Certify key.

In-place editing with a popup if user is allowed in app config file.
User must of course manage at least a private key. User identities of
target key may be selectively chosen. Optionally, certification may be
exportable and non-revocable.

GpgMEWorker.h

@@ -14,7 +14,9 @@
 #include <gpgme++/error.h>
 #include <gpgme++/key.h>
 #include <gpgme++/gpgsetownertrusteditinteractor.h>
+#include <gpgme++/gpgsignkeyeditinteractor.h>
 #include <vector>
+#include "LoopbackPassphraseProvider.h"
 
 using namespace std;
 using namespace GpgME;
@@ -59,9 +61,25 @@ public:
      * @return 
      */
     const Error EditOwnerTrust(const char * anyFullId, GpgME::Key::OwnerTrust trustLevel);
+    /**
+     * Certify (sign) selected key.
+     * @param fprSigningKey
+     * @param fprKeyToSign
+     * @param userIDsToSign : index of each user identity in a vector.
+     * @param options : Exportable (1), Non revocable (2).
+     * \nTrust(4) is not implemented.
+     * @param passphrase
+     * @return 
+     */
+    const Error CertifyKey(const char * fprSigningKey,
+                           const char * fprKeyToSign,
+                           vector<uint>& userIDsToSign, int options,
+                           const string& passphrase);
 
 private:
     Context * m_ctx;
+    // GPG will fetch a password here.
+    LoopbackPassphraseProvider * m_ppp;
 };
 
 /**
@@ -70,14 +88,36 @@ private:
 class SetOwnerTrustEditInteractor : public GpgSetOwnerTrustEditInteractor
 {
 public:
+
     /**
      * 
      * @param ownerTrust : New trust level
      */
     SetOwnerTrustEditInteractor(GpgME::Key::OwnerTrust ownerTrust)
-    : GpgSetOwnerTrustEditInteractor(ownerTrust) {}
+    : GpgSetOwnerTrustEditInteractor(ownerTrust)
+    {
+    }
 
-    virtual ~SetOwnerTrustEditInteractor() {}
+    virtual ~SetOwnerTrustEditInteractor()
+    {
+    }
+
+};
+
+/**
+ * Passed to GPG engine to certify (sign) a key.
+ */
+class SetSignKeyEditInteractor : public GpgSignKeyEditInteractor
+{
+public:
+
+    SetSignKeyEditInteractor() : GpgSignKeyEditInteractor()
+    {
+    };
+
+    virtual ~SetSignKeyEditInteractor()
+    {
+    };
 
 };