The #2 comment on this comments page (as of Feb 2015) is 9 years old and recommends phpass. If the salt string starts with 'rounds=$', the numeric value of N CRYPT_SHA512 - SHA-512 hash with a sixteen character salt.Any selection of N outside this range will be truncated to The default number of rounds is 5000, there is a minimum ofġ000 and a maximum of 999,999,999. Is used to indicate how many times the hashing loop should be executed, much like the cost CRYPT_SHA256 - SHA-256 hash with a sixteen character salt."$2x$" hashes are potentially weak "$2a$" hashes are compatible and In range 04-31, values outside this range will cause crypt() to fail. The two digit cost parameter is the base-2 logarithm of the iterationĬount for the underlying Blowfish-based hashing algorithm and must be This range in the salt will cause crypt() to return a zero-length string. CRYPT_BLOWFISH - Blowfish hashing with a salt asįollows: "$2a$", "$2x$" or "$2y$", a two digit cost parameter, "$", andĢ2 characters from the alphabet "./0-9A-Za-z".CRYPT_MD5 - MD5 hashing with a twelve character salt starting with. Using invalid characters in the salt will cause crypt() to fail. Each of these 4-character strings encode 24 bits, least significantĬharacter first. The "salt" is aĩ-character string consisting of an underscore followed by 4 characters of iteration countĪnd 4 characters of salt. CRYPT_EXT_DES - Extended DES-based hash.Using invalid characters in the salt will cause CRYPT_STD_DES - Standard DES-based hash with a two character saltįrom the alphabet "./0-9A-Za-z".That start with the same eight characters will generate the same result It also only uses theįirst eight characters of string, so longer strings Salt as the first two characters of the output. The standard DES-based crypt() returns the Longest valid salt allowed by the available hashes. PHP sets aĬonstant named CRYPT_SALT_LENGTH which indicates the The hash type is triggered by the salt argument.Īuto-generate either a standard two character (DES) salt, or a twelveĬharacter (MD5), depending on the availability of MD5 crypt(). password_hash() is a simple crypt() wrapper and compatible with existing password hashes. Password_hash() uses a strong hash, generates a strong salt, and applies proper rounds automatically. Make sure to specify a strong enough salt for better security. However, crypt() creates a weak hash without the salt, and raises an E_NOTICE error without it. Prior to PHP 8.0.0, the salt parameter was optional. Hashes created by crypt() can be used with password_verify() isĬompatible with crypt(). Getting Started Introduction A simple tutorial Language Reference Basic syntax Types Variables Constants Expressions Operators Control Structures Functions Classes and Objects Namespaces Enumerations Errors Exceptions Fibers Generators Attributes References Explained Predefined Variables Predefined Exceptions Predefined Interfaces and Classes Context options and parameters Supported Protocols and Wrappers Security Introduction General considerations Installed as CGI binary Installed as an Apache module Session Security Filesystem Security Database Security Error Reporting User Submitted Data Hiding PHP Keeping Current Features HTTP authentication with PHP Cookies Sessions Dealing with XForms Handling file uploads Using remote files Connection handling Persistent Database Connections Command line usage Garbage Collection DTrace Dynamic Tracing Function Reference Affecting PHP's Behaviour Audio Formats Manipulation Authentication Services Command Line Specific Extensions Compression and Archive Extensions Cryptography Extensions Database Extensions Date and Time Related Extensions File System Related Extensions Human Language and Character Encoding Support Image Processing and Generation Mail Related Extensions Mathematical Extensions Non-Text MIME Output Process Control Extensions Other Basic Extensions Other Services Search Engine Extensions Server Specific Extensions Session Extensions Text Processing Variable and Type Related Extensions Web Services Windows Only Extensions XML Manipulation GUI Extensions Keyboard Shortcuts ? This help j Next menu item k Previous menu item g p Previous man page g n Next man page G Scroll to bottom g g Scroll to top g h Goto homepage g s Goto searchĬrypt( string $string, string $salt): stringĬrypt() will return a hashed string using theĪlternative algorithms.
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