diff --git a/src/kleo/predicates.h b/src/kleo/predicates.h
index 3b04f4b6e..ebad33317 100644
--- a/src/kleo/predicates.h
+++ b/src/kleo/predicates.h
@@ -1,188 +1,189 @@
 /* -*- mode: c++; c-basic-offset:4 -*-
     models/predicates.h
 
     This file is part of Kleopatra, the KDE keymanager
     SPDX-FileCopyrightText: 2007 Klarälvdalens Datakonsult AB
 
     SPDX-License-Identifier: GPL-2.0-or-later
 */
 
 #ifndef __KLEOPATRA_MODELS_PREDICATES_H__
 #define __KLEOPATRA_MODELS_PREDICATES_H__
 
 #include <gpgme++/key.h>
 
 #include <string>
 #include <cstring>
 #include <algorithm>
 #include <iterator>
 #include <functional>
 
 namespace Kleo
 {
 namespace _detail
 {
 
 inline int mystrcmp(const char *s1, const char *s2)
 {
     using namespace std;
     return s1 ? s2 ? strcmp(s1, s2) : 1 : s2 ? -1 : 0;
 }
 
 #define make_comparator_str_impl( Name, expr, cmp )                     \
     template <template <typename U> class Op>                           \
     struct Name {                                                       \
         typedef bool result_type;                                       \
         \
         bool operator()( const char * lhs, const char * rhs ) const {   \
             return Op<int>()( cmp, 0 );                                 \
         }                                                               \
         \
         bool operator()( const std::string & lhs, const std::string & rhs ) const { \
             return operator()( lhs.c_str(), rhs.c_str() );              \
         }                                                               \
         bool operator()( const char * lhs, const std::string & rhs ) const { \
             return operator()( lhs, rhs.c_str() );                      \
         }                                                               \
         bool operator()( const std::string & lhs, const char * rhs ) const { \
             return operator()( lhs.c_str(), rhs );                      \
         }                                                               \
         \
         template <typename T>                                           \
         bool operator()( const T & lhs, const T & rhs ) const {         \
             return operator()( (lhs expr), (rhs expr) );                \
         }                                                               \
         template <typename T>                                           \
         bool operator()( const T & lhs, const char * rhs ) const {      \
             return operator()( (lhs expr), rhs );                       \
         }                                                               \
         template <typename T>                                           \
         bool operator()( const char * lhs, const T & rhs ) const {      \
             return operator()( lhs, (rhs expr) );                       \
         }                                                               \
         template <typename T>                                           \
         bool operator()( const T & lhs, const std::string & rhs ) const { \
             return operator()( (lhs expr), rhs );                       \
         }                                                               \
         template <typename T>                                           \
         bool operator()( const std::string & lhs, const T & rhs ) const {    \
             return operator()( lhs, (rhs expr) );                       \
         }                                                               \
     }
 
 #define make_comparator_str_fast( Name, expr )                          \
     make_comparator_str_impl( Name, expr, _detail::mystrcmp( lhs, rhs ) )
 #define make_comparator_str( Name, expr )                               \
     make_comparator_str_impl( Name, expr, qstricmp( lhs, rhs ) )
 
 make_comparator_str_fast(ByFingerprint, .primaryFingerprint());
 make_comparator_str_fast(ByKeyID, .keyID());
 make_comparator_str_fast(ByShortKeyID, .shortKeyID());
 make_comparator_str_fast(ByChainID, .chainID());
+make_comparator_str_fast(ByKeyGrip, .keyGrip());
 
 template <typename T>
 void sort_by_fpr(T &t)
 {
     std::sort(t.begin(), t.end(), ByFingerprint<std::less>());
 }
 
 template <typename T>
 void remove_duplicates_by_fpr(T &t)
 {
     t.erase(std::unique(t.begin(), t.end(), ByFingerprint<std::equal_to>()), t.end());
 }
 
 template <typename T>
 T union_by_fpr(const T &t1, const T &t2)
 {
     T result;
     result.reserve(t1.size() + t2.size());
     std::set_union(t1.begin(), t1.end(),
                    t2.begin(), t2.end(),
                    std::back_inserter(result),
                    ByFingerprint<std::less>());
     return result;
 }
 
 template <typename T>
 T union_by_fpr_dirty(const T &t1, const T &t2)
 {
     T cleaned(t1);
     sort_by_fpr(cleaned);
     remove_duplicates_by_fpr(cleaned);
     return union_by_fpr(cleaned, t2);
 }
 
 template <typename T>
 void grep_protocol(T &t, GpgME::Protocol proto)
 {
     t.erase(std::remove_if(t.begin(), t.end(),
                            [proto](const GpgME::Key &key) {
                                return key.protocol() != proto;
                            }), t.end());
 }
 
 template <typename T>
 bool any_protocol(const T &t, GpgME::Protocol proto)
 {
     return std::any_of(t.cbegin(), t.cend(),
                        [proto](const GpgME::Key &key) {
                            return key.protocol() == proto;
                        });
 }
 
 template <typename T>
 bool all_protocol(const T &t, GpgME::Protocol proto)
 {
     return std::all_of(t.cbegin(), t.cend(), 
                        [proto](const GpgME::Key &key) {
                          return key.protocol() == proto;
                        });
 }
 
 template <typename T>
 bool none_of_protocol(const T &t, GpgME::Protocol proto)
 {
     return std::none_of(t.cbegin(), t.cend(),
                         [proto](const GpgME::Key &key) {
                             return key.protocol() == proto;
                         });
 }
 
 template <typename T>
 void grep_secret(T &t)
 {
     t.erase(std::remove_if(t.begin(), t.end(), std::mem_fn(&GpgME::Key::hasSecret)), t.end());
 }
 
 template <typename T>
 bool any_secret(const T &t)
 {
     return std::any_of(t.cbegin(), t.cend(), std::mem_fn(&GpgME::Key::hasSecret));
 }
 
 template <typename T>
 bool all_secret(const T &t)
 {
     return std::all_of(t.cbegin(), t.cend(), std::mem_fn(&GpgME::Key::hasSecret));
 }
 
 template <typename T>
 bool none_of_secret(const T &t)
 {
     return std::none_of(t.cbegin(), t.cend(), std::mem_fn(&GpgME::Key::hasSecret));
 }
 
 template <typename T>
 void grep_can_encrypt(T &t)
 {
     t.erase(std::remove_if(t.begin(), t.end(),
                            [](const GpgME::Key &key) {
                                return !key.canEncrypt();
                            }), t.end());
 }
 
 }
 }
 
 #endif /* __KLEOPATRA_MODELS_PREDICATES_H__ */
diff --git a/src/models/keycache.cpp b/src/models/keycache.cpp
index ba6367b82..67ec27149 100644
--- a/src/models/keycache.cpp
+++ b/src/models/keycache.cpp
@@ -1,1311 +1,1355 @@
 /* -*- mode: c++; c-basic-offset:4 -*-
     models/keycache.cpp
 
     This file is part of Kleopatra, the KDE keymanager
     SPDX-FileCopyrightText: 2007, 2008 Klarälvdalens Datakonsult AB
     SPDX-FileCopyrightText: 2018 Intevation GmbH
+    SPDX-FileCopyrightText: 2020 g10 Code GmbH
+    SPDX-FileContributor: Ingo Klöcker <dev@ingo-kloecker.de>
 
     SPDX-License-Identifier: GPL-2.0-or-later
 */
 
 #include "keycache.h"
 #include "keycache_p.h"
 
