PHP 5.6.0beta1 released

openssl_verify

(PHP 4 >= 4.0.4, PHP 5)

openssl_verifyİmzayı doğrular

Açıklama

int openssl_verify ( string $veri , string $imza , mixed $genankim [, int $algoritma ] )

genankim ile ilişkili genel anahtarı kullanarak belirtilen veri için belirtilen imza ile imza doğrulaması yapar.

Değiştirgeler

veri

İmzalı veri.

imza

Doğrulama için kullanılacak imza.

genankim

Genel anahtarı tanımlayıcı kimlik.

algoritma

OPENSSL_ALGO_SHA1 öntanımlıdır. Daha ayrıntılı bilgi için İmzalama Algoritmaları bölümüne bakınız.

Dönen Değerler

İmza doğruysa 1, yanlışsa 0, hata oluşmuşsa -1 döner.

Sürüm Bilgisi

Sürüm: Açıklama
5.0.0 algoritma değiştirgesi eklendi.

Örnekler

Örnek 1 - openssl_verify() örneği

<?php
// $veri ve $imza'nın veriyi ve imzayı içerdiği varsayılıyor

// Genel anahtarı sertifikadan alıp hazırlayalım
$dt fopen("/src/openssl-0.9.6/demos/sign/cert.pem""r");
$sert fread($dt8192);
fclose($dt);
$genankim openssl_get_publickey($sert);

// imza doğru mu, bir bakıbakıverelim
$ok openssl_verify($veri$imza$genankim);
if (
$ok == 1) {
    echo 
"iyi";
} elseif (
$ok == 0) {
    echo 
"kötü";
} else {
    echo 
"çirkin, bir hata oluştu";
}
// Anahtar belleğini serbest bırakalım
openssl_free_key($genankim);
?>

Ayrıca Bakınız

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User Contributed Notes 5 notes

up
1
mikey at badpenguins dot com
3 years ago
I spent days scouring the php openssl documentation trying to figure out how to do what sounds like a simple task - given two PEM encoded certificates, is one the signer of the other?  Nowhere in the openssl_verify() documentation or comments is it explained where to obtain the signature of an existing certificate.  The openssl_x509_parse() function looked promising, but it is an unstable API that may change.

I had to write my own code to determine if one cert signed another, it is located here: http://badpenguins.com/source/misc/isCertSigner.php?viewSource

In a nutshell here is what I learned...

The signature data in a signed X.509 certificate contains DER formatted data about the signature that is encrypted with the signers public key.  The data contains a hash of the original subject certificate and information about what encryption algorithm was used to create the signature.

So you need to get this signature data and a copy of the original certificate with the issuer and signature sequences removed.  Hash a copy of the original certificate (sans issuer/signature sequences) with the same algorithm the issuer used and if the hashes match, you have the issuer cert that signed the certificate.
up
1
steve dot venable at lmco dot com
11 years ago
A note about the openssl_verify() (and some of the other functions).  The public key comes from a certificate in any of the support formats (as the example shows, use openssl_get_publickey() to get the resource id).  But after some trial and error I found the signature string MUST BE BINARY.  While no error occurs, passing a base64-formatted signature string (PEM format?), you simply get a mismatch.  When I did the base64 decode myself, the verify returned a match (return value 1).  You can simply drop the begin/end lines and take the output of the 'base64_decode()' function.
up
0
jeremie dot gomez at gmail dot com
2 years ago
You can actually use the public key as third parameter and not the certificate.

If you can't make it work, make sure that :

1) Your public key is well formatted. It seems that it must have the ----BEGIN PUBLIC KEY---- and ----END PUBLIC KEY----

2) Your signature is in binary format. You can use the php base64_decode for this.
up
0
Stiv
8 years ago
I've finally found a way to verify signature. Sample in the documentation doesn't work. Code bellow DOES work :)

<?php
// $data is assumed to contain the data to be signed

// fetch certificate from file and ready it
$fp = fopen("path/file.pem", "r");
$cert = fread($fp, 8192);
fclose($fp);

// state whether signature is okay or not
// use the certificate, not the public key
$ok = openssl_verify($data, $signature, $cert);
if (
$ok == 1) {
    echo
"good";
} elseif (
$ok == 0) {
    echo
"bad";
} else {
    echo
"ugly, error checking signature";
}
?>
up
0
meint dot post at bigfoot dot com
12 years ago
Anbybody trying to get a Win32 CryptoAPI based digital signature component to work with the openssl_verify() function should be aware that the CryptoAPI PKCS1 (RSA) method uses bytes in reverse order while the openssl_verify() method expects a correctly formatted PKCS1 digital signature (as should be). I learned this the hard way and it took me some time to dig this out. A simple solution in VBScript to reverse the byte order:

N = Len(Blob.Hex)

' reverse bytes in the signature using Hex format
For i = 1 To N - 1 Step 2
    s = Mid(Blob, i, 2) & s
Next

s contains the digital signature in reverse order. Blob is an arbitrary binary container.

Send the signature off in Hex format and use a hex2bin method in PHP to convert to the correct format for openssl_verify(), i.e.

function hex2bin($data) {

    $len = strlen($data);
    return pack("H" . $len, $data);

}

That's it, hope it helps out. BTW I used ASPEncrypt to toy around with on Win32 platform. Works only with Internet Explorer but you could also use a Java applet and have none of the abovementioned problems :-)
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