use realpath to check files that be loaded through realpath

Author: miladrahimi

src/Cryptography/Keys/EcdsaPrivateKey.php

@@ -24,7 +24,7 @@ class EcdsaPrivateKey
      */
     public function __construct(string $key, string $passphrase = '', ?string $id = null)
     {
-        $content = file_exists($key) ? file_get_contents(realpath($key)) : $key;
+        $content = realpath($key) ? file_get_contents(realpath($key)) : $key;
 
         $this->resource = openssl_pkey_get_private($content, $passphrase);
         if ($this->resource === false) {

src/Cryptography/Keys/EcdsaPublicKey.php

@@ -23,7 +23,7 @@ class EcdsaPublicKey
      */
     public function __construct(string $key, ?string $id = null)
     {
-        $content = file_exists($key) ? file_get_contents(realpath($key)) : $key;
+        $content = realpath($key) ? file_get_contents(realpath($key)) : $key;
 
         $this->resource = openssl_pkey_get_public($content);
         if ($this->resource === false) {

src/Cryptography/Keys/RsaPrivateKey.php

@@ -24,7 +24,7 @@ class RsaPrivateKey
      */
     public function __construct(string $key, string $passphrase = '', ?string $id = null)
     {
-        $content = file_exists($key) ? file_get_contents(realpath($key)) : $key;
+        $content = realpath($key) ? file_get_contents(realpath($key)) : $key;
 
         $this->resource = openssl_pkey_get_private($content, $passphrase);
         if ($this->resource === false) {

src/Cryptography/Keys/RsaPublicKey.php

@@ -23,7 +23,7 @@ class RsaPublicKey
      */
     public function __construct(string $key, ?string $id = null)
     {
-        $content = file_exists($key) ? file_get_contents(realpath($key)) : $key;
+        $content = realpath($key) ? file_get_contents(realpath($key)) : $key;
 
         $this->resource = openssl_pkey_get_public($content);
         if ($this->resource === false) {