diff --git a/src/Composer/Downloader/PerforceDownloader.php b/src/Composer/Downloader/PerforceDownloader.php
index 8e5f3d01e..325892c32 100644
--- a/src/Composer/Downloader/PerforceDownloader.php
+++ b/src/Composer/Downloader/PerforceDownloader.php
@@ -28,7 +28,25 @@ class PerforceDownloader extends VcsDownloader
         $ref = $package->getSourceReference();
         $label = $package->getPrettyVersion();
 
-        $perforce = new Perforce("", "", $package->getSourceUrl(), $path);
+        $repository = $package->getRepository();
+        //assume repository is a Perforce Repository
+
+        $reflector = new \ReflectionClass($repository);
+        $repoConfigProperty = $reflector->getProperty("repoConfig");
+        $repoConfigProperty->setAccessible(true);
+        $repoConfig = $repoConfigProperty->getValue($repository);
+
+        $p4user = "";
+        if (isset($repoConfig['p4user'])) {
+            $p4user = $repoConfig['p4user'];
+        }
+        $p4password = "";
+        if (isset($repoConfig['p4password'])) {
+            $p4password = $repoConfig['p4password'];
+        }
+
+//        print("Perforce Downloader:doDownload - repoConfig:" . var_dump($repoConfig, true) . "\n\n");
+        $perforce = new Perforce("", "", $package->getSourceUrl(), $path, null, $p4user, $p4password);
         $perforce->setStream($ref);
         $perforce->queryP4User($this->io);
         $perforce->writeP4ClientSpec();
diff --git a/src/Composer/Repository/Vcs/PerforceDriver.php b/src/Composer/Repository/Vcs/PerforceDriver.php
index a1080e5c4..489a0812c 100644
--- a/src/Composer/Repository/Vcs/PerforceDriver.php
+++ b/src/Composer/Repository/Vcs/PerforceDriver.php
@@ -37,10 +37,18 @@ class PerforceDriver extends VcsDriver {
         if (isset($this->repoConfig['branch'])) {
             $this->branch = $this->repoConfig['branch'];
         }
+        $p4user = "";
+        if (isset($this->repoConfig['p4user'])) {
+            $p4user = $this->repoConfig['p4user'];
+        }
+        $p4password = "";
+        if (isset($this->repoConfig['p4password'])) {
+            $p4password = $this->repoConfig['p4password'];
+        }
 
         $repoDir = $this->config->get('cache-vcs-dir') . "/$this->depot";
         if (!isset($this->perforce)) {
-            $this->perforce = new Perforce($this->depot, $this->branch, $this->getUrl(), $repoDir, $this->process);
+            $this->perforce = new Perforce($this->depot, $this->branch, $this->getUrl(), $repoDir, $this->process, $p4user, $p4password);
         }
 
         $this->perforce->p4Login($this->io);
diff --git a/src/Composer/Util/Perforce.php b/src/Composer/Util/Perforce.php
index 6174c5c49..cb46bac81 100644
--- a/src/Composer/Util/Perforce.php
+++ b/src/Composer/Util/Perforce.php
@@ -17,6 +17,7 @@ class Perforce {
     protected $path;
     protected $p4client;
     protected $p4user;
+    protected $p4password;
     protected $p4port;
     protected $p4stream;
     protected $p4clientSpec;
@@ -24,7 +25,7 @@ class Perforce {
     protected $p4branch;
     protected $process;
 
-    public function __construct($depot, $branch, $port, $path, ProcessExecutor $process = null) {
+    public function __construct($depot, $branch, $port, $path, ProcessExecutor $process = null, $p4user = null, $p4password = null) {
         $this->p4depot = $depot;
         $this->p4branch = $branch;
         $this->p4port = $port;
@@ -32,6 +33,14 @@ class Perforce {
         $this->process = $process ? : new ProcessExecutor;
         $fs = new Filesystem();
         $fs->ensureDirectoryExists($path);
+        if (isset($p4user)){
+            $this->p4user = $p4user;
+        } else {
+            $this->p4user = $this->getP4variable("P4USER");
+        }
+        if (isset($p4password)){
+            $this->p4password = $p4password;
+        }
     }
 
     protected function getRandomValue() {
@@ -55,14 +64,6 @@ class Perforce {
         return $this->p4client;
     }
 
-    public function getUser() {
-        if (!isset($this->p4user)) {
-            $this->p4user = $this->getP4variable("P4USER");
-        }
-
-        return $this->p4user;
-    }
-
     protected function getPath() {
         return $this->path;
     }
@@ -100,6 +101,10 @@ class Perforce {
         return $p4clientSpec;
     }
 
+    public function getUser() {
+        return $this->p4user;
+    }
+
     public function queryP4User(IOInterface $io) {
         $this->getUser();
         if (strlen($this->p4user) <= 0) {
@@ -113,11 +118,41 @@ class Perforce {
         }
     }
 
+    protected function getP4variable($name){
+        if (defined('PHP_WINDOWS_VERSION_BUILD')) {
+            $command = "p4 set";
+            $result = $this->executeCommand($command);
+            $resArray = explode("\n", $result);
+            foreach ($resArray as $line) {
+                $fields = explode("=", $line);
+                if (strcmp($name, $fields[0]) == 0){
+                    $index = strpos($fields[1], " ");
+                    if ($index === false){
+                        $value = $fields[1];
+                    } else {
+                        $value = substr($fields[1], 0, $index);
+                    }
+                    $value = trim($value);
+                    return $value;
+                }
+            }
+        } else {
+            $command = 'echo $' . $name;
+            $result = trim($this->executeCommand($command));
+            return $result;
+        }
+
+    }
+
     protected function queryP4Password(IOInterface $io) {
+        if (isset($this->p4password)){
+            return $this->p4password;
+        }
         $password = $this->getP4variable("P4PASSWD");
         if (strlen($password) <= 0) {
             $password = $io->askAndHideAnswer("Enter password for Perforce user " . $this->getUser() . ": ");
         }
+        $this->p4password = $password;
         return $password;
     }
 
@@ -209,31 +244,6 @@ class Perforce {
         fclose($spec);
     }
 
-    protected function getP4variable($name){
-        if (defined('PHP_WINDOWS_VERSION_BUILD')) {
-            $command = "p4 set";
-            $result = $this->executeCommand($command);
-            $resArray = explode("\n", $result);
-            foreach ($resArray as $line) {
-                $fields = explode("=", $line);
-                if (strcmp($name, $fields[0]) == 0){
-                    $index = strpos($fields[1], " ");
-                    if ($index === false){
-                        $value = $fields[1];
-                    } else {
-                        $value = substr($fields[1], 0, $index);
-                    }
-                    $value = trim($value);
-                    return $value;
-                }
-            }
-        } else {
-            $command = 'echo $' . $name;
-            $result = trim($this->executeCommand($command));
-            return $result;
-        }
-
-    }
 
     protected function read($pipe, $name){
         if (feof($pipe)) {