openssl_digest

(PHP 5 >= 5.3.0, PHP 7)

openssl_digest — Computes a digest

说明

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

本函数还未编写文档，仅有参数列表。

参数

data: The data.
method: The digest method to use, e.g. "sha256", see openssl_get_md_methods() for a list of available digest methods.
raw_output: Setting to TRUE will return as raw output data, otherwise the return value is binhex encoded.

返回值

Returns the digested hash value on success 或者在失败时返回 FALSE.

错误／异常

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

参见

openssl_get_md_methods() - Gets available digest methods

User Contributed Notes

Anonymous 18-Jun-2014 03:07


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.

mwgamera at gmail dot com 13-Aug-2013 08:42


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.

skyblackhawk at yahoo dot it 10-Jun-2011 05:34


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"


}