Examples with PwDbHeaderV3 com.keepassdroid.database.PwDbHeaderV3 used on opensource projects

Example 6 with PwDbHeaderV3

use of com.keepassdroid.database.PwDbHeaderV3 in project keepass2android by PhilippC.

the class ImporterV3 method openDatabase.

public PwDatabaseV3 openDatabase(InputStream inStream, String password, InputStream keyfileStream, UpdateStatus status) throws IOException, InvalidDBException {
    PwDatabaseV3 newManager;
    // Load entire file, most of it's encrypted.
    ByteArrayOutputStream buffer = new ByteArrayOutputStream();
    int nRead;
    byte[] data = new byte[16384];
    while ((nRead = inStream.read(data, 0, data.length)) != -1) {
        buffer.write(data, 0, nRead);
    }
    buffer.flush();
    int fileSize = buffer.size();
    // Pad with a blocksize (Twofish uses 128 bits), since Android 4.3 tries to write more to the buffer
    for (int i = 0; i < 16; i++) {
        buffer.write(0);
    }
    inStream.close();
    byte[] filebuf = buffer.toByteArray();
    // Parse header (unencrypted)
    if (fileSize < PwDbHeaderV3.BUF_SIZE)
        throw new IOException("File too short for header: " + fileSize + "<" + PwDbHeaderV3.BUF_SIZE);
    PwDbHeaderV3 hdr = new PwDbHeaderV3();
    hdr.loadFromFile(filebuf, 0);
    if ((hdr.signature1 != PwDbHeader.PWM_DBSIG_1) || (hdr.signature2 != PwDbHeaderV3.DBSIG_2)) {
        throw new InvalidDBSignatureException();
    }
    if (!hdr.matchesVersion()) {
        throw new InvalidDBVersionException();
    }
    newManager = createDB();
    newManager.setMasterKey(password, keyfileStream);
    // Select algorithm
    if ((hdr.flags & PwDbHeaderV3.FLAG_RIJNDAEL) != 0) {
        newManager.algorithm = PwEncryptionAlgorithm.Rjindal;
    } else if ((hdr.flags & PwDbHeaderV3.FLAG_TWOFISH) != 0) {
        newManager.algorithm = PwEncryptionAlgorithm.Twofish;
    } else {
        throw new InvalidAlgorithmException();
    }
    // Copy for testing
    newManager.copyHeader(hdr);
    newManager.numKeyEncRounds = hdr.numKeyEncRounds;
    newManager.name = "KeePass Password Manager";
    // Generate transformedMasterKey from masterKey
    newManager.makeFinalKey(hdr.masterSeed, hdr.transformSeed, newManager.numKeyEncRounds);
    // Initialize Rijndael algorithm
    Cipher cipher;
    try {
        if (newManager.algorithm == PwEncryptionAlgorithm.Rjindal) {
            cipher = CipherFactory.getInstance("AES/CBC/PKCS5Padding");
        } else if (newManager.algorithm == PwEncryptionAlgorithm.Twofish) {
            cipher = CipherFactory.getInstance("TWOFISH/CBC/PKCS7PADDING");
        } else {
            throw new IOException("Encryption algorithm is not supported");
        }
    } catch (NoSuchAlgorithmException e1) {
        throw new IOException("No such algorithm");
    } catch (NoSuchPaddingException e1) {
        throw new IOException("No such pdading");
    }
    try {
        cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(newManager.finalKey, "AES"), new IvParameterSpec(hdr.encryptionIV));
    } catch (InvalidKeyException e1) {
        throw new IOException("Invalid key");
    } catch (InvalidAlgorithmParameterException e1) {
        throw new IOException("Invalid algorithm parameter.");
    }
    // Decrypt! The first bytes aren't encrypted (that's the header)
    int encryptedPartSize;
    try {
        encryptedPartSize = cipher.doFinal(filebuf, PwDbHeaderV3.BUF_SIZE, fileSize - PwDbHeaderV3.BUF_SIZE, filebuf, PwDbHeaderV3.BUF_SIZE);
    } catch (ShortBufferException e1) {
        throw new IOException("Buffer too short");
    } catch (IllegalBlockSizeException e1) {
        throw new IOException("Invalid block size");
    } catch (BadPaddingException e1) {
        throw new InvalidPasswordException("Invalid key!");
    }
    // Copy decrypted data for testing
    newManager.copyEncrypted(filebuf, PwDbHeaderV3.BUF_SIZE, encryptedPartSize);
    MessageDigest md = null;
    try {
        md = MessageDigest.getInstance("SHA-256");
    } catch (NoSuchAlgorithmException e) {
        throw new IOException("No SHA-256 algorithm");
    }
    NullOutputStream nos = new NullOutputStream();
    DigestOutputStream dos = new DigestOutputStream(nos, md);
    dos.write(filebuf, PwDbHeaderV3.BUF_SIZE, encryptedPartSize);
    dos.close();
    byte[] hash = md.digest();
    if (!Arrays.equals(hash, hdr.contentsHash)) {
        Log.w("KeePassDroid", "Database file did not decrypt correctly. (checksum code is broken)");
        throw new InvalidPasswordException("Invalid key!");
    }
    // Import all groups
    int pos = PwDbHeaderV3.BUF_SIZE;
    PwGroupV3 newGrp = new PwGroupV3();
    for (int i = 0; i < hdr.numGroups; ) {
        int fieldType = LEDataInputStream.readUShort(filebuf, pos);
        pos += 2;
        int fieldSize = LEDataInputStream.readInt(filebuf, pos);
        pos += 4;
        if (fieldType == 0xFFFF) {
            // End-Group record.  Save group and count it.
            newGrp.populateBlankFields(newManager);
            newManager.groups.add(newGrp);
            newGrp = new PwGroupV3();
            i++;
        } else {
            readGroupField(newManager, newGrp, fieldType, filebuf, pos);
        }
        pos += fieldSize;
    }
    // Import all entries
    PwEntryV3 newEnt = new PwEntryV3();
    for (int i = 0; i < hdr.numEntries; ) {
        int fieldType = LEDataInputStream.readUShort(filebuf, pos);
        int fieldSize = LEDataInputStream.readInt(filebuf, pos + 2);
        if (fieldType == 0xFFFF) {
            // End-Group record.  Save group and count it.
            newEnt.populateBlankFields(newManager);
            newManager.entries.add(newEnt);
            newEnt = new PwEntryV3();
            i++;
        } else {
            readEntryField(newManager, newEnt, filebuf, pos);
        }
        pos += 2 + 4 + fieldSize;
    }
    newManager.constructTree(null);
    return newManager;
}

