File Structure Modified.

Change Headers and Source Files Name.
Modified CMake Structure.

1 files changed, 818 insertions, 0 deletions

diff --git a/src/gpg/GpgContext.cpp b/src/gpg/GpgContext.cpp
new file mode 100644
index 00000000..d0694638
--- /dev/null
+++ b/src/gpg/GpgContext.cpp
@@ -0,0 +1,818 @@
+/*
+ *      gpgcontext.cpp
+ *
+ *      Copyright 2008 gpg4usb-team <[email protected]>
+ *
+ *      This file is part of gpg4usb.
+ *
+ *      Gpg4usb is free software: you can redistribute it and/or modify
+ *      it under the terms of the GNU General Public License as published by
+ *      the Free Software Foundation, either version 3 of the License, or
+ *      (at your option) any later version.
+ *
+ *      Gpg4usb is distributed in the hope that it will be useful,
+ *      but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *      GNU General Public License for more details.
+ *
+ *      You should have received a copy of the GNU General Public License
+ *      along with gpg4usb.  If not, see <http://www.gnu.org/licenses/>
+ */
+
+#include "gpg/GpgContext.h"
+#include <unistd.h>    /* contains read/write */
+
+#ifdef _WIN32
+#include <windows.h>
+#endif
+namespace GpgME {
+
+/** Constructor
+ *  Set up gpgme-context, set paths to app-run path
+ */
+    GpgContext::GpgContext() {
+        /** get application path */
+        QString appPath = qApp->applicationDirPath();
+
+        /** The function `gpgme_check_version' must be called before any other
+         *  function in the library, because it initializes the thread support
+         *  subsystem in GPGME. (from the info page) */
+        gpgme_check_version(nullptr);
+
+        // TODO: Set gpgme_language to config
+        /*QSettings qSettings;
+        qDebug() << " - " << qSettings.value("int/lang").toLocale().name();
+        qDebug() << " - " << QLocale(qSettings.value("int/lang").toString()).name();*/
+
+        // the locale set here is used for the other setlocale calls which have nullptr
+        // -> nullptr means use default, which is configured here
+        setlocale(LC_ALL, "");
+
+        /** set locale, because tests do also */
+        gpgme_set_locale(nullptr, LC_CTYPE, setlocale(LC_CTYPE, nullptr));
+        //qDebug() << "Locale set to" << LC_CTYPE << " - " << setlocale(LC_CTYPE, nullptr);
+#ifndef _WIN32
+        gpgme_set_locale(nullptr, LC_MESSAGES, setlocale(LC_MESSAGES, nullptr));
+#endif
+
+        err = gpgme_new(&mCtx);
+
+        checkErr(err);
+        /** here come the qSettings, instead of /usr/bin/gpg
+         * a executable in the same path as app is used.
