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YubiKey: Clean-up master seed challenge

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* Tweak the logic so it more closely resembles other code (i.e.
  trasnformKey()). Matches existing style better.
* Save the challengeResponseKey in the database structure so that
  it can be referred to later (i.e. database unlocking).

Signed-off-by: Kyle Manna <kyle@kylemanna.com>
This commit is contained in:
Kyle Manna 2014-09-07 16:37:46 -07:00
parent 62190d79be
commit 77cc99acd3
4 changed files with 14 additions and 9 deletions
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9
src/core/Database.cpp
View File

@ -176,9 +176,14 @@ QByteArray Database::transformedMasterKey() const
return m_data.transformedMasterKey;
}
bool Database::challengeMasterSeed(const QByteArray& masterSeed, QByteArray& result) const
QByteArray Database::challengeResponseKey() const
{
return m_data.key.challenge(masterSeed, result);
return m_data.challengeResponseKey;
}
bool Database::challengeMasterSeed(const QByteArray& masterSeed)
{
return m_data.key.challenge(masterSeed, m_data.challengeResponseKey);
}
void Database::setCipher(const Uuid& cipher)

4
src/core/Database.h
View File

@ -59,6 +59,7 @@ public:
QByteArray transformedMasterKey;
CompositeKey key;
bool hasKey;
QByteArray challengeResponseKey;
};
Database();
@ -89,7 +90,8 @@ public:
quint64 transformRounds() const;
QByteArray transformedMasterKey() const;
const CompositeKey & key() const;
bool challengeMasterSeed(const QByteArray& masterSeed, QByteArray& result) const;
QByteArray challengeResponseKey() const;
bool challengeMasterSeed(const QByteArray& masterSeed);
void setCipher(const Uuid& cipher);
void setCompressionAlgo(Database::CompressionAlgorithm algo);

5
src/format/KeePass2Reader.cpp
View File

@ -113,15 +113,14 @@ Database* KeePass2Reader::readDatabase(QIODevice* device, const CompositeKey& ke
return nullptr;
}
QByteArray challengeResult;
if (m_db->challengeMasterSeed(m_masterSeed, challengeResult) == false) {
if (m_db->challengeMasterSeed(m_masterSeed) == false) {
raiseError(tr("Unable to issue challenge-response."));
return Q_NULLPTR;
}
CryptoHash hash(CryptoHash::Sha256);
hash.addData(m_masterSeed);
hash.addData(challengeResult);
hash.addData(m_db->challengeResponseKey());
hash.addData(m_db->transformedMasterKey());
QByteArray finalKey = hash.result();

5
src/format/KeePass2Writer.cpp
View File

@ -51,15 +51,14 @@ void KeePass2Writer::writeDatabase(QIODevice* device, Database* db)
QByteArray startBytes = randomGen()->randomArray(32);
QByteArray endOfHeader = "\r\n\r\n";
QByteArray challengeResult;
if (db->challengeMasterSeed(masterSeed, challengeResult) == false) {
if (db->challengeMasterSeed(masterSeed) == false) {
raiseError("Unable to issue challenge-response.");
return;
}
CryptoHash hash(CryptoHash::Sha256);
hash.addData(masterSeed);
hash.addData(challengeResult);
hash.addData(db->challengeResponseKey());
Q_ASSERT(!db->transformedMasterKey().isEmpty());
hash.addData(db->transformedMasterKey());
QByteArray finalKey = hash.result();