public void SetUp()
{
var myKey = new EcKey();
_myAddress = myKey.ToAddress(Params);
_defaultWallet = new DefaultWallet(Params);
_defaultWallet.AddKey(myKey);
_blockStore = new MemoryBlockStore(Params);
}
/// <summary>
/// Once a transaction has some inputs and outputs added, the signatures in the inputs can be calculated. The
/// signature is over the transaction itself, to prove the redeemer actually created that transaction,
/// so we have to do this step last.
/// </summary>
/// <remarks>
/// This method is similar to SignatureHash in script.cpp
/// </remarks>
/// <param name="hashType">This should always be set to SigHash.ALL currently. Other types are unused. </param>
/// <param name="defaultWallet">A wallet is required to fetch the keys needed for signing.</param>
/// <exception cref="ScriptException"/>
public void SignInputs(SigHash hashType, IDefaultWallet defaultWallet)
{
Debug.Assert(_transactionInputs.Count > 0);
Debug.Assert(_transactionOutputs.Count > 0);
// I don't currently have an easy way to test other modes work, as the official client does not use them.
Debug.Assert(hashType == SigHash.All);
// The transaction is signed with the input scripts empty except for the input we are signing. In the case
// where addInput has been used to set up a new transaction, they are already all empty. The input being signed
// has to have the connected OUTPUT program in it when the hash is calculated!
//
// Note that each input may be claiming an output sent to a different key. So we have to look at the outputs
// to figure out which key to sign with.
var signatures = new byte[_transactionInputs.Count][];
var signingKeys = new EcKey[_transactionInputs.Count];
for (var i = 0; i < _transactionInputs.Count; i++)
{
var transactionInput = _transactionInputs[i];
Debug.Assert(transactionInput.ScriptBytes.Length == 0, "Attempting to sign a non-fresh transaction");
// Set the input to the script of its output.
transactionInput.ScriptBytes = transactionInput.Outpoint.ConnectedPubKeyScript;
// Find the signing key we'll need to use.
var connectedPublicKeyHash = transactionInput.Outpoint.ConnectedPubKeyHash;
var key = defaultWallet.FindKeyFromPublicHash(connectedPublicKeyHash);
// This assert should never fire. If it does, it means the wallet is inconsistent.
Debug.Assert(key != null,
"Transaction exists in wallet that we cannot redeem: " +
Utils.BytesToHexString(connectedPublicKeyHash));
// Keep the key around for the script creation step below.
signingKeys[i] = key;
// The anyoneCanPay feature isn't used at the moment.
const bool anyoneCanPay = false;
var hash = HashTransactionForSignature(hashType, anyoneCanPay);
// Set the script to empty again for the next input.
transactionInput.ScriptBytes = TransactionInput.EmptyArray;
// Now sign for the output so we can redeem it. We use the keypair to sign the hash,
// and then put the resulting signature in the script along with the public key (below).
using (var byteOutputStream = new MemoryStream())
{
byteOutputStream.Write(key.Sign(hash));
byteOutputStream.Write((byte) (((int) hashType + 1) | (0)));
signatures[i] = byteOutputStream.ToArray();
}
}
// Now we have calculated each signature, go through and create the scripts. Reminder: the script consists of
// a signature (over a hash of the transaction) and the complete public key needed to sign for the connected
// output.
for (var i = 0; i < _transactionInputs.Count; i++)
{
var transactionInput = _transactionInputs[i];
Debug.Assert(transactionInput.ScriptBytes.Length == 0);
var signingKey = signingKeys[i];
transactionInput.ScriptBytes = Script.CreateInputScript(signatures[i], signingKey.PublicKey);
}
// Every input is now complete.
}
/// <summary>
/// Returns true if this output is to an address we have the keys for in the wallet.
/// </summary>
public bool IsMine(IDefaultWallet defaultWallet)
{
try
{
var publicKeyHash = ScriptPublicKey.PublicKeyHash;
return defaultWallet.IsPubKeyHashMine(publicKeyHash);
}
catch (ScriptException e)
{
Log.ErrorFormat("Could not parse tx output script: {0}", e);
return false;
}
}
/// <summary>
/// Calculates the sum of the outputs that are sending coins to a key in the wallet.
/// </summary>
public ulong GetValueSentToMe(IDefaultWallet defaultWallet)
{
return GetValueSentToMe(defaultWallet, true);
}
/// <summary>
/// Calculates the sum of the outputs that are sending coins to a key in the wallet. The flag controls whether to
/// include spent outputs or not.
/// </summary>
public ulong GetValueSentToMe(IDefaultWallet defaultWallet, bool includeSpent)
{
// This is tested in WalletTest.
return
_transactionOutputs.Where(transactionOutput => transactionOutput.IsMine(defaultWallet))
.Where(transactionOutput => includeSpent || transactionOutput.IsAvailableForSpending)
.Aggregate(0UL, (current, transactionOutput) => current + transactionOutput.Value);
}
/// <summary>
/// Calculates the sum of the inputs that are spending coins with keys in the wallet. This requires the
/// transactions sending coins to those keys to be in the wallet. This method will not attempt to download the
/// blocks containing the input transactions if the key is in the wallet but the transactions are not.
/// </summary>
/// <returns>Sum in nanocoins.</returns>
/// <exception cref="ScriptException"/>
public ulong GetValueSentFromMe(IDefaultWallet defaultWallet)
{
// This is tested in WalletTest.
return
_transactionInputs.Select(
transactionInput =>
(transactionInput.GetConnectedOutput(defaultWallet.Unspent) ??
transactionInput.GetConnectedOutput(defaultWallet.Spent)) ??
transactionInput.GetConnectedOutput(defaultWallet.Pending))
.Where(connected => connected != null)
.Where(connected => connected.IsMine(defaultWallet))
.Aggregate(0UL, (current, connected) => current + connected.Value);
}
/// <summary>
/// Add a wallet to the BlockChain. Note that the wallet will be unaffected by any blocks received while it
/// was not part of this BlockChain. This method is useful if the wallet has just been created, and its keys
/// have never been in use, or if the wallet has been loaded along with the BlockChain
/// </summary>
public void AddWallet(IDefaultWallet defaultWallet)
{
lock (this)
{
_wallets.Add(defaultWallet);
}
}
/// <summary>
/// Constructs a BlockChain connected to the given wallet and store. To obtain a <see cref="BitcoinSharp.Wallet.DefaultWallet" /> you can
/// construct
/// one from scratch, or you can deserialize a saved wallet from disk using <see cref="BitcoinSharp.Wallet.DefaultWallet.LoadFromFile" />.
/// </summary>
/// <remarks>
/// For the store you can use a <see cref="BitcoinSharp.Blockchain.Store.MemoryBlockStore" /> if you don't care about saving the downloaded data, or
/// a
/// <see cref="BitcoinSharp.Blockchain.Store.BoundedOverheadBlockStore" /> if you'd like to ensure fast start-up the next time you run the program.
/// </remarks>
/// <exception cref="BitcoinSharp.Blockchain.Store.BlockStoreException" />
public BlockChain(NetworkParameters networkParameters, IDefaultWallet defaultWallet, IBlockStore blockStore)
: this(networkParameters, new List<IDefaultWallet>(), blockStore)
{
if (defaultWallet != null)
AddWallet(defaultWallet);
}
