Java Code Examples for org.bitcoinj.core.ECKey#decrypt()

@Nullable
private ECKey maybeDecrypt(ECKey key) {
    if (key == null)
        return null;
    else if (key.isEncrypted()) {
        if (aesKey == null)
            throw new ECKey.KeyIsEncryptedException();
        return key.decrypt(aesKey);
    } else {
        return key;
    }
}
 

/**
 * Check whether the AES key can decrypt the first encrypted key in the wallet.
 *
 * @return true if AES key supplied can decrypt the first encrypted private key in the wallet, false otherwise.
 */
@Override
public boolean checkAESKey(KeyParameter aesKey) {
    lock.lock();
    try {
        // If no keys then cannot decrypt.
        if (hashToKeys.isEmpty())
            return false;
        checkState(keyCrypter != null, "Key chain is not encrypted");

        // Find the first encrypted key in the wallet.
        ECKey first = null;
        for (ECKey key : hashToKeys.values()) {
            if (key.isEncrypted()) {
                first = key;
                break;
            }
        }
        checkState(first != null, "No encrypted keys in the wallet");

        try {
            ECKey rebornKey = first.decrypt(aesKey);
            return Arrays.equals(first.getPubKey(), rebornKey.getPubKey());
        } catch (KeyCrypterException e) {
            // The AES key supplied is incorrect.
            return false;
        }
    } finally {
        lock.unlock();
    }
}
 

@Nullable
private ECKey maybeDecrypt(ECKey key) {
    if (key == null)
        return null;
    else if (key.isEncrypted()) {
        if (aesKey == null)
            throw new ECKey.KeyIsEncryptedException();
        return key.decrypt(aesKey);
    } else {
        return key;
    }
}
 

/**
 * Check whether the AES key can decrypt the first encrypted key in the wallet.
 *
 * @return true if AES key supplied can decrypt the first encrypted private key in the wallet, false otherwise.
 */
@Override
public boolean checkAESKey(KeyParameter aesKey) {
    lock.lock();
    try {
        // If no keys then cannot decrypt.
        if (hashToKeys.isEmpty()) return false;
        checkState(keyCrypter != null, "Key chain is not encrypted");

        // Find the first encrypted key in the wallet.
        ECKey first = null;
        for (ECKey key : hashToKeys.values()) {
            if (key.isEncrypted()) {
                first = key;
                break;
            }
        }
        checkState(first != null, "No encrypted keys in the wallet");

        try {
            ECKey rebornKey = first.decrypt(aesKey);
            return Arrays.equals(first.getPubKey(), rebornKey.getPubKey());
        } catch (KeyCrypterException e) {
            // The AES key supplied is incorrect.
            return false;
        }
    } finally {
        lock.unlock();
    }
}
 

@Nullable
private ECKey maybeDecrypt(ECKey key) {
    if (key == null)
        return null;
    else if (key.isEncrypted()) {
        if (aesKey == null)
            throw new ECKey.KeyIsEncryptedException();
        return key.decrypt(aesKey);
    } else {
        return key;
    }
}
 

/**
 * Check whether the AES key can decrypt the first encrypted key in the wallet.
 *
 * @return true if AES key supplied can decrypt the first encrypted private key in the wallet, false otherwise.
 */
@Override
public boolean checkAESKey(KeyParameter aesKey) {
    lock.lock();
    try {
        // If no keys then cannot decrypt.
        if (hashToKeys.isEmpty()) return false;
        checkState(keyCrypter != null, "Key chain is not encrypted");

        // Find the first encrypted key in the wallet.
        ECKey first = null;
        for (ECKey key : hashToKeys.values()) {
            if (key.isEncrypted()) {
                first = key;
                break;
            }
        }
        checkState(first != null, "No encrypted keys in the wallet");

        try {
            ECKey rebornKey = first.decrypt(aesKey);
            return Arrays.equals(first.getPubKey(), rebornKey.getPubKey());
        } catch (KeyCrypterException e) {
            // The AES key supplied is incorrect.
            return false;
        }
    } finally {
        lock.unlock();
    }
}
 

