09-17-2009
The required OUTPUT is
Quote:
Line::1234567891XYZABC 13/08/09 00:00:00 67890 12345 67890 00
Field1::1234567891
Field2::XYZABC
Field3::13/08/09 00:00:00
Field4::67890
Field5::12345
Field6::67890
Field7::00
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LEARN ABOUT PHP
hash_equals
HASH_EQUALS(3) 1 HASH_EQUALS(3)
hash_equals - Timing attack safe string comparison
SYNOPSIS
bool hash_equals (string $known_string, string $user_string)
DESCRIPTION
Compares two strings using the same time whether they're equal or not.
This function should be used to mitigate timing attacks; for instance, when testing crypt(3) password hashes.
PARAMETERS
o $known_string
- The string of known length to compare against
o $user_string
- The user-supplied string
RETURN VALUES
Returns TRUE when the two strings are equal, FALSE otherwise.
ERRORS
/EXCEPTIONS
Emits an E_WARNING message when either of the supplied parameters is not a string.
EXAMPLES
Example #1
example
<?php
$expected = crypt('12345', '$2a$07$usesomesillystringforsalt$');
$correct = crypt('12345', '$2a$07$usesomesillystringforsalt$');
$incorrect = crypt('apple', '$2a$07$usesomesillystringforsalt$');
var_dump(hash_equals($expected, $correct));
var_dump(hash_equals($expected, $incorrect));
?>
The above example will output:
bool(true)
bool(false)
NOTES
Note
Both arguments must be of the same length to be compared successfully. When arguments of differing length are supplied, FALSE is
returned immediately and the length of the known string may be leaked in case of a timing attack.
Note
It is important to provide the user-supplied string as the second parameter, rather than the first.
PHP Documentation Group HASH_EQUALS(3)