 #include "libkleo_debug.h"
 
 #include "kleo/predicates.h"
 #include "kleo/stl_util.h"
 #include "kleo/dn.h"
 #include "utils/filesystemwatcher.h"
 
 #include <gpgme++/error.h>
 #include <gpgme++/context.h>
 #include <gpgme++/key.h>
 #include <gpgme++/decryptionresult.h>
 #include <gpgme++/verificationresult.h>
 #include <gpgme++/keylistresult.h>
 
 #include <qgpgme/protocol.h>
 #include <qgpgme/listallkeysjob.h>
 #include <qgpgme/cryptoconfig.h>
 
 #include <gpg-error.h>
 
 //#include <kmime/kmime_header_parsing.h>
 
 
 #include <QPointer>
 #include <QTimer>
 #include <QEventLoop>
 
 #include <utility>
 #include <algorithm>
 #include <functional>
 #include <iterator>
 
 using namespace Kleo;
 using namespace GpgME;
 using namespace KMime::Types;
 
 static const unsigned int hours2ms = 1000 * 60 * 60;
 
 //
 //
 // KeyCache
 //
 //
 
 namespace
 {
 
 make_comparator_str(ByEMail, .first.c_str());
 
 }
 
 class KeyCache::Private
 {
     friend class ::Kleo::KeyCache;
     KeyCache *const q;
 public:
     explicit Private(KeyCache *qq) : q(qq), m_refreshInterval(1), m_initalized(false), m_pgpOnly(true), m_remarks_enabled(false)
     {
         connect(&m_autoKeyListingTimer, &QTimer::timeout, q, [this]() { q->startKeyListing(); });
         updateAutoKeyListingTimer();
     }
 
     ~Private()
     {
         if (m_refreshJob) {
             m_refreshJob->cancel();
         }
     }
 
     template < template <template <typename U> class Op> class Comp>
     std::vector<Key>::const_iterator find(const std::vector<Key> &keys, const char *key) const
     {
         ensureCachePopulated();
         const std::vector<Key>::const_iterator it =
             std::lower_bound(keys.begin(), keys.end(), key, Comp<std::less>());
         if (it == keys.end() || Comp<std::equal_to>()(*it, key)) {
             return it;
         } else {
             return keys.end();
         }
     }
 
     template < template <template <typename U> class Op> class Comp>
     std::vector<Subkey>::const_iterator find(const std::vector<Subkey> &keys, const char *key) const
     {
         ensureCachePopulated();
         const std::vector<Subkey>::const_iterator it =
             std::lower_bound(keys.begin(), keys.end(), key, Comp<std::less>());
         if (it == keys.end() || Comp<std::equal_to>()(*it, key)) {
             return it;
         } else {
             return keys.end();
         }
     }
 
     std::vector<Key>::const_iterator find_fpr(const char *fpr) const
     {
         return find<_detail::ByFingerprint>(by.fpr, fpr);
     }
 
     std::pair< std::vector< std::pair<std::string, Key> >::const_iterator,
         std::vector< std::pair<std::string, Key> >::const_iterator >
         find_email(const char *email) const
     {
         ensureCachePopulated();
         return std::equal_range(by.email.begin(), by.email.end(),
                                 email, ByEMail<std::less>());
     }
 
     std::vector<Key> find_mailbox(const QString &email, bool sign) const;
 
+    std::vector<Subkey>::const_iterator find_keygrip(const char *keygrip) const
+    {
+        return find<_detail::ByKeyGrip>(by.keygrip, keygrip);
+    }
+
     std::vector<Subkey>::const_iterator find_subkeyid(const char *subkeyid) const
     {
         return find<_detail::ByKeyID>(by.subkeyid, subkeyid);
     }
 
     std::vector<Key>::const_iterator find_keyid(const char *keyid) const
     {
         return find<_detail::ByKeyID>(by.keyid, keyid);
     }
 
     std::vector<Key>::const_iterator find_shortkeyid(const char *shortkeyid) const
     {
         return find<_detail::ByShortKeyID>(by.shortkeyid, shortkeyid);
     }
 
     std::pair <
     std::vector<Key>::const_iterator,
         std::vector<Key>::const_iterator
         > find_subjects(const char *chain_id) const
     {
         ensureCachePopulated();
         return std::equal_range(by.chainid.begin(), by.chainid.end(),
                                 chain_id, _detail::ByChainID<std::less>());
     }
 
     void refreshJobDone(const KeyListResult &result);
 
     void setRefreshInterval(int interval)
     {
         m_refreshInterval = interval;
         updateAutoKeyListingTimer();
     }
 
     int refreshInterval() const
     {
         return m_refreshInterval;
     }
 
     void updateAutoKeyListingTimer()
     {
         setAutoKeyListingInterval(hours2ms * m_refreshInterval);
     }
     void setAutoKeyListingInterval(int ms)
     {
         m_autoKeyListingTimer.stop();
         m_autoKeyListingTimer.setInterval(ms);
         if (ms != 0) {
             m_autoKeyListingTimer.start();
         }
     }
 
     void ensureCachePopulated() const;
 
     void updateGroupCache() {
         // Update Group Keys
         // this is a quick thing as it only involves reading the config
         // so no need for a job.
 
         // According to Werner Koch groups are more of a hack to solve
         // a valid usecase (e.g. several keys defined for an internal mailing list)
         // that won't make it in the proper keylist interface. And using gpgconf
         // was the suggested way to support groups.
         auto conf = QGpgME::cryptoConfig();
         if (!conf) {
             return;
         }
 
         auto entry = conf->entry(QStringLiteral("gpg"),
                                  QStringLiteral("Configuration"),
                                  QStringLiteral("group"));
         if (!entry) {
             return;
         }
 
         m_groups.clear();
         for (const auto &value: entry->stringValueList()) {
             const auto split = value.split(QLatin1Char('='));
             if (split.size() != 2) {
                 qCDebug (LIBKLEO_LOG) << "Ignoring invalid group config:" << value;
                 continue;
             }
             const auto name = split[0];
             const auto key = q->findByFingerprint(split[1].toLatin1().constData());
             if (key.isNull()) {
                 qCDebug (LIBKLEO_LOG) << "Ignoring unknown fingerprint:" << split[1] << "in group" << name;
                 continue;
             }
             auto vec = m_groups.value(name);
             vec.push_back(key);
             m_groups.insert(name, vec);
         }
     }
 
 private:
     QPointer<RefreshKeysJob> m_refreshJob;
     std::vector<std::shared_ptr<FileSystemWatcher> > m_fsWatchers;
     QTimer m_autoKeyListingTimer;
     int m_refreshInterval;
 
     struct By {
         std::vector<Key> fpr, keyid, shortkeyid, chainid;
         std::vector< std::pair<std::string, Key> > email;
-        std::vector<Subkey> subkeyid;
+        std::vector<Subkey> subkeyid, keygrip;
     } by;
     bool m_initalized;
     bool m_pgpOnly;
     bool m_remarks_enabled;
     QMap <QString, std::vector<Key> > m_groups;
 };
 
 std::shared_ptr<const KeyCache> KeyCache::instance()
 {
     return mutableInstance();
 }
 
 std::shared_ptr<KeyCache> KeyCache::mutableInstance()
 {
     static std::weak_ptr<KeyCache> self;
     try {
         return std::shared_ptr<KeyCache>(self);
     } catch (const std::bad_weak_ptr &) {
         const std::shared_ptr<KeyCache> s(new KeyCache);
         self = s;
         return s;
     }
 }
 