/**
 * If the key chain contains only random keys and no deterministic key chains, this method will create a chain
 * based on the oldest non-rotating private key (i.e. the seed is derived from the old wallet).
 *
 * @param keyRotationTimeSecs If non-zero, UNIX time for which keys created before this are assumed to be
 *                            compromised or weak, those keys will not be used for deterministic upgrade.
 * @param aesKey              If non-null, the encryption key the keychain is encrypted under. If the keychain is encrypted
 *                            and this is not supplied, an exception is thrown letting you know you should ask the user for
 *                            their password, turn it into a key, and then try again.
 * @return the DeterministicKeyChain that was created by the upgrade.
 * @throws java.lang.IllegalStateException      if there is already a deterministic key chain present or if there are
 *                                              no random keys (i.e. this is not an upgrade scenario), or if aesKey is
 *                                              provided but the wallet is not encrypted.
 * @throws java.lang.IllegalArgumentException   if the rotation time specified excludes all keys.
 * @throws DeterministicUpgradeRequiresPassword if the key chain group is encrypted
 *                                              and you should provide the users encryption key.
 */
public DeterministicKeyChain upgradeToDeterministic(long keyRotationTimeSecs, @Nullable KeyParameter aesKey) throws DeterministicUpgradeRequiresPassword, AllRandomKeysRotating {
    checkState(basic.numKeys() > 0);
    checkArgument(keyRotationTimeSecs >= 0);
    // Subtract one because the key rotation time might have been set to the creation time of the first known good
    // key, in which case, that's the one we want to find.
    ECKey keyToUse = basic.findOldestKeyAfter(keyRotationTimeSecs - 1);
    if (keyToUse == null)
        throw new AllRandomKeysRotating();

    if (keyToUse.isEncrypted()) {
        if (aesKey == null) {
            // We can't auto upgrade because we don't know the users password at this point. We throw an
            // exception so the calling code knows to abort the load and ask the user for their password, they can
            // then try loading the wallet again passing in the AES key.
            //
            // There are a few different approaches we could have used here, but they all suck. The most obvious
            // is to try and be as lazy as possible, running in the old random-wallet mode until the user enters
            // their password for some other reason and doing the upgrade then. But this could result in strange
            // and unexpected UI flows for the user, as well as complicating the job of wallet developers who then
            // have to support both "old" and "new" UI modes simultaneously, switching them on the fly. Given that
            // this is a one-off transition, it seems more reasonable to just ask the user for their password
            // on startup, and then the wallet app can have all the widgets for accessing seed words etc active
            // all the time.
            throw new DeterministicUpgradeRequiresPassword();
        }
        keyToUse = keyToUse.decrypt(aesKey);
    } else if (aesKey != null) {
        throw new IllegalStateException("AES Key was provided but wallet is not encrypted.");
    }

    if (chains.isEmpty()) {
        log.info("Auto-upgrading pre-HD wallet to HD!");
    } else {
        log.info("Wallet with existing HD chain is being re-upgraded due to change in key rotation time.");
    }
    log.info("Instantiating new HD chain using oldest non-rotating private key (address: {})", LegacyAddress.fromKey(params, keyToUse));
    byte[] entropy = checkNotNull(keyToUse.getSecretBytes());
    // Private keys should be at least 128 bits long.
    checkState(entropy.length >= DeterministicSeed.DEFAULT_SEED_ENTROPY_BITS / 8);
    // We reduce the entropy here to 128 bits because people like to write their seeds down on paper, and 128
    // bits should be sufficient forever unless the laws of the universe change or ECC is broken; in either case
    // we all have bigger problems.
    entropy = Arrays.copyOfRange(entropy, 0, DeterministicSeed.DEFAULT_SEED_ENTROPY_BITS / 8);    // final argument is exclusive range.
    checkState(entropy.length == DeterministicSeed.DEFAULT_SEED_ENTROPY_BITS / 8);
    String passphrase = ""; // FIXME allow non-empty passphrase
    DeterministicKeyChain chain = new DeterministicKeyChain(entropy, passphrase, keyToUse.getCreationTimeSeconds());
    if (aesKey != null) {
        chain = chain.toEncrypted(checkNotNull(basic.getKeyCrypter()), aesKey);
    }
    chains.add(chain);
    return chain;
}