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Re:Chromium and Mozilla to enforce 1 year validity for TLS c... by est31 on Sunday June 28, 2020 @03:09PM (#23671224)
IDK NSS seems to have code to verify it:

https://searchfox.org/mozilla-central/source/security/nss/li...

As does webpki:

https://github.com/briansmith/webpki/blob/482627c40dad2148da...

But haven't tested it (or checked other libraries).

Re:Chromium and Mozilla to enforce 1 year validity for TLS c... by est31 on Monday June 29, 2020 @07:29PM (#23684686)
Update: tested it with openssl and webpki. both claim to have support but it only works with openssl. For webpki I had to file two bugs:

https://github.com/briansmith/webpki/issues/134

https://github.com/briansmith/webpki/issues/135