 KeyCache::KeyCache()
     : QObject(), d(new Private(this))
 {
 
 }
 
 KeyCache::~KeyCache() {}
 
 void KeyCache::enableFileSystemWatcher(bool enable)
 {
     for (const auto &i : qAsConst(d->m_fsWatchers)) {
         i->setEnabled(enable);
     }
 }
 
 void KeyCache::setRefreshInterval(int hours)
 {
     d->setRefreshInterval(hours);
 }
 
 int KeyCache::refreshInterval() const
 {
     return d->refreshInterval();
 }
 
 void KeyCache::reload(GpgME::Protocol /*proto*/)
 {
     if (d->m_refreshJob) {
         return;
     }
 
     d->updateAutoKeyListingTimer();
 
     enableFileSystemWatcher(false);
     d->m_refreshJob = new RefreshKeysJob(this);
     connect(d->m_refreshJob.data(), &RefreshKeysJob::done,
             this, [this](const GpgME::KeyListResult &r) {
                 d->refreshJobDone(r);
             });
     d->m_refreshJob->start();
 }
 
 void KeyCache::cancelKeyListing()
 {
     if (!d->m_refreshJob) {
         return;
     }
     d->m_refreshJob->cancel();
 }
 
 void KeyCache::addFileSystemWatcher(const std::shared_ptr<FileSystemWatcher> &watcher)
 {
     if (!watcher) {
         return;
     }
     d->m_fsWatchers.push_back(watcher);
     connect(watcher.get(), &FileSystemWatcher::directoryChanged,
             this, [this]() { startKeyListing(); });
     connect(watcher.get(), &FileSystemWatcher::fileChanged,
             this, [this]() { startKeyListing(); });
 
     watcher->setEnabled(d->m_refreshJob.isNull());
 }
 
 void KeyCache::enableRemarks(bool value)
 {
     if (!d->m_remarks_enabled && value) {
         d->m_remarks_enabled = value;
         if (d->m_initalized && !d->m_refreshJob) {
             qCDebug(LIBKLEO_LOG) << "Reloading keycache with remarks enabled";
             reload();
         } else {
             connect(d->m_refreshJob.data(), &RefreshKeysJob::done,
                     this, [this](const GpgME::KeyListResult &) {
                 qCDebug(LIBKLEO_LOG) << "Reloading keycache with remarks enabled";
                 QTimer::singleShot(1000, this, [this](){ reload(); });
             });
         }
     } else {
         d->m_remarks_enabled = value;
     }
 }
 
 bool KeyCache::remarksEnabled() const
 {
     return d->m_remarks_enabled;
 }
 
 void KeyCache::Private::refreshJobDone(const KeyListResult &result)
 {
     q->enableFileSystemWatcher(true);
     m_initalized = true;
     updateGroupCache();
     Q_EMIT q->keyListingDone(result);
 }
 
 const Key &KeyCache::findByFingerprint(const char *fpr) const
 {
     const std::vector<Key>::const_iterator it = d->find_fpr(fpr);
     if (it == d->by.fpr.end()) {
         static const Key null;
         return null;
     } else {
         return *it;
     }
 }
 
 const Key &KeyCache::findByFingerprint(const std::string &fpr) const
 {
     return findByFingerprint(fpr.c_str());
 }
 
 std::vector<Key> KeyCache::findByEMailAddress(const char *email) const
 {
     const auto pair = d->find_email(email);
     std::vector<Key> result;
     result.reserve(std::distance(pair.first, pair.second));
     std::transform(pair.first, pair.second,
                    std::back_inserter(result),
                    [](const std::pair<std::string, Key> &pair) {
                        return pair.second;
                    });
     return result;
 }
 
 std::vector<Key> KeyCache::findByEMailAddress(const std::string &email) const
 {
     return findByEMailAddress(email.c_str());
 }
 
 const Key &KeyCache::findByShortKeyID(const char *id) const
 {
     const std::vector<Key>::const_iterator it = d->find_shortkeyid(id);
     if (it != d->by.shortkeyid.end()) {
         return *it;
     }
     static const Key null;
     return null;
 }
 
 const Key &KeyCache::findByShortKeyID(const std::string &id) const
 {
     return findByShortKeyID(id.c_str());
 }
 
 const Key &KeyCache::findByKeyIDOrFingerprint(const char *id) const
 {
     {
         // try by.fpr first:
         const std::vector<Key>::const_iterator it = d->find_fpr(id);
         if (it != d->by.fpr.end()) {
             return *it;
         }
     }{
         // try by.keyid next:
         const std::vector<Key>::const_iterator it = d->find_keyid(id);
         if (it != d->by.keyid.end()) {
             return *it;
         }
     }
     static const Key null;
     return null;
 }
 
 const Key &KeyCache::findByKeyIDOrFingerprint(const std::string &id) const
 {
     return findByKeyIDOrFingerprint(id.c_str());
 }
 
 std::vector<Key> KeyCache::findByKeyIDOrFingerprint(const std::vector<std::string> &ids) const
 {
 
     std::vector<std::string> keyids;
     std::remove_copy_if(ids.begin(), ids.end(), std::back_inserter(keyids),
                         [](const std::string &str) {
                             return !str.c_str() || !*str.c_str();
                         });
 
     // this is just case-insensitive string search:
     std::sort(keyids.begin(), keyids.end(), _detail::ByFingerprint<std::less>());
 
     std::vector<Key> result;
     result.reserve(keyids.size());   // dups shouldn't happen
     d->ensureCachePopulated();
 
     kdtools::set_intersection(d->by.fpr.begin(), d->by.fpr.end(),
                               keyids.begin(), keyids.end(),
                               std::back_inserter(result),
                               _detail::ByFingerprint<std::less>());
     if (result.size() < keyids.size()) {
         // note that By{Fingerprint,KeyID,ShortKeyID} define the same
         // order for _strings_
         kdtools::set_intersection(d->by.keyid.begin(), d->by.keyid.end(),
                                   keyids.begin(), keyids.end(),
                                   std::back_inserter(result),
                                   _detail::ByKeyID<std::less>());
     }
     // duplicates shouldn't happen, but make sure nonetheless:
     std::sort(result.begin(), result.end(), _detail::ByFingerprint<std::less>());
     result.erase(std::unique(result.begin(), result.end(), _detail::ByFingerprint<std::equal_to>()), result.end());
 
     // we skip looking into short key ids here, as it's highly
     // unlikely they're used for this purpose. We might need to revise
     // this decision, but only after testing.
     return result;
 }
 