+         * also lin/win must  be checked, for calling gpg.exe if needed
+         */
+#ifdef _WIN32
+        gpgBin = appPath + "/bin/gpg.exe";
+#else
+        gpgBin = appPath + "/bin/gpg";
+#endif
+
+        QSettings qSettings;
+        QString accKeydbPath = qSettings.value("gpgpaths/keydbpath").toString();
+        QString qGpgKeys = appPath + "/keydb/" + accKeydbPath;
+
+        if (accKeydbPath != "") {
+            if (!QDir(qGpgKeys).exists()) {
+                QMessageBox::critical(0, tr("keydb path"),
+                                      tr("Didn't find keydb directory. Switching to gpg4usb's default keydb directory for this session."));
+                qGpgKeys = appPath + "/keydb";
+            }
+        }
+
+        /*    err = gpgme_ctx_set_engine_info(mCtx, GPGME_PROTOCOL_OpenPGP,
+                                            gpgBin.toUtf8().constData(),
+                                            qGpgKeys.toUtf8().constData());*/
+#ifndef GPG4USB_NON_PORTABLE
+        err = gpgme_ctx_set_engine_info(mCtx, GPGME_PROTOCOL_OpenPGP,
+                                        gpgBin.toLocal8Bit().constData(),
+                                        qGpgKeys.toLocal8Bit().constData());
+        checkErr(err);
+#endif
+
+        gpgme_engine_info_t engineInfo;
+        engineInfo = gpgme_ctx_get_engine_info(mCtx);
+
+
+        while (engineInfo != nullptr) {
+            qDebug() << gpgme_get_protocol_name(engineInfo->protocol);
+            engineInfo = engineInfo->next;
+        }
+
+        /** Setting the output type must be done at the beginning */
+        /** think this means ascii-armor --> ? */
+        gpgme_set_armor(mCtx, 1);
+        /** passphrase-callback */
+        gpgme_set_passphrase_cb(mCtx, passphraseCb, this);
+
+        /** check if app is called with -d from command line */
+        if (qApp->arguments().contains("-d")) {
+            qDebug() << "gpgme_data_t debug on";
+            debug = true;
+        } else {
+            debug = false;
+        }
+
+        connect(this, SIGNAL(signalKeyDBChanged()), this, SLOT(slotRefreshKeyList()));
+        slotRefreshKeyList();
+    }
+
+/** Destructor
+ *  Release gpgme-context
+ */
+    GpgContext::~GpgContext() {
+        if (mCtx) gpgme_release(mCtx);
+        mCtx = 0;
+    }
+
+/** Import Key from QByteArray
+ *
+ */
+    GpgImportInformation GpgContext::importKey(QByteArray inBuffer) {
+        auto *importInformation = new GpgImportInformation();
+        err = gpgme_data_new_from_mem(&in, inBuffer.data(), inBuffer.size(), 1);
+        checkErr(err);
+        err = gpgme_op_import(mCtx, in);
+        gpgme_import_result_t result;
+
+        result = gpgme_op_import_result(mCtx);
+        if (result->unchanged) {
+            importInformation->unchanged = result->unchanged;
+        }
+        if (result->considered) {
+            importInformation->considered = result->considered;
+        }
+        if (result->no_user_id) {
+            importInformation->no_user_id = result->no_user_id;
+        }
+        if (result->imported) {
+            importInformation->imported = result->imported;
+        }
+        if (result->imported_rsa) {
+            importInformation->imported_rsa = result->imported_rsa;
+        }
+        if (result->unchanged) {
+            importInformation->unchanged = result->unchanged;
+        }
+        if (result->new_user_ids) {
+            importInformation->new_user_ids = result->new_user_ids;
+        }
+        if (result->new_sub_keys) {
+            importInformation->new_sub_keys = result->new_sub_keys;
+        }
+        if (result->new_signatures) {
+            importInformation->new_signatures = result->new_signatures;
+        }