Example 7 with PwDbHeaderV3

use of com.keepassdroid.database.PwDbHeaderV3 in project KeePassDX by Kunzisoft.

the class PwDbV3Output method getFinalKey.

public byte[] getFinalKey(PwDbHeader header) throws PwDbOutputException {
    try {
        PwDbHeaderV3 h3 = (PwDbHeaderV3) header;
        mPM.makeFinalKey(h3.masterSeed, h3.transformSeed, mPM.numKeyEncRounds);
        return mPM.finalKey;
    } catch (IOException e) {
        throw new PwDbOutputException("Key creation failed: " + e.getMessage());
    }
}

Example 8 with PwDbHeaderV3

use of com.keepassdroid.database.PwDbHeaderV3 in project keepass2android by PhilippC.

the class PwDbV3Output method outputHeader.

public PwDbHeader outputHeader(OutputStream os) throws PwDbOutputException {
    // Build header
    PwDbHeaderV3 header = new PwDbHeaderV3();
    header.signature1 = PwDbHeader.PWM_DBSIG_1;
    header.signature2 = PwDbHeaderV3.DBSIG_2;
    header.flags = PwDbHeaderV3.FLAG_SHA2;
    if (mPM.getEncAlgorithm() == PwEncryptionAlgorithm.Rjindal) {
        header.flags |= PwDbHeaderV3.FLAG_RIJNDAEL;
    } else if (mPM.getEncAlgorithm() == PwEncryptionAlgorithm.Twofish) {
        header.flags |= PwDbHeaderV3.FLAG_TWOFISH;
    } else {
        throw new PwDbOutputException("Unsupported algorithm.");
    }
    header.version = PwDbHeaderV3.DBVER_DW;
    header.numGroups = mPM.getGroups().size();
    header.numEntries = mPM.entries.size();
    header.numKeyEncRounds = mPM.getNumKeyEncRecords();
    setIVs(header);
    // Write checksum Checksum
    MessageDigest md = null;
    try {
        md = MessageDigest.getInstance("SHA-256");
    } catch (NoSuchAlgorithmException e) {
        throw new PwDbOutputException("SHA-256 not implemented here.");
    }
    NullOutputStream nos;
    nos = new NullOutputStream();
    DigestOutputStream dos = new DigestOutputStream(nos, md);
    BufferedOutputStream bos = new BufferedOutputStream(dos);
    try {
        outputPlanGroupAndEntries(bos);
        bos.flush();
        bos.close();
    } catch (IOException e) {
        throw new PwDbOutputException("Failed to generate checksum.");
    }
    header.contentsHash = md.digest();
    // Output header
    PwDbHeaderOutputV3 pho = new PwDbHeaderOutputV3(header, os);
    try {
        pho.output();
    } catch (IOException e) {
        throw new PwDbOutputException("Failed to output the header.");
    }
    return header;
}