diff --git a/phpseclib/Crypt/Blowfish.php b/phpseclib/Crypt/Blowfish.php
index 825efcfc..417d5d28 100644
--- a/phpseclib/Crypt/Blowfish.php
+++ b/phpseclib/Crypt/Blowfish.php
@@ -339,7 +339,7 @@ class Blowfish extends BlockCipher
             if ($this->key_length < 16) {
                 return false;
             }
-            self::$cipher_name_openssl_ecb = 'bf-ecb';
+            $this->cipher_name_openssl_ecb = 'bf-ecb';
             $this->cipher_name_openssl = 'bf-' . $this->openssl_translate_mode();
         }
 
diff --git a/phpseclib/Crypt/Common/SymmetricKey.php b/phpseclib/Crypt/Common/SymmetricKey.php
index 605458e0..dacd25f8 100644
--- a/phpseclib/Crypt/Common/SymmetricKey.php
+++ b/phpseclib/Crypt/Common/SymmetricKey.php
@@ -475,7 +475,7 @@ abstract class SymmetricKey
      * @var string
      * @access private
      */
-    protected static $cipher_name_openssl_ecb;
+    protected $cipher_name_openssl_ecb;
 
     /**
      * The default salt used by setPassword()
@@ -1915,7 +1915,7 @@ abstract class SymmetricKey
                 for ($i = 0; $i < strlen($plaintext); $i+=$block_size) {
                     $block = substr($plaintext, $i, $block_size);
                     if (strlen($block) > strlen($buffer['ciphertext'])) {
-                        $buffer['ciphertext'].= openssl_encrypt($xor, static::$cipher_name_openssl_ecb, $key, OPENSSL_RAW_DATA | OPENSSL_ZERO_PADDING);
+                        $buffer['ciphertext'].= openssl_encrypt($xor, $this->cipher_name_openssl_ecb, $key, OPENSSL_RAW_DATA | OPENSSL_ZERO_PADDING);
                     }
                     Strings::increment_str($xor);
                     $otp = Strings::shift($buffer['ciphertext'], $block_size);
@@ -1924,7 +1924,7 @@ abstract class SymmetricKey
             } else {
                 for ($i = 0; $i < strlen($plaintext); $i+=$block_size) {
                     $block = substr($plaintext, $i, $block_size);
-                    $otp = openssl_encrypt($xor, static::$cipher_name_openssl_ecb, $key, OPENSSL_RAW_DATA | OPENSSL_ZERO_PADDING);
+                    $otp = openssl_encrypt($xor, $this->cipher_name_openssl_ecb, $key, OPENSSL_RAW_DATA | OPENSSL_ZERO_PADDING);
                     Strings::increment_str($xor);
                     $ciphertext.= $block ^ $otp;
                 }
@@ -1966,7 +1966,7 @@ abstract class SymmetricKey
             }
         }
         if ($this->continuousBuffer) {
-            $encryptIV = openssl_decrypt($encryptIV, static::$cipher_name_openssl_ecb, $key, OPENSSL_RAW_DATA | OPENSSL_ZERO_PADDING);
+            $encryptIV = openssl_decrypt($encryptIV, $this->cipher_name_openssl_ecb, $key, OPENSSL_RAW_DATA | OPENSSL_ZERO_PADDING);
             if ($overflow) {
                 Strings::increment_str($encryptIV);
             }
@@ -2191,7 +2191,7 @@ abstract class SymmetricKey
                 // that don't we'll emulate it
                 switch ($this->mode) {
                     case self::MODE_CTR:
-                        if (in_array(static::$cipher_name_openssl_ecb, $methods)) {
+                        if (in_array($this->cipher_name_openssl_ecb, $methods)) {
                             $this->openssl_emulate_ctr = true;
                             return true;
                         }
diff --git a/phpseclib/Crypt/DES.php b/phpseclib/Crypt/DES.php
index ed6fb62e..8a277973 100644
--- a/phpseclib/Crypt/DES.php
+++ b/phpseclib/Crypt/DES.php
@@ -613,7 +613,7 @@ class DES extends BlockCipher
     {
         if ($this->key_length_max == 8) {
             if ($engine == self::ENGINE_OPENSSL) {
-                self::$cipher_name_openssl_ecb = 'des-ecb';
+                $this->cipher_name_openssl_ecb = 'des-ecb';
                 $this->cipher_name_openssl = 'des-' . $this->openssl_translate_mode();
             }
         }
diff --git a/phpseclib/Crypt/RC2.php b/phpseclib/Crypt/RC2.php
index 3f337d97..210337a4 100644
--- a/phpseclib/Crypt/RC2.php
+++ b/phpseclib/Crypt/RC2.php
@@ -298,7 +298,7 @@ class RC2 extends BlockCipher
                 if ($this->current_key_length != 128 || strlen($this->orig_key) < 16) {
                     return false;
                 }
-                self::$cipher_name_openssl_ecb = 'rc2-ecb';
+                $this->cipher_name_openssl_ecb = 'rc2-ecb';
                 $this->cipher_name_openssl = 'rc2-' . $this->openssl_translate_mode();
         }
 
diff --git a/phpseclib/Crypt/Rijndael.php b/phpseclib/Crypt/Rijndael.php
index c0b37092..8aafc7a6 100644
--- a/phpseclib/Crypt/Rijndael.php
+++ b/phpseclib/Crypt/Rijndael.php
@@ -308,7 +308,7 @@ class Rijndael extends BlockCipher
                 if ($this->block_size != 16) {
                     return false;
                 }
-                self::$cipher_name_openssl_ecb = 'aes-' . ($this->key_length << 3) . '-ecb';
+                $this->cipher_name_openssl_ecb = 'aes-' . ($this->key_length << 3) . '-ecb';
                 $this->cipher_name_openssl = 'aes-' . ($this->key_length << 3) . '-' . $this->openssl_translate_mode();
                 break;
             case self::ENGINE_MCRYPT:
diff --git a/phpseclib/Crypt/TripleDES.php b/phpseclib/Crypt/TripleDES.php
index 6e640392..3c57d52b 100644
--- a/phpseclib/Crypt/TripleDES.php
+++ b/phpseclib/Crypt/TripleDES.php
@@ -187,7 +187,7 @@ class TripleDES extends DES
     protected function isValidEngineHelper($engine)
     {
         if ($engine == self::ENGINE_OPENSSL) {
-            self::$cipher_name_openssl_ecb = 'des-ede3';
+            $this->cipher_name_openssl_ecb = 'des-ede3';
             $mode = $this->openssl_translate_mode();
             $this->cipher_name_openssl = $mode == 'ecb' ? 'des-ede3' : 'des-ede3-' . $mode;
         }