+const Subkey &KeyCache::findSubkeyByKeyGrip(const char *grip) const
+{
+    const std::vector<Subkey>::const_iterator it = d->find_keygrip(grip);
+    if (it == d->by.keygrip.end()) {
+        static const Subkey null;
+        return null;
+    } else {
+        return *it;
+    }
+}
+
+const Subkey &KeyCache::findSubkeyByKeyGrip(const std::string &grip) const
+{
+    return findSubkeyByKeyGrip(grip.c_str());
+}
+
 std::vector<Subkey> KeyCache::findSubkeysByKeyID(const std::vector<std::string> &ids) const
 {
     std::vector<std::string> sorted;
     sorted.reserve(ids.size());
     std::remove_copy_if(ids.begin(), ids.end(), std::back_inserter(sorted),
                         [](const std::string &str) {
                             return !str.c_str() || !*str.c_str();
                         });
 
     std::sort(sorted.begin(), sorted.end(), _detail::ByKeyID<std::less>());
 
     std::vector<Subkey> result;
     d->ensureCachePopulated();
     kdtools::set_intersection(d->by.subkeyid.begin(), d->by.subkeyid.end(),
                               sorted.begin(), sorted.end(),
                               std::back_inserter(result),
                               _detail::ByKeyID<std::less>());
     return result;
 }
 
 std::vector<Key> KeyCache::findRecipients(const DecryptionResult &res) const
 {
     std::vector<std::string> keyids;
     Q_FOREACH (const DecryptionResult::Recipient &r, res.recipients())
         if (const char *kid = r.keyID()) {
             keyids.push_back(kid);
         }
     const std::vector<Subkey> subkeys = findSubkeysByKeyID(keyids);
     std::vector<Key> result;
     result.reserve(subkeys.size());
     std::transform(subkeys.begin(), subkeys.end(), std::back_inserter(result),
                    std::mem_fn(&Subkey::parent));
 
     std::sort(result.begin(), result.end(), _detail::ByFingerprint<std::less>());
     result.erase(std::unique(result.begin(), result.end(), _detail::ByFingerprint<std::equal_to>()), result.end());
     return result;
 }
 
 std::vector<Key> KeyCache::findSigners(const VerificationResult &res) const
 {
     std::vector<std::string> fprs;
     Q_FOREACH (const Signature &s, res.signatures())
         if (const char *fpr = s.fingerprint()) {
             fprs.push_back(fpr);
         }
     return findByKeyIDOrFingerprint(fprs);
 }
 
 std::vector<Key> KeyCache::findSigningKeysByMailbox(const QString &mb) const
 {
     return d->find_mailbox(mb, true);
 }
 
 std::vector<Key> KeyCache::findEncryptionKeysByMailbox(const QString &mb) const
 {
     return d->find_mailbox(mb, false);
 }
 
 namespace
 {
 #define DO( op, meth, meth2 ) if ( op key.meth() ) {} else { qDebug( "rejecting for signing: %s: %s", #meth2, key.primaryFingerprint() ); return false; }
 #define ACCEPT( meth ) DO( !!, meth, !meth )
 #define REJECT( meth ) DO( !, meth, meth )
 struct ready_for_signing : std::unary_function<Key, bool> {
     bool operator()(const Key &key) const
     {
 #if 1
         ACCEPT(hasSecret);
         ACCEPT(canReallySign);
         REJECT(isRevoked);
         REJECT(isExpired);
         REJECT(isDisabled);
         REJECT(isInvalid);
         return true;
 #else
         return key.hasSecret() &&
                key.canReallySign() && !key.isRevoked() && !key.isExpired() && !key.isDisabled() && !key.isInvalid();
 #endif
 #undef DO
     }
 };
 
 struct ready_for_encryption : std::unary_function<Key, bool> {
 #define DO( op, meth, meth2 ) if ( op key.meth() ) {} else { qDebug( "rejecting for encrypting: %s: %s", #meth2, key.primaryFingerprint() ); return false; }
     bool operator()(const Key &key) const
     {
 #if 1
         ACCEPT(canEncrypt);
         REJECT(isRevoked);
         REJECT(isExpired);
         REJECT(isDisabled);
         REJECT(isInvalid);
         return true;
 #else
         return
             key.canEncrypt()    && !key.isRevoked() && !key.isExpired() && !key.isDisabled() && !key.isInvalid();
 #endif
     }
 #undef DO
 #undef ACCEPT
 #undef REJECT
 };
 }
 
 std::vector<Key> KeyCache::Private::find_mailbox(const QString &email, bool sign) const
 {
     if (email.isEmpty()) {
         return std::vector<Key>();
     }
 
     const auto pair = find_email(email.toUtf8().constData());
     std::vector<Key> result;
     result.reserve(std::distance(pair.first, pair.second));
     if (sign)
         kdtools::copy_2nd_if(pair.first, pair.second,
                              std::back_inserter(result),
                              ready_for_signing());
     else
         kdtools::copy_2nd_if(pair.first, pair.second,
                              std::back_inserter(result),
                              ready_for_encryption());
 
     return result;
 }
 
 std::vector<Key> KeyCache::findSubjects(const GpgME::Key &key, Options options) const
 {
     return findSubjects(std::vector<Key>(1, key), options);
 }
 
 std::vector<Key> KeyCache::findSubjects(const std::vector<Key> &keys, Options options) const
 {
     return findSubjects(keys.begin(), keys.end(), options);
 }
 
 std::vector<Key> KeyCache::findSubjects(std::vector<Key>::const_iterator first, std::vector<Key>::const_iterator last, Options options) const
 {
 
     if (first == last) {
         return std::vector<Key>();
     }
 
     std::vector<Key> result;
     while (first != last) {
         const auto pair = d->find_subjects(first->primaryFingerprint());
         result.insert(result.end(), pair.first, pair.second);
         ++first;
     }
 
     std::sort(result.begin(), result.end(), _detail::ByFingerprint<std::less>());
     result.erase(std::unique(result.begin(), result.end(), _detail::ByFingerprint<std::equal_to>()), result.end());
 
     if (options & RecursiveSearch) {
         const std::vector<Key> furtherSubjects = findSubjects(result, options);
         std::vector<Key> combined;
         combined.reserve(result.size() + furtherSubjects.size());
         std::merge(result.begin(), result.end(),
                    furtherSubjects.begin(), furtherSubjects.end(),
                    std::back_inserter(combined),
                    _detail::ByFingerprint<std::less>());
         combined.erase(std::unique(combined.begin(), combined.end(), _detail::ByFingerprint<std::equal_to>()), combined.end());
         result.swap(combined);
     }
 
     return result;
 }
 
 std::vector<Key> KeyCache::findIssuers(const Key &key, Options options) const
 {
 
     if (key.isNull()) {
         return std::vector<Key>();
     }
 
     std::vector<Key> result;
     if (options & IncludeSubject) {
         result.push_back(key);
     }
 
     if (key.isRoot()) {
         return result;
     }
 
     const Key &issuer = findByFingerprint(key.chainID());
 
     if (issuer.isNull()) {
         return result;
     }
 
     result.push_back(issuer);
 
     if (!(options & RecursiveSearch)) {
         return result;
     }
 
     while (!result.back().isNull() && !result.back().isRoot()) {
         result.push_back(findByFingerprint(result.back().chainID()));
     }
 
     if (result.back().isNull()) {
         result.pop_back();
     }
 
     return result;
 }
 
 std::vector<Key> KeyCache::findIssuers(const std::vector<Key> &keys, Options options) const
 {
     return findIssuers(keys.begin(), keys.end(), options);
 }
 
 std::vector<Key> KeyCache::findIssuers(std::vector<Key>::const_iterator first, std::vector<Key>::const_iterator last, Options options) const
 {
 
     if (first == last) {
         return std::vector<Key>();
     }
 
     // extract chain-ids, identifying issuers:
     std::vector<const char *> chainIDs;
     chainIDs.reserve(last - first);
     kdtools::transform_if(first, last, std::back_inserter(chainIDs),
                           std::mem_fn(&Key::chainID),
                           [](const Key &key) { return !key.isRoot(); });
     std::sort(chainIDs.begin(), chainIDs.end(), _detail::ByFingerprint<std::less>());
 
     const auto lastUniqueChainID = std::unique(chainIDs.begin(), chainIDs.end(), _detail::ByFingerprint<std::less>());
 
