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diff --git a/src/gpg/gpg_context/GpgContextBasicOpera.cpp b/src/gpg/gpg_context/GpgContextBasicOpera.cpp
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+++ b/src/gpg/gpg_context/GpgContextBasicOpera.cpp
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+/**
+ * This file is part of GPGFrontend.
+ *
+ * GPGFrontend 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.
+ *
+ * Foobar 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 Foobar.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ * The initial version of the source code is inherited from gpg4usb-team.
+ * Their source code version also complies with GNU General Public License.
+ *
+ * The source code version of this software was modified and released
+ * by Saturneric<[email protected]> starting on May 12, 2021.
+ *
+ */
+
+#include "gpg/GpgContext.h"
+
+/**
+ * Encrypt data
+ * @param keys keys used
+ * @param inBuffer input byte array
+ * @param outBuffer output byte array
+ * @param result opera result
+ * @return error information
+ */
+gpg_error_t GpgME::GpgContext::encrypt(QVector<GpgKey> &keys, const QByteArray &inBuffer, QByteArray *outBuffer,
+                                       gpgme_encrypt_result_t *result) {
+
+    gpgme_data_t dataIn = nullptr, dataOut = nullptr;
+    outBuffer->resize(0);
+
+    // gpgme_encrypt_result_t e_result;
+    gpgme_key_t recipients[keys.count() + 1];
+
+    int index = 0;
+    for (const auto &key : keys) recipients[index++] = key.key_refer;
+
+    // Last entry dataIn array has to be nullptr
+    recipients[keys.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);
+                }
+            }
+        }
+    }
+    if (dataIn) gpgme_data_release(dataIn);
+    if (dataOut) gpgme_data_release(dataOut);
+
+    if (result != nullptr) *result = gpgme_op_encrypt_result(mCtx);
+    return err;
+}
+
+/**
+ * Decrypt data
+ * @param keys keys used
+ * @param inBuffer input byte array
+ * @param outBuffer output byte array
+ * @param result opera result
+ * @return error information
+ */
+gpgme_error_t GpgME::GpgContext::decrypt(const QByteArray &inBuffer, QByteArray *outBuffer,
+                                         gpgme_decrypt_result_t *result) {
+    gpgme_data_t dataIn = nullptr, dataOut = nullptr;
+    gpgme_decrypt_result_t m_result = nullptr;
+
+    outBuffer->resize(0);
+    if (mCtx != nullptr) {
+        err = gpgme_data_new_from_mem(&dataIn, inBuffer.data(), inBuffer.size(), 1);
+        if (gpgme_err_code(err) == GPG_ERR_NO_ERROR) {
+            err = gpgme_data_new(&dataOut);
+            if (gpgme_err_code(err) == GPG_ERR_NO_ERROR) {
+                err = gpgme_op_decrypt(mCtx, dataIn, dataOut);
+                m_result = gpgme_op_decrypt_result(mCtx);
+                if (gpgme_err_code(err) == GPG_ERR_NO_ERROR) err = readToBuffer(dataOut, outBuffer);
+            }
+        }
+    }
+
+    if (!settings.value("general/rememberPassword").toBool()) clearPasswordCache();
+
+    if (dataIn) gpgme_data_release(dataIn);
+    if (dataOut) gpgme_data_release(dataOut);
+
+    if (result != nullptr) *result = m_result;
+
+    return err;
+}
+
+/**
+ * Verify data
+ * @param keys keys used
+ * @param inBuffer input byte array
+ * @param sigBuffer signature byte array (detected by format)
+ * @param result opera result
+ * @return error information
+ */
+gpgme_error_t GpgME::GpgContext::verify(QByteArray *inBuffer, QByteArray *sigBuffer, gpgme_verify_result_t *result) {
+
+    gpgme_data_t dataIn;
+    gpgme_error_t gpgmeError;
+    gpgme_verify_result_t m_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);
+
+    m_result = gpgme_op_verify_result(mCtx);
+
+    if (result != nullptr) {
+        *result = m_result;
+    }
+
+    return gpgmeError;
+}
+
+/**
+ * Sign data
+ * @param keys keys used
+ * @param inBuffer input byte array
+ * @param outBuffer output byte array
+ * @param mode sign mode
+ * @param result opera result
+ * @return
+ */
+gpg_error_t GpgME::GpgContext::sign(const QVector<GpgKey> &keys, const QByteArray &inBuffer, QByteArray *outBuffer,
+                                    gpgme_sig_mode_t mode, gpgme_sign_result_t *result) {
+
+    gpgme_error_t gpgmeError;
+    gpgme_data_t dataIn, dataOut;
+    gpgme_sign_result_t m_result;
+
+    if (keys.isEmpty()) {
+        QMessageBox::critical(nullptr, tr("Key Selection"), tr("No Private Key Selected"));
+        return false;
+    }
+
+    // Set Singers of this opera
+    setSigners(keys);
+
+    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.
