diff --git a/phpseclib/Crypt/Blowfish.php b/phpseclib/Crypt/Blowfish.php
index 0db10148..bd46ecf7 100644
--- a/phpseclib/Crypt/Blowfish.php
+++ b/phpseclib/Crypt/Blowfish.php
@@ -381,7 +381,7 @@ class Blowfish extends BlockCipher
             // quoting https://www.openssl.org/news/openssl-3.0-notes.html, OpenSSL 3.0.1
             // "Moved all variations of the EVP ciphers CAST5, BF, IDEA, SEED, RC2, RC4, RC5, and DES to the legacy provider"
             // in theory openssl_get_cipher_methods() should catch this but, on GitHub Actions, at least, it does not
-            if (version_compare(preg_replace('#OpenSSL (\d+\.\d+\.\d+) .*#', '$1', OPENSSL_VERSION_TEXT), '3.0.1', '>=')) {
+            if (defined('OPENSSL_VERSION_TEXT') && version_compare(preg_replace('#OpenSSL (\d+\.\d+\.\d+) .*#', '$1', OPENSSL_VERSION_TEXT), '3.0.1', '>=')) {
                 return false;
             }
             $this->cipher_name_openssl_ecb = 'bf-ecb';
@@ -711,6 +711,42 @@ class Blowfish extends BlockCipher
         return [$x1 & 0xFFFFFFFF ^ $p[17], $x0 & 0xFFFFFFFF];
     }
 
