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MS-PKCA v20211006 (section 2.2)[1] defines the following supported algorithms for PKINIT CMS signature:

  * md5WithRSAEncryption (since Windows Server 2003)
  * sha1WithRSAEncryption (newer than Windows Server 2003)
  * ecdsa-with-sha1/256/384/512 (newer than Windows Server 2008)

Out of this list, ECDSA signatures are the only ones that are still allowed to verify on RHEL9 (SHA-1 and MD5 signatures verification is disallowed by default). We should implement RFC5349[2] in MIT krb5 in order to support PKINIT pre-authentication against Active Directory.


[1] https://winprotocoldoc.blob.core.windows.net/productionwindowsarchives/MS-PKCA/%5bMS-PKCA%5d.pdf
[2] https://www.rfc-editor.org/rfc/rfc5349.html

*** Bug 2125392 has been marked as a duplicate of this bug. ***

*** Bug 2106039 has been marked as a duplicate of this bug. ***

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