php 한글 메뉴얼 도움말 검색 사이트 Generate a hash value (message digest) [function.hash]

설명

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

인수

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.

반환값

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.

변경점

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

예제

Example #1 A hash() example


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

위 예제의 출력:

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;
?>

PHP 5.3에서 위 예제의 출력:

146a7492719b3564094efe7abbd40a7416fd900179d02773
64359b7192746a14740ad4bb7afe4e097327d0790190fd16

PHP 5.4에서 위 예제의 출력:

64359b7192746a14740ad4bb7afe4e097327d0790190fd16
146a7492719b3564094efe7abbd40a7416fd900179d02773

참고

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() - 문자열의 md5 해시를 계산
sha1() - 문자열의 sha1 해시를 계산