Java Code Examples for net.bither.bitherj.crypto.ECKey#getPrivKeyBytes()

The following examples show how to use net.bither.bitherj.crypto.ECKey#getPrivKeyBytes() . You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.
Example 1
Source File: Bip38.java    From bitherj with Apache License 2.0 4 votes vote down vote up 
public static String encryptNoEcMultiply(byte[] stretcedKeyMaterial, ECKey key, byte[] salt) {

        // Encoded result
        int checksumLength = 4;
        byte[] encoded = new byte[39 + checksumLength];
        int index = 0;
        encoded[index++] = (byte) 0x01;
        encoded[index++] = (byte) 0x42;

        // Flags byte
        byte non_EC_multiplied = (byte) 0xC0;
        byte compressedPublicKey = key.isCompressed() ? (byte) 0x20 : (byte) 0;
        encoded[index++] = (byte) (non_EC_multiplied | compressedPublicKey);

        // Salt
        System.arraycopy(salt, 0, encoded, index, salt.length);
        index += salt.length;

        // Derive Keys
        byte[] derivedHalf1 = new byte[32];
        System.arraycopy(stretcedKeyMaterial, 0, derivedHalf1, 0, 32);
        byte[] derivedHalf2 = new byte[32];
        System.arraycopy(stretcedKeyMaterial, 32, derivedHalf2, 0, 32);

        // Initialize AES key
        Rijndael aes = new Rijndael();
        aes.makeKey(derivedHalf2, 256);

        // Get private key bytes
        byte[] complete = key.getPrivKeyBytes();

        // Insert first encrypted key part
        byte[] toEncryptPart1 = new byte[16];
        for (int i = 0; i < 16; i++) {
            toEncryptPart1[i] = (byte) ((((int) complete[i]) & 0xFF) ^ (((int) derivedHalf1[i]) & 0xFF));
        }
        byte[] encryptedHalf1 = new byte[16];
        aes.encrypt(toEncryptPart1, encryptedHalf1);
        System.arraycopy(encryptedHalf1, 0, encoded, index, encryptedHalf1.length);
        index += encryptedHalf1.length;

        // Insert second encrypted key part
        byte[] toEncryptPart2 = new byte[16];
        for (int i = 0; i < 16; i++) {
            toEncryptPart2[i] = (byte) ((((int) complete[16 + i]) & 0xFF) ^ (((int) derivedHalf1[16 + i]) & 0xFF));
        }
        byte[] encryptedHalf2 = new byte[16];
        aes.encrypt(toEncryptPart2, encryptedHalf2);
        System.arraycopy(encryptedHalf2, 0, encoded, index, encryptedHalf2.length);
        index += encryptedHalf2.length;

        // Checksum
        Sha256Hash checkSum = Bip38Util.doubleSha256(encoded, 0, 39);
        byte[] start = checkSum.firstFourBytes();
        System.arraycopy(start, 0, encoded, 39, checksumLength);

        // Base58 encode
        String result = Bip38Util.encode(encoded);
        return result;
    }
Example 2
Source File: Bip38.java    From bitherj with Apache License 2.0 4 votes vote down vote up 
public static SecureCharSequence decryptNoEcMultiply(Bip38PrivateKey bip38Key, byte[] stretcedKeyMaterial) throws AddressFormatException {
    // Derive Keys
    byte[] derivedHalf1 = new byte[32];
    System.arraycopy(stretcedKeyMaterial, 0, derivedHalf1, 0, 32);
    byte[] derivedHalf2 = new byte[32];
    System.arraycopy(stretcedKeyMaterial, 32, derivedHalf2, 0, 32);

    // Initialize AES key
    Rijndael aes = new Rijndael();
    aes.makeKey(derivedHalf2, 256);

    // Fetch first encrypted half
    byte[] encryptedHalf1 = new byte[16];
    System.arraycopy(bip38Key.data, 0, encryptedHalf1, 0, encryptedHalf1.length);

    // Fetch second encrypted half
    byte[] encryptedHalf2 = new byte[16];
    System.arraycopy(bip38Key.data, 16, encryptedHalf2, 0, encryptedHalf2.length);

    byte[] decryptedHalf1 = new byte[16];
    aes.decrypt(encryptedHalf1, decryptedHalf1);

    byte[] decryptedHalf2 = new byte[16];
    aes.decrypt(encryptedHalf2, decryptedHalf2);

    byte[] complete = new byte[32];
    for (int i = 0; i < 16; i++) {
        complete[i] = (byte) ((((int) decryptedHalf1[i]) & 0xFF) ^ (((int) derivedHalf1[i]) & 0xFF));
        complete[i + 16] = (byte) ((((int) decryptedHalf2[i]) & 0xFF) ^ (((int) derivedHalf1[i + 16]) & 0xFF));
    }

    // Create private key
    ECKey key = new ECKey(new BigInteger(1, complete), null, bip38Key.compressed);

    // Validate result

    byte[] newSalt = calculateScryptSalt(key.toAddress());
    if (!Arrays.equals(bip38Key.salt, newSalt)) {
        // The passphrase is either invalid or we are on the wrong network
        return null;
    }

    // Get SIPA format
    DumpedPrivateKey dumpedPrivateKey = new DumpedPrivateKey(key.getPrivKeyBytes(), key.isCompressed());

    SecureCharSequence secureCharSequence = dumpedPrivateKey.toSecureCharSequence();
    dumpedPrivateKey.clearPrivateKey();
    key.clearPrivateKey();
    return secureCharSequence;
}