PHP mhash_keygen_s2k() Function

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The mhash_keygen_s2k() function is an in-built function in PHP which is used to generate a key according to the given hash, using a user-provided password. This is the salted S2K algorithm specified in the OpenPGP document (RFC 2440). This function can be used to compute the checksum, message digests, etc.
A Salt is a random piece of data used to generate the key. To check the key, you must also know the salt, so it is a good idea to append the salt too.

Syntax:

 
string mhash_keygen_s2k(int $hash, string $password, 
                string $salt, int $bytes)

Parameter: This function accepts four parameters as mentioned above and described below:

$Hash: This parameter holds the hash ID i.e. one of the mhash_name constants.
$Password: This parameter holds the user’s password.
$Salt: A salt is random data that is used as an additional input to a one-way function that hashes data, a password or passphrase. Salt has a fixed length of 8 bytes and will be padded with zeros if you supply less bytes.
$Bytes: This parameter represents the key length, in bytes.

Return Value: This function returns the generated key as a string, or FALSE on error.

Below program illustrates the mhash_keygen_s2k() function in PHP:

Program:

PHP

<?php 
  
$inputString  = "p4ssw0rd" ; 
$salt = "agejkhgeuka"; 
  
$bytes = "8"; 
  
// bin2hex is used to convert binary 
// to hex string 
  
print_r(bin2hex(mhash_keygen_s2k( 
      MHASH_MD5, $inputString, $salt, $bytes))); 
  
?> 

Output:

e2dfb845290aae21

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