rfc9923v8.txt		rfc9923.txt
	Independent Submission G. Fowler		Independent Submission L. Noll
	Request for Comments: 9923 Google		Request for Comments: 9923
	Category: Informational L. Noll		Category: Informational K. Vo
	ISSN: 2070-1721		ISSN: 2070-1721 Google
	K. Vo
	Google
	D. Eastlake 3rd		D. Eastlake 3rd
	Independent		Independent
	T. Hansen		T. Hansen
	AT&T		AT&T
	January 2026		February 2026
	The FNV Non-Cryptographic Hash Algorithm		The FNV Non-Cryptographic Hash Algorithm
	Abstract		Abstract
	FNV (Fowler/Noll/Vo) is a fast, non-cryptographic hash algorithm with		FNV (Fowler/Noll/Vo) is a fast, non-cryptographic hash algorithm with
	good dispersion that has been widely used and is referenced in a		good dispersion that has been widely used and is referenced in a
	number of standards documents. The purpose of this document is to		number of standards documents. The purpose of this document is to
	make information on FNV and open-source code performing all specified		make information on FNV and open-source code performing all specified
	sizes of FNV conveniently available to the Internet community.		sizes of FNV conveniently available to the Internet community.
	skipping to change at line 222 ¶		skipping to change at line 220 ¶
	standards documents: [RFC7357], [RFC7873], and [IEEE8021Q-2022].		standards documents: [RFC7357], [RFC7873], and [IEEE8021Q-2022].
	A study has recommended FNV in connection with the IPv6 flow label		A study has recommended FNV in connection with the IPv6 flow label
	value [IPv6flow]. Additionally, there was a proposal to use FNV for		value [IPv6flow]. Additionally, there was a proposal to use FNV for
	Bidirectional Forwarding Detection (BFD) sequence number generation		Bidirectional Forwarding Detection (BFD) sequence number generation
	[BFDseq]. [NCHF] discusses criteria for evaluating non-cryptographic		[BFDseq]. [NCHF] discusses criteria for evaluating non-cryptographic
	hash functions.		hash functions.
	If you use an FNV function in an application, you are kindly		If you use an FNV function in an application, you are kindly
	requested to send a note via the process outlined at		requested to send a note via the process outlined at
	<http://www.isthe.com/chongo/tech/comp/fnv/index.html#history>.		<http://www.isthe.com/chongo/tech/comp/fnv/index.html#address>.
	1.4. Why Is FNV Non-Cryptographic?		1.4. Why Is FNV Non-Cryptographic?
	A full discussion of cryptographic hash requirements and strength is		A full discussion of cryptographic hash requirements and strength is
	beyond the scope of this document. However, here are three		beyond the scope of this document. However, here are three
	characteristics of FNV that would generally be considered to make it		characteristics of FNV that would generally be considered to make it
	non-cryptographic:		non-cryptographic:
	1. Sticky State - A cryptographic hash should not have a state in		1. Sticky State - A cryptographic hash should not have a state in
	which it can stick for a plausible input pattern. But in the		which it can stick for a plausible input pattern. But in the
	skipping to change at line 6241 ¶		skipping to change at line 6239 ¶
	digest = digest.multiply(fnvPrime).mod(m);		digest = digest.multiply(fnvPrime).mod(m);
	}		}
	return (digest);		return (digest);
	}		}
	}		}
	<CODE ENDS>		<CODE ENDS>
	Acknowledgements		Acknowledgements
			Significant contributions were made by Glenn S. Fowler.
	The contributions of the following, listed in alphabetical order, are		The contributions of the following, listed in alphabetical order, are
	gratefully acknowledged:		gratefully acknowledged:
	Roman Donchenko, Frank Ellermann, Stephen Farrell, Tony Finch, Paul		Roman Donchenko, Frank Ellermann, Stephen Farrell, Tony Finch, Paul
	Hoffman, Charlie Kaufman, Eliot Lear, Bob Moskowitz, Gayle Noble,		Hoffman, Charlie Kaufman, Eliot Lear, Bob Moskowitz, Gayle Noble,
	Stefan Santesson, Mukund Sivaraman, and Paul Wouters.		Stefan Santesson, Mukund Sivaraman, and Paul Wouters.
	Authors' Addresses		Authors' Addresses
	Glenn S. Fowler
	Google
	Email: glenn.s.fowler@gmail.com
	Landon Curt Noll		Landon Curt Noll
	Email: fnv-ietf8-mail@asthe.com		Email: fnv-ietf8-mail@asthe.com
	URI: http://www.isthe.com/chongo		URI: http://www.isthe.com/chongo
	Kiem-Phong Vo		Kiem-Phong Vo
	Google		Google
	Email: phongvo@gmail.com		Email: phongvo@gmail.com
	Donald E. Eastlake 3rd		Donald E. Eastlake 3rd
	Independent		Independent
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