Package org.bitcoinj.wallet

Class BasicKeyChain

  • All Implemented Interfaces:
    EncryptableKeyChain, KeyChain
    public class BasicKeyChain
extends java.lang.Object
implements EncryptableKeyChain
    A KeyChain that implements the simplest model possible: it can have keys imported into it, and just acts as a dumb bag of keys. It will, left to its own devices, always return the same key for usage by the wallet, although it will automatically add one to itself if it's empty or if encryption is requested.

    • Constructor Detail

      • BasicKeyChain

        public BasicKeyChain()

      • BasicKeyChain

        public BasicKeyChain​(@Nullable
                     KeyCrypter crypter)

    • Method Detail

      • getKey

        public ECKey getKey​(@Nullable
                    KeyChain.KeyPurpose ignored)
        Description copied from interface: KeyChain
        Obtains a key intended for the given purpose. The chain may create a new key, derive one, or re-use an old one.
        Specified by:
        getKey in interface KeyChain

      • getKeys

        public java.util.List<ECKey> getKeys​(@Nullable
                                     KeyChain.KeyPurpose purpose,
                                     int numberOfKeys)
        Description copied from interface: KeyChain
        Obtains a number of key/s intended for the given purpose. The chain may create new key/s, derive, or re-use an old one.
        Specified by:
        getKeys in interface KeyChain

      • getKeys

        public java.util.List<ECKey> getKeys()
        Returns a copy of the list of keys that this chain is managing.

      • importKeys

        public int importKeys​(ECKey... keys)

      • importKeys

        public int importKeys​(java.util.List<? extends ECKey> keys)

      • importKey

        public void importKey​(ECKey key)
        Imports a key to the key chain. If key is present in the key chain, ignore it.

      • findKeyFromPubHash

        public ECKey findKeyFromPubHash​(byte[] pubKeyHash)

      • findKeyFromPubKey

        public ECKey findKeyFromPubKey​(byte[] pubKey)

      • hasKey

        public boolean hasKey​(ECKey key)
        Description copied from interface: KeyChain
        Returns true if the given key is in the chain.
        Specified by:
        hasKey in interface KeyChain

      • numKeys

        public int numKeys()
        Description copied from interface: KeyChain
        Returns the number of keys this key chain manages.
        Specified by:
        numKeys in interface KeyChain

      • isWatching

        public BasicKeyChain.State isWatching()
        Returns whether this chain consists of pubkey only (watching) keys, regular keys (usable for signing), or has no keys in it yet at all (thus we cannot tell).

      • removeKey

        public boolean removeKey​(ECKey key)
        Removes the given key from the keychain. Be very careful with this - losing a private key destroys the money associated with it.
        Returns:
        Whether the key was removed or not.

      • earliestKeyCreationTime

        public java.time.Instant earliestKeyCreationTime()
        Returns the earliest creation time of keys in this chain.
        Specified by:
        earliestKeyCreationTime in interface KeyChain
        Returns:
        earliest creation times of keys in this chain, Instant.EPOCH if at least one time is unknown, Instant.MAX if no keys in this chain

      • serializeToProtobuf

        public java.util.List<Protos.Key> serializeToProtobuf()
        Serialize to a list of keys
        Specified by:
        serializeToProtobuf in interface KeyChain
        Returns:
        list of keys (treat as unmodifiable list, will change in future release)

      • addEventListener

        public void addEventListener​(KeyChainEventListener listener)
        Description copied from interface: KeyChain
        Adds a listener for events that are run when keys are added, on the user thread.
        Specified by:
        addEventListener in interface KeyChain

      • addEventListener

        public void addEventListener​(KeyChainEventListener listener,
                             java.util.concurrent.Executor executor)
        Description copied from interface: KeyChain
        Adds a listener for events that are run when keys are added, on the given executor.
        Specified by:
        addEventListener in interface KeyChain

      • toEncrypted

        public BasicKeyChain toEncrypted​(java.lang.CharSequence password)
        Convenience wrapper around toEncrypted(KeyCrypter, AesKey) which uses the default Scrypt key derivation algorithm and parameters, derives a key from the given password and returns the created key.
        Specified by:
        toEncrypted in interface EncryptableKeyChain
        Returns:
        The derived key, in case you wish to cache it for future use.

      • toEncrypted

        public BasicKeyChain toEncrypted​(KeyCrypter keyCrypter,
                                 AesKey aesKey)
        Encrypt the wallet using the KeyCrypter and the AES key. A good default KeyCrypter to use is KeyCrypterScrypt.
        Specified by:
        toEncrypted in interface EncryptableKeyChain
        Parameters:
        keyCrypter - The KeyCrypter that specifies how to encrypt/ decrypt a key
        aesKey - AES key to use (normally created using KeyCrypter#deriveKey and cached as it is time consuming to create from a password)
        Throws:
        KeyCrypterException - Thrown if the wallet encryption fails. If so, the wallet state is unchanged.

      • toDecrypted

        public BasicKeyChain toDecrypted​(AesKey aesKey)
        Description copied from interface: EncryptableKeyChain
        Decrypt the key chain with the given AES key and whatever KeyCrypter is already set. Note that if you just want to spend money from an encrypted wallet, don't decrypt the whole thing first. Instead, set the SendRequest.aesKey field before asking the wallet to build the send.
        Specified by:
        toDecrypted in interface EncryptableKeyChain
        Parameters:
        aesKey - AES key to use (normally created using KeyCrypter#deriveKey and cached as it is time consuming to create from a password)

      • checkPassword

        public boolean checkPassword​(java.lang.CharSequence password)
        Returns whether the given password is correct for this key chain.
        Specified by:
        checkPassword in interface EncryptableKeyChain
        Throws:
        java.lang.IllegalStateException - if the chain is not encrypted at all.

      • checkAESKey

        public boolean checkAESKey​(AesKey aesKey)
        Check whether the AES key can decrypt the first encrypted key in the wallet.
        Specified by:
        checkAESKey in interface EncryptableKeyChain
        Returns:
        true if AES key supplied can decrypt the first encrypted private key in the wallet, false otherwise.

      • getFilter

        public BloomFilter getFilter​(int size,
                             double falsePositiveRate,
                             int tweak)
        Description copied from interface: KeyChain

        Gets a bloom filter that contains all of the public keys from this chain, and which will provide the given false-positive rate if it has size elements. Keep in mind that you will get 2 elements in the bloom filter for each key in the key chain, for the public key and the hash of the public key (address form). For this reason size should be at least 2x the result of KeyChain.numKeys().

        This is used to generate a BloomFilter which can be BloomFilter.merge(BloomFilter)d with another. It could also be used if you have a specific target for the filter's size.

        See the docs for BloomFilter(int, double, int) for a brief explanation of anonymity when using bloom filters, and for the meaning of these parameters.

        Specified by:
        getFilter in interface KeyChain

      • findOldestKeyAfter

        public java.util.Optional<ECKey> findOldestKeyAfter​(java.time.Instant time)
        Returns the first ECKey created after the given time, or empty if there is none.

      • findKeysBefore

        public java.util.List<ECKey> findKeysBefore​(java.time.Instant time)
        Returns a list of all ECKeys created after the given time.

      • toString

        public java.lang.String toString​(boolean includePrivateKeys,
                                 @Nullable
                                 AesKey aesKey,
                                 NetworkParameters params)