Portable PHP Password Hashing Framework

This is a portable public domain password hashing framework for use in PHP applications. It is meant to work with PHP 3 and above, and it has actually been tested with at least PHP 3.0.18 through 5.3.0 so far.
The preferred (most secure) hashing method supported by phpass is the OpenBSD-style Blowfish-based bcrypt, also supported with our public domain crypt_blowfish package (for C applications), and known in PHP as CRYPT_BLOWFISH, with a fallback to BSDI-style extended DES-based hashes, known in PHP as CRYPT_EXT_DES, and a last resort fallback to MD5-based salted and variable iteration count password hashes implemented in phpass itself (also referred to as portable hashes).
To ensure that the fallbacks will never occur, PHP 5.3.0+ or the Suhosin patch may be used. PHP 5.3.0+ and Suhosin integrate crypt_blowfish into the PHP interpreter such that bcrypt is available for use by PHP scripts even if the host system lacks support for it.
Included in the package are a PHP source file implementing the PasswordHash PHP class, a tiny PHP application demonstrating the use of the PasswordHash class, and a C reimplementation of the portable hashes (used for testing correctness of the primary implementation only).
Download:

These and other related files are also available via FTP.
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We may help you integrate phpass into your applications, please check out our services.

The Authen::Passphrase::PHPass Perl module reimplements the support for portable hashes introduced in phpass, but in Perl.
A cut-down version of phpass (supporting the portable hashes only) has been integrated into phpBB3 (although they have changed the hash type identifier string from "$P$" to "$H$", the hashes are otherwise compatible with those of genuine phpass).
phpass has been integrated into WordPress 2.5+ (more info), as well as bbPress.
A cut-down and reworked version of phpass (supporting the portable hashes only and requiring PHP 5+) has been integrated into development versions of Drupal leading to the upcoming Drupal 7 release (CVS commit 1, commit 2) after a lengthy discussion and many proposed patches against various development versions of Drupal. There's a notion of upgraded hashes - these are phpass portable hashes of md5() hashes (which were used by older versions of Drupal), with the final hash encodings prefixed with a "U" (for "upgraded").
There's also a module for Drupal 5 & 6 that makes the original phpass available with those versions of Drupal, including support for the more secure but not nearly as portable CRYPT_BLOWFISH and CRYPT_EXT_DES hashes.
Finally, there's an extension for the TYPO3 CMS that integrates support for phpass portable hashes into TYPO3 (using Drupal-derived phpass code).
The development of phpass and efforts on getting it into Drupal are partially supported by CivicActions, a Drupal consulting company.
Support further work on this software with donations.

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