     std::vector<Key> result;
     result.reserve(lastUniqueChainID - chainIDs.begin());
 
     d->ensureCachePopulated();
 
     kdtools::set_intersection(d->by.fpr.begin(), d->by.fpr.end(),
                               chainIDs.begin(), lastUniqueChainID,
                               std::back_inserter(result),
                               _detail::ByFingerprint<std::less>());
 
     if (options & IncludeSubject) {
         const unsigned int rs = result.size();
         result.insert(result.end(), first, last);
         std::inplace_merge(result.begin(), result.begin() + rs, result.end(),
                            _detail::ByFingerprint<std::less>());
     }
 
     if (!(options & RecursiveSearch)) {
         return result;
     }
 
     const std::vector<Key> l2result = findIssuers(result, options & ~IncludeSubject);
 
     const unsigned long result_size = result.size();
     result.insert(result.end(), l2result.begin(), l2result.end());
     std::inplace_merge(result.begin(), result.begin() + result_size, result.end(),
                        _detail::ByFingerprint<std::less>());
     return result;
 }
 
 static std::string email(const UserID &uid)
 {
     // Prefer the gnupg normalized one
     const std::string addr = uid.addrSpec();
     if (!addr.empty()) {
         return addr;
     }
     const std::string email = uid.email();
     if (email.empty()) {
         return DN(uid.id())[QStringLiteral("EMAIL")].trimmed().toUtf8().constData();
     }
     if (email[0] == '<' && email[email.size() - 1] == '>') {
         return email.substr(1, email.size() - 2);
     } else {
         return email;
     }
 }
 
 static std::vector<std::string> emails(const Key &key)
 {
     std::vector<std::string> emails;
     Q_FOREACH (const UserID &uid, key.userIDs()) {
         const std::string e = email(uid);
         if (!e.empty()) {
             emails.push_back(e);
         }
     }
     std::sort(emails.begin(), emails.end(), ByEMail<std::less>());
     emails.erase(std::unique(emails.begin(), emails.end(), ByEMail<std::equal_to>()), emails.end());
     return emails;
 }
 
 void KeyCache::remove(const Key &key)
 {
     if (key.isNull()) {
         return;
     }
 
     const char *fpr = key.primaryFingerprint();
     if (!fpr) {
         return;
     }
 
     Q_EMIT aboutToRemove(key);
 
     {
         const auto range = std::equal_range(d->by.fpr.begin(), d->by.fpr.end(), fpr,
                                             _detail::ByFingerprint<std::less>());
         d->by.fpr.erase(range.first, range.second);
     }
 
     if (const char *keyid = key.keyID()) {
         const auto range = std::equal_range(d->by.keyid.begin(), d->by.keyid.end(), keyid,
                                             _detail::ByKeyID<std::less>());
         const auto it = std::remove_if(range.first, range.second,
                                        [fpr](const GpgME::Key &key) {
                                            return _detail::ByFingerprint<std::equal_to>()(fpr, key);
                                        });
         d->by.keyid.erase(it, range.second);
     }
 
     if (const char *shortkeyid = key.shortKeyID()) {
         const auto range = std::equal_range(d->by.shortkeyid.begin(), d->by.shortkeyid.end(), shortkeyid,
                                             _detail::ByShortKeyID<std::less>());
         const auto it = std::remove_if(range.first, range.second,
                                        [fpr](const GpgME::Key &key) {
                                            return _detail::ByFingerprint<std::equal_to>()(fpr, key);
                                        });
         d->by.shortkeyid.erase(it, range.second);
     }
 
     if (const char *chainid = key.chainID()) {
         const auto range = std::equal_range(d->by.chainid.begin(), d->by.chainid.end(), chainid,
                                             _detail::ByChainID<std::less>());
         const auto range2 = std::equal_range(range.first, range.second, fpr, _detail::ByFingerprint<std::less>());
         d->by.chainid.erase(range2.first, range2.second);
     }
 
     Q_FOREACH (const std::string &email, emails(key)) {
         const auto range = std::equal_range(d->by.email.begin(), d->by.email.end(), email, ByEMail<std::less>());
         const auto it = std::remove_if(range.first, range.second,
                                        [fpr](const std::pair<std::string, Key> &pair) {
                                            return qstricmp(fpr, pair.second.primaryFingerprint()) == 0;
                                        });
         d->by.email.erase(it, range.second);
     }
 
     Q_FOREACH (const Subkey &subkey, key.subkeys()) {
         if (const char *keyid = subkey.keyID()) {
             const auto range = std::equal_range(d->by.subkeyid.begin(), d->by.subkeyid.end(), keyid,
                                                 _detail::ByKeyID<std::less>());
             const auto it = std::remove_if(range.first, range.second,
                                            [fpr] (const Subkey &subkey) {
                                                return !qstricmp(fpr, subkey.parent().primaryFingerprint());
                                            });
             d->by.subkeyid.erase(it, range.second);
         }
+        if (const char *keygrip = subkey.keyGrip()) {
+            const auto range = std::equal_range(d->by.keygrip.begin(), d->by.keygrip.end(), keygrip,
+                                                _detail::ByKeyGrip<std::less>());
+            const auto it = std::remove_if(range.first, range.second,
+                                           [fpr] (const Subkey &subkey) {
+                                               return !qstricmp(fpr, subkey.parent().primaryFingerprint());
+                                           });
+            d->by.keygrip.erase(it, range.second);
+        }
     }
 }
 
 void KeyCache::remove(const std::vector<Key> &keys)
 {
     for (const Key &key : keys) {
         remove(key);
     }
 }
 
 const std::vector<GpgME::Key> &KeyCache::keys() const
 {
     d->ensureCachePopulated();
     return d->by.fpr;
 }
 
 std::vector<Key> KeyCache::secretKeys() const
 {
     std::vector<Key> keys = this->keys();
     keys.erase(std::remove_if(keys.begin(), keys.end(),
                               [](const Key &key) { return !key.hasSecret(); }),
                keys.end());
     return keys;
 }
 
 void KeyCache::refresh(const std::vector<Key> &keys)
 {
     // make this better...
     clear();
     insert(keys);
 }
 
 void KeyCache::insert(const Key &key)
 {
     insert(std::vector<Key>(1, key));
 }
 
 namespace
 {
 
 template <
     template <template <typename T> class Op> class T1,
     template <template <typename T> class Op> class T2
     > struct lexicographically
 {
     typedef bool result_type;
 
     template <typename U, typename V>
     bool operator()(const U &lhs, const V &rhs) const
     {
         return
             T1<std::less>()(lhs, rhs) ||
             (T1<std::equal_to>()(lhs, rhs) &&
              T2<std::less>()(lhs, rhs))
             ;
     }
 };
 
 }
 
 void KeyCache::insert(const std::vector<Key> &keys)
 {
 
     // 1. remove those with empty fingerprints:
     std::vector<Key> sorted;
     sorted.reserve(keys.size());
     std::remove_copy_if(keys.begin(), keys.end(),
                         std::back_inserter(sorted),
                         [](const Key &key) {
                             auto fp = key.primaryFingerprint();
                             return !fp|| !*fp;
                         });
 
     Q_FOREACH (const Key &key, sorted) {
         remove(key);    // this is sub-optimal, but makes implementation from here on much easier
     }
 
     // 2. sort by fingerprint:
     std::sort(sorted.begin(), sorted.end(), _detail::ByFingerprint<std::less>());
 
