PHP implementation of Fowler–Noll–Vo 1a

Copyright 2017-2021 Philippe Paquet

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Description

Fowler–Noll–Vo 1a is a variant of the non-cryptographic hash function created by Glenn Fowler, Landon Curt Noll, and Kiem-Phong Vo.

For the specifications, check the IETF draft.

For some history, check Landon Curt Noll website

This implementation of FNV 1a includes all the specified bit sizes (32, 64, 128, 256, 512 and 1024 bits) and includes a set of test vectors.

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Usage

Include the header corresponding to the bit size required:

require_once('include/fnv1a_32.inc.php');		// 32 bits
require_once('include/fnv1a_64.inc.php');		// 64 bits
require_once('include/fnv1a_128.inc.php');		// 128 bits
require_once('include/fnv1a_256.inc.php');		// 256 bits
require_once('include/fnv1a_512.inc.php');		// 512 bits
require_once('include/fnv1a_1024.inc.php');		// 1024 bits

Call the function corresponding to the bit size required:

function fnv1a_32_str($string);		// 32 bits
function fnv1a_64_str($string);		// 64 bits
function fnv1a_128_str($string);	// 128 bits
function fnv1a_256_str($string);	// 256 bits
function fnv1a_512_str($string);	// 512 bits
function fnv1a_1024_str($string);	// 1024 bits

The functions take a string as input parameter and returns an hexadecimal string.

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Example

<?php

require_once('include/fnv1a_32.inc.php');
require_once('include/fnv1a_64.inc.php');
require_once('include/fnv1a_128.inc.php');

$string = 'foobar';

echo 'String: ' . $string . PHP_EOL;
echo PHP_EOL;
echo 'FNV1a 32 bits: ' . fnv1a_32_str($string) . PHP_EOL;
echo 'FNV1a 64 bits: ' . fnv1a_64_str($string) . PHP_EOL;
echo 'FNV1a 128 bits: ' . fnv1a_128_str($string) . PHP_EOL;

Will display the following:

String: foobar

FNV1a 32 bits: bf9cf968
FNV1a 64 bits: 85944171f73967e8
FNV1a 128 bits: 343e1662793c64bf6f0d3597ba446f18

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Test vectors

You can use test_vectors.php to test the implementation:

php test_vectors.php

Should return the following:

fnv1a_32_str successfully tested
fnv1a_64_str successfully tested
fnv1a_128_str successfully tested
fnv1a_256_str successfully tested
fnv1a_512_str successfully tested
fnv1a_1024_str successfully tested

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Contributing

Bug reports and suggestions for improvements are most welcome.

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Contact

If you have any questions, comments or suggestions, do not hesitate to contact me at philippe@paquet.email