Esempio n. 1
0
void Packet::armor(const void *key,bool encryptPayload)
{
	unsigned char mangledKey[32];
	unsigned char macKey[32];
	unsigned char mac[16];
	const unsigned int payloadLen = size() - ZT_PACKET_IDX_VERB;
	unsigned char *const payload = field(ZT_PACKET_IDX_VERB,payloadLen);

	// Set flag now, since it affects key mangle function
	setCipher(encryptPayload ? ZT_PROTO_CIPHER_SUITE__C25519_POLY1305_SALSA2012 : ZT_PROTO_CIPHER_SUITE__C25519_POLY1305_NONE);

	_salsa20MangleKey((const unsigned char *)key,mangledKey);
	Salsa20 s20(mangledKey,256,field(ZT_PACKET_IDX_IV,8)/*,ZT_PROTO_SALSA20_ROUNDS*/);

	// MAC key is always the first 32 bytes of the Salsa20 key stream
	// This is the same construction DJB's NaCl library uses
	s20.encrypt12(ZERO_KEY,macKey,sizeof(macKey));

	if (encryptPayload)
		s20.encrypt12(payload,payload,payloadLen);

	Poly1305::compute(mac,payload,payloadLen,macKey);
	memcpy(field(ZT_PACKET_IDX_MAC,8),mac,8);
}
Esempio n. 2
0
bool KeePass2Reader::readHeaderField()
{
    QByteArray fieldIDArray = m_headerStream->read(1);
    if (fieldIDArray.size() != 1) {
        raiseError("Invalid header id size");
        return false;
    }
    quint8 fieldID = fieldIDArray.at(0);

    bool ok;
    quint16 fieldLen = Endian::readUInt16(m_headerStream, KeePass2::BYTEORDER, &ok);
    if (!ok) {
        raiseError("Invalid header field length");
        return false;
    }

    QByteArray fieldData;
    if (fieldLen != 0) {
        fieldData = m_headerStream->read(fieldLen);
        if (fieldData.size() != fieldLen) {
            raiseError("Invalid header data length");
            return false;
        }
    }

    switch (fieldID) {
    case KeePass2::EndOfHeader:
        m_headerEnd = true;
        break;

    case KeePass2::CipherID:
        setCipher(fieldData);
        break;

    case KeePass2::CompressionFlags:
        setCompressionFlags(fieldData);
        break;

    case KeePass2::MasterSeed:
        setMasterSeed(fieldData);
        break;

    case KeePass2::TransformSeed:
        setTransformSeed(fieldData);
        break;

    case KeePass2::TransformRounds:
        setTansformRounds(fieldData);
        break;

    case KeePass2::EncryptionIV:
        setEncryptionIV(fieldData);
        break;

    case KeePass2::ProtectedStreamKey:
        setProtectedStreamKey(fieldData);
        break;

    case KeePass2::StreamStartBytes:
        setStreamStartBytes(fieldData);
        break;

    case KeePass2::InnerRandomStreamID:
        setInnerRandomStreamID(fieldData);
        break;

    default:
        qWarning("Unknown header field read: id=%d", fieldID);
        break;
    }

    return !m_headerEnd;
}