#503 undocumented XML_SetHashSalt(p, 0) semantics

Feature Request
Joe Orton

Per e-mail discussion:

Tomas Hoger noticed that the semantics of XML_SetHashSalt are surprising
when 0 is passed. That value does not force a fixed hash salt, as might be
expected from reading the API description, but instead implies use of a
random hash salt, per startParsing():

if (hash_secret_salt == 0)
hash_secret_salt = generate_hash_secret_salt();

Which is the desired semantics? It would be simple to fix either the header
or the implementation. pyexpat is apparently using XML_SetHashSalt(parser,
0) hoping for a fixed hash salt.

Affects Version: expat 2.1.0


  • Karl Waclawek

    Karl Waclawek - 2012-05-15

    Documentation corrected in reference.html rev. 1.76.
    The sentinel value for the hash salt could be changed to a different value in a later release, if this behavior causes a real issue. However, no code should depend on the internal workings of the hash function in Expat.

  • Karl Waclawek

    Karl Waclawek - 2012-05-15
    • status: open --> open-fixed
  • Sebastian Pipping

    • status: open-fixed --> closed-fixed
    • Group: --> Feature Request
  • Sebastian Pipping

    Fixed by commit 891ec14f60e97515e69278fba6ee52381859a5fb, included with next release, closing.


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