+        if (result->new_revocations) {
+            importInformation->new_revocations = result->new_revocations;
+        }
+        if (result->secret_read) {
+            importInformation->secret_read = result->secret_read;
+        }
+        if (result->secret_imported) {
+            importInformation->secret_imported = result->secret_imported;
+        }
+        if (result->secret_unchanged) {
+            importInformation->secret_unchanged = result->secret_unchanged;
+        }
+        if (result->not_imported) {
+            importInformation->not_imported = result->not_imported;
+        }
+        gpgme_import_status_t status = result->imports;
+        while (status != nullptr) {
+            GpgImportedKey key;
+            key.importStatus = static_cast<int>(status->status);
+            key.fpr = status->fpr;
+            importInformation->importedKeys.append(key);
+            status = status->next;
+        }
+        checkErr(err);
+        emit signalKeyDBChanged();
+        gpgme_data_release(in);
+        return *importInformation;
+    }
+
+/** Generate New Key with values params
+ *
+ */
+    void GpgContext::generateKey(QString *params) {
+        err = gpgme_op_genkey(mCtx, params->toUtf8().data(), nullptr, nullptr);
+        checkErr(err);
+        emit signalKeyDBChanged();
+    }
+
+/** Export Key to QByteArray
+ *
+ */
+    bool GpgContext::exportKeys(QStringList *uidList, QByteArray *outBuffer) {
+        size_t read_bytes;
+        gpgme_data_t dataOut = nullptr;
+        outBuffer->resize(0);
+
+        if (uidList->count() == 0) {
+            QMessageBox::critical(nullptr, "Export Keys Error", "No Keys Selected");
+            return false;
+        }
+
+        for (int i = 0; i < uidList->count(); i++) {
+            err = gpgme_data_new(&dataOut);
+            checkErr(err);
+
+            err = gpgme_op_export(mCtx, uidList->at(i).toUtf8().constData(), 0, dataOut);
+            checkErr(err);
+
+            read_bytes = gpgme_data_seek(dataOut, 0, SEEK_END);
+
+            err = readToBuffer(dataOut, outBuffer);
+            checkErr(err);
+            gpgme_data_release(dataOut);
+        }
+        return true;
+    }
+
+    gpgme_key_t GpgContext::getKeyDetails(const QString& uid) {
+        gpgme_key_t key;
+
+        // try secret
+        gpgme_get_key(mCtx, uid.toUtf8().constData(), &key, 1);
+        // ok, its a public key
+        if (!key) {
+            gpgme_get_key(mCtx, uid.toUtf8().constData(), &key, 0);
+        }
+        return key;
+    }
+
+/** List all availabe Keys (VERY much like kgpgme)
+ */
+    GpgKeyList GpgContext::listKeys() {
+        gpgme_error_t gpgmeError;
+        gpgme_key_t key;
+
+        GpgKeyList keys;
+        //TODO dont run the loop more often than necessary
+        // list all keys ( the 0 is for all )
+        gpgmeError = gpgme_op_keylist_start(mCtx, nullptr, 0);
+        checkErr(gpgmeError);
+        while (!(gpgmeError = gpgme_op_keylist_next(mCtx, &key))) {
+            GpgKey gpgkey;
+
+            if (!key->subkeys)
+                continue;
+
+            gpgkey.id = key->subkeys->keyid;
+            gpgkey.fpr = key->subkeys->fpr;
+            gpgkey.expired = (key->expired != 0u);
+            gpgkey.revoked = (key->revoked != 0u);
+
+            if (key->uids) {
+                gpgkey.name = QString::fromUtf8(key->uids->name);
+                gpgkey.email = QString::fromUtf8(key->uids->email);
+            }
+            keys.append(gpgkey);
+            gpgme_key_unref(key);
+        }
+        gpgme_op_keylist_end(mCtx);
+
+        // list only private keys ( the 1 does )
+        gpgme_op_keylist_start(mCtx, nullptr, 1);
+        while (!(gpgmeError = gpgme_op_keylist_next(mCtx, &key))) {
