diff --git a/phpseclib/Crypt/EC/BaseCurves/Binary.php b/phpseclib/Crypt/EC/BaseCurves/Binary.php
index f35c01d2..d984ba4b 100644
--- a/phpseclib/Crypt/EC/BaseCurves/Binary.php
+++ b/phpseclib/Crypt/EC/BaseCurves/Binary.php
@@ -40,7 +40,7 @@ class Binary extends Base
     /**
      * Binary Field Integer factory
      *
-     * @var \phpseclib3\Math\BinaryFields
+     * @var \phpseclib3\Math\BinaryField
      */
     protected $factory;
 
diff --git a/phpseclib/Crypt/EC/BaseCurves/Montgomery.php b/phpseclib/Crypt/EC/BaseCurves/Montgomery.php
index 5f5fdf0e..b4bba650 100644
--- a/phpseclib/Crypt/EC/BaseCurves/Montgomery.php
+++ b/phpseclib/Crypt/EC/BaseCurves/Montgomery.php
@@ -45,7 +45,7 @@ class Montgomery extends Base
     /**
      * Prime Field Integer factory
      *
-     * @var \phpseclib3\Math\PrimeFields
+     * @var \phpseclib3\Math\PrimeField
      */
     protected $factory;
 
diff --git a/phpseclib/File/X509.php b/phpseclib/File/X509.php
index 639a0233..eb122b6b 100644
--- a/phpseclib/File/X509.php
+++ b/phpseclib/File/X509.php
@@ -43,6 +43,7 @@ use phpseclib3\Exception\UnsupportedAlgorithmException;
 use phpseclib3\File\ASN1\Element;
 use phpseclib3\File\ASN1\Maps;
 use phpseclib3\Math\BigInteger;
+use phpseclib3\Crypt\PublicKeyLoader;
 
 /**
  * Pure-PHP X.509 Parser
@@ -303,6 +304,18 @@ class X509
      */
     private static $extensions = [];
 
+    /**
+     * @var ?array
+     * @access private
+     */
+    private $ipAddresses = null;
+
+    /**
+     * @var ?array
+     * @access private
+     */
+    private $domains = null;
+
     /**
      * Default Constructor.
      *
@@ -3690,14 +3703,11 @@ class X509
                     return false;
                 }
                 // If the key is private, compute identifier from its corresponding public key.
-                $key = new RSA();
-                if (!$key->load($raw)) {
-                    return false;   // Not an unencrypted RSA key.
-                }
-                if ($key->getPrivateKey() !== false) {  // If private.
+                $key = PublicKeyLoader::load($raw);
+                if ($key instanceof PrivateKey) {  // If private.
                     return $this->computeKeyIdentifier($key, $method);
                 }
-                $key = $raw;    // Is a public key.
+                $key = $raw; // Is a public key.
                 break;
             case $key instanceof X509:
                 if (isset($key->publicKey)) {
diff --git a/phpseclib/Math/BigInteger/Engines/Engine.php b/phpseclib/Math/BigInteger/Engines/Engine.php
index 05d97431..10dd994b 100644
--- a/phpseclib/Math/BigInteger/Engines/Engine.php
+++ b/phpseclib/Math/BigInteger/Engines/Engine.php
@@ -1139,7 +1139,7 @@ abstract class Engine implements \Serializable
      * Splits BigInteger's into chunks of $split bits
      *
      * @param int $split
-     * @return \phpseclib3\Math\BigInteger\Engine[]
+     * @return \phpseclib3\Math\BigInteger\Engines\Engine[]
      */
     public function bitwise_split($split)
     {
diff --git a/phpseclib/System/SSH/Agent/Identity.php b/phpseclib/System/SSH/Agent/Identity.php
index 9ef02dfa..20b0a958 100644
--- a/phpseclib/System/SSH/Agent/Identity.php
+++ b/phpseclib/System/SSH/Agent/Identity.php
@@ -119,7 +119,7 @@ class Identity implements PrivateKey
      */
     public function withPublicKey($key)
     {
-        if ($key instanceof ECDSA) {
+        if ($key instanceof EC) {
             if (is_array($key->getCurve()) || !isset(self::$curveAliases[$key->getCurve()])) {
                 throw new UnsupportedAlgorithmException('The only supported curves are nistp256, nistp384, nistp512 and Ed25519');
             }
diff --git a/tests/Unit/File/X509/X509Test.php b/tests/Unit/File/X509/X509Test.php
index d8b51313..51b8cb1a 100644
--- a/tests/Unit/File/X509/X509Test.php
+++ b/tests/Unit/File/X509/X509Test.php
@@ -1176,4 +1176,18 @@ qzFkAKWjJj4KjfrbZX4C0Spfxw==
 
         $this->assertIsArray($r);
     }
+
+    /**
+     * @group github1586
+     */
+    public function testComputeKeyIdentifier()
+    {
+        $key = RSA::createKey(512);
+        $key = ASN1::extractBER("$key");
+        $key = ASN1::encodeDER($key, ['type' => ASN1::TYPE_BIT_STRING]);
+        $key = new Element($key);
+
+        $x509 = new X509;
+        $this->assertIsString($x509->computeKeyIdentifier($key));
+    }
 }