     // 2a. insert into fpr index:
     std::vector<Key> by_fpr;
     by_fpr.reserve(sorted.size() + d->by.fpr.size());
     std::merge(sorted.begin(), sorted.end(),
                d->by.fpr.begin(), d->by.fpr.end(),
                std::back_inserter(by_fpr),
                _detail::ByFingerprint<std::less>());
 
     // 3. build email index:
     std::vector< std::pair<std::string, Key> > pairs;
     pairs.reserve(sorted.size());
     Q_FOREACH (const Key &key, sorted) {
         const std::vector<std::string> emails = ::emails(key);
         for (const std::string &e : emails) {
             pairs.push_back(std::make_pair(e, key));
         }
     }
     std::sort(pairs.begin(), pairs.end(), ByEMail<std::less>());
 
     // 3a. insert into email index:
     std::vector< std::pair<std::string, Key> > by_email;
     by_email.reserve(pairs.size() + d->by.email.size());
     std::merge(pairs.begin(), pairs.end(),
                d->by.email.begin(), d->by.email.end(),
                std::back_inserter(by_email),
                ByEMail<std::less>());
 
     // 3.5: stable-sort by chain-id (effectively lexicographically<ByChainID,ByFingerprint>)
     std::stable_sort(sorted.begin(), sorted.end(), _detail::ByChainID<std::less>());
 
     // 3.5a: insert into chain-id index:
     std::vector<Key> nonroot;
     nonroot.reserve(sorted.size());
     std::vector<Key> by_chainid;
     by_chainid.reserve(sorted.size() + d->by.chainid.size());
     std::copy_if(sorted.cbegin(), sorted.cend(),
                  std::back_inserter(nonroot),
                  [](const Key &key) { return !key.isRoot(); });
     std::merge(nonroot.cbegin(), nonroot.cend(),
                d->by.chainid.cbegin(), d->by.chainid.cend(),
                std::back_inserter(by_chainid),
                lexicographically<_detail::ByChainID, _detail::ByFingerprint>());
 
     // 4. sort by key id:
     std::sort(sorted.begin(), sorted.end(), _detail::ByKeyID<std::less>());
 
     // 4a. insert into keyid index:
     std::vector<Key> by_keyid;
     by_keyid.reserve(sorted.size() + d->by.keyid.size());
     std::merge(sorted.begin(), sorted.end(),
                d->by.keyid.begin(), d->by.keyid.end(),
                std::back_inserter(by_keyid),
                _detail::ByKeyID<std::less>());
 
     // 5. sort by short key id:
     std::sort(sorted.begin(), sorted.end(), _detail::ByShortKeyID<std::less>());
 
     // 5a. insert into short keyid index:
     std::vector<Key> by_shortkeyid;
     by_shortkeyid.reserve(sorted.size() + d->by.shortkeyid.size());
     std::merge(sorted.begin(), sorted.end(),
                d->by.shortkeyid.begin(), d->by.shortkeyid.end(),
                std::back_inserter(by_shortkeyid),
                _detail::ByShortKeyID<std::less>());
 
     // 6. build subkey ID index:
     std::vector<Subkey> subkeys;
     subkeys.reserve(sorted.size());
     Q_FOREACH (const Key &key, sorted)
         Q_FOREACH (const Subkey &subkey, key.subkeys()) {
             subkeys.push_back(subkey);
         }
 
     // 6a sort by key id:
     std::sort(subkeys.begin(), subkeys.end(), _detail::ByKeyID<std::less>());
 
     // 6b. insert into subkey ID index:
     std::vector<Subkey> by_subkeyid;
     by_subkeyid.reserve(subkeys.size() + d->by.subkeyid.size());
     std::merge(subkeys.begin(), subkeys.end(),
                d->by.subkeyid.begin(), d->by.subkeyid.end(),
                std::back_inserter(by_subkeyid),
                _detail::ByKeyID<std::less>());
 
+    // 6c. sort by key grip
+    std::sort(subkeys.begin(), subkeys.end(), _detail::ByKeyGrip<std::less>());
+
+    // 6d. insert into subkey keygrip index:
+    std::vector<Subkey> by_keygrip;
+    by_keygrip.reserve(subkeys.size() + d->by.keygrip.size());
+    std::merge(subkeys.begin(), subkeys.end(),
+               d->by.keygrip.begin(), d->by.keygrip.end(),
+               std::back_inserter(by_keygrip),
+               _detail::ByKeyGrip<std::less>());
+
     // now commit (well, we already removed keys...)
     by_fpr.swap(d->by.fpr);
     by_keyid.swap(d->by.keyid);
     by_shortkeyid.swap(d->by.shortkeyid);
     by_email.swap(d->by.email);
     by_subkeyid.swap(d->by.subkeyid);
+    by_keygrip.swap(d->by.keygrip);
     by_chainid.swap(d->by.chainid);
 
     for (const Key &key : qAsConst(sorted)) {
         d->m_pgpOnly &= key.protocol() == GpgME::OpenPGP;
         Q_EMIT added(key);
     }
 
     Q_EMIT keysMayHaveChanged();
 }
 
 void KeyCache::clear()
 {
     d->by = Private::By();
 }
 
 //
 //
 // RefreshKeysJob
 //
 //
 
 class KeyCache::RefreshKeysJob::Private
 {
     RefreshKeysJob *const q;
 public:
     Private(KeyCache *cache, RefreshKeysJob *qq);
     void doStart();
     Error startKeyListing(GpgME::Protocol protocol);
     void listAllKeysJobDone(const KeyListResult &res, const std::vector<Key> &nextKeys)
     {
         std::vector<Key> keys;
         keys.reserve(m_keys.size() + nextKeys.size());
         if (m_keys.empty()) {
             keys = nextKeys;
         } else
             std::merge(m_keys.begin(), m_keys.end(),
                        nextKeys.begin(), nextKeys.end(),
                        std::back_inserter(keys),
                        _detail::ByFingerprint<std::less>());
         m_keys.swap(keys);
         jobDone(res);
     }
     void emitDone(const KeyListResult &result);
     void updateKeyCache();
 
     QPointer<KeyCache> m_cache;
     QVector<QGpgME::ListAllKeysJob*> m_jobsPending;
     std::vector<Key> m_keys;
     KeyListResult m_mergedResult;
     bool m_canceled;
 
 private:
     void jobDone(const KeyListResult &res);
 };
 
 KeyCache::RefreshKeysJob::Private::Private(KeyCache *cache, RefreshKeysJob *qq)
     : q(qq)
     , m_cache(cache)
     , m_canceled(false)
 {
     Q_ASSERT(m_cache);
 }
 
 void KeyCache::RefreshKeysJob::Private::jobDone(const KeyListResult &result)
 {
     if (m_canceled) {
         q->deleteLater();
         return;
     }
 
     QObject *const sender = q->sender();
     if (sender) {
         sender->disconnect(q);
     }
     Q_ASSERT(m_jobsPending.size() > 0);
     m_jobsPending.removeOne(qobject_cast<QGpgME::ListAllKeysJob*>(sender));
     m_mergedResult.mergeWith(result);
     if (m_jobsPending.size() > 0) {
         return;
     }
     updateKeyCache();
     emitDone(m_mergedResult);
 }
 
 void KeyCache::RefreshKeysJob::Private::emitDone(const KeyListResult &res)
 {
     q->deleteLater();
     Q_EMIT q->done(res);
 }
 
