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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)