openssl_digest

(PHP 5 >= 5.3.0, PHP 7)

openssl_digest — Computes a digest

Description

string openssl_digest ( string $data , string $method [, bool $raw_output = false ] )

Computes a digest hash value for the given data using a given method, and returns a raw or binhex encoded string.

Warning

This function is currently not documented; only its argument list is available.

Parameters

data: The data.
method: The digest method.
raw_output: Setting to TRUE will return as raw output data, otherwise the return value is binhex encoded.

Return Values

Returns the digested hash value on success or FALSE on failure.

Errors/Exceptions

Emits an E_WARNING level error if an unknown signature algorithm is passed via the method parameter.

User Contributed Notes

mwgamera at gmail dot com

2 years ago


The second argument should be one of the values returned by openssl_get_md_methods() rather than hash_algos(). ‘Hash’ and ‘OpenSSL’ are independent extensions and support different selection of digest algorithms. Notably, Hash supports some non-cryptographic hashes like adler or crc.

Anonymous

1 year ago


Hmm.. really @mwgamera? openssl_get_cipher_methods() returns cipher methods but openssl_digest() expects a digest method in the second parameter. However even the docu on this page links to the openssl_get_cipher_methods() method in the "See also" section (however this can be a coincidence). Shouldn't it be a digest method from openssl_get_md_methods() instead openssl_get_cipher_methods()?

I'm not very experienced in cryptography but I don't really understand why you would pass a cipher method to a hash function instead of a digest method.

skyblackhawk at yahoo dot it

4 years ago


Example:

// $fileBuffer is buffer of file in open mode or a generic stream...

$fingerPrint = openssl_digest ($fileBuffer , "sha512");



$method parameter is one of hash_algos() array;



<? echo"<PRE>";

      var_dump(hash_algos());

      echo "</PRE>"

?>



Output:



array(42) {

  [0]=>

  string(3) "md2"

  [1]=>

  string(3) "md4"

  [2]=>

  string(3) "md5"

  [3]=>

  string(4) "sha1"

  [4]=>

  string(6) "sha224"

  [5]=>

  string(6) "sha256"

  [6]=>

  string(6) "sha384"

  [7]=>

  string(6) "sha512"

  [8]=>

  string(9) "ripemd128"

  [9]=>

  string(9) "ripemd160"

  [10]=>

  string(9) "ripemd256"

  [11]=>

  string(9) "ripemd320"

  [12]=>

  string(9) "whirlpool"

  [13]=>

  string(10) "tiger128,3"

  [14]=>

  string(10) "tiger160,3"

  [15]=>

  string(10) "tiger192,3"

  [16]=>

  string(10) "tiger128,4"

  [17]=>

  string(10) "tiger160,4"

  [18]=>

  string(10) "tiger192,4"

  [19]=>

  string(6) "snefru"

  [20]=>

  string(9) "snefru256"

  [21]=>

  string(4) "gost"

  [22]=>

  string(7) "adler32"

  [23]=>

  string(5) "crc32"

  [24]=>

  string(6) "crc32b"

  [25]=>

  string(7) "salsa10"

  [26]=>

  string(7) "salsa20"

  [27]=>

  string(10) "haval128,3"

  [28]=>

  string(10) "haval160,3"

  [29]=>

  string(10) "haval192,3"

  [30]=>

  string(10) "haval224,3"

  [31]=>

  string(10) "haval256,3"

  [32]=>

  string(10) "haval128,4"

  [33]=>

  string(10) "haval160,4"

  [34]=>

  string(10) "haval192,4"

  [35]=>

  string(10) "haval224,4"

  [36]=>

  string(10) "haval256,4"

  [37]=>

  string(10) "haval128,5"

  [38]=>

  string(10) "haval160,5"

  [39]=>

  string(10) "haval192,5"

  [40]=>

  string(10) "haval224,5"

  [41]=>

  string(10) "haval256,5"

}