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PHP : Function Reference : hash Functions

hash Functions

Introduction

Message Digest (hash) engine. Allows direct or incremental processing of arbitrary length messages using a variety of hashing algorithms.

Requirements

The Hash extension requires no external libraries and is enabled by default as of PHP 5.1.2. It may be explicitly disabled by using the --disable-hash switch to configure. Earlier versions of PHP may incorporate the Hash extension by installing the PECL module.

Resource Types

This extension defines a Hashing Context resource returned by hash_init().

Predefined Constants

The constants below are defined by this extension, and will only be available when the extension has either been compiled into PHP or dynamically loaded at runtime.

HASH_HMAC (integer)
Optional flag for hash_init(). Indicates that the HMAC digest-keying algorithm should be applied to the current hashing context.

Table of Contents

hash_algos — Return a list of registered hashing algorithms
hash_file — Generate a hash value using the contents of a given file
hash_final — Finalize an incremental hash and return resulting digest
hash_hmac_file — Generate a keyed hash value using the HMAC method and the contents of a given file
hash_hmac — Generate a keyed hash value using the HMAC method
hash_init — Initialize an incremental hashing context
hash_update_file — Pump data into an active hashing context from a file
hash_update_stream — Pump data into an active hashing context from an open stream
hash_update — Pump data into an active hashing context
hash — Generate a hash value (message digest)

Code Examples / Notes » ref.hash

nb_removethis_

Some tests with mhash and hash revealed on my machine that hash needs more than twice as long to create a hash than mhash. The average of one million cylces of Haval128, Haval256, Gost, CRC32, MD5, SHA1 and SHA256 was 450ms for mhash and 1150ms for hash.

rbemrose

martin:  That's because some distributions, such as FreeBSD's ports and Debian's apt split PHP's modules into different packages.

martin

I tried to use Hash() function on my PHP 5.2.3 (FreeBSD 6.2) but there was no Hash() function. (it should be available by default from version 5.1.2)
Hash() function was working after installing "security/pecl-hash" port.


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