Add element xenc:AgreementMethod

Author: tvdijen

src/Constants.php

@@ -152,4 +152,7 @@ class Constants extends \SimpleSAML\XML\Constants
     public const XMLENC_ELEMENT = 'http://www.w3.org/2001/04/xmlenc#Element';
     public const XMLENC_ENCRYPTEDKEY = 'http://www.w3.org/2001/04/xmlenc#EncryptedKey';
     public const XMLENC_EXI = 'http://www.w3.org/2009/xmlenc11#EXI';
+
+    // The namespace for the Elliptic Curve Diffie-Hellman Ephemeral Static (ECDH-ES) algorithm
+    public const XMLENC11_ECDH_ES = 'http://www.w3.org/2009/xmlenc11#ECDH-ES';
 }

src/XML/xenc/AbstractAgreementMethodType.php

@@ -0,0 +1,159 @@
+<?php
+
+declare(strict_types=1);
+
+namespace SimpleSAML\XMLSecurity\XML\xenc;
+
+use DOMElement;
+use SimpleSAML\Assert\Assert;
+use SimpleSAML\XML\Exception\InvalidDOMElementException;
+use SimpleSAML\XML\Exception\SchemaViolationException;
+use SimpleSAML\XML\Exception\TooManyElementsException;
+use SimpleSAML\XML\ExtendableElementTrait;
+use SimpleSAML\XML\XsNamespace as NS;
+
+use function array_pop;
+
+/**
+ * A class implementing the xenc:AbstractAgreementMethodType element.
+ *
+ * @package simplesamlphp/xml-security
+ */
+abstract class AbstractAgreementMethodType extends AbstractXencElement
+{
+    use ExtendableElementTrait;
+
+    /** The namespace-attribute for the xs:any element */
+    public const XS_ANY_ELT_NAMESPACE = NS::OTHER;
+
+
+    /**
+     * AgreementMethodType constructor.
+     *
+     * @param string $algorithm
+     * @param \SimpleSAML\XMLSecurity\XML\xenc\KANonce|null $kaNonce
+     * @param \SimpleSAML\XMLSecurity\XML\xenc\OriginatorKeyInfo|null $originatorKeyInfo
+     * @param \SimpleSAML\XMLSecurity\XML\xenc\RecipientKeyInfo|null $recipientKeyInfo
+     * @param list<\SimpleSAML\XML\SerializableElementInterface> $children
+     */
+    final public function __construct(
+        protected string $algorithm,
+        protected ?KANonce $kaNonce = null,
+        protected ?OriginatorKeyInfo $originatorKeyInfo = null,
+        protected ?RecipientKeyInfo $recipientKeyInfo = null,
+        protected array $children = [],
+    ) {
+        Assert::validURI($algorithm, SchemaViolationException::class); // Covers the empty string
+
+        $this->setElements($children);
+    }
+
+
+    /**
+     * Get the URI identifying the algorithm used by this agreement method.
+     *
+     * @return string
+     */
+    public function getAlgorithm(): string
+    {
+        return $this->algorithm;
+    }
+
+
+    /**
+     * Get the KA-Nonce.
+     *
+     * @return \SimpleSAML\XMLSecurity\XML\xenc\KANonce|null
+     */
+    public function getKANonce(): ?KANonce
+    {
+        return $this->kaNonce;
+    }
+
+
+    /**
+     * Get the Originator KeyInfo.
+     *
+     * @return \SimpleSAML\XMLSecurity\XML\xenc\OriginatorKeyInfo|null
+     */
+    public function getOriginatorKeyInfo(): ?OriginatorKeyInfo
+    {
+        return $this->originatorKeyInfo;
+    }
+
+
+    /**
+     * Get the Recipient KeyInfo.
+     *
+     * @return \SimpleSAML\XMLSecurity\XML\xenc\RecipientKeyInfo|null
+     */
+    public function getRecipientKeyInfo(): ?RecipientKeyInfo
+    {
+        return $this->recipientKeyInfo;
+    }
+
+
+    /**
+     * Initialize an AgreementMethod object from an existing XML.
+     *
+     * @param \DOMElement $xml
+     * @return static
+     *
+     * @throws \SimpleSAML\XML\Exception\InvalidDOMElementException
+     *   if the qualified name of the supplied element is wrong
+     * @throws \SimpleSAML\XML\Exception\MissingAttributeException
+     *   if the supplied element is missing one of the mandatory attributes
+     * @throws \SimpleSAML\XML\Exception\TooManyElementsException
+     *   if too many child-elements of a type are specified
+     */
+    public static function fromXML(DOMElement $xml): static
+    {
+        Assert::same($xml->localName, 'AgreementMethod', InvalidDOMElementException::class);
+        Assert::same($xml->namespaceURI, static::NS, InvalidDOMElementException::class);
+
+        $algorithm = self::getAttribute($xml, 'Algorithm');
+
+        $kaNonce = KANonce::getChildrenOfClass($xml);
+        Assert::maxCount($kaNonce, 1, TooManyElementsException::class);
+
+        $originatorKeyInfo = OriginatorKeyInfo::getChildrenOfClass($xml);
+        Assert::maxCount($originatorKeyInfo, 1, TooManyElementsException::class);
+
+        $recipientKeyInfo = RecipientKeyInfo::getChildrenOfClass($xml);
+        Assert::maxCount($recipientKeyInfo, 1, TooManyElementsException::class);
+
+        $children = self::getChildElementsFromXML($xml);
+
+        return new static(
+            $algorithm,
+            array_pop($kaNonce),
+            array_pop($originatorKeyInfo),
+            array_pop($recipientKeyInfo),
+            $children,
+        );
+    }
+
+
+    /**
+     * Convert this AgreementMethod object to XML.
+     *
+     * @param \DOMElement|null $parent The element we should append this AgreementMethod to.
+     * @return \DOMElement
+     */
+    public function toXML(DOMElement $parent = null): DOMElement
+    {
+        $e = $this->instantiateParentElement($parent);
+        $e->setAttribute('Algorithm', $this->getAlgorithm());
+
+        $this->getKANonce()?->toXML($e);
+
+        foreach ($this->getElements() as $child) {
+            $child->toXML($e);
+        }
+
+        $this->getOriginatorKeyInfo()?->toXML($e);
+        $this->getRecipientKeyInfo()?->toXML($e);
+
+        return $e;
+    }
+}

src/XML/xenc/AgreementMethod.php

@@ -0,0 +1,14 @@
+<?php
+
+declare(strict_types=1);
+
+namespace SimpleSAML\XMLSecurity\XML\xenc;
+
+/**
+ * A class implementing the xenc:AgreementMethod element.
+ *
+ * @package simplesamlphp/xml-security
+ */
+final class AgreementMethod extends AbstractAgreementMethodType
+{
+}