Doc #66564 [NEW]: crypt() seems to silently discard input after a certain length

From: ss23 at ss23 dot geek dot nz Operating system: PHP version: Irrelevant Package: Documentation problem Bug Type: Documentation Problem Bug description:crypt() seems to silently discard input after a certain length Description: ------------ It seems there is a limit to the input length of the password/str parameter to crypt(), however this is not documented anywhere. This has profound security implications, and all users should be aware of the issue. My preference would be a warning/notice triggered when you exceed the length, as well as documentation on this. Test script: --------------- $long = str_repeat('a', 100); var_dump(crypt($long . "1", '$2y$04$saltysaltysaltysaltytt')); var_dump(crypt($long . "2", '$2y$04$saltysaltysaltysaltytt')); var_dump(crypt($long . "12", '$2y$04$saltysaltysaltysaltytt')); Expected result: ---------------- A different hash in each case Actual result: -------------- string(60) "$2y$04$saltysaltysaltysaltyte9usMwh4/IIx0al18sl5oEFVM2Z/XJ7q" string(60) "$2y$04$saltysaltysaltysaltyte9usMwh4/IIx0al18sl5oEFVM2Z/XJ7q" string(60) "$2y$04$saltysaltysaltysaltyte9usMwh4/IIx0al18sl5oEFVM2Z/XJ7q" -- Edit bug report at https://bugs.php.net/bug.php?id=66564&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=66564&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=66564&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=66564&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=66564&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=66564&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=66564&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=66564&r=needscript Try newer version: https://bugs.php.net/fix.php?id=66564&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=66564&r=support Expected behavior: https://bugs.php.net/fix.php?id=66564&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=66564&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=66564&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=66564&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=66564&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=66564&r=dst IIS Stability: https://bugs.php.net/fix.php?id=66564&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=66564&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=66564&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=66564&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=66564&r=mysqlcfg