+    */
+
+    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;
+    }
+
+    m_result = gpgme_op_sign_result(mCtx);
+
+    if (result != nullptr) *result = m_result;
+
+    gpgmeError = readToBuffer(dataOut, outBuffer);
+    checkErr(gpgmeError);
+
+    gpgme_data_release(dataIn);
+    gpgme_data_release(dataOut);
+
+    // Of no use yet
+    if (!settings.value("general/rememberPassword").toBool()) clearPasswordCache();
+
+    return gpgmeError;
+}
+
+/**
+ * Encrypt and sign data
+ * @param keys keys used
+ * @param inBuffer input byte array
+ * @param outBuffer output byte array
+ * @param encr_result encrypt opera result
+ * @param sign_result sign opera result
+ * @return
+ */
+gpgme_error_t GpgME::GpgContext::encryptSign(QVector<GpgKey> &keys, const QByteArray &inBuffer, QByteArray *outBuffer,
+                                             gpgme_encrypt_result_t *encr_result, gpgme_sign_result_t *sign_result) {
+    gpgme_data_t data_in = nullptr, data_out = nullptr;
+    outBuffer->resize(0);
+
+    setSigners(keys);
+
+    //gpgme_encrypt_result_t e_result;
+    gpgme_key_t recipients[keys.count() + 1];
+
+    // set key for user
+    int index = 0;
+    for (const auto &key : keys) recipients[index++] = key.key_refer;
+
+    // Last entry dataIn array has to be nullptr
+    recipients[keys.count()] = nullptr;
+
+    // If the last parameter isnt 0, a private copy of data is made
+    if (mCtx != nullptr) {
+        err = gpgme_data_new_from_mem(&data_in, inBuffer.data(), inBuffer.size(), 1);
+        if (gpg_err_code(err) == GPG_ERR_NO_ERROR) {
+            err = gpgme_data_new(&data_out);
+            if (gpg_err_code(err) == GPG_ERR_NO_ERROR) {
+                err = gpgme_op_encrypt_sign(mCtx, recipients, GPGME_ENCRYPT_ALWAYS_TRUST, data_in, data_out);
+                if (encr_result != nullptr)
+                    *encr_result = gpgme_op_encrypt_result(mCtx);
+                if (sign_result != nullptr)
+                    *sign_result = gpgme_op_sign_result(mCtx);
+                if (gpg_err_code(err) == GPG_ERR_NO_ERROR) {
+                    err = readToBuffer(data_out, outBuffer);
+                }
+            }
+        }
+    }
+
+    if (gpgme_err_code(err) != GPG_ERR_NO_ERROR) checkErr(err);
+
+    if (data_in) gpgme_data_release(data_in);
+    if (data_out) gpgme_data_release(data_out);
+
+    return err;
+}
+
+/**
+ * Decrypt and verify data
+ * @param inBuffer input byte array
+ * @param outBuffer output byte array
+ * @param decrypt_result decrypt opera result
+ * @param verify_result verify opera result
+ * @return error info
+ */
+gpgme_error_t GpgME::GpgContext::decryptVerify(const QByteArray &inBuffer, QByteArray *outBuffer,
+                                               gpgme_decrypt_result_t *decrypt_result,
+                                               gpgme_verify_result_t *verify_result) {
+    gpgme_data_t data_in = nullptr, data_out = nullptr;
+
+    outBuffer->resize(0);
+    if (mCtx != nullptr) {
+        err = gpgme_data_new_from_mem(&data_in, inBuffer.data(), inBuffer.size(), 1);
+        if (gpgme_err_code(err) == GPG_ERR_NO_ERROR) {
+            err = gpgme_data_new(&data_out);
+            if (gpgme_err_code(err) == GPG_ERR_NO_ERROR) {
+                err = gpgme_op_decrypt_verify(mCtx, data_in, data_out);
+                if (decrypt_result != nullptr)
+                    *decrypt_result = gpgme_op_decrypt_result(mCtx);
+                if (verify_result != nullptr)
+                    *verify_result = gpgme_op_verify_result(mCtx);
+                if (gpgme_err_code(err) == GPG_ERR_NO_ERROR) {
+                    err = readToBuffer(data_out, outBuffer);
+                }
+            }
+        }
+    }
+
+    if (!settings.value("general/rememberPassword").toBool()) clearPasswordCache();
+
+    if (data_in) gpgme_data_release(data_in);
+    if (data_out) gpgme_data_release(data_out);
+
+    return err;
+}