Editing Fowler–Noll–Vo hash function (section)

==Overview==
The current versions are FNV-1 and FNV-1a, which supply a means of creating non-zero ''FNV offset basis''.  FNV currently{{As of when|date=August 2024}} comes in 32-, 64-, 128-, 256-, 512-, and 1024-bit variants.  For pure FNV implementations, this is determined solely by the availability of ''FNV primes'' for the desired bit length; however, the FNV webpage discusses methods of adapting one of the above versions to a smaller length that may  or may not be a power of two.<ref>{{Cite web|url=http://www.isthe.com/chongo/tech/comp/fnv/index.html#xor-fold|title=FNV Hash - Changing the FNV hash size - xor-folding|website=www.isthe.com}}</ref><ref>{{Cite web|url=http://www.isthe.com/chongo/tech/comp/fnv/index.html#other-folding|title=FNV Hash - Changing the FNV hash size - non-powers of 2|website=www.isthe.com}}</ref>

The FNV hash algorithms and reference FNV [[source code]]<ref name="FNV_prime">{{Cite journal|last1=Eastlake|first1=Donald|last2=Hansen|first2=Tony|last3=Fowler|first3=Glenn|last4=Vo|first4=Kiem-Phong|last5=Noll|first5=Landon|date=29 May 2019|title=The FNV Non-Cryptographic Hash Algorithm|url=https://tools.ietf.org/html/draft-eastlake-fnv-17.html|archive-url=|archive-date=|access-date=|website=tools.ietf.org}}</ref><ref>{{Cite web|url=http://www.isthe.com/chongo/tech/comp/fnv/index.html#FNV-source|title=FNV Hash - FNV source|website=www.isthe.com}}</ref> have been released into the [[public domain]].<ref>[http://www.isthe.com/chongo/tech/comp/fnv/index.html#public_domain FNV put into the public domain] on isthe.com</ref>

The [[Python programming language]] previously used a modified version of the FNV scheme for its default <code>hash</code> function. From Python 3.4, FNV has been replaced with [[SipHash]] to resist "[[Collision attack#Hash flooding|hash flooding]]" [[denial-of-service attack]]s.<ref>{{Cite web|url=https://www.python.org/dev/peps/pep-0456/|title=PEP 456 -- Secure and interchangeable hash algorithm|website=Python.org}}</ref>

FNV is not a [[cryptographic hash]].<ref name="FNV_prime"/>