PHP - hash

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Metóda - hash

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

The hash() function is used to hash a string. The hashing process creates a fingerprint (e.g. of a password) from which we cannot get the original value. For security reasons, the server should not know the password while authenticating the user but only his fingerprint. When the user enters the password, it creates his fingerprint and compares it with a fingerprint on the server. If they are equal, the user will be logged. Typically, besides the password itself, a so-called salt is added to the function in the form of a constant string.

A list of algorithms:

Algorithm	Number of characters
md2	32
md4	32
md5	32
sha1	40
sha256	64
sha384	96
sha512	128
ripemd128	32
ripemd160	40
ripemd256	64
ripemd320	80
whirlpool	128
tiger128,3	32
tiger160,3	40
tiger192,3	48
tiger128,4	32
tiger160,4	40
tiger192,4	48
snefru	64
gost	64
adler32	8
crc32	8
crc32b	8
haval128,3	32
haval160,3	40
haval192,3	48
haval224,3	56
haval256,3	64
haval128,4	32
haval160,4	40
haval192,4	48
haval224,4	56
haval256,4	64
haval128,5	32
haval160,5	40
haval192,5	48
haval224,5	56
haval256,5	64

The sha algorithm is one of the best, on the other hand, md5 and similar algorithms are now relatively dangerous.

Procedurálne

• function hash (string $algo, string $data, bool $raw_output = false) : string

Parametre

Názov	Dátový typ	Predvolená hodnota	Popis
$algo	string		The hashing algorithm (e.g. md5 or sha512). The list of all algorithms is available below.
$data	string		A value to be hashed.
$raw_output	bool	false	The last optional parameter is to switch binary data (TRUE) and hexadecimal data (FALSE, default).

Mávratovej hodnoty

Vracia: string

The hash of the string.

Príklady

<?php
echo hash('sha512', 'my secret password' . 'my_salt');