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openssl_digest

(PHP 5 >= 5.3.0, PHP 7, PHP 8)

openssl_digestComputes a digest

Beschreibung

openssl_digest(string $data, string $digest_algo, bool $binary = false): string|false

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

Parameter-Liste

data

The data.

digest_algo

The digest method to use, e.g. "sha256", see openssl_get_md_methods() for a list of available digest methods.

binary

Setting to true will return as raw output data, otherwise the return value is binhex encoded.

Rückgabewerte

Returns the digested hash value on successBei einem Fehler wird false zurückgegeben..

Fehler/Exceptions

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

Siehe auch

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User Contributed Notes 3 notes

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9
mwgamera at gmail dot com
10 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.
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-30
skyblackhawk at yahoo dot it
12 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"
}
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-28
Anonymous
9 years 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.
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