So if the certificate is trusted and was valid at the time it was used you don’t care if it is expired. -
@mattstevens Right. My question is, does Apple's sample code implicitly use the current date? (Guess: No. So this wouldn't be a problem.) -
@mjtsai Looks like no and you’re right, it’s not an issue if you don’t check the validity period at all. -
@mjtsai I was wrong, after testing that code will verify the chain against the current time unless otherwise configured. - View other replies
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