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Merge pull request #740 from terrafrost/x509-serialnumber-1.0

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X509: use a random serial number for 1.0 branch

* terrafrost/x509-serialnumber-1.0:
  X509: add a comment to explain the bitmask
  X509: move where Crypt/Random loading is done
  X509: use a random serial number
This commit is contained in:
Andreas Fischer 2015-07-17 12:30:53 +02:00
commit 12ccc402b1
1 changed files with 20 additions and 1 deletions
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21
phpseclib/File/X509.php
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@ -3277,7 +3277,21 @@ class File_X509
$startDate = !empty($this->startDate) ? $this->startDate : @date('D, d M Y H:i:s O');
$endDate = !empty($this->endDate) ? $this->endDate : @date('D, d M Y H:i:s O', strtotime('+1 year'));
$serialNumber = !empty($this->serialNumber) ? $this->serialNumber : new Math_BigInteger();
if (!empty($this->serialNumber)) {
$serialNumber = $this->serialNumber;
} else {
if (!function_exists('crypt_random_string')) {
include_once 'Crypt/Random.php';
}
/* "The serial number MUST be a positive integer"
"Conforming CAs MUST NOT use serialNumber values longer than 20 octets."
-- https://tools.ietf.org/html/rfc5280#section-4.1.2.2
for the integer to be positive the leading bit needs to be 0 hence the
application of a bitmap
*/
$serialNumber = new Math_BigInteger(crypt_random_string(20) & ("\x7F" . str_repeat("\xFF", 19)), 256);
}
$this->currentCert = array(
'tbsCertificate' =>
@ -3566,6 +3580,11 @@ class File_X509
$crlNumber = $this->serialNumber;
} else {
$crlNumber = $this->getExtension('id-ce-cRLNumber');
// "The CRL number is a non-critical CRL extension that conveys a
// monotonically increasing sequence number for a given CRL scope and
// CRL issuer. This extension allows users to easily determine when a
// particular CRL supersedes another CRL."
// -- https://tools.ietf.org/html/rfc5280#section-5.2.3
$crlNumber = $crlNumber !== false ? $crlNumber->add(new Math_BigInteger(1)) : null;
}