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Add client side encrypt and decrypt for API communication
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| /* | ||
| Copyright (c) 2011, Andre Somers | ||
| All rights reserved. | ||
| Redistribution and use in source and binary forms, with or without | ||
| modification, are permitted provided that the following conditions are met: | ||
| * Redistributions of source code must retain the above copyright | ||
| notice, this list of conditions and the following disclaimer. | ||
| * Redistributions in binary form must reproduce the above copyright | ||
| notice, this list of conditions and the following disclaimer in the | ||
| documentation and/or other materials provided with the distribution. | ||
| * Neither the name of the Rathenau Instituut, Andre Somers nor the | ||
| names of its contributors may be used to endorse or promote products | ||
| derived from this software without specific prior written permission. | ||
| THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND | ||
| ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED | ||
| WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | ||
| DISCLAIMED. IN NO EVENT SHALL ANDRE SOMERS BE LIABLE FOR ANY | ||
| DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES | ||
| (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; | ||
| LOSS OF USE, DATA, OR #######; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND | ||
| ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | ||
| (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | ||
| SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | ||
| */ | ||
| #include "simplecrypt.h" | ||
| #include <QByteArray> | ||
| #include <QtDebug> | ||
| #include <QtGlobal> | ||
| #include <QDateTime> | ||
| #include <QCryptographicHash> | ||
| #include <QDataStream> | ||
|
|
||
| SimpleCrypt::SimpleCrypt(): | ||
| m_key(0), | ||
| m_compressionMode(CompressionAuto), | ||
| m_protectionMode(ProtectionChecksum), | ||
| m_lastError(ErrorNoError) | ||
| { | ||
| qsrand(uint(QDateTime::currentMSecsSinceEpoch() & 0xFFFF)); | ||
| } | ||
|
|
||
| SimpleCrypt::SimpleCrypt(quint64 key): | ||
| m_key(key), | ||
| m_compressionMode(CompressionAuto), | ||
| m_protectionMode(ProtectionChecksum), | ||
| m_lastError(ErrorNoError) | ||
| { | ||
| qsrand(uint(QDateTime::currentMSecsSinceEpoch() & 0xFFFF)); | ||
| splitKey(); | ||
| } | ||
|
|
||
| void SimpleCrypt::setKey(quint64 key) | ||
| { | ||
| m_key = key; | ||
| splitKey(); | ||
| } | ||
|
|
||
| void SimpleCrypt::splitKey() | ||
| { | ||
| m_keyParts.clear(); | ||
| m_keyParts.resize(8); | ||
| for (int i=0;i<8;i++) { | ||
| quint64 part = m_key; | ||
| for (int j=i; j>0; j--) | ||
| part = part >> 8; | ||
| part = part & 0xff; | ||
| m_keyParts[i] = static_cast<char>(part); | ||
| } | ||
| } | ||
|
|
||
| QByteArray SimpleCrypt::encryptToByteArray(const QString& plaintext) | ||
| { | ||
| QByteArray plaintextArray = plaintext.toUtf8(); | ||
| return encryptToByteArray(plaintextArray); | ||
| } | ||
|
|
||
| QByteArray SimpleCrypt::encryptToByteArray(QByteArray plaintext) | ||
| { | ||
| if (m_keyParts.isEmpty()) { | ||
| qWarning() << "No key set."; | ||
| m_lastError = ErrorNoKeySet; | ||
| return QByteArray(); | ||
| } | ||
|
|
||
|
|
||
| QByteArray ba = plaintext; | ||
|
|
||
| CryptoFlags flags = CryptoFlagNone; | ||
| if (m_compressionMode == CompressionAlways) { | ||
| ba = qCompress(ba, 9); //maximum compression | ||
| flags |= CryptoFlagCompression; | ||
| } else if (m_compressionMode == CompressionAuto) { | ||
| QByteArray compressed = qCompress(ba, 9); | ||
| if (compressed.count() < ba.count()) { | ||
| ba = compressed; | ||
| flags |= CryptoFlagCompression; | ||
| } | ||
| } | ||
|
|
||
| QByteArray integrityProtection; | ||
| if (m_protectionMode == ProtectionChecksum) { | ||
| flags |= CryptoFlagChecksum; | ||
| QDataStream s(&integrityProtection, QIODevice::WriteOnly); | ||
| s << qChecksum(ba.constData(), ba.length()); | ||
| } else if (m_protectionMode == ProtectionHash) { | ||
| flags |= CryptoFlagHash; | ||
| QCryptographicHash hash(QCryptographicHash::Sha1); | ||
| hash.addData(ba); | ||
|
|
||
| integrityProtection += hash.result(); | ||
| } | ||
