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Added AES encryption/decryption ability (version 1)
-AesInterface is a Qt interface for AES encryption/decryption that uses AES 256 CBC mode.
This commit is contained in:
S. Razi Alavizadeh
parent
50a4d78026
commit
6342884e86
@ -243,7 +243,9 @@ SOURCES += \
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tools/delayedfilewatcher.cpp \
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autofill/passwordmanager.cpp \
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autofill/passwordbackends/databasepasswordbackend.cpp \
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autofill/passwordbackends/passwordbackend.cpp
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autofill/passwordbackends/passwordbackend.cpp \
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tools/aesinterface.cpp
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HEADERS += \
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webview/tabpreview.h \
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@ -422,7 +424,8 @@ HEADERS += \
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tools/delayedfilewatcher.h \
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autofill/passwordmanager.h \
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autofill/passwordbackends/passwordbackend.h \
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autofill/passwordbackends/databasepasswordbackend.h
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autofill/passwordbackends/databasepasswordbackend.h \
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tools/aesinterface.h
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FORMS += \
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preferences/autofillmanager.ui \
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@ -510,6 +513,8 @@ mac {
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LIBS += -framework CoreServices
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}
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LIBS += -llibeay32
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message(===========================================)
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message( Using following defines:)
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message( $$DEFINES)
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203
src/lib/tools/aesinterface.cpp
Normal file
203
src/lib/tools/aesinterface.cpp
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@ -0,0 +1,203 @@
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/* ============================================================
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* QupZilla - WebKit based browser
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* Copyright (C) 2013 S. Razi Alavizadeh <s.r.alavizadeh@gmail.com>
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* Copyright (C) 2013 David Rosca <nowrep@gmail.com>
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*
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* This is based on a work by Saju Pillai <saju.pillai@gmail.com>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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* ============================================================ */
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#include "aesinterface.h"
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#include <openssl/aes.h>
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#include <openssl/rand.h>
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#include <openssl/sha.h>
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#include <QCryptographicHash>
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#include <QByteArray>
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#include <QMessageBox>
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#include <QDebug>
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//////////////////////////////////////////////
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/// Version 1:
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/// init(): n=5, EVP_CIPHER=EVP_aes_256_cbc(), EVP_MD=EVP_sha256(), Random IV
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/// Encrypted data structure: Version$InitializationVector_base64$EncryptedData_base64
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const int AesInterface::VERSION = 1;
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AesInterface::AesInterface(QObject* parent)
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: QObject(parent)
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, m_ok(false)
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{
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EVP_CIPHER_CTX_init(&m_encodeCTX);
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EVP_CIPHER_CTX_init(&m_decodeCTX);
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}
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AesInterface::~AesInterface()
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{
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EVP_CIPHER_CTX_cleanup(&m_encodeCTX);
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EVP_CIPHER_CTX_cleanup(&m_decodeCTX);
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}
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// Create an 256 bit 'key' using the supplied password, and creates a random 'iv'.
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// saltArray is an array of 8 bytes can be added for taste.
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// Fills in the encryption and decryption ctx objects and returns true on success
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bool AesInterface::init(int evpMode, const QByteArray &password, const QByteArray &iVector)
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{
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m_iVector.clear();
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int i;
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const int nrounds = 5;
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uchar key[EVP_MAX_KEY_LENGTH];
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// Gen "key" for AES 256 CBC mode. A SHA1 digest is used to hash the supplied
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// key material. nrounds is the number of times that we hash the material.
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// More rounds are more secure but slower.
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i = EVP_BytesToKey(EVP_aes_256_cbc(), EVP_sha256(), 0, (uchar*)password.data(), password.size(), nrounds, key, 0);
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if (i != 32) {
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qWarning("Key size is %d bits - should be 256 bits", i * 8);
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return false;
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}
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int result;
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if (evpMode == EVP_PKEY_MO_ENCRYPT) {
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m_iVector = createRandomData(EVP_MAX_IV_LENGTH);
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result = EVP_EncryptInit_ex(&m_encodeCTX, EVP_aes_256_cbc(), NULL, key, (uchar*)m_iVector.constData());
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}
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else if (evpMode == EVP_PKEY_MO_DECRYPT) {
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result = EVP_DecryptInit_ex(&m_decodeCTX, EVP_aes_256_cbc(), NULL, key, (uchar*)iVector.constData());
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}
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if (result == 0) {
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qWarning("EVP is not initialized!");
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return false;
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}
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return true;
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}
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QByteArray AesInterface::encrypt(const QByteArray &plainData, const QByteArray &password)
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{
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if (!init(EVP_PKEY_MO_ENCRYPT, password)) {
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m_ok = false;
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return plainData;
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}
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// max ciphertext len for a n bytes of plaintext is n + AES_BLOCK_SIZE -1 bytes
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int dataLength = plainData.size();
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int cipherlength = dataLength + AES_BLOCK_SIZE;
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int finalLength = 0;
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uchar* ciphertext = (uchar*)malloc(cipherlength);
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// allows reusing of 'm_encodeCTX' for multiple encryption cycles
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EVP_EncryptInit_ex(&m_encodeCTX, NULL, NULL, NULL, NULL);
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// update ciphertext, c_len is filled with the length of ciphertext generated,
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// dataLength is the size of plaintext in bytes
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EVP_EncryptUpdate(&m_encodeCTX, ciphertext, &cipherlength, (uchar*)plainData.data(), dataLength);
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// update ciphertext with the final remaining bytes
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EVP_EncryptFinal_ex(&m_encodeCTX, ciphertext + cipherlength, &finalLength);
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dataLength = cipherlength + finalLength;
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QByteArray out((char*)ciphertext, dataLength);
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out = QByteArray::number(AesInterface::VERSION) + '$' + m_iVector.toBase64() + '$' + out.toBase64();
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free(ciphertext);
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m_ok = true;
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return out;
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}
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QByteArray AesInterface::decrypt(const QByteArray &cipherData, const QByteArray &password)
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{
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m_ok = false;
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if (cipherData.isEmpty()) {
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m_ok = true;
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return QByteArray();
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}
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QList<QByteArray> cipherSections(cipherData.split('$'));
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if (cipherSections.size() != 3) {
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qWarning() << "Decrypt error: It seems data is corrupted";
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return QByteArray();
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}
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if (cipherSections.at(0).toInt() > AesInterface::VERSION) {
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QMessageBox::information(0, tr("Warning!"), tr("Data has been encrypted with a newer version of QupZilla."
