diff --git a/phpseclib/Crypt/Common/Formats/Keys/PKCS8.php b/phpseclib/Crypt/Common/Formats/Keys/PKCS8.php
index 9f540049..818f5a8f 100644
--- a/phpseclib/Crypt/Common/Formats/Keys/PKCS8.php
+++ b/phpseclib/Crypt/Common/Formats/Keys/PKCS8.php
@@ -317,6 +317,9 @@ abstract class PKCS8 extends PKCS
     {
         $decoded = self::preParse($key);
 
+        $isPublic = strpos($key, 'PUBLIC') !== false;
+        $isPrivate = strpos($key, 'PRIVATE') !== false;
+
         $meta = [];
 
         $decrypted = ASN1::asn1map($decoded[0], Maps\EncryptedPrivateKeyInfo::MAP);
@@ -445,6 +448,10 @@ abstract class PKCS8 extends PKCS
 
         $private = ASN1::asn1map($decoded[0], Maps\OneAsymmetricKey::MAP);
         if (is_array($private)) {
+            if ($isPublic) {
+                throw new \UnexpectedValueException('Human readable string claims public key but DER encoded string claims private key');
+            }
+
             if (isset($private['privateKeyAlgorithm']['parameters']) && !$private['privateKeyAlgorithm']['parameters'] instanceof ASN1\Element && isset($decoded[0]['content'][1]['content'][1])) {
                 $temp = $decoded[0]['content'][1]['content'][1];
                 $private['privateKeyAlgorithm']['parameters'] = new ASN1\Element(substr($key, $temp['start'], $temp['length']));
@@ -474,6 +481,10 @@ abstract class PKCS8 extends PKCS
         $public = ASN1::asn1map($decoded[0], Maps\PublicKeyInfo::MAP);
 
         if (is_array($public)) {
+            if ($isPrivate) {
+                throw new \UnexpectedValueException('Human readable string claims private key but DER encoded string claims public key');
+            }
+
             if ($public['publicKey'][0] != "\0") {
                 throw new \UnexpectedValueException('The first byte of the public key should be null - not ' . bin2hex($public['publicKey'][0]));
             }
diff --git a/phpseclib/Crypt/DH/Formats/Keys/PKCS8.php b/phpseclib/Crypt/DH/Formats/Keys/PKCS8.php
index dc5375f2..c330a3c7 100644
--- a/phpseclib/Crypt/DH/Formats/Keys/PKCS8.php
+++ b/phpseclib/Crypt/DH/Formats/Keys/PKCS8.php
@@ -19,7 +19,6 @@
 
 namespace phpseclib3\Crypt\DH\Formats\Keys;
 
-use phpseclib3\Common\Functions\Strings;
 use phpseclib3\Crypt\Common\Formats\Keys\PKCS8 as Progenitor;
 use phpseclib3\File\ASN1;
 use phpseclib3\File\ASN1\Maps;
@@ -62,23 +61,10 @@ abstract class PKCS8 extends Progenitor
      */
     public static function load($key, $password = '')
     {
-        if (!Strings::is_stringable($key)) {
-            throw new \UnexpectedValueException('Key should be a string - not a ' . gettype($key));
-        }
-
-        $isPublic = strpos($key, 'PUBLIC') !== false;
-
         $key = parent::load($key, $password);
 
         $type = isset($key['privateKey']) ? 'privateKey' : 'publicKey';
 
-        switch (true) {
-            case !$isPublic && $type == 'publicKey':
-                throw new \UnexpectedValueException('Human readable string claims non-public key but DER encoded string claims public key');
-            case $isPublic && $type == 'privateKey':
-                throw new \UnexpectedValueException('Human readable string claims public key but DER encoded string claims private key');
-        }
-
         $decoded = ASN1::decodeBER($key[$type . 'Algorithm']['parameters']->element);
         if (empty($decoded)) {
             throw new \RuntimeException('Unable to decode BER of parameters');
diff --git a/phpseclib/Crypt/DSA/Formats/Keys/PKCS8.php b/phpseclib/Crypt/DSA/Formats/Keys/PKCS8.php
index a5858b7e..004881e8 100644
--- a/phpseclib/Crypt/DSA/Formats/Keys/PKCS8.php
+++ b/phpseclib/Crypt/DSA/Formats/Keys/PKCS8.php
@@ -23,7 +23,6 @@
 
 namespace phpseclib3\Crypt\DSA\Formats\Keys;
 
-use phpseclib3\Common\Functions\Strings;
 use phpseclib3\Crypt\Common\Formats\Keys\PKCS8 as Progenitor;
 use phpseclib3\File\ASN1;
 use phpseclib3\File\ASN1\Maps;
@@ -66,23 +65,10 @@ abstract class PKCS8 extends Progenitor
      */
     public static function load($key, $password = '')
     {
-        if (!Strings::is_stringable($key)) {
-            throw new \UnexpectedValueException('Key should be a string - not a ' . gettype($key));
-        }
-
-        $isPublic = strpos($key, 'PUBLIC') !== false;
-
         $key = parent::load($key, $password);
 