|
|
||
| //prepend a random char to the string | ||
| char randomChar = char(qrand() & 0xFF); | ||
| ba = randomChar + integrityProtection + ba; | ||
|
|
||
| int pos(0); | ||
| char lastChar(0); | ||
|
|
||
| int cnt = ba.count(); | ||
|
|
||
| while (pos < cnt) { | ||
| ba[pos] = ba.at(pos) ^ m_keyParts.at(pos % 8) ^ lastChar; | ||
| lastChar = ba.at(pos); | ||
| ++pos; | ||
| } | ||
|
|
||
| QByteArray resultArray; | ||
| resultArray.append(char(0x03)); //version for future updates to algorithm | ||
| resultArray.append(char(flags)); //encryption flags | ||
| resultArray.append(ba); | ||
|
|
||
| m_lastError = ErrorNoError; | ||
| return resultArray; | ||
| } | ||
|
|
||
| QString SimpleCrypt::encryptToString(const QString& plaintext) | ||
| { | ||
| QByteArray plaintextArray = plaintext.toUtf8(); | ||
| QByteArray cypher = encryptToByteArray(plaintextArray); | ||
| QString cypherString = QString::fromLatin1(cypher.toBase64()); | ||
| return cypherString; | ||
| } | ||
|
|
||
| QString SimpleCrypt::encryptToString(QByteArray plaintext) | ||
| { | ||
| QByteArray cypher = encryptToByteArray(plaintext); | ||
| QString cypherString = QString::fromLatin1(cypher.toBase64()); | ||
| return cypherString; | ||
| } | ||
|
|
||
| QString SimpleCrypt::decryptToString(const QString &cyphertext) | ||
| { | ||
| QByteArray cyphertextArray = QByteArray::fromBase64(cyphertext.toLatin1()); | ||
| QByteArray plaintextArray = decryptToByteArray(cyphertextArray); | ||
| QString plaintext = QString::fromUtf8(plaintextArray, plaintextArray.size()); | ||
|
|
||
| return plaintext; | ||
| } | ||
|
|
||
| QString SimpleCrypt::decryptToString(QByteArray cypher) | ||
| { | ||
| QByteArray ba = decryptToByteArray(cypher); | ||
| QString plaintext = QString::fromUtf8(ba, ba.size()); | ||
|
|
||
| return plaintext; | ||
| } | ||
|
|
||
| QByteArray SimpleCrypt::decryptToByteArray(const QString& cyphertext) | ||
| { | ||
| QByteArray cyphertextArray = QByteArray::fromBase64(cyphertext.toLatin1()); | ||
| QByteArray ba = decryptToByteArray(cyphertextArray); | ||
|
|
||
| return ba; | ||
| } | ||
|
|
||
| QByteArray SimpleCrypt::decryptToByteArray(QByteArray cypher) | ||
| { | ||
| if (m_keyParts.isEmpty()) { | ||
| qWarning() << "No key set."; | ||
| m_lastError = ErrorNoKeySet; | ||
| return QByteArray(); | ||
| } | ||
|
|
||
| QByteArray ba = cypher; | ||
|
|
||
| if( cypher.count() < 3 ) | ||
| return QByteArray(); | ||
|
|
||
| char version = ba.at(0); | ||
|
|
||
| if (version !=3) { //we only work with version 3 | ||
| m_lastError = ErrorUnknownVersion; | ||
| qWarning() << "Invalid version or not a cyphertext."; | ||
| return QByteArray(); | ||
| } | ||
|
|
||
| CryptoFlags flags = CryptoFlags(ba.at(1)); | ||
|
|
||
| ba = ba.mid(2); | ||
| int pos(0); | ||
| int cnt(ba.count()); | ||
| char lastChar = 0; | ||
|
|
||
| while (pos < cnt) { | ||
| char currentChar = ba[pos]; | ||
| ba[pos] = ba.at(pos) ^ lastChar ^ m_keyParts.at(pos % 8); | ||
| lastChar = currentChar; | ||
| ++pos; | ||
| } | ||
|
|
||
| ba = ba.mid(1); //chop off the random number at the start | ||
|
|
||
| bool integrityOk(true); | ||
| if (flags.testFlag(CryptoFlagChecksum)) { | ||
| if (ba.length() < 2) { | ||
| m_lastError = ErrorIntegrityFailed; | ||
| return QByteArray(); | ||
| } | ||
| quint16 storedChecksum; | ||
| { | ||
| QDataStream s(&ba, QIODevice::ReadOnly); | ||
| s >> storedChecksum; | ||
| } | ||
| ba = ba.mid(2); | ||
| quint16 checksum = qChecksum(ba.constData(), ba.length()); | ||
| integrityOk = (checksum == storedChecksum); | ||
| } else if (flags.testFlag(CryptoFlagHash)) { | ||
| if (ba.length() < 20) { | ||
| m_lastError = ErrorIntegrityFailed; | ||
| return QByteArray(); | ||
| } | ||
| QByteArray storedHash = ba.left(20); | ||
| ba = ba.mid(20); | ||
| QCryptographicHash hash(QCryptographicHash::Sha1); | ||
| hash.addData(ba); | ||
| integrityOk = (hash.result() == storedHash); | ||
| } | ||
|
|
||
| if (!integrityOk) { | ||
| m_lastError = ErrorIntegrityFailed; | ||
| return QByteArray(); | ||
| } | ||
|
|
||
| if (flags.testFlag(CryptoFlagCompression)) | ||
| ba = qUncompress(ba); | ||
|
|
||
| m_lastError = ErrorNoError; | ||
| return ba; | ||
| } |
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