What are the hash methods in php

Hash methods in php: hash_algos(), hash_copy(), hash_equals(), hash_file(), hash_final(), hash_hkdf(), hash_hmac(), hash_init(), hash(), etc.

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

Hash in php Methods

• hash_algos — Returns a list of registered hash algorithms

• hash_copy — Copies the hash operation context

• hash_equals — String comparison to prevent timing attacks

• hash_file — Generate a hash value for the contents of a specified file

• hash_final — End incremental hashing and return summary results

• hash_hkdf — Generate a HKDF key derivation of a supplied key input

• hmac_algos — Return a list of registered hashing algorithms suitable for hash_hmac

• hash_hmac_file — Generate a keyed hash value using the HMAC method and the contents of the given file

• hash_hmac — Generate hash value with key using HMAC method

• hash_init — Initialize incremental hashing context

• hash_pbkdf2 — Generates a PBKDF2 key export for the supplied password

• hash_update_file — Populates the active hashing context with data from a file

• hash_update_stream — Populate data from an open stream into an active hashing context

• hash_update — Populate data into an active hashing context

• hash — Generate hash value (message digest)

hash_algos()

hash_algos — Return registered hash Algorithm list

Syntax:hash_algos()

Return value: Returns a numerically indexed array containing the names of supported hash algorithms.

hash_copy()

hash_copy — Copy hash operation context

Syntax: hash_copy($context)

• $context: The hash operation context returned by the hash_init() function.

Return value: Returns a copy of the hash operation context.

hash_equals()

hash_equals — String comparison that prevents timing attacks

Syntax: hash_equals($known_string, $user_string)

• $known_string: a string of known length that needs to be compared

• $user_string: a string provided by the user

Return value: Return true when the two strings are equal, otherwise return false.

hash_file()

hash_file — Generate a hash value for the contents of the specified file

Syntax: hash_file($algo,$filename ,$binary = false)

• $algo: The name of the hash algorithm to use (for example: "md5", "sha256", "haval160,4", etc.) . You can check the currently supported algorithms in hash_algos().

• $filename: URL of the file location to be hashed; supports fopen encapsulation protocol.

• $binary: When set to true, original binary data is output. When set to false, a lowercase hexadecimal string is output.

Return value: If binary is set to true, the information summary represented by the original binary data is returned, otherwise the information summary represented by the hexadecimal lowercase string format is returned.

hash_final()

hash_final - End the incremental hash and return the summary result

Syntax: hash_final($context,$ raw_output = false)

• $context: The hash operation context resource returned by the hash_init() function.

• $raw_output: Set to true, the output format is raw binary data. Set to false to output a lowercase hexadecimal string.
  

Return value: If raw_output is set to true, the information summary represented by the original binary data is returned, otherwise the information summary represented by the hexadecimal lowercase string format is returned.

hash_init()

hash_init — Initialize the incremental hash operation context

Syntax: hash_init($algo,$options = 0 , $key = null)

• $algo: The name of the hash algorithm to be used, for example: "md5", "sha256", "haval160,4", etc. How to get a list of supported algorithms, see hash_algos().

• $options: Optional settings for hashing. Currently only one option is supported: HASH_HMAC. When specifying this option, the key parameter must be specified.
  

• $key: When the options parameter is HASH_HMAC, use this parameter to pass in the shared key for HMAC hashing.
  

Return value: Returns the hash operation context object for use by hash_update(), hash_update_stream(), hash_update_file(), and hash_final() functions.

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