Create ExternalCertificateProvider.aidl

app/src/main/aidl/de/blinkt/openvpn/api/ExternalCertificateProvider.aidl

@@ -0,0 +1,39 @@
+// ExternalCertificateProvider.aidl
+package de.blinkt.openvpn.api;
+
+
+/*
+ * This is very simple interface that is specialised to have only the minimal set of crypto
+ * operation that are needed for OpenVPN to authenticate with an external certificate
+ */
+interface ExternalCertificateProvider {
+    /**
+     * Requests signing the data with RSA/ECB/PKCS1PADDING
+     * for RSA certficate and with NONEwithECDSA for EC certificates
+     * @parm alias the parameter that
+     */
+    byte[] getSignedData(in String alias, in byte[] data);
+
+    /**
+     * Requests the certificate chain for the selected alias
+     * The first certifcate returned is assumed to be
+     * the user certificate
+     */
+    byte[] getCertificateChain(in String alias);
+
+    /**
+     * This function is called for the app to get additional meta information from the
+     * external provider and will be called with the stored alias in the app
+     *
+     * For external app provider that do not provide an activity to configure them, this
+     * is used to get the alias that should be used.
+     * The format is the same as the activity should return, i.e.
+     *
+     * EXTRA_ALIAS = "de.blinkt.openvpn.api.KEY_ALIAS"
+     * EXTRA_DESCRIPTION = "de.blinkt.openvpn.api.KEY_DESCRIPTION"
+     *
+     * as the keys for the bundle.
+     *
+     */
+    Bundle getCertificateMetaData(in String alias);
+}