+            if (!key->subkeys)
+                continue;
+            // iterate keys, mark privates
+            GpgKeyList::iterator it = keys.begin();
+            while (it != keys.end()) {
+                if (key->subkeys->keyid == it->id.toStdString())
+                    it->privkey = true;
+                it++;
+            }
+
+            gpgme_key_unref(key);
+        }
+        gpgme_op_keylist_end(mCtx);
+
+        return keys;
+    }
+
+/** Delete keys
+ */
+
+    void GpgContext::deleteKeys(QStringList *uidList) {
+        QString tmp;
+        gpgme_key_t key;
+
+                foreach(tmp, *uidList) {
+                gpgme_op_keylist_start(mCtx, tmp.toUtf8().constData(), 0);
+                gpgme_op_keylist_next(mCtx, &key);
+                gpgme_op_keylist_end(mCtx);
+                gpgme_op_delete(mCtx, key, 1);
+            }
+        emit signalKeyDBChanged();
+    }
+
+/** Encrypt inBuffer for reciepients-uids, write
+ *  result to outBuffer
+ */
+    bool GpgContext::encrypt(QStringList *uidList, const QByteArray &inBuffer, QByteArray *outBuffer) {
+
+        gpgme_data_t dataIn = nullptr, dataOut = nullptr;
+        outBuffer->resize(0);
+
+        if (uidList->count() == 0) {
+            QMessageBox::critical(nullptr, tr("No Key Selected"), tr("No Key Selected"));
+            return false;
+        }
+
+        //gpgme_encrypt_result_t e_result;
+        gpgme_key_t recipients[uidList->count() + 1];
+
+        /* get key for user */
+        for (int i = 0; i < uidList->count(); i++) {
+            // the last 0 is for public keys, 1 would return private keys
+            gpgme_op_keylist_start(mCtx, uidList->at(i).toUtf8().constData(), 0);
+            gpgme_op_keylist_next(mCtx, &recipients[i]);
+            gpgme_op_keylist_end(mCtx);
+        }
+        //Last entry dataIn array has to be nullptr
+        recipients[uidList->count()] = nullptr;
+
+        //If the last parameter isnt 0, a private copy of data is made
+        if (mCtx) {
+            err = gpgme_data_new_from_mem(&dataIn, inBuffer.data(), inBuffer.size(), 1);
+            checkErr(err);
+            if (!err) {
+                err = gpgme_data_new(&dataOut);
+                checkErr(err);
+                if (!err) {
+                    err = gpgme_op_encrypt(mCtx, recipients, GPGME_ENCRYPT_ALWAYS_TRUST, dataIn, dataOut);
+                    checkErr(err);
+                    if (!err) {
+                        err = readToBuffer(dataOut, outBuffer);
+                        checkErr(err);
+                    }
+                }
+            }
+        }
+        /* unref all keys */
+        for (int i = 0; i <= uidList->count(); i++) {
+            gpgme_key_unref(recipients[i]);
+        }
+        if (dataIn) {
+            gpgme_data_release(dataIn);
+        }
+        if (dataOut) {
+            gpgme_data_release(dataOut);
+        }
+        return (err == GPG_ERR_NO_ERROR);
+    }
+
+/** Decrypt QByteAarray, return QByteArray
+ *  mainly from http://basket.kde.org/ (kgpgme.cpp)
+ */
+    bool GpgContext::decrypt(const QByteArray &inBuffer, QByteArray *outBuffer) {
+        gpgme_data_t dataIn = nullptr, dataOut = nullptr;
+        gpgme_decrypt_result_t result = nullptr;
+        QString errorString;
+
+        outBuffer->resize(0);
+        if (mCtx) {
+            err = gpgme_data_new_from_mem(&dataIn, inBuffer.data(), inBuffer.size(), 1);
+            checkErr(err);
+            if (!err) {
+                err = gpgme_data_new(&dataOut);
+                checkErr(err);
+                if (!err) {
+                    err = gpgme_op_decrypt(mCtx, dataIn, dataOut);
+                    checkErr(err);
+
