diff --git a/phpseclib/Crypt/RSA.php b/phpseclib/Crypt/RSA.php
index f38a0294..a30ca152 100644
--- a/phpseclib/Crypt/RSA.php
+++ b/phpseclib/Crypt/RSA.php
@@ -943,7 +943,7 @@ class Crypt_RSA {
                     $iv = pack('H*', trim($matches[2]));
                     $symkey = pack('H*', md5($this->password . substr($iv, 0, 8))); // symkey is short for symmetric key
                     $symkey.= substr(pack('H*', md5($symkey . $this->password . $iv)), 0, 8);
-                    $ciphertext = preg_replace('#.+(\r|\n|\r\n)\1|[\r\n]|-.+-#s', '', $key);
+                    $ciphertext = preg_replace('#.+(\r|\n|\r\n)\1|[\r\n]|-.+-| #s', '', $key);
                     $ciphertext = preg_match('#^[a-zA-Z\d/+]*={0,2}$#', $ciphertext) ? base64_decode($ciphertext) : false;
                     if ($ciphertext === false) {
                         $ciphertext = $key;
@@ -981,7 +981,7 @@ class Crypt_RSA {
                     $crypto->setIV($iv);
                     $decoded = $crypto->decrypt($ciphertext);
                 } else {
-                    $decoded = preg_replace('#-.+-|[\r\n]#', '', $key);
+                    $decoded = preg_replace('#-.+-|[\r\n]| #', '', $key);
                     $decoded = preg_match('#^[a-zA-Z\d/+]*={0,2}$#', $decoded) ? base64_decode($decoded) : false;
                 }
 
@@ -1045,10 +1045,10 @@ class Crypt_RSA {
                 $length = $this->_decodeLength($key);
                 $temp = $this->_string_shift($key, $length);
                 if (strlen($temp) != 1 || ord($temp) > 2) {
-                    $components['modulus'] = new Math_BigInteger($temp, -256);
+                    $components['modulus'] = new Math_BigInteger($temp, 256);
                     $this->_string_shift($key); // skip over CRYPT_RSA_ASN1_INTEGER
                     $length = $this->_decodeLength($key);
-                    $components[$type == CRYPT_RSA_PUBLIC_FORMAT_PKCS1 ? 'publicExponent' : 'privateExponent'] = new Math_BigInteger($this->_string_shift($key, $length), -256);
+                    $components[$type == CRYPT_RSA_PUBLIC_FORMAT_PKCS1 ? 'publicExponent' : 'privateExponent'] = new Math_BigInteger($this->_string_shift($key, $length), 256);
 
                     return $components;
                 }
@@ -1056,28 +1056,28 @@ class Crypt_RSA {
                     return false;
                 }
                 $length = $this->_decodeLength($key);
-                $components['modulus'] = new Math_BigInteger($this->_string_shift($key, $length), -256);
+                $components['modulus'] = new Math_BigInteger($this->_string_shift($key, $length), 256);
                 $this->_string_shift($key);
                 $length = $this->_decodeLength($key);
-                $components['publicExponent'] = new Math_BigInteger($this->_string_shift($key, $length), -256);
+                $components['publicExponent'] = new Math_BigInteger($this->_string_shift($key, $length), 256);
                 $this->_string_shift($key);
                 $length = $this->_decodeLength($key);
-                $components['privateExponent'] = new Math_BigInteger($this->_string_shift($key, $length), -256);
+                $components['privateExponent'] = new Math_BigInteger($this->_string_shift($key, $length), 256);
                 $this->_string_shift($key);
                 $length = $this->_decodeLength($key);
-                $components['primes'] = array(1 => new Math_BigInteger($this->_string_shift($key, $length), -256));
+                $components['primes'] = array(1 => new Math_BigInteger($this->_string_shift($key, $length), 256));
                 $this->_string_shift($key);
                 $length = $this->_decodeLength($key);
-                $components['primes'][] = new Math_BigInteger($this->_string_shift($key, $length), -256);
+                $components['primes'][] = new Math_BigInteger($this->_string_shift($key, $length), 256);
                 $this->_string_shift($key);
                 $length = $this->_decodeLength($key);
-                $components['exponents'] = array(1 => new Math_BigInteger($this->_string_shift($key, $length), -256));
+                $components['exponents'] = array(1 => new Math_BigInteger($this->_string_shift($key, $length), 256));
                 $this->_string_shift($key);
                 $length = $this->_decodeLength($key);
-                $components['exponents'][] = new Math_BigInteger($this->_string_shift($key, $length), -256);
+                $components['exponents'][] = new Math_BigInteger($this->_string_shift($key, $length), 256);
                 $this->_string_shift($key);
                 $length = $this->_decodeLength($key);
-                $components['coefficients'] = array(2 => new Math_BigInteger($this->_string_shift($key, $length), -256));
+                $components['coefficients'] = array(2 => new Math_BigInteger($this->_string_shift($key, $length), 256));
 
                 if (!empty($key)) {
                     if (ord($this->_string_shift($key)) != CRYPT_RSA_ASN1_SEQUENCE) {
@@ -1091,13 +1091,13 @@ class Crypt_RSA {
                         $this->_decodeLength($key);
                         $key = substr($key, 1);
                         $length = $this->_decodeLength($key);
-                        $components['primes'][] = new Math_BigInteger($this->_string_shift($key, $length), -256);
+                        $components['primes'][] = new Math_BigInteger($this->_string_shift($key, $length), 256);
                         $this->_string_shift($key);
                         $length = $this->_decodeLength($key);
-                        $components['exponents'][] = new Math_BigInteger($this->_string_shift($key, $length), -256);
+                        $components['exponents'][] = new Math_BigInteger($this->_string_shift($key, $length), 256);
                         $this->_string_shift($key);
                         $length = $this->_decodeLength($key);
-                        $components['coefficients'][] = new Math_BigInteger($this->_string_shift($key, $length), -256);
+                        $components['coefficients'][] = new Math_BigInteger($this->_string_shift($key, $length), 256);
                     }
                 }
 
@@ -1875,7 +1875,7 @@ class Crypt_RSA {
 
         $result = 0;
         for ($i = 0; $i < strlen($x); $i++) {
-            $result |= $x[$i] ^ $y[$i];
+            $result |= ord($x[$i]) ^ ord($y[$i]);
         }
 
         return $result == 0;