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+<?php
+
+/*
+ * This file is part of the Acme PHP project.
+ *
+ * (c) Titouan Galopin <galopintitouan@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace AcmePhp\Ssl;
+
+use AcmePhp\Ssl\Exception\CertificateFormatException;
+use Webmozart\Assert\Assert;
+
+/**
+ * Represent a Certificate.
+ *
+ * @author Jérémy Derussé <jeremy@derusse.com>
+ */
+class Certificate
+{
+    /** @var string */
+    private $certificatePEM;
+
+    /** @var Certificate */
+    private $issuerCertificate;
+
+    public function __construct(string $certificatePEM, self $issuerCertificate = null)
+    {
+        Assert::stringNotEmpty($certificatePEM, __CLASS__.'::$certificatePEM should not be an empty string. Got %s');
+
+        $this->certificatePEM = $certificatePEM;
+        $this->issuerCertificate = $issuerCertificate;
+    }
+
+    /**
+     * @return Certificate[]
+     */
+    public function getIssuerChain(): array
+    {
+        $chain = [];
+        $issuerCertificate = $this->getIssuerCertificate();
+
+        while (null !== $issuerCertificate) {
+            $chain[] = $issuerCertificate;
+            $issuerCertificate = $issuerCertificate->getIssuerCertificate();
+        }
+
+        return $chain;
+    }
+
+    public function getPEM(): string
+    {
+        return $this->certificatePEM;
+    }
+
+    public function getIssuerCertificate(): ?self
+    {
+        return $this->issuerCertificate;
+    }
+
+    /**
+     * @return resource
+     */
+    public function getPublicKeyResource()
+    {
+        if (!$resource = openssl_pkey_get_public($this->certificatePEM)) {
+            throw new CertificateFormatException(sprintf('Failed to convert certificate into public key resource: %s', openssl_error_string()));
+        }
+
+        return $resource;
+    }
+
+    public function getPublicKey(): PublicKey
+    {
+        return new PublicKey(openssl_pkey_get_details($this->getPublicKeyResource())['key']);
+    }
+}