         $type = isset($key['privateKey']) ? 'privateKey' : 'publicKey';
 
-        switch (true) {
-            case !$isPublic && $type == 'publicKey':
-                throw new \UnexpectedValueException('Human readable string claims non-public key but DER encoded string claims public key');
-            case $isPublic && $type == 'privateKey':
-                throw new \UnexpectedValueException('Human readable string claims public key but DER encoded string claims private key');
-        }
-
         $decoded = ASN1::decodeBER($key[$type . 'Algorithm']['parameters']->element);
         if (!$decoded) {
             throw new \RuntimeException('Unable to decode BER of parameters');
diff --git a/phpseclib/Crypt/EC/Formats/Keys/PKCS8.php b/phpseclib/Crypt/EC/Formats/Keys/PKCS8.php
index a75162ed..0ec7742f 100644
--- a/phpseclib/Crypt/EC/Formats/Keys/PKCS8.php
+++ b/phpseclib/Crypt/EC/Formats/Keys/PKCS8.php
@@ -23,7 +23,6 @@
 
 namespace phpseclib3\Crypt\EC\Formats\Keys;
 
-use phpseclib3\Common\Functions\Strings;
 use phpseclib3\Crypt\Common\Formats\Keys\PKCS8 as Progenitor;
 use phpseclib3\Crypt\EC\BaseCurves\Base as BaseCurve;
 use phpseclib3\Crypt\EC\BaseCurves\Montgomery as MontgomeryCurve;
@@ -74,23 +73,10 @@ abstract class PKCS8 extends Progenitor
         // one that's called
         self::initialize_static_variables();
 
-        if (!Strings::is_stringable($key)) {
-            throw new \UnexpectedValueException('Key should be a string - not a ' . gettype($key));
-        }
-
-        $isPublic = strpos($key, 'PUBLIC') !== false;
-
         $key = parent::load($key, $password);
 
         $type = isset($key['privateKey']) ? 'privateKey' : 'publicKey';
 
-        switch (true) {
-            case !$isPublic && $type == 'publicKey':
-                throw new \UnexpectedValueException('Human readable string claims non-public key but DER encoded string claims public key');
-            case $isPublic && $type == 'privateKey':
-                throw new \UnexpectedValueException('Human readable string claims public key but DER encoded string claims private key');
-        }
-
         switch ($key[$type . 'Algorithm']['algorithm']) {
             case 'id-Ed25519':
             case 'id-Ed448':
@@ -109,7 +95,7 @@ abstract class PKCS8 extends Progenitor
         $components = [];
         $components['curve'] = self::loadCurveByParam($params);
 
-        if ($isPublic) {
+        if ($type == 'publicKey') {
             $components['QA'] = self::extractPoint("\0" . $key['publicKey'], $components['curve']);
 
             return $components;
diff --git a/phpseclib/Crypt/RSA/Formats/Keys/PKCS8.php b/phpseclib/Crypt/RSA/Formats/Keys/PKCS8.php
index 7ff9a199..1eaac6ef 100644
--- a/phpseclib/Crypt/RSA/Formats/Keys/PKCS8.php
+++ b/phpseclib/Crypt/RSA/Formats/Keys/PKCS8.php
@@ -25,7 +25,6 @@
 
 namespace phpseclib3\Crypt\RSA\Formats\Keys;
 
-use phpseclib3\Common\Functions\Strings;
 use phpseclib3\Crypt\Common\Formats\Keys\PKCS8 as Progenitor;
 use phpseclib3\File\ASN1;
 use phpseclib3\Math\BigInteger;
@@ -67,29 +66,13 @@ abstract class PKCS8 extends Progenitor
      */
     public static function load($key, $password = '')
     {
-        if (!Strings::is_stringable($key)) {
-            throw new \UnexpectedValueException('Key should be a string - not a ' . gettype($key));
-        }
-
-        if (strpos($key, 'PUBLIC') !== false) {
-            $components = ['isPublicKey' => true];
-        } elseif (strpos($key, 'PRIVATE') !== false) {
-            $components = ['isPublicKey' => false];
-        } else {
-            $components = [];
-        }
-
         $key = parent::load($key, $password);
 
         if (isset($key['privateKey'])) {
-            if (!isset($components['isPublicKey'])) {
-                $components['isPublicKey'] = false;
-            }
+            $components['isPublicKey'] = false;
             $type = 'private';
         } else {
-            if (!isset($components['isPublicKey'])) {
-                $components['isPublicKey'] = true;
-            }
+            $components['isPublicKey'] = true;
             $type = 'public';
         }