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+.. This work is licensed under a Creative Commons Attribution 4.0 International License.
+.. http://creativecommons.org/licenses/by/4.0
+
+Certificates
+============
+
+Configuration of Certificates in test environment(For FTP over TLS):
+
+DFC supports two protocols: FTPES and SFTP.
+For FTPES, it is mutual authentication with certificates.
+In our test environment, we use vsftpd to simulate xNF, and we generate self-signed
+keys & certificates on both vsftpd server and DFC.
+
+1. Generate key/certificate with openssl for DFC:
+-------------------------------------------------
+.. code:: bash
+
+    openssl genrsa -out dfc.key 2048
+    openssl req -new -out dfc.csr -key dfc.key
+    openssl x509 -req -days 365 -in dfc.csr -signkey dfc.key -out dfc.crt
+
+2. Generate key & certificate with openssl for vsftpd:
+------------------------------------------------------
+.. code:: bash
+
+   openssl genrsa -out ftp.key 2048
+   openssl req -new -out ftp.csr -key ftp.key
+   openssl x509 -req -days 365 -in ftp.csr -signkey ftp.key -out ftp.crt
+
+3. Configure java keystore in DFC:
+----------------------------------
+We have two keystore files, one for TrustManager, one for KeyManager.
+
+**For TrustManager:**
+
+1. First, convert your certificate in a DER format :
+
+ .. code:: bash
+
+   openssl x509 -outform der -in ftp.crt -out ftp.der
+
+2. And after, import it in the keystore :
+
+ .. code:: bash
+
+   keytool -import -alias ftp -keystore ftp.jks -file ftp.der
+
+**For KeyManager:**
+
+1. First, create a jks keystore:
+
+ .. code:: bash
+
+    keytool -keystore dfc.jks -genkey -alias dfc
+
+2. Second, import dfc.crt and dfc.key to dfc.jks. This is a bit troublesome.
+
+ 1). Step one: Convert x509 Cert and Key to a pkcs12 file
+
+ .. code:: bash
+
+    openssl pkcs12 -export -in dfc.crt -inkey dfc.key -out dfc.p12 -name [some-alias]
+
+ Note: Make sure you put a password on the p12 file - otherwise you'll get a null reference exception when you try to import it.
+
+ Note 2: You might want to add the -chainoption to preserve the full certificate chain.
+
+ 2). Step two: Convert the pkcs12 file to a java keystore:
+
+ .. code:: bash
+
+    keytool -importkeystore -deststorepass [changeit] -destkeypass [changeit] -destkeystore dfc.jks -srckeystore dfc.p12 -srcstoretype PKCS12 -srcstorepass [some-password] -alias [some-alias]
+
+3. Finished
+
+4. Configure vsftpd:
+--------------------
+    update /etc/vsftpd/vsftpd.conf:
+
+  .. code-block:: bash
+
+      rsa_cert_file=/etc/ssl/private/ftp.crt
+      rsa_private_key_file=/etc/ssl/private/ftp.key
+      ssl_enable=YES
+      allow_anon_ssl=NO
+      force_local_data_ssl=YES
+      force_local_logins_ssl=YES
+
+      ssl_tlsv1=YES
+      ssl_sslv2=YES
+      ssl_sslv3=YES
+
+      require_ssl_reuse=NO
+      ssl_ciphers=HIGH
+
+      require_cert=YES
+      ssl_request_cert=YES
+      ca_certs_file=/home/vsftpd/myuser/dfc.crt
+
+5. Configure config/datafile_endpoints.json:
+--------------------------------------------
+   Update the file accordingly:
+
+  .. code-block:: javascript
+
+            "ftpesConfiguration": {
+                "keyCert": "/config/dfc.jks",
+                "keyPassword": "[yourpassword]",
+                "trustedCA": "/config/ftp.jks",
+                "trustedCAPassword": "[yourpassword]"
+            }
+
+6. This has been tested with vsftpd and dfc, with self-signed certificates.
+---------------------------------------------------------------------------
+   In real deployment, we should use ONAP-CA signed certificate for DFC, and vendor-CA signed certificate for xNF