 KeyCache::RefreshKeysJob::RefreshKeysJob(KeyCache *cache, QObject *parent) : QObject(parent), d(new Private(cache, this))
 {
 }
 
 KeyCache::RefreshKeysJob::~RefreshKeysJob()
 {
     delete d;
 }
 
 void KeyCache::RefreshKeysJob::start()
 {
     QTimer::singleShot(0, this, [this](){ d->doStart(); });
 }
 
 void KeyCache::RefreshKeysJob::cancel()
 {
     d->m_canceled = true;
     std::for_each(d->m_jobsPending.begin(), d->m_jobsPending.end(),
                   std::mem_fn(&QGpgME::ListAllKeysJob::slotCancel));
     Q_EMIT canceled();
 }
 
 void KeyCache::RefreshKeysJob::Private::doStart()
 {
     if (m_canceled) {
         q->deleteLater();
         return;
     }
 
     Q_ASSERT(m_jobsPending.size() == 0);
     m_mergedResult.mergeWith(KeyListResult(startKeyListing(GpgME::OpenPGP)));
     m_mergedResult.mergeWith(KeyListResult(startKeyListing(GpgME::CMS)));
 
     if (m_jobsPending.size() != 0) {
         return;
     }
 
     const bool hasError = m_mergedResult.error() || m_mergedResult.error().isCanceled();
     emitDone(hasError ? m_mergedResult : KeyListResult(Error(GPG_ERR_UNSUPPORTED_OPERATION)));
 }
 
 void KeyCache::RefreshKeysJob::Private::updateKeyCache()
 {
     if (!m_cache || m_canceled) {
         q->deleteLater();
         return;
     }
 
     std::vector<Key> cachedKeys = m_cache->initialized() ? m_cache->keys() : std::vector<Key>();
     std::sort(cachedKeys.begin(), cachedKeys.end(), _detail::ByFingerprint<std::less>());
     std::vector<Key> keysToRemove;
     std::set_difference(cachedKeys.begin(), cachedKeys.end(),
                         m_keys.begin(), m_keys.end(),
                         std::back_inserter(keysToRemove),
                         _detail::ByFingerprint<std::less>());
     m_cache->remove(keysToRemove);
     m_cache->refresh(m_keys);
 }
 
 Error KeyCache::RefreshKeysJob::Private::startKeyListing(GpgME::Protocol proto)
 {
     const auto * const protocol = (proto == GpgME::OpenPGP) ? QGpgME::openpgp() : QGpgME::smime();
     if (!protocol) {
         return Error();
     }
     QGpgME::ListAllKeysJob *const job = protocol->listAllKeysJob(/*includeSigs*/false, /*validate*/true);
     if (!job) {
         return Error();
     }
 
 #if 0
     aheinecke: 2017.01.12:
 
     For unknown reasons the new style connect fails at runtime
     over library borders into QGpgME from the GpgME repo
     when cross compiled for Windows and default arguments
     are used in the Signal.
 
     This was tested with gcc 4.9 (Mingw 3.0.2) and we could not
     find an explanation for this. So until this is fixed or we understand
     the problem we need to use the old style connect for QGpgME signals.
 
     The new style connect of the canceled signal right below
     works fine.
 
     connect(job, &QGpgME::ListAllKeysJob::result,
             q, [this](const GpgME::KeyListResult &res, const std::vector<GpgME::Key> &keys) {
                 listAllKeysJobDone(res, keys);
             });
 #endif
     connect(job, SIGNAL(result(GpgME::KeyListResult,std::vector<GpgME::Key>)),
             q, SLOT(listAllKeysJobDone(GpgME::KeyListResult,std::vector<GpgME::Key>)));
 
     connect(q, &RefreshKeysJob::canceled, job, &QGpgME::Job::slotCancel);
 
     // Only do this for initialized keycaches to avoid huge waits for
     // signature notations during initial keylisting.
     if (proto == GpgME::OpenPGP && m_cache->remarksEnabled() && m_cache->initialized()) {
         auto ctx = QGpgME::Job::context(job);
         if (ctx) {
             ctx->addKeyListMode(KeyListMode::Signatures |
                                 KeyListMode::SignatureNotations);
         }
     }
 
     const Error error = job->start(true);
 
     if (!error && !error.isCanceled()) {
         m_jobsPending.push_back(job);
     }
     return error;
 }
 
 bool KeyCache::initialized() const
 {
     return d->m_initalized;
 }
 
 void KeyCache::Private::ensureCachePopulated() const
 {
     if (!m_initalized) {
         q->startKeyListing();
         QEventLoop loop;
         loop.connect(q, &KeyCache::keyListingDone,
                      &loop, &QEventLoop::quit);
         qCDebug(LIBKLEO_LOG) << "Waiting for keycache.";
         loop.exec();
         qCDebug(LIBKLEO_LOG) << "Keycache available.";
     }
 }
 
 bool KeyCache::pgpOnly() const
 {
     return d->m_pgpOnly;
 }
 
 static bool keyIsOk(const Key &k)
 {
     return !k.isExpired() && !k.isRevoked() && !k.isInvalid() && !k.isDisabled();
 }
 
 static bool uidIsOk(const UserID &uid)
 {
     return keyIsOk(uid.parent()) && !uid.isRevoked() && !uid.isInvalid();
 }
 
 static bool subkeyIsOk(const Subkey &s)
 {
     return !s.isRevoked() && !s.isInvalid() && !s.isDisabled();
 }
 
 std::vector<GpgME::Key> KeyCache::findBestByMailBox(const char *addr, GpgME::Protocol proto,
                                                     bool needSign, bool needEncrypt) const
 {
     d->ensureCachePopulated();
     std::vector<GpgME::Key> ret;
     if (!addr) {
         return ret;
     }
     if (proto == Protocol::OpenPGP) {
         // Groups take precedence over automatic keys. We return all here
         // so if a group key for example is expired we can show that.
         ret = getGroupKeys(QString::fromUtf8(addr));
         if (!ret.empty()) {
             return ret;
         }
     }
     Key keyC;
     UserID uidC;
     for (const Key &k: findByEMailAddress(addr)) {
         if (proto != Protocol::UnknownProtocol && k.protocol() != proto) {
             continue;
         }
         if (needEncrypt && !k.canEncrypt()) {
             continue;
         }
         if (needSign && (!k.canSign() || !k.hasSecret())) {
             continue;
         }
         /* First get the uid that matches the mailbox */
         for (const UserID &u: k.userIDs()) {
             if (QString::fromStdString(u.addrSpec()).toLower() != QString::fromUtf8(addr).toLower()) {
                 continue;
             }
             if (uidC.isNull()) {
                 keyC = k;
                 uidC = u;
             } else if ((!uidIsOk(uidC) && uidIsOk(u)) || uidC.validity() < u.validity()) {
                 /* Validity of the new key is better. */
                 uidC = u;
                 keyC = k;
             } else if (uidC.validity() == u.validity() && uidIsOk(u)) {
                 /* Both are the same check which one is newer. */
                 time_t oldTime = 0;
                 for (const Subkey &s: keyC.subkeys()) {
                     if (!subkeyIsOk(s)) {
                         continue;
                     }
                     if (needSign && s.canSign()) {
                         oldTime = s.creationTime();
                     } else if (needEncrypt && s.canEncrypt()) {
                         oldTime = s.creationTime();
                     } else if (s.canSign() || s.canEncrypt()) {
                         oldTime = s.creationTime();
                     }
                 }
                 time_t newTime = 0;
                 for (const Subkey &s: k.subkeys()) {
                     if (!subkeyIsOk(s)) {
                         continue;
                     }
                     if (needSign && s.canSign()) {
                         newTime = s.creationTime();
                     } else if (needEncrypt && s.canEncrypt()) {
                         newTime = s.creationTime();
                     } else if (s.canSign() || s.canEncrypt()) {
                         newTime = s.creationTime();
                     }
                 }
                 if (newTime > oldTime) {
                     uidC = u;
                     keyC = k;
                 }
             }
         }
     }
     ret.push_back(keyC);
     return ret;
 }
 
 std::vector<GpgME::Key> KeyCache::getGroupKeys(const QString &groupName) const
 {
     return d->m_groups.value(groupName);
 }
 
