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hash

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(PHP 5 >= 5.1.2, PHP 7, PECL hash >= 1.1)

hash — Generate a hash value (message digest)

Description

hash ( string $algo , string $data [, bool $raw_output = FALSE ] ) : string

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Parameters

algo

Name of selected hashing algorithm (e.g. "md5", "sha256", "haval160,4", etc..)

data

Message to be hashed.

raw_output

When set to TRUE, outputs raw binary data. FALSE outputs lowercase hexits.

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Return Values

Returns a string containing the calculated message digest as lowercase hexits unless raw_output is set to true in which case the raw binary representation of the message digest is returned.

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Changelog

Version Description
5.4.0 The tiger algorithm now uses big-endian byte ordering. See also example below.

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Examples

Example #1 A hash() example

<?php
echo hash('ripemd160', 'The quick brown fox jumped over the lazy dog.');
?>

The above example will output:

ec457d0a974c48d5685a7efa03d137dc8bbde7e3

Example #2 Calculate pre PHP-5.4 tiger hashes with PHP-5.4 and higher

<?php
function old_tiger($data = "", $width=192, $rounds = 3) {
    return substr(
        implode(
            array_map(
                function ($h) {
                    return str_pad(bin2hex(strrev($h)), 16, "0");
                },
                str_split(hash("tiger192,$rounds", $data, true), 8)
            )
        ),
        0, 48-(192-$width)/4
    );
}
echo hash('tiger192,3', 'a-string'), PHP_EOL;
echo old_tiger('a-string'), PHP_EOL;
?>

Output of the above example in PHP 5.3:

146a7492719b3564094efe7abbd40a7416fd900179d02773
64359b7192746a14740ad4bb7afe4e097327d0790190fd16

Output of the above example in PHP 5.4:

64359b7192746a14740ad4bb7afe4e097327d0790190fd16
146a7492719b3564094efe7abbd40a7416fd900179d02773

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See Also

  • hash_file() - Generate a hash value using the contents of a given file
  • hash_hmac() - Generate a keyed hash value using the HMAC method
  • hash_init() - Initialize an incremental hashing context
  • md5() - Calculate the md5 hash of a string
  • sha1() - Calculate the sha1 hash of a string

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Document created the 30/01/2003, last modified the 26/10/2018
Source of the printed document:https://www.gaudry.be/en/php-rf-hash.html

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References

  1. View the html document Language of the document:fr Manuel PHP : http://php.net

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