org.bitcoinj.wallet

Class DeterministicSeed

java.lang.Object

org.bitcoinj.wallet.DeterministicSeed

All Implemented Interfaces:

EncryptableItem

public class DeterministicSeed
extends Object
implements EncryptableItem

Holds the seed bytes for the BIP32 deterministic wallet algorithm, inside a DeterministicKeyChain. The purpose of this wrapper is to simplify the encryption code.

Field Summary

Fields

Modifier and Type	Field and Description
static int	DEFAULT_SEED_ENTROPY_BITS
static int	MAX_SEED_ENTROPY_BITS

Constructor Summary

Constructors

Constructor and Description
DeterministicSeed(byte[] seed, List<String> mnemonic, long creationTimeSeconds)
DeterministicSeed(byte[] entropy, String passphrase, long creationTimeSeconds) Constructs a seed from a BIP 39 mnemonic code.
DeterministicSeed(EncryptedData encryptedMnemonic, EncryptedData encryptedSeed, long creationTimeSeconds)
DeterministicSeed(List<String> mnemonicCode, byte[] seed, String passphrase, long creationTimeSeconds) Constructs a seed from a BIP 39 mnemonic code.
DeterministicSeed(SecureRandom random, int bits, String passphrase, long creationTimeSeconds) Constructs a seed from a BIP 39 mnemonic code.
DeterministicSeed(String mnemonicCode, byte[] seed, String passphrase, long creationTimeSeconds)

Method Summary

Modifier and Type	Method and Description
void	check() Check if our mnemonic is a valid mnemonic phrase for our word list.
DeterministicSeed	decrypt(KeyCrypter crypter, String passphrase, org.spongycastle.crypto.params.KeyParameter aesKey)
DeterministicSeed	encrypt(KeyCrypter keyCrypter, org.spongycastle.crypto.params.KeyParameter aesKey)
boolean	equals(Object o)
long	getCreationTimeSeconds() Returns the time in seconds since the UNIX epoch at which this encryptable item was first created/derived.
EncryptedData	getEncryptedData() Returns the initialization vector and encrypted secret bytes, or null if not encrypted.
EncryptedData	getEncryptedSeedData()
Protos.Wallet.EncryptionType	getEncryptionType() Returns an enum constant describing what algorithm was used to encrypt the key or UNENCRYPTED.
List<String>	getMnemonicCode() Get the mnemonic code, or null if unknown.
byte[]	getSecretBytes() Returns the raw bytes of the item, if not encrypted, or null if encrypted or the secret is missing.
byte[]	getSeedBytes()
int	hashCode()
boolean	isEncrypted() Returns whether the item is encrypted or not.
void	setCreationTimeSeconds(long creationTimeSeconds)
String	toHexString() Returns the seed as hex or null if encrypted.
String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

DEFAULT_SEED_ENTROPY_BITS

public static final int DEFAULT_SEED_ENTROPY_BITS

See Also:

Constant Field Values

MAX_SEED_ENTROPY_BITS

public static final int MAX_SEED_ENTROPY_BITS

See Also:

Constant Field Values

Constructor Detail

DeterministicSeed

public DeterministicSeed(String mnemonicCode,
                         byte[] seed,
                         String passphrase,
                         long creationTimeSeconds)
                  throws UnreadableWalletException

Throws:

UnreadableWalletException

DeterministicSeed

public DeterministicSeed(byte[] seed,
                         List<String> mnemonic,
                         long creationTimeSeconds)

DeterministicSeed

public DeterministicSeed(EncryptedData encryptedMnemonic,
                         @Nullable
                         EncryptedData encryptedSeed,
                         long creationTimeSeconds)

DeterministicSeed

public DeterministicSeed(List<String> mnemonicCode,
                         @Nullable
                         byte[] seed,
                         String passphrase,
                         long creationTimeSeconds)

Constructs a seed from a BIP 39 mnemonic code. See MnemonicCode for more details on this scheme.

Parameters:

mnemonicCode - A list of words.

seed - The derived seed, or pass null to derive it from mnemonicCode (slow)

passphrase - A user supplied passphrase, or an empty string if there is no passphrase

creationTimeSeconds - When the seed was originally created, UNIX time.

DeterministicSeed

public DeterministicSeed(SecureRandom random,
                         int bits,
                         String passphrase,
                         long creationTimeSeconds)

Constructs a seed from a BIP 39 mnemonic code. See MnemonicCode for more details on this scheme.

Parameters:

random - Entropy source

bits - number of bits, must be divisible by 32

passphrase - A user supplied passphrase, or an empty string if there is no passphrase

creationTimeSeconds - When the seed was originally created, UNIX time.

DeterministicSeed

public DeterministicSeed(byte[] entropy,
                         String passphrase,
                         long creationTimeSeconds)

Constructs a seed from a BIP 39 mnemonic code. See MnemonicCode for more details on this scheme.

Parameters:

entropy - entropy bits, length must be divisible by 32

passphrase - A user supplied passphrase, or an empty string if there is no passphrase

creationTimeSeconds - When the seed was originally created, UNIX time.

Method Detail

isEncrypted

public boolean isEncrypted()

Description copied from interface: EncryptableItem

Returns whether the item is encrypted or not. If it is, then EncryptableItem.getSecretBytes() will return null.

Specified by:

isEncrypted in interface EncryptableItem

toString

public String toString()

Overrides:

toString in class Object

toHexString

@Nullable
public String toHexString()

Returns the seed as hex or null if encrypted.

getSecretBytes

@Nullable
public byte[] getSecretBytes()

Description copied from interface: EncryptableItem

Returns the raw bytes of the item, if not encrypted, or null if encrypted or the secret is missing.

Specified by:

getSecretBytes in interface EncryptableItem

getSeedBytes

@Nullable
public byte[] getSeedBytes()

getEncryptedData

@Nullable
public EncryptedData getEncryptedData()

Description copied from interface: EncryptableItem

Returns the initialization vector and encrypted secret bytes, or null if not encrypted.

Specified by:

getEncryptedData in interface EncryptableItem

getEncryptionType

public Protos.Wallet.EncryptionType getEncryptionType()

Description copied from interface: EncryptableItem

Returns an enum constant describing what algorithm was used to encrypt the key or UNENCRYPTED.

Specified by:

getEncryptionType in interface EncryptableItem

getEncryptedSeedData

@Nullable
public EncryptedData getEncryptedSeedData()

getCreationTimeSeconds

public long getCreationTimeSeconds()

Description copied from interface: EncryptableItem

Returns the time in seconds since the UNIX epoch at which this encryptable item was first created/derived.

Specified by:

getCreationTimeSeconds in interface EncryptableItem

setCreationTimeSeconds

public void setCreationTimeSeconds(long creationTimeSeconds)

encrypt

public DeterministicSeed encrypt(KeyCrypter keyCrypter,
                                 org.spongycastle.crypto.params.KeyParameter aesKey)

decrypt

public DeterministicSeed decrypt(KeyCrypter crypter,
                                 String passphrase,
                                 org.spongycastle.crypto.params.KeyParameter aesKey)

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

check

public void check()
           throws MnemonicException

Check if our mnemonic is a valid mnemonic phrase for our word list. Does nothing if we are encrypted.

Throws:

MnemonicException - if check fails

getMnemonicCode

@Nullable
public List<String> getMnemonicCode()

Get the mnemonic code, or null if unknown.