Mẹo về What is the use of md5 in php? Mới nhất 2022

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You đang tìm kiếm từ khóa What is the use of md5 in php? được Cập Nhật vào lúc : 2022-10-01 12:00:29 . Với phương châm chia sẻ Bí quyết về trong nội dung nội dung bài viết một cách Chi Tiết Mới Nhất. Nếu sau khi đọc tài liệu vẫn ko hiểu thì hoàn toàn hoàn toàn có thể lại Comments ở cuối bài để Admin lý giải và hướng dẫn lại nha.

(PHP 4, PHP 5, PHP 7, PHP 8)

Nội dung chính

    Description
    Return Values
    What is MD5 mostly used for?
    Can we decrypt MD5 in PHP?
    Should MD5 be used?
    What does MD5 mean?

md5 — Calculate the md5 hash of a string

Warning

It is not recommended to use this function to secure passwords, due to the fast nature of this hashing algorithm. See the Password Hashing FAQ for details and best

practices.

Description

md5(string $string, bool $binary = false): string

Parameters

string

The string.

binary

If the optional binary is set to true, then the md5 digest is

instead returned in raw binary format with a length of 16.

Return Values

Returns the hash as a 32-character hexadecimal number.

Examples

Example #1 A md5() example

<?php
$str = ‘apple’;

if (

md5($str) === ‘1f3870be274f6c49b3e31a0c6728957f’) 
    echo “Would you like a green or red apple?”;

?>

See Also

    md5_file() – Calculates the md5 hash of a given file
    sha1_file() – Calculate the sha1 hash of a file
    crc32() – Calculates the crc32 polynomial of a

    string

    sha1() – Calculate the sha1 hash of a string
    hash() – Generate a hash value (message digest)
    crypt() – One-way string hashing
    password_hash() – Creates a password hash

Ray.Paseur sometimes uses Gmail

3 years ago

md5(‘240610708’) == md5(‘QNKCDZO’)

This comparison is true because both md5() hashes start ‘0e’ so PHP type juggling understands these strings to be scientific notation.  By definition, zero raised to any power is zero.

yiminrong yahoo dot ca

1 year ago

Regarding Ray Paseur’s comment, the strings hash to:

0e462097431906509019562988736854
0e830400451993494058024219903391

The odds of getting a hash exactly matching the format /^0+e[0-9]+$/ are not high but are also not negligible.

It should be added as a general warning for all hash functions to always use the triple equals === for comparison.

Actually, the warning should be in the operators section when comparing string values! There are lots of warnings about string comparisons, but nothing specific about the format /^0+e[0-9]+$/.

John

12 years ago

If you want to hash a large amount of data you can use the hash_init/hash_update/hash_final functions.

This allows you to hash chunks/parts/incremental or whatever you like to call it.

Steve M

2 years ago

I’ve found multiple sites suggesting the code:

md5(file_get_contents($filename));

Until recently, I hadn’t noticed any issues with this locally… but then I tried to hash a 700MB file, with a 2048MB memory limit and kept getting out of memory errors…

There appears to be a limit to how long a string the md5() function can handle, and the alternative function is likely more memory efficient anyway. I would highly recommend to all who need file hashing (for detecting duplicates, not security digests) use the md5_file() function and NOT the regular string md5() function!

md5_file($filename);

Note, to those interested, as this was for a local application not a server, I was more concerned with results than memory efficiency. In a live environment, you would never want to read an entire file into memory once when avoidable. ( the time of coding, I did not know of the alternative function)

Shane Allen

19 years ago

From the documentation on Digest::MD5:
md5($data,…)
This function will concatenate all arguments, calculate the MD5 digest of this “message”, and return it in binary form.

md5_hex($data,…)
Same as md5(), but will return the digest in hexadecimal form.

PHP’s function returns the digest in hexadecimal form, so my guess is that you’re using md5() instead of md5_hex(). I have verified that md5_hex() generates the same string as PHP’s md5() function.

(original comment snipped in various places)
>Hexidecimal hashes generated with Perl’s Digest::MD5 module WILL
>NOT equal hashes generated with php’s md5() function if the input
>text contains any non-alphanumeric characters.
>
>$phphash = md5(‘pa$$’);
>echo “php original hash from text: $phphash”;
>echo “md5 hash from perl: ” . $myrow[‘password’];
>
>outputs:
>
>php original hash from text: 0aed5d740d7fab4201e885019a36eace
>hash from perl: c18c9c57cb3658a50de06491a70b75cd

radon8472 radon-software dot

net ¶

6 years ago

<?php
    function raw2hex($rawBinaryChars)
   
      return = array_pop(unpack(‘H*’, $rawBinaryChars));
   
?>

The complement of hey2raw.
You can use to convert from raw md5-format to human-readable format.

This can be usefull to check “Content-Md5” HTTP-Header.

<?php
  $rawMd5    = base64_decode($_SERVER[‘HTTP_CONTENT_MD5’]);
  $post_data = file_get_contents(“php://input”);

  if(

raw2hex($rawMd5) == md5($post_data)) // Post-Data is okay
  else                                    // Post-Data is currupted
?>

hkmaly

4 years ago

Note: Before you get some idea like using md5 with password as way to prevent others tampering with message, read pages “Length extension attack” and “Hash-based message authentication code” on wikipedia. In short, naive constructions can be dangerously insecure. Use hash_hmac if available or reimplement HMAC properly without shortcuts.

What is MD5 mostly used for?

What is MD5 used for? MD5 is primarily used to authenticate files. It’s much easier to use the MD5 hash to check a copy of a file against an original than to check bit by bit to see if the two copies match. MD5 was once used for data security and encryption, but these days its primary use is authentication.

Can we decrypt MD5 in PHP?

How to Decrypt MD5 Passwords in PHP? The MD5 cryptographic algorithm is not reversible i.e. We cannot decrypt a hash value created by the MD5 to get the input back to its original value. So there is no way to decrypt an MD5 password.

Should MD5 be used?

Unfortunately, MD5 has been cryptographically broken and considered insecure. For this reason, it should not be used for anything. Instead, developers should switch to the Secure Hash Algorithm or a Symmetric Cryptographic Algorithm.

What does MD5 mean?

MD5 (Message-Digest algorithm 5) is a widely used cryptographic hash function that results in a 128-bit hash value.

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