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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 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.10, 7.2.0 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
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 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17

Process exited with code 139.
preferences:
271.59 ms | 402 KiB | 354 Q