+    /**
+     * Fast helper function for block encryption (32-bit)
+     *
+     * @access private
+     * @param int $x0
+     * @param int $x1
+     * @param int[] $sbox0
+     * @param int[] $sbox1
+     * @param int[] $sbox2
+     * @param int[] $sbox3
+     * @param int[] $p
+     * @return int[]
+     */
+    function _encryptBlockHelperFast32($x0, $x1, $sbox0, $sbox1, $sbox2, $sbox3, $p)
+    {
+        $x0 ^= $p[0];
+        $x1 ^= ((($sbox0[(($x0 & 0xFF000000) >> 24) & 0xFF] + $sbox1[($x0 & 0xFF0000) >> 16]) ^ $sbox2[($x0 & 0xFF00) >> 8]) + $sbox3[$x0 & 0xFF]) ^ $p[1];
+        $x0 ^= ((($sbox0[(($x1 & 0xFF000000) >> 24) & 0xFF] + $sbox1[($x1 & 0xFF0000) >> 16]) ^ $sbox2[($x1 & 0xFF00) >> 8]) + $sbox3[$x1 & 0xFF]) ^ $p[2];
+        $x1 ^= ((($sbox0[(($x0 & 0xFF000000) >> 24) & 0xFF] + $sbox1[($x0 & 0xFF0000) >> 16]) ^ $sbox2[($x0 & 0xFF00) >> 8]) + $sbox3[$x0 & 0xFF]) ^ $p[3];
+        $x0 ^= ((($sbox0[(($x1 & 0xFF000000) >> 24) & 0xFF] + $sbox1[($x1 & 0xFF0000) >> 16]) ^ $sbox2[($x1 & 0xFF00) >> 8]) + $sbox3[$x1 & 0xFF]) ^ $p[4];
+        $x1 ^= ((($sbox0[(($x0 & 0xFF000000) >> 24) & 0xFF] + $sbox1[($x0 & 0xFF0000) >> 16]) ^ $sbox2[($x0 & 0xFF00) >> 8]) + $sbox3[$x0 & 0xFF]) ^ $p[5];
+        $x0 ^= ((($sbox0[(($x1 & 0xFF000000) >> 24) & 0xFF] + $sbox1[($x1 & 0xFF0000) >> 16]) ^ $sbox2[($x1 & 0xFF00) >> 8]) + $sbox3[$x1 & 0xFF]) ^ $p[6];
+        $x1 ^= ((($sbox0[(($x0 & 0xFF000000) >> 24) & 0xFF] + $sbox1[($x0 & 0xFF0000) >> 16]) ^ $sbox2[($x0 & 0xFF00) >> 8]) + $sbox3[$x0 & 0xFF]) ^ $p[7];
+        $x0 ^= ((($sbox0[(($x1 & 0xFF000000) >> 24) & 0xFF] + $sbox1[($x1 & 0xFF0000) >> 16]) ^ $sbox2[($x1 & 0xFF00) >> 8]) + $sbox3[$x1 & 0xFF]) ^ $p[8];
+        $x1 ^= ((($sbox0[(($x0 & 0xFF000000) >> 24) & 0xFF] + $sbox1[($x0 & 0xFF0000) >> 16]) ^ $sbox2[($x0 & 0xFF00) >> 8]) + $sbox3[$x0 & 0xFF]) ^ $p[9];
+        $x0 ^= ((($sbox0[(($x1 & 0xFF000000) >> 24) & 0xFF] + $sbox1[($x1 & 0xFF0000) >> 16]) ^ $sbox2[($x1 & 0xFF00) >> 8]) + $sbox3[$x1 & 0xFF]) ^ $p[10];
+        $x1 ^= ((($sbox0[(($x0 & 0xFF000000) >> 24) & 0xFF] + $sbox1[($x0 & 0xFF0000) >> 16]) ^ $sbox2[($x0 & 0xFF00) >> 8]) + $sbox3[$x0 & 0xFF]) ^ $p[11];
+        $x0 ^= ((($sbox0[(($x1 & 0xFF000000) >> 24) & 0xFF] + $sbox1[($x1 & 0xFF0000) >> 16]) ^ $sbox2[($x1 & 0xFF00) >> 8]) + $sbox3[$x1 & 0xFF]) ^ $p[12];
+        $x1 ^= ((($sbox0[(($x0 & 0xFF000000) >> 24) & 0xFF] + $sbox1[($x0 & 0xFF0000) >> 16]) ^ $sbox2[($x0 & 0xFF00) >> 8]) + $sbox3[$x0 & 0xFF]) ^ $p[13];
+        $x0 ^= ((($sbox0[(($x1 & 0xFF000000) >> 24) & 0xFF] + $sbox1[($x1 & 0xFF0000) >> 16]) ^ $sbox2[($x1 & 0xFF00) >> 8]) + $sbox3[$x1 & 0xFF]) ^ $p[14];
+        $x1 ^= ((($sbox0[(($x0 & 0xFF000000) >> 24) & 0xFF] + $sbox1[($x0 & 0xFF0000) >> 16]) ^ $sbox2[($x0 & 0xFF00) >> 8]) + $sbox3[$x0 & 0xFF]) ^ $p[15];
+        $x0 ^= ((($sbox0[(($x1 & 0xFF000000) >> 24) & 0xFF] + $sbox1[($x1 & 0xFF0000) >> 16]) ^ $sbox2[($x1 & 0xFF00) >> 8]) + $sbox3[$x1 & 0xFF]) ^ $p[16];
+
+        return array($x1 & 0xFFFFFFFF ^ $p[17], $x0 & 0xFFFFFFFF);
+    }
+
     /**
      * Slow helper function for block encryption
      *
diff --git a/phpseclib/Crypt/DES.php b/phpseclib/Crypt/DES.php
index 5f765e30..1ca1853e 100644
--- a/phpseclib/Crypt/DES.php
+++ b/phpseclib/Crypt/DES.php
@@ -581,7 +581,7 @@ class DES extends BlockCipher
                 // quoting https://www.openssl.org/news/openssl-3.0-notes.html, OpenSSL 3.0.1
                 // "Moved all variations of the EVP ciphers CAST5, BF, IDEA, SEED, RC2, RC4, RC5, and DES to the legacy provider"
                 // in theory openssl_get_cipher_methods() should catch this but, on GitHub Actions, at least, it does not
-                if (version_compare(preg_replace('#OpenSSL (\d+\.\d+\.\d+) .*#', '$1', OPENSSL_VERSION_TEXT), '3.0.1', '>=')) {
+                if (defined('OPENSSL_VERSION_TEXT') && version_compare(preg_replace('#OpenSSL (\d+\.\d+\.\d+) .*#', '$1', OPENSSL_VERSION_TEXT), '3.0.1', '>=')) {
                     return false;
                 }
                 $this->cipher_name_openssl_ecb = 'des-ecb';
diff --git a/phpseclib/Crypt/RC2.php b/phpseclib/Crypt/RC2.php
index d8b83247..186d3b2d 100644
--- a/phpseclib/Crypt/RC2.php
+++ b/phpseclib/Crypt/RC2.php
@@ -259,7 +259,7 @@ class RC2 extends BlockCipher
                 // quoting https://www.openssl.org/news/openssl-3.0-notes.html, OpenSSL 3.0.1
                 // "Moved all variations of the EVP ciphers CAST5, BF, IDEA, SEED, RC2, RC4, RC5, and DES to the legacy provider"
                 // in theory openssl_get_cipher_methods() should catch this but, on GitHub Actions, at least, it does not
-                if (version_compare(preg_replace('#OpenSSL (\d+\.\d+\.\d+) .*#', '$1', OPENSSL_VERSION_TEXT), '3.0.1', '>=')) {
+                if (defined('OPENSSL_VERSION_TEXT') && version_compare(preg_replace('#OpenSSL (\d+\.\d+\.\d+) .*#', '$1', OPENSSL_VERSION_TEXT), '3.0.1', '>=')) {
                     return false;
                 }
                 $this->cipher_name_openssl_ecb = 'rc2-ecb';
diff --git a/phpseclib/Crypt/RC4.php b/phpseclib/Crypt/RC4.php
index 32ee41c9..7f586bf4 100644
--- a/phpseclib/Crypt/RC4.php
+++ b/phpseclib/Crypt/RC4.php
@@ -104,7 +104,7 @@ class RC4 extends StreamCipher
             // quoting https://www.openssl.org/news/openssl-3.0-notes.html, OpenSSL 3.0.1
             // "Moved all variations of the EVP ciphers CAST5, BF, IDEA, SEED, RC2, RC4, RC5, and DES to the legacy provider"
             // in theory openssl_get_cipher_methods() should catch this but, on GitHub Actions, at least, it does not
-            if (version_compare(preg_replace('#OpenSSL (\d+\.\d+\.\d+) .*#', '$1', OPENSSL_VERSION_TEXT), '3.0.1', '>=')) {
+            if (defined('OPENSSL_VERSION_TEXT') && version_compare(preg_replace('#OpenSSL (\d+\.\d+\.\d+) .*#', '$1', OPENSSL_VERSION_TEXT), '3.0.1', '>=')) {
                 return false;
             }
             $this->cipher_name_openssl = 'rc4-40';
diff --git a/phpseclib/Math/BigInteger.php b/phpseclib/Math/BigInteger.php
index 276d7af3..b930f4f2 100644
--- a/phpseclib/Math/BigInteger.php
+++ b/phpseclib/Math/BigInteger.php
@@ -766,4 +766,4 @@ class BigInteger implements \JsonSerializable
     {
         return array_map(fn ($val) => new static($val), $this->value->bitwise_split($split));
     }
-}
+}
\ No newline at end of file
diff --git a/phpseclib/Math/BigInteger/Engines/Engine.php b/phpseclib/Math/BigInteger/Engines/Engine.php
index b459d581..21f82921 100644
--- a/phpseclib/Math/BigInteger/Engines/Engine.php
+++ b/phpseclib/Math/BigInteger/Engines/Engine.php
@@ -169,7 +169,7 @@ abstract class Engine implements \JsonSerializable
                     $x = substr($x, 1);
                 }
 