 #include "moc_keycache_p.cpp"
 #include "moc_keycache.cpp"
 
diff --git a/src/models/keycache.h b/src/models/keycache.h
index 8fd50d1e0..eeabc3074 100644
--- a/src/models/keycache.h
+++ b/src/models/keycache.h
@@ -1,169 +1,172 @@
 /* -*- mode: c++; c-basic-offset:4 -*-
     models/keycache.h
 
     This file is part of Kleopatra, the KDE keymanager
     SPDX-FileCopyrightText: 2007 Klarälvdalens Datakonsult AB
 
     SPDX-License-Identifier: GPL-2.0-or-later
 */
 
 #ifndef __KLEOPATRA_MODELS_KEYCACHE_H__
 #define __KLEOPATRA_MODELS_KEYCACHE_H__
 
 #include <QObject>
 
 #include <kleo_export.h>
 
 #include <gpgme++/global.h>
 
 #include <memory>
 #include <string>
 #include <vector>
 
 namespace GpgME
 {
 class Key;
 class DecryptionResult;
 class VerificationResult;
 class KeyListResult;
 class Subkey;
 }
 
 namespace KMime
 {
 namespace Types
 {
 class Mailbox;
 }
 }
 
 namespace Kleo
 {
 
 class FileSystemWatcher;
 
 class KLEO_EXPORT KeyCache : public QObject
 {
     Q_OBJECT
 protected:
     explicit KeyCache();
 public:
     static std::shared_ptr<const KeyCache> instance();
     static std::shared_ptr<KeyCache> mutableInstance();
 
     ~KeyCache();
 
     void insert(const GpgME::Key &key);
     void insert(const std::vector<GpgME::Key> &keys);
 
     void refresh(const std::vector<GpgME::Key> &keys);
 
     void remove(const GpgME::Key &key);
     void remove(const std::vector<GpgME::Key> &keys);
 
     void addFileSystemWatcher(const std::shared_ptr<FileSystemWatcher> &watcher);
 
     void enableFileSystemWatcher(bool enable);
 
     void setRefreshInterval(int hours);
     int refreshInterval() const;
 
     void enableRemarks(bool enable);
     bool remarksEnabled() const;
 
     const std::vector<GpgME::Key> &keys() const;
     std::vector<GpgME::Key> secretKeys() const;
 
     const GpgME::Key &findByFingerprint(const char *fpr) const;
     const GpgME::Key &findByFingerprint(const std::string &fpr) const;
 
     std::vector<GpgME::Key> findByEMailAddress(const char *email) const;
     std::vector<GpgME::Key> findByEMailAddress(const std::string &email) const;
 
     /** Look through the cache and search for the best key for a mailbox taking
      * groups into account.
      *
      * The best key is the key with a UID for the provided mailbox that
      * has the highest validity and a subkey that is capable for the given
      * usage.
      * If more then one key have a UID with the same validity
      * the most recently created key is taken.
      *
      * The return value is a list because of groups. A group is
      * a gnupg config entry that allows a user to configure multiple
      * keys for a single mailbox. Only supported for OpenPGP currently.
      *
      * @returns only the "best" key for the mailbox, or a list if it is a group. */
     std::vector<GpgME::Key> findBestByMailBox(const char *addr, GpgME::Protocol proto,
                                               bool needSign, bool needEncrypt) const;
 
     const GpgME::Key &findByShortKeyID(const char *id) const;
     const GpgME::Key &findByShortKeyID(const std::string &id) const;
 
     const GpgME::Key &findByKeyIDOrFingerprint(const char *id) const;
     const GpgME::Key &findByKeyIDOrFingerprint(const std::string &id) const;
 
     std::vector<GpgME::Key> findByKeyIDOrFingerprint(const std::vector<std::string> &ids) const;
 
+    const GpgME::Subkey &findSubkeyByKeyGrip(const char *grip) const;
+    const GpgME::Subkey &findSubkeyByKeyGrip(const std::string &grip) const;
+
     std::vector<GpgME::Subkey> findSubkeysByKeyID(const std::vector<std::string> &ids) const;
 
     std::vector<GpgME::Key> findRecipients(const GpgME::DecryptionResult &result) const;
     std::vector<GpgME::Key> findSigners(const GpgME::VerificationResult &result) const;
 
     std::vector<GpgME::Key> findSigningKeysByMailbox(const QString &mb) const;
     std::vector<GpgME::Key> findEncryptionKeysByMailbox(const QString &mb) const;
 
     /** Check for group keys.
      *
      * @returns A list of keys configured for groupName. Empty if no group cached.*/
     std::vector<GpgME::Key> getGroupKeys(const QString &groupName) const;
 
     enum Option {
         NoOption = 0,
         RecursiveSearch = 1,
         IncludeSubject = 2
     };
     Q_DECLARE_FLAGS(Options, Option)
 
     std::vector<GpgME::Key> findSubjects(const GpgME::Key &key, Options option = RecursiveSearch) const;
     std::vector<GpgME::Key> findSubjects(const std::vector<GpgME::Key> &keys, Options options = RecursiveSearch) const;
     std::vector<GpgME::Key> findSubjects(std::vector<GpgME::Key>::const_iterator first, std::vector<GpgME::Key>::const_iterator last, Options options = RecursiveSearch) const;
 
     std::vector<GpgME::Key> findIssuers(const GpgME::Key &key, Options options = RecursiveSearch) const;
     std::vector<GpgME::Key> findIssuers(const std::vector<GpgME::Key> &keys, Options options = RecursiveSearch) const;
     std::vector<GpgME::Key> findIssuers(std::vector<GpgME::Key>::const_iterator first, std::vector<GpgME::Key>::const_iterator last, Options options = RecursiveSearch) const;
 
     /** Check if at least one keylisting was finished. */
     bool initialized() const;
 
     /** Check if all keys have OpenPGP Protocol. */
     bool pgpOnly() const;
 
 public Q_SLOTS:
     void clear();
     void startKeyListing(GpgME::Protocol proto = GpgME::UnknownProtocol)
     {
         reload(proto);
     }
     void reload(GpgME::Protocol proto = GpgME::UnknownProtocol);
     void cancelKeyListing();
 
 Q_SIGNALS:
     //void changed( const GpgME::Key & key );
     void aboutToRemove(const GpgME::Key &key);
     void added(const GpgME::Key &key);
     void keyListingDone(const GpgME::KeyListResult &result);
     void keysMayHaveChanged();
 
 private:
     class RefreshKeysJob;
 
     class Private;
     QScopedPointer<Private> const d;
 };
 
 }
 
 Q_DECLARE_OPERATORS_FOR_FLAGS(Kleo::KeyCache::Options)
 
 #endif /* __KLEOPATRA_MODELS_KEYCACHE_H__ */