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"\nPlease install latest version of QupZilla."));
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return QByteArray();
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}
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if (cipherSections.at(0).toInt() != 1) {
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qWarning() << Q_FUNC_INFO << "There is just version 1 of decoder, yet ;-)";
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return QByteArray();
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}
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if (!init(EVP_PKEY_MO_DECRYPT, password, QByteArray::fromBase64(cipherSections.at(1)))) {
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return QByteArray();
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}
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QByteArray cipherArray = QByteArray::fromBase64(cipherSections.at(2));
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int cipherLength = cipherArray.size();
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int plainTextLength = cipherLength;
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int finalLength = 0;
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uchar* cipherText = (uchar*)cipherArray.data();
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// because we have padding ON, we must allocate an extra cipher block size of memory
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uchar* plainText = (uchar*)malloc(plainTextLength + AES_BLOCK_SIZE);
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EVP_DecryptInit_ex(&m_decodeCTX, NULL, NULL, NULL, NULL);
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EVP_DecryptUpdate(&m_decodeCTX, plainText, &plainTextLength, cipherText, cipherLength);
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int success = EVP_DecryptFinal_ex(&m_decodeCTX, plainText + plainTextLength, &finalLength);
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cipherLength = plainTextLength + finalLength;
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QByteArray result((char*)plainText, cipherLength);
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free(plainText);
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if (success != 1) {
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return QByteArray();
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}
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m_ok = true;
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return result;
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}
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QByteArray AesInterface::passwordToHash(const QString &masterPassword)
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{
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if (!masterPassword.isEmpty()) {
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QByteArray result = masterPassword.toUtf8();
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result = QCryptographicHash::hash(result, QCryptographicHash::Sha1) + result;
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result = QCryptographicHash::hash(result, QCryptographicHash::Sha1);
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return result.toBase64();
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}
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else {
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return QByteArray();
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}
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}
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QByteArray AesInterface::createRandomData(int length)
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{
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uchar* randomData = (uchar*)malloc(length);
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if (RAND_bytes(randomData, length) != 1) {
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RAND_pseudo_bytes(randomData, length);
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}
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QByteArray data((char*)randomData, length);
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free(randomData);
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return data;
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}
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58
src/lib/tools/aesinterface.h
Normal file
58
src/lib/tools/aesinterface.h
Normal file
@ -0,0 +1,58 @@
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/* ============================================================
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* QupZilla - WebKit based browser
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* Copyright (C) 2013 S. Razi Alavizadeh <s.r.alavizadeh@gmail.com>
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* Copyright (C) 2013 David Rosca <nowrep@gmail.com>
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*
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* This is based on a work by Saju Pillai <saju.pillai@gmail.com>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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* ============================================================ */
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#ifndef AESINTERFACE_H
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#define AESINTERFACE_H
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#include "qz_namespace.h"
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#include <openssl/evp.h>
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#include <QObject>
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#include <QHash>
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#include <QList>
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class QT_QUPZILLA_EXPORT AesInterface : public QObject
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{
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public:
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static const int VERSION;
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explicit AesInterface(QObject* parent = 0);
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~AesInterface();
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inline bool isOk() { return m_ok; }
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QByteArray encrypt(const QByteArray &plainData, const QByteArray &password);
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QByteArray decrypt(const QByteArray &cipherData, const QByteArray &password);
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static void encryptSomeData(const QByteArray &pass = QByteArray());
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static QByteArray passwordToHash(const QString &masterPassword);
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static QByteArray createRandomData(int length);
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private:
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bool init(int evpMode, const QByteArray &password, const QByteArray &iVector = QByteArray());
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EVP_CIPHER_CTX m_encodeCTX;
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EVP_CIPHER_CTX m_decodeCTX;
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bool m_ok;
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QByteArray m_iVector;
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};
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#endif //AESINTERFACE_H
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