+                    if (gpg_err_code(err) == GPG_ERR_DECRYPT_FAILED) {
+                        errorString.append(gpgErrString(err)).append("<br>");
+                        result = gpgme_op_decrypt_result(mCtx);
+                        checkErr(result->recipients->status);
+                        errorString.append(gpgErrString(result->recipients->status)).append("<br>");
+                        errorString.append(
+                                tr("<br>No private key with id %1 present dataIn keyring").arg(result->recipients->keyid));
+                    } else {
+                        errorString.append(gpgErrString(err)).append("<br>");
+                    }
+
+                    if (!err) {
+                        result = gpgme_op_decrypt_result(mCtx);
+                        if (result->unsupported_algorithm) {
+                            QMessageBox::critical(0, tr("Unsupported algorithm"), result->unsupported_algorithm);
+                        } else {
+                            err = readToBuffer(dataOut, outBuffer);
+                            checkErr(err);
+                        }
+                    }
+                }
+            }
+        }
+        if (gpg_err_code(err) != GPG_ERR_NO_ERROR && gpg_err_code(err) != GPG_ERR_CANCELED) {
+            QMessageBox::critical(nullptr, tr("Error decrypting:"), errorString);
+            return false;
+        }
+
+        if (!settings.value("general/rememberPassword").toBool()) {
+            clearPasswordCache();
+        }
+
+        if (dataIn) {
+            gpgme_data_release(dataIn);
+        }
+        if (dataOut) {
+            gpgme_data_release(dataOut);
+        }
+        return (err == GPG_ERR_NO_ERROR);
+    }
+
+/**  Read gpgme-Data to QByteArray
+ *   mainly from http://basket.kde.org/ (kgpgme.cpp)
+ */
+#define BUF_SIZE (32 * 1024)
+
+    gpgme_error_t GpgContext::readToBuffer(gpgme_data_t dataIn, QByteArray *outBuffer) {
+        off_t ret;
+        gpgme_error_t gpgErrNoError = GPG_ERR_NO_ERROR;
+
+        ret = gpgme_data_seek(dataIn, 0, SEEK_SET);
+        if (ret) {
+            gpgErrNoError = gpgme_err_code_from_errno(errno);
+            checkErr(gpgErrNoError, "failed dataseek dataIn readToBuffer");
+        } else {
+            char buf[BUF_SIZE + 2];
+
+            while ((ret = gpgme_data_read(dataIn, buf, BUF_SIZE)) > 0) {
+                const size_t size = outBuffer->size();
+                outBuffer->resize(static_cast<int>(size + ret));
+                memcpy(outBuffer->data() + size, buf, ret);
+            }
+            if (ret < 0) {
+                gpgErrNoError = gpgme_err_code_from_errno(errno);
+                checkErr(gpgErrNoError, "failed data_read dataIn readToBuffer");
+            }
+        }
+        return gpgErrNoError;
+    }
+
+/** The Passphrase window, if not provided by env-Var GPG_AGENT_INFO
+ *  originally copied from http://basket.kde.org/ (kgpgme.cpp), but modified
+ */
+    gpgme_error_t GpgContext::passphraseCb(void *hook, const char *uid_hint,
+                                           const char *passphrase_info,
+                                           int last_was_bad, int fd) {
+        auto *gpg = static_cast<GpgContext *>(hook);
+        return gpg->passphrase(uid_hint, passphrase_info, last_was_bad, fd);
+    }
+
+    gpgme_error_t GpgContext::passphrase(const char *uid_hint,
+                                         const char * /*passphrase_info*/,
+                                         int last_was_bad, int fd) {
+        gpgme_error_t returnValue = GPG_ERR_CANCELED;
+        QString passwordDialogMessage;
+        QString gpgHint = QString::fromUtf8(uid_hint);
+        bool result;
+#ifdef _WIN32
