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/*
* Copyright (C) 2015-2016 Département de l'Instruction Publique (DIP-SEM)
*
* Copyright (C) 2013 Open Education Foundation
*
* Copyright (C) 2010-2013 Groupement d'Intérêt Public pour
* l'Education Numérique en Afrique (GIP ENA)
*
* This file is part of OpenBoard.
*
* OpenBoard 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, version 3 of the License,
* with a specific linking exception for the OpenSSL project's
* "OpenSSL" library (or with modified versions of it that use the
* same license as the "OpenSSL" library).
*
* OpenBoard 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 OpenBoard. If not, see <http://www.gnu.org/licenses/>.
*/
#include "UBCryptoUtils.h"
#include <openssl/aes.h>
#include "core/memcheck.h"
UBCryptoUtils* UBCryptoUtils::sInstance(0);
QString UBCryptoUtils::sAESKey("9ecHaspud9uD9ste5erAchehefrup3echej-caje6&thestawacuk=h#F3jet3aF");
QString UBCryptoUtils::sAESSalt("6f0083e0-a90c-11de-ac21-0002a5d5c51b");
UBCryptoUtils* UBCryptoUtils::instance()
{
if(!sInstance)
sInstance = new UBCryptoUtils(UBApplication::staticMemoryCleaner);
return sInstance;
}
void UBCryptoUtils::destroy()
{
if (sInstance)
delete sInstance;
sInstance = NULL;
}
UBCryptoUtils::UBCryptoUtils(QObject * pParent)
: QObject(pParent)
{
aesInit();
}
UBCryptoUtils::~UBCryptoUtils()
{
// TODO UB 4.x aes destroy
}
QString UBCryptoUtils::symetricEncrypt(const QString& clear)
{
QByteArray clearData = clear.toUtf8();
int cipheredLength = clearData.length() + AES_BLOCK_SIZE;
int paddingLength = 0;
unsigned char *ciphertext = (unsigned char *)malloc(cipheredLength);
if(!EVP_EncryptInit_ex(&mAesEncryptContext, NULL, NULL, NULL, NULL)){
free(ciphertext);
return QString();
}
if(!EVP_EncryptUpdate(&mAesEncryptContext, ciphertext, &cipheredLength, (unsigned char *)clearData.data(), clearData.length())){
free(ciphertext);
return QString();
}
/* update ciphertext with the final remaining bytes */
if(!EVP_EncryptFinal_ex(&mAesEncryptContext, ciphertext + cipheredLength, &paddingLength)){
free(ciphertext);
return QString();
}
QByteArray cipheredData((const char *)ciphertext, cipheredLength + paddingLength);
free(ciphertext);
return QString::fromLatin1(cipheredData.toBase64());
}
QString UBCryptoUtils::symetricDecrypt(const QString& encrypted)
{
QByteArray encryptedData = QByteArray::fromBase64(encrypted.toLatin1());
int encryptedLength = encryptedData.length();
int paddingLength = 0;
unsigned char *plaintext = (unsigned char *)malloc(encryptedLength);
if(!EVP_DecryptInit_ex(&mAesDecryptContext, NULL, NULL, NULL, NULL)){
free(plaintext);
return QString();
}
if(!EVP_DecryptUpdate(&mAesDecryptContext, plaintext, &encryptedLength, (const unsigned char *)encryptedData.data(), encryptedData.length())){
free(plaintext);
return QString();
}
if(!EVP_DecryptFinal_ex(&mAesDecryptContext, plaintext + encryptedLength, &paddingLength)){
free(plaintext);
return QString();
}
int len = encryptedLength + paddingLength;
QByteArray clearData((const char *)plaintext, len);
free(plaintext);
return QString::fromUtf8(clearData);;
}
void UBCryptoUtils::aesInit()
{
int i, nrounds = 5;
unsigned char key[32], iv[32];
unsigned char *key_data = (unsigned char *)sAESKey.toLatin1().data();
int key_data_len = sAESKey.length();
i = EVP_BytesToKey(EVP_aes_256_cbc(), EVP_sha1(), (unsigned char *)sAESSalt.toLatin1().data(), key_data,
key_data_len, nrounds, key, iv);
if (i != 32)
{
qWarning() << QString("Key size is %1 bits - should be 256 bits").arg(i);
return;
}
EVP_CIPHER_CTX_init(&mAesEncryptContext);
EVP_EncryptInit_ex(&mAesEncryptContext, EVP_aes_256_cbc(), NULL, key, iv);
EVP_CIPHER_CTX_init(&mAesDecryptContext);
EVP_DecryptInit_ex(&mAesDecryptContext, EVP_aes_256_cbc(), NULL, key, iv);
}