Sop/ASN1 PHP Library

Sop/ASN1 PHP Library

A PHP library for X.690 ASN.1 DER encoding and decoding for Joomla 3 and Joomla 4

Including ASN1 php library in Joomla

There is code example for Joomla 3 and Joomla 4.

defined('_JEXEC') or die('Restricted access');
use \Sop\ASN1\Element;
use \Sop\ASN1\Type\Constructed\Sequence;

// For Joomla 3

JLoader::registerNamespace('Sop', JPATH_LIBRARIES);

// OR 
// for Joomla 4
JLoader::registerNamespace('Sop', JPATH_LIBRARIES. '/Sop');

Joomla ASN1 PHP Library

A PHP library for X.690 Abstract Syntax Notation One (ASN.1) Distinguished Encoding Rules (DER) encoding and decoding.


  • PHP >=7.2
  • gmp
  • mbstring


This library is available on Packagist.

composer require sop/asn1


The general idea is that each ASN.1 type has its corresponding PHP class, that knows the details of encoding and decoding the specific type.

To decode DER data, use fromDER static method of the expected type. To encode object to DER, use toDER instance method.

Many methods return an UnspecifiedType object, that works as an intermediate wrapper with accessor methods ensuring type safety.

All objects are immutable and method chaining is promoted for the fluency of the API. Exception shall be thrown on errors.

Code Examples

Here are some simple usage examples. Namespaces are omitted for brevity.


Encode a sequence containing a UTF-8 string, an integer and an explicitly tagged object identifier, conforming to the following ASN.1 specification:

Example ::= SEQUENCE {
    greeting    UTF8String,
    answer      INTEGER,


$seq = new Sequence(
    new UTF8String('Hello'),
    new Integer(42),
    new ExplicitlyTaggedType(
        1, new ObjectIdentifier(''))
$der = $seq->toDER();


Decode DER encoding from above.

$seq = UnspecifiedType::fromDER($der)->asSequence();
$greeting = $seq->at(0)->asUTF8String()->string();
$answer = $seq->at(1)->asInteger()->intNumber();
$type = $seq->at(2)->asTagged()->asExplicit()->asObjectIdentifier()->oid();

Real-World Examples

See the following for more practical real-world usage examples.

ASN.1 References

  • Extension type: Library
  • Joomla version: 4.0

SOP/ASN1 Library v.4.1.1

Version from 17.02.2022

2022-03-17 23:14:34

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