+        DWORD written;
+        HANDLE hd = (HANDLE)fd;
+#endif
+
+        if (last_was_bad) {
+            passwordDialogMessage += "<i>" + tr("Wrong password") + ".</i><br><br>\n\n";
+            clearPasswordCache();
+        }
+
+        /** if uid provided */
+        if (!gpgHint.isEmpty()) {
+            // remove UID, leave only username & email
+            gpgHint.remove(0, gpgHint.indexOf(" "));
+            passwordDialogMessage += "<b>" + tr("Enter Password for") + "</b><br>" + gpgHint + "<br>";
+        }
+
+        if (mPasswordCache.isEmpty()) {
+            QString password = QInputDialog::getText(QApplication::activeWindow(), tr("Enter Password"),
+                                                     passwordDialogMessage, QLineEdit::Password,
+                                                     "", &result);
+
+            if (result) mPasswordCache = password.toUtf8();
+        } else {
+            result = true;
+        }
+
+        if (result) {
+
+#ifndef _WIN32
+            if (write(fd, mPasswordCache.data(), mPasswordCache.length()) == -1) {
+                qDebug() << "something is terribly broken";
+            }
+#else
+            WriteFile(hd, mPasswordCache.data(), mPasswordCache.length(), &written, 0);
+#endif
+
+            returnValue = GPG_ERR_NO_ERROR;
+        }
+
+#ifndef _WIN32
+        if (write(fd, "\n", 1) == -1) {
+            qDebug() << "something is terribly broken";
+        }
+#else
+        WriteFile(hd, "\n", 1, &written, 0);
+
+        /* program will hang on cancel if hd not closed */
+        if(!result) {
+                CloseHandle(hd);
+        }
+#endif
+
+        return returnValue;
+    }
+
+/** also from kgpgme.cpp, seems to clear password from mem */
+    void GpgContext::clearPasswordCache() {
+        if (mPasswordCache.size() > 0) {
+            mPasswordCache.fill('\0');
+            mPasswordCache.truncate(0);
+        }
+    }
+
+// error-handling
+    void GpgContext::checkErr(gpgme_error_t gpgmeError, const QString& comment) {
+        //if (gpgmeError != GPG_ERR_NO_ERROR && gpgmeError != GPG_ERR_CANCELED) {
+        if (gpgmeError != GPG_ERR_NO_ERROR) {
+            qDebug() << "[Error " << comment << "] Source: " << gpgme_strsource(gpgmeError) << " String: "
+                     << gpgErrString(gpgmeError);
+        }
+    }
+
+    void GpgContext::checkErr(gpgme_error_t gpgmeError) {
+        //if (gpgmeError != GPG_ERR_NO_ERROR && gpgmeError != GPG_ERR_CANCELED) {
+        if (gpgmeError != GPG_ERR_NO_ERROR) {
+            qDebug() << "[Error] Source: " << gpgme_strsource(gpgmeError) << " String: " << gpgErrString(gpgmeError);
+        }
+    }
+
+    QString GpgContext::gpgErrString(gpgme_error_t err) {
+        return QString::fromUtf8(gpgme_strerror(err));
+    }
+
+/** export private key, TODO errohandling, e.g. like in seahorse (seahorse-gpg-op.c) **/
+
+    void GpgContext::exportSecretKey(const QString& uid, QByteArray *outBuffer) {
+        qDebug() << *outBuffer;
+        // export private key to outBuffer
+        QStringList arguments;
+        arguments << "--armor" << "--export-secret-key" << uid;
+        auto *p_errArray = new QByteArray();
+        executeGpgCommand(arguments, outBuffer, p_errArray);
+
+        // append public key to outBuffer
+        auto *pubKey = new QByteArray();
+        QStringList keyList;
+        keyList.append(uid);
+        exportKeys(&keyList, pubKey);
+        outBuffer->append(*pubKey);
+    }
+
+/** return type should be gpgme_error_t*/
+    void GpgContext::executeGpgCommand(const QStringList& arguments, QByteArray *stdOut, QByteArray *stdErr) {
+        QStringList args;
+        args << "--homedir" << gpgKeys << "--batch" << arguments;
+
