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run code in 150+ php & hhvm versions
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<?php $str = ''; $hashes = array(); $salts = array('BCRYPT' => '$2a$04$1234567890123456789012', 'SHA256' => '$5$rounds=1000$usesomesillystringforsalt$','SHA512' => '$6$rounds=1000$usesomesillystringforsalt$', 'MD5' => '$1$rasmusle$'); foreach ($salts as $algo => $salt) { do { $str .= '0'; $hashes[] = crypt($str, $salt); if (count(array_unique($hashes)) === count($hashes)) $allUnique = true; else $allUnique = false; } while($allUnique); echo "Stopped at " . strlen($str) . " characters for salt $algo before truncation was detected...\n\n"; $lst = array_pop($hashes); $stl = array_pop($hashes); echo "$stl\n$lst"; }
Output for 5.3.2 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Stopped at 73 characters for salt BCRYPT before truncation was detected... $2a$04$123456789012345678901ucLrgvM.TkrxjZYl6pfDktLTbZfVhAXy $2a$04$123456789012345678901ucLrgvM.TkrxjZYl6pfDktLTbZfVhAXy
Process exited with code 137.
Output for 5.3.0 - 5.3.1
Stopped at 73 characters for salt BCRYPT before truncation was detected... $2a$04$123456789012345678901ucLrgvM.TkrxjZYl6pfDktLTbZfVhAXy $2a$04$123456789012345678901ucLrgvM.TkrxjZYl6pfDktLTbZfVhAXyStopped at 75 characters for salt SHA256 before truncation was detected... $53G03A9moprc $53G03A9moprcStopped at 77 characters for salt SHA512 before truncation was detected... $6xXnHmACRHmA $6xXnHmACRHmA
Process exited with code 137.
Output for 4.3.0 - 5.2.17

Process exited with code 139.