diff --git a/phpBB/includes/crypto/driver/bcrypt.php b/phpBB/includes/crypto/driver/bcrypt.php
index 82ff2fb844..d98bf8c940 100644
--- a/phpBB/includes/crypto/driver/bcrypt.php
+++ b/phpBB/includes/crypto/driver/bcrypt.php
@@ -81,6 +81,6 @@ class phpbb_crypto_driver_bcrypt extends phpbb_crypto_driver_base
 	*/
 	protected function get_random_salt()
 	{
-		return substr(str_replace('+', '.', bin2hex(openssl_random_pseudo_bytes(22))), 0, 22);
+		return $this->helper->hash_encode64($this->helper->get_random_salt(22), 22);
 	}
 }
diff --git a/phpBB/includes/crypto/driver/helper.php b/phpBB/includes/crypto/driver/helper.php
index 2931058629..3eafdf1ecc 100644
--- a/phpBB/includes/crypto/driver/helper.php
+++ b/phpBB/includes/crypto/driver/helper.php
@@ -23,6 +23,12 @@ class phpbb_crypto_driver_helper
 	/** @var phpbb_config */
 	protected $driver;
 
+	/**
+	* base64 alphabet
+	* @var string
+	*/
+	public $itoa64 = './0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';
+
 	/**
 	* Constructor of crypto driver helper object
 	*/
@@ -36,11 +42,10 @@ class phpbb_crypto_driver_helper
 	*
 	* @param string $input Input string
 	* @param int $count Input string length
-	* @param string $itoa64 Allowed characters string
 	*
 	* @return string base64 encoded string
 	*/
-	public function hash_encode64($input, $count, &$itoa64)
+	public function hash_encode64($input, $count)
 	{
 		$output = '';
 		$i = 0;
@@ -48,14 +53,14 @@ class phpbb_crypto_driver_helper
 		do
 		{
 			$value = ord($input[$i++]);
-			$output .= $itoa64[$value & 0x3f];
+			$output .= $this->itoa64[$value & 0x3f];
 
 			if ($i < $count)
 			{
 				$value |= ord($input[$i]) << 8;
 			}
 
-			$output .= $itoa64[($value >> 6) & 0x3f];
+			$output .= $this->itoa64[($value >> 6) & 0x3f];
 
 			if ($i++ >= $count)
 			{
@@ -67,14 +72,14 @@ class phpbb_crypto_driver_helper
 				$value |= ord($input[$i]) << 16;
 			}
 
-			$output .= $itoa64[($value >> 12) & 0x3f];
+			$output .= $this->itoa64[($value >> 12) & 0x3f];
 
 			if ($i++ >= $count)
 			{
 				break;
 			}
 
-			$output .= $itoa64[($value >> 18) & 0x3f];
+			$output .= $this->itoa64[($value >> 18) & 0x3f];
 		}
 		while ($i < $count);
 
@@ -105,4 +110,34 @@ class phpbb_crypto_driver_helper
 
 		return substr($val, 4, 16);
 	}
+
+	/**
+	* Get random salt with specified length
+	*
+	* @param int $length Salt length
+	*/
+	public function get_random_salt($length)
+	{
+		$random = '';
+
+		if (($fh = @fopen('/dev/urandom', 'rb')))
+		{
+			$random = fread($fh, $length);
+			fclose($fh);
+		}
+
+		if (strlen($random) < $length)
+		{
+			$random = '';
+			$random_state = $this->helper->unique_id();
+
+			for ($i = 0; $i < $length; $i += 16)
+			{
+				$random_state = md5($this->helper->unique_id() . $random_state);
+				$random .= pack('H*', md5($random_state));
+			}
+			$random = substr($random, 0, $length);
+		}
+		return $random;
+	}
 }
diff --git a/phpBB/includes/crypto/driver/salted_md5.php b/phpBB/includes/crypto/driver/salted_md5.php
index 8e1c8a0d05..1bb7a17afc 100644
--- a/phpBB/includes/crypto/driver/salted_md5.php
+++ b/phpBB/includes/crypto/driver/salted_md5.php
@@ -20,8 +20,6 @@ if (!defined('IN_PHPBB'))
 */
 class phpbb_crypto_driver_salted_md5 extends phpbb_crypto_driver_base
 {
-	protected $itoa = './0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz';
-
 	const PREFIX = '$H$';
 
 	/**
@@ -68,7 +66,7 @@ class phpbb_crypto_driver_salted_md5 extends phpbb_crypto_driver_base
 		while (--$settings['count']);
 
 		$output = $settings['full'];
-		$output .= $this->helper->hash_encode64($hash, 16, $this->itoa);
+		$output .= $this->helper->hash_encode64($hash, 16);
 
 		if (strlen($output) == 34)
 		{
@@ -108,28 +106,11 @@ class phpbb_crypto_driver_salted_md5 extends phpbb_crypto_driver_base
 		$random = '';
 		$count = 6;
 
-		if (($fh = @fopen('/dev/urandom', 'rb')))
-		{
-			$random = fread($fh, $count);
-			fclose($fh);
-		}
-
-		if (strlen($random) < $count)
-		{
-			$random = '';
-			$random_state = $this->helper->unique_id();
-
-			for ($i = 0; $i < $count; $i += 16)
-			{
-				$random_state = md5($this->helper->unique_id() . $random_state);
-				$random .= pack('H*', md5($random_state));
-			}
-			$random = substr($random, 0, $count);
-		}
+		$random = $this->helper->get_random_salt($count);
 
 		$salt = '$H$';
-		$salt .= $this->itoa[min($count + 5, 30)];
-		$salt .= $this->helper->hash_encode64($random, 6, $this->itoa);
+		$salt .= $this->helper->itoa64[min($count + 5, 30)];
+		$salt .= $this->helper->hash_encode64($random, $count);
 
 		return $salt;
 	}
@@ -146,7 +127,7 @@ class phpbb_crypto_driver_salted_md5 extends phpbb_crypto_driver_base
 		{
 			return false;
 		}
-		$count_log2 = strpos($this->itoa, $hash[3]);
+		$count_log2 = strpos($this->helper->itoa64, $hash[3]);
 		$salt = substr($hash, 4, 8);
 
 		if ($count_log2 < 7 || $count_log2 > 30 || strlen($salt) != 8)