Added PSK NULL ciphers from RFC4785
diff --git a/library/ssl_ciphersuites.c b/library/ssl_ciphersuites.c
index d4d96bf..6f5bfff 100644
--- a/library/ssl_ciphersuites.c
+++ b/library/ssl_ciphersuites.c
@@ -118,6 +118,9 @@
     TLS_RSA_WITH_NULL_SHA256,
     TLS_RSA_WITH_NULL_SHA,
     TLS_RSA_WITH_NULL_MD5,
+    TLS_PSK_WITH_NULL_SHA,
+    TLS_DHE_PSK_WITH_NULL_SHA,
+    TLS_RSA_PSK_WITH_NULL_SHA,
 
     0
 };
@@ -487,8 +490,8 @@
 #endif /* POLARSSL_KEY_EXCHANGE_RSA_PSK_ENABLED */
 
 #if defined(POLARSSL_ENABLE_WEAK_CIPHERSUITES)
-#if defined(POLARSSL_KEY_EXCHANGE_RSA_ENABLED)
 #if defined(POLARSSL_CIPHER_NULL_CIPHER)
+#if defined(POLARSSL_KEY_EXCHANGE_RSA_ENABLED)
     { TLS_RSA_WITH_NULL_MD5, "TLS-RSA-WITH-NULL-MD5",
       POLARSSL_CIPHER_NULL, POLARSSL_MD_MD5, POLARSSL_KEY_EXCHANGE_RSA,
       SSL_MAJOR_VERSION_3, SSL_MINOR_VERSION_0,
@@ -506,9 +509,33 @@
       SSL_MAJOR_VERSION_3, SSL_MINOR_VERSION_0,
       SSL_MAJOR_VERSION_3, SSL_MINOR_VERSION_3,
       POLARSSL_CIPHERSUITE_WEAK },
-#endif /* POLARSSL_CIPHER_NULL_CIPHER */
 #endif /* POLARSSL_KEY_EXCHANGE_RSA_ENABLED */
 
+#if defined(POLARSSL_KEY_EXCHANGE_PSK_ENABLED)
+    { TLS_PSK_WITH_NULL_SHA, "TLS-PSK-WITH-NULL-SHA",
+      POLARSSL_CIPHER_NULL, POLARSSL_MD_SHA1, POLARSSL_KEY_EXCHANGE_PSK,
+      SSL_MAJOR_VERSION_3, SSL_MINOR_VERSION_0,
+      SSL_MAJOR_VERSION_3, SSL_MINOR_VERSION_3,
+      POLARSSL_CIPHERSUITE_WEAK },
+#endif /* POLARSSL_KEY_EXCHANGE_PSK_ENABLED */
+
+#if defined(POLARSSL_KEY_EXCHANGE_DHE_PSK_ENABLED)
+    { TLS_DHE_PSK_WITH_NULL_SHA, "TLS-DHE-PSK-WITH-NULL-SHA",
+      POLARSSL_CIPHER_NULL, POLARSSL_MD_SHA1, POLARSSL_KEY_EXCHANGE_DHE_PSK,
+      SSL_MAJOR_VERSION_3, SSL_MINOR_VERSION_0,
+      SSL_MAJOR_VERSION_3, SSL_MINOR_VERSION_3,
+      POLARSSL_CIPHERSUITE_WEAK },
+#endif /* POLARSSL_KEY_EXCHANGE_DHE_PSK_ENABLED */
+
+#if defined(POLARSSL_KEY_EXCHANGE_RSA_PSK_ENABLED)
+    { TLS_RSA_PSK_WITH_NULL_SHA, "TLS-RSA-PSK-WITH-NULL-SHA",
+      POLARSSL_CIPHER_NULL, POLARSSL_MD_SHA1, POLARSSL_KEY_EXCHANGE_RSA_PSK,
+      SSL_MAJOR_VERSION_3, SSL_MINOR_VERSION_0,
+      SSL_MAJOR_VERSION_3, SSL_MINOR_VERSION_3,
+      POLARSSL_CIPHERSUITE_WEAK },
+#endif /* POLARSSL_KEY_EXCHANGE_RSA_PSK_ENABLED */
+#endif /* POLARSSL_CIPHER_NULL_CIPHER */
+
 #if defined(POLARSSL_DES_C)
 #if defined(POLARSSL_KEY_EXCHANGE_DHE_RSA_ENABLED)
     { TLS_DHE_RSA_WITH_DES_CBC_SHA, "TLS-DHE-RSA-WITH-DES-CBC-SHA",