GoLang hash_init

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PHP hash_init

PHP original manual for hash_init [ show | php.net ]

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

hash_init — Initialize an incremental hashing context

HashContext hash_init ( string $algo [, int $options = 0 [, string $key = NULL ]] )

algo: Name of selected hashing algorithm (i.e. "md5", "sha256", "haval160,4", etc..). For a list of supported algorithms see hash_algos().
options: Optional settings for hash generation, currently supports only one option: HASH_HMAC. When specified, the key must be specified.
key: When HASH_HMAC is specified for options, a shared secret key to be used with the HMAC hashing method must be supplied in this parameter.

Version	Description
7.2.0	Usage of non-cryptographic hash functions (adler32, crc32, crc32b, fnv132, fnv1a32, fnv164, fnv1a64, joaat) with `HASH_HMAC` was disabled.
7.2.0	Return HashContext instead of resource.

Example #1 Incremental hashing example


<?php
$ctx = hash_init('md5');
hash_update($ctx, 'The quick brown fox ');
hash_update($ctx, 'jumped over the lazy dog.');
echo hash_final($ctx);
?>

The above example will output:

5c6ffbdd40d9556b73a21e63c3e0e904