.net - ASP.NET TicketDataFormat.Unprotect(cookieValue) returns null -


i trying decrypt authentication cookie set .net 4.6.2 mvc app created following in startup.auth:

            ticketdataformat = new aspnetticketdataformat(                 new dataprotectorshim(                     dataprotectionprovider.create(new directoryinfo(@"c:\keys\"))                         .createprotector("blah")))

this i'm doing try , decrypt it:

//  create data protector facilitate in decrypting cookie. var provider = dataprotectionprovider.create(new directoryinfo(keydirectory)); var dataprotector = provider.createprotector(dataprotectorpurpose);  //  decrypt cookie, obtaining authentication ticket. var ticketdataformat = new ticketdataformat(dataprotector); var ticket = ticketdataformat.unprotect(cookievalue);

this working fine until started identity customisation. have created new identityuser inherits identityuser can add few fields. failing read identity maybe?

thanks

i have solved through lot of playing about.

it turned out combination of following issues:

  • the purpose , sub purposes strings provided dataprotectionprovider createprotector method not set "microsoft.aspnetcore.authentication.cookies.cookieauthenticationmiddleware", "cookies", "v2". had them string value reading docs, thought string, long same between apps needing share cookie.
  • one of apps using version 1.1.2 of microsoft.aspnetcore.dataprotection nuget package, whereas other using version 1.1.1. upgraded 1.1.1 -> 1.1.2.

all seems work fine now. having custom user identity in 1 app not in other not matter, cookie can still understood , claimsidentity extracted.


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