-                $x = preg_replace('#^(?:0x)?([A-Fa-f0-9]*).*#', '$1', $x);
+                $x = preg_replace('#^(?:0x)?([A-Fa-f0-9]*).*#s', '$1', $x);
 
                 $is_negative = false;
                 if ($base < 0 && hexdec($x[0]) >= 8) {
@@ -190,7 +190,7 @@ abstract class Engine implements \JsonSerializable
                 // (?<!^)(?:-).*: find any -'s that aren't at the beginning and then any characters that follow that
                 // (?<=^|-)0*: find any 0's that are preceded by the start of the string or by a - (ie. octals)
                 // [^-0-9].*: find any non-numeric characters and then any characters that follow that
-                $this->value = preg_replace('#(?<!^)-.*|(?<=^|-)0*|[^-0-9].*#', '', (string) $x);
+                $this->value = preg_replace('#(?<!^)-.*|(?<=^|-)0*|[^-0-9].*#s', '', (string) $x);
                 if (!strlen($this->value) || $this->value == '-') {
                     $this->value = '0';
                 }
@@ -203,7 +203,7 @@ abstract class Engine implements \JsonSerializable
                     $x = substr($x, 1);
                 }
 
-                $x = preg_replace('#^([01]*).*#', '$1', $x);
+                $x = preg_replace('#^([01]*).*#s', '$1', $x);
 
                 $temp = new static(Strings::bits2bin($x), 128 * $base); // ie. either -16 or +16
                 $this->value = $temp->value;
diff --git a/tests/Unit/Math/BigInteger/TestCase.php b/tests/Unit/Math/BigInteger/TestCase.php
index 75d63e41..ff4a8e14 100644
--- a/tests/Unit/Math/BigInteger/TestCase.php
+++ b/tests/Unit/Math/BigInteger/TestCase.php
@@ -506,4 +506,18 @@ abstract class TestCase extends PhpseclibTestCase
             $this->assertSame(0, $x->compare($x2));
         }
     }
+
+    public function testHexWithNewLines()
+    {
+        $x = $this->getInstance('0xE932AC92252F585B3A80A4DD76A897C8B7652952FE788F6EC8DD640587A1EE5647670A8AD
+4C2BE0F9FA6E49C605ADF77B5174230AF7BD50E5D6D6D6D28CCF0A886A514CC72E51D209CC7
+72A52EF419F6A953F3135929588EBE9B351FCA61CED78F346FE00DBB6306E5C2A4C6DFC3779
+AF85AB417371CF34D8387B9B30AE46D7A5FF5A655B8D8455F1B94AE736989D60A6F2FD5CADB
+FFBD504C5A756A2E6BB5CECC13BCA7503F6DF8B52ACE5C410997E98809DB4DC30D943DE4E81
+2A47553DCE54844A78E36401D13F77DC650619FED88D8B3926E3D8E319C80C744779AC5D6AB
+E252896950917476ECE5E8FC27D5F053D6018D91B502C4787558A002B9283DA7', 16);
+
+        $y = $this->getInstance('0xE932AC92252F585B3A80A4DD76A897C8B7652952FE788F6EC8DD640587A1EE5647670A8AD', 16);
+        $this->assertSame("$x", "$y");
+    }
 }