+        qDebug() << args;
+        QProcess gpg;
+        //  qDebug() << "engine->file_name" << engine->file_name;
+
+        gpg.start(gpgBin, args);
+        gpg.waitForFinished();
+
+        *stdOut = gpg.readAllStandardOutput();
+        *stdErr = gpg.readAllStandardError();
+        qDebug() << *stdOut;
+    }
+
+/***
+  * if sigbuffer not set, the inbuffer should contain signed text
+  *
+  * TODO: return type should contain:
+  * -> list of sigs
+  * -> valid
+  * -> errors
+  */
+    gpgme_signature_t GpgContext::verify(QByteArray *inBuffer, QByteArray *sigBuffer) {
+
+        gpgme_data_t dataIn;
+        gpgme_error_t gpgmeError;
+        gpgme_signature_t sign;
+        gpgme_verify_result_t result;
+
+        gpgmeError = gpgme_data_new_from_mem(&dataIn, inBuffer->data(), inBuffer->size(), 1);
+        checkErr(gpgmeError);
+
+        if (sigBuffer != nullptr) {
+            gpgme_data_t sigdata;
+            gpgmeError = gpgme_data_new_from_mem(&sigdata, sigBuffer->data(), sigBuffer->size(), 1);
+            checkErr(gpgmeError);
+            gpgmeError = gpgme_op_verify(mCtx, sigdata, dataIn, nullptr);
+        } else {
+            gpgmeError = gpgme_op_verify(mCtx, dataIn, nullptr, dataIn);
+        }
+
+        checkErr(gpgmeError);
+
+        if (gpgmeError != 0) {
+            return nullptr;
+        }
+
+        result = gpgme_op_verify_result(mCtx);
+        sign = result->signatures;
+        return sign;
+    }
+
+    /***
+      * return type should contain:
+      * -> list of sigs
+      * -> valid
+      * -> decrypted message
+      */
+    //void GpgContext::decryptVerify(QByteArray in) {
+
+    /*    gpgme_error_t err;
+        gpgme_data_t in, out;
+
+        gpgme_decrypt_result_t decrypt_result;
+        gpgme_verify_result_t verify_result;
+
+        err = gpgme_op_decrypt_verify (mCtx, in, out);
+        decrypt_result = gpgme_op_decrypt_result (mCtx);
+
+        verify_result = gpgme_op_verify_result (mCtx);
+     */
+    //}
+    bool GpgContext::sign(QStringList *uidList, const QByteArray &inBuffer, QByteArray *outBuffer, bool detached) {
+
+        gpgme_error_t gpgmeError;
+        gpgme_data_t dataIn, dataOut;
+        gpgme_sign_result_t result;
+        gpgme_sig_mode_t mode;
+
+        if (uidList->count() == 0) {
+            QMessageBox::critical(nullptr, tr("Key Selection"), tr("No Private Key Selected"));
+            return false;
+        }
+
+        // at start or end?
+        gpgme_signers_clear(mCtx);
+
+        //gpgme_encrypt_result_t e_result;
+        gpgme_key_t signers[uidList->count() + 1];
+
+
+        // TODO: do we really need array? adding one key dataIn loop should be ok
+        for (int i = 0; i < uidList->count(); i++) {
+            // the last 0 is for public keys, 1 would return private keys
+            gpgme_op_keylist_start(mCtx, uidList->at(i).toUtf8().constData(), 0);
+            gpgme_op_keylist_next(mCtx, &signers[i]);
+            gpgme_op_keylist_end(mCtx);
+
+            gpgmeError = gpgme_signers_add(mCtx, signers[i]);
+            checkErr(gpgmeError);
+        }
+
+        gpgmeError = gpgme_data_new_from_mem(&dataIn, inBuffer.data(), inBuffer.size(), 1);
+        checkErr(gpgmeError);
+        gpgmeError = gpgme_data_new(&dataOut);
+        checkErr(gpgmeError);
+
+        /*
+            `GPGME_SIG_MODE_NORMAL'
+                  A normal signature is made, the output includes the plaintext
+                  and the signature.
+
+            `GPGME_SIG_MODE_DETACH'
+                  A detached signature is made.
+
+            `GPGME_SIG_MODE_CLEAR'
+                  A clear text signature is made.  The ASCII armor and text
+                  mode settings of the context are ignored.
