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hash Functions
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LIII. 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.

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)
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