crypto/x509: consider parents by Subject if AKID has no match

If a certificate somehow has an AKID, it should still chain successfully
to a parent without a SKID, even if the latter is invalid according to
RFC 5280, because only the Subject is authoritative.

This reverts to the behavior before #29233 was fixed in 770130659. Roots
with the right subject will still be shadowed by roots with the right
SKID and the wrong subject, but that's been the case for a long time, and
is left for a more complete fix in Go 1.13.

Updates #30079

Change-Id: If8ab0179aca86cb74caa926d1ef93fb5e416b4bb
Reviewed-by: Adam Langley <>
2 files changed
tree: 09ff2af02c2cff46611aaa3de55bd13ec5c7652e
  1. .gitattributes
  2. .github/
  3. .gitignore
  10. api/
  11. doc/
  12. favicon.ico
  13. lib/
  14. misc/
  15. robots.txt
  16. src/
  17. test/

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