diff --git a/phpseclib/Crypt/RSA.php b/phpseclib/Crypt/RSA.php
index 82ec4c35..8d96c132 100644
--- a/phpseclib/Crypt/RSA.php
+++ b/phpseclib/Crypt/RSA.php
@@ -191,6 +191,10 @@ define('CRYPT_RSA_PRIVATE_FORMAT_PUTTY', 1);
  * XML formatted private key
  */
 define('CRYPT_RSA_PRIVATE_FORMAT_XML', 2);
+/**
+ * PKCS#8 formatted private key
+ */
+define('CRYPT_RSA_PRIVATE_FORMAT_PKCS8', 3);
 /**#@-*/
 
 /**#@+
@@ -846,6 +850,17 @@ class Crypt_RSA
 
                 $RSAPrivateKey = pack('Ca*a*', CRYPT_RSA_ASN1_SEQUENCE, $this->_encodeLength(strlen($RSAPrivateKey)), $RSAPrivateKey);
 
+                if ($this->privateKeyFormat == CRYPT_RSA_PRIVATE_FORMAT_PKCS8) {
+                    $rsaOID = pack('H*', '300d06092a864886f70d0101010500'); // hex version of MA0GCSqGSIb3DQEBAQUA
+                    $RSAPrivateKey = pack('Ca*a*Ca*a*',
+                                          CRYPT_RSA_ASN1_INTEGER, "\01\00", $rsaOID, 4, $this->_encodeLength(strlen($RSAPrivateKey)), $RSAPrivateKey);
+                    $RSAPrivateKey = pack('Ca*a*', CRYPT_RSA_ASN1_SEQUENCE, $this->_encodeLength(strlen($RSAPrivateKey)), $RSAPrivateKey);
+                    $RSAPrivateKey = "-----BEGIN PRIVATE KEY-----\r\n" .
+                                     chunk_split(base64_encode($RSAPrivateKey), 64) .
+                                     '-----END PRIVATE KEY-----';
+                    return $RSAPrivateKey;
+                }
+
                 if (!empty($this->password) || is_string($this->password)) {
                     $iv = crypt_random_string(8);
                     $symkey = pack('H*', md5($this->password . $iv)); // symkey is short for symmetric key
@@ -993,6 +1008,7 @@ class Crypt_RSA
                 }
                 return isset($components['modulus']) && isset($components['publicExponent']) ? $components : false;
             case CRYPT_RSA_PRIVATE_FORMAT_PKCS1:
+            case CRYPT_RSA_PRIVATE_FORMAT_PKCS8:
             case CRYPT_RSA_PUBLIC_FORMAT_PKCS1:
                 /* Although PKCS#1 proposes a format that public and private keys can use, encrypting them is
                    "outside the scope" of PKCS#1.  PKCS#1 then refers you to PKCS#12 and PKCS#15 if you're wanting to
@@ -1083,7 +1099,9 @@ class Crypt_RSA
                     7:d=1  hl=2 l=  13 cons:  SEQUENCE
                     9:d=2  hl=2 l=   9 prim:   OBJECT            :rsaEncryption
                    20:d=2  hl=2 l=   0 prim:   NULL
-                   22:d=1  hl=4 l= 609 prim:  OCTET STRING */
+                   22:d=1  hl=4 l= 609 prim:  OCTET STRING
+
+                   ie. PKCS8 keys*/
 
                 if ($tag == CRYPT_RSA_ASN1_INTEGER && substr($key, 0, 3) == "\x01\x00\x30") {
                     $this->_string_shift($key, 3);