+        */
+
+        if (detached) {
+            mode = GPGME_SIG_MODE_DETACH;
+        } else {
+            mode = GPGME_SIG_MODE_CLEAR;
+        }
+
+        gpgmeError = gpgme_op_sign(mCtx, dataIn, dataOut, mode);
+        checkErr(gpgmeError);
+
+        if (gpgmeError == GPG_ERR_CANCELED) {
+            return false;
+        }
+
+        if (gpgmeError != GPG_ERR_NO_ERROR) {
+            QMessageBox::critical(nullptr, tr("Error in signing:"), QString::fromUtf8(gpgme_strerror(gpgmeError)));
+            return false;
+        }
+
+        result = gpgme_op_sign_result(mCtx);
+
+        // TODO Handle the result
+
+        gpgmeError = readToBuffer(dataOut, outBuffer);
+        checkErr(gpgmeError);
+
+        gpgme_data_release(dataIn);
+        gpgme_data_release(dataOut);
+
+        if (!settings.value("general/rememberPassword").toBool()) {
+            clearPasswordCache();
+        }
+
+        return (gpgmeError == GPG_ERR_NO_ERROR);
+    }
+
+/*
+ * if there is no '\n' before the PGP-Begin-Block, but for example a whitespace,
+ * GPGME doesn't recognise the Message as encrypted. This function adds '\n'
+ * before the PGP-Begin-Block, if missing.
+ */
+    void GpgContext::preventNoDataErr(QByteArray *in) {
+        int block_start = in->indexOf(GpgConstants::PGP_CRYPT_BEGIN);
+        if (block_start > 0 && in->at(block_start - 1) != '\n') {
+            in->insert(block_start, '\n');
+        }
+        block_start = in->indexOf(GpgConstants::PGP_SIGNED_BEGIN);
+        if (block_start > 0 && in->at(block_start - 1) != '\n') {
+            in->insert(block_start, '\n');
+        }
+    }
+
+/*
+  * isSigned returns:
+  * - 0, if text isn't signed at all
+  * - 1, if text is partially signed
+  * - 2, if text is completly signed
+  */
+    int GpgContext::textIsSigned(const QByteArray &text) {
+        if (text.trimmed().startsWith(GpgConstants::PGP_SIGNED_BEGIN) &&
+            text.trimmed().endsWith(GpgConstants::PGP_SIGNED_END)) {
+            return 2;
+        }
+        if (text.contains(GpgConstants::PGP_SIGNED_BEGIN) && text.contains(GpgConstants::PGP_SIGNED_END)) {
+            return 1;
+        }
+        return 0;
+    }
+
+    QString GpgContext::beautifyFingerprint(QString fingerprint) {
+        uint len = fingerprint.length();
+        if ((len > 0) && (len % 4 == 0))
+            for (uint n = 0; 4 * (n + 1) < len; ++n)
+                fingerprint.insert(static_cast<int>(5u * n + 4u), ' ');
+        return fingerprint;
+    }
+
+    void GpgContext::slotRefreshKeyList() {
+        mKeyList = this->listKeys();
+    }
+
+/**
+ * note: privkey status is not returned
+ */
+    GpgKey GpgContext::getKeyByFpr(const QString& fpr) {
+
+        //GpgKeyList list = this->listKeys();
+                foreach  (GpgKey key, mKeyList) {
+                if (key.fpr == fpr) {
+                    return key;
+                }
+            }
+
+        return GpgKey();
+    }
+
+/**
+ * note: privkey status is not returned
+ */
+    GpgKey GpgContext::getKeyById(const QString& id) {
+
+        //GpgKeyList list = this->listKeys();
+                foreach  (GpgKey key, mKeyList) {
+                if (key.id == id) {
+                    return key;
+                }
+            }
+
+        return GpgKey();
+    }
+
+    QString GpgContext::getGpgmeVersion() {
+        return QString(gpgme_check_version(nullptr));
+    }
+
+}
+
+
+
+
+