KeyAux.h

#pragma once

/*
	This file is part of cpp-ethereum.

	cpp-ethereum is free software: you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation, either version 3 of the License, or
	(at your option) any later version.

	cpp-ethereum is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with cpp-ethereum.  If not, see <http://www.gnu.org/licenses/>.
*/
/** @file KeyAux.cpp
 * @author Gav Wood <i@gavwood.com>
 * @date 2014
 * CLI module for key management.
 */

#include <thread>
#include <chrono>
#include <fstream>
#include <iosfwd>
#include <boost/algorithm/string.hpp>
#include <boost/algorithm/string/trim_all.hpp>
#include <libdevcore/SHA3.h>
#include <libdevcore/FileSystem.h>
#include <libethcore/KeyManager.h>
#include <libethcore/TransactionBase.h>

using namespace std;
using namespace dev;
using namespace dev::eth;
using namespace boost::algorithm;

class BadArgument: public Exception {};

string createPassword(std::string const& _prompt)
{
	string ret;
	while (true)
	{
		ret = getPassword(_prompt);
		string confirm = getPassword("Please confirm the passphrase by entering it again: ");
		if (ret == confirm)
			break;
		cout << "Passwords were different. Try again." << endl;
	}
	return ret;
//	cout << "Enter a hint to help you remember this passphrase: " << flush;
//	cin >> hint;
//	return make_pair(ret, hint);
}

pair<string, string> createPassword(KeyManager& _keyManager, std::string const& _prompt, std::string const& _pass = std::string(), std::string const& _hint = std::string())
{
	string pass = _pass;
	if (pass.empty())
		while (true)
		{
			pass = getPassword(_prompt);
			string confirm = getPassword("Please confirm the passphrase by entering it again: ");
			if (pass == confirm)
				break;
			cout << "Passwords were different. Try again." << endl;
		}
	string hint = _hint;
	if (hint.empty() && !pass.empty() && !_keyManager.haveHint(pass))
	{
		cout << "Enter a hint to help you remember this passphrase: " << flush;
		getline(cin, hint);
	}
	return make_pair(pass, hint);
}

class KeyCLI
{
public:
	enum class OperationMode
	{
		None,
		ListBare,
		NewBare,
		ImportBare,
		ExportBare,
		RecodeBare,
		KillBare,
		InspectBare,
		CreateWallet,
		List,
		New,
		Import,
		ImportWithAddress,
		ImportPresale,
		Export,
		Recode,
		Kill,
		Inspect,
		SignTx,
		DecodeTx,
	};

	KeyCLI(OperationMode _mode = OperationMode::None): m_mode(_mode) {}

	bool interpretOption(size_t& i, vector<string> const& argv)
	{
		size_t argc = argv.size();
		string arg = argv[i];
		if (arg == "--wallet-path" && i + 1 < argc)
			m_walletPath = argv[++i];
		else if (arg == "--secrets-path" && i + 1 < argc)
			m_secretsPath = argv[++i];
		else if ((arg == "-m" || arg == "--master") && i + 1 < argc)
			m_masterPassword = argv[++i];
		else if (arg == "--unlock" && i + 1 < argc)
			m_unlocks.push_back(argv[++i]);
		else if (arg == "--lock" && i + 1 < argc)
			m_lock = argv[++i];
		else if (arg == "--kdf" && i + 1 < argc)
			m_kdf = argv[++i];
		else if (arg == "--kdf-param" && i + 2 < argc)
		{
			auto n = argv[++i];
			auto v = argv[++i];
			m_kdfParams[n] = v;
		}
		else if (arg == "newbare")
			m_mode = OperationMode::NewBare;
		else if (arg == "inspect")
			m_mode = OperationMode::Inspect;
		else if ((arg == "-s" || arg == "--sign-tx" || arg == "sign") && i + 1 < argc)
		{
			m_mode = OperationMode::SignTx;
			m_signKey = argv[++i];
		}
		else if (arg == "--show-me-the-secret")
			m_showSecret = true;
		else if (arg == "--tx-data" && i + 1 < argc)
			try
			{
				m_toSign.data = fromHex(argv[++i]);
			}
			catch (...)
			{
				cerr << "Invalid argument to " << arg << endl;
				exit(-1);
			}
		else if (arg == "--tx-nonce" && i + 1 < argc)
			try
			{
				m_toSign.nonce = u256(argv[++i]);
			}
			catch (...)
			{
				cerr << "Invalid argument to " << arg << endl;
				exit(-1);
			}
		else if (arg == "--force-nonce" && i + 1 < argc)
			try
			{
				m_forceNonce = u256(argv[++i]);
			}
			catch (...)
			{
				cerr << "Invalid argument to " << arg << endl;
				exit(-1);
			}
		else if ((arg == "--tx-dest" || arg == "--tx-to" || arg == "--tx-destination") && i + 1 < argc)
			try
			{
				m_toSign.creation = false;
				m_toSign.to = toAddress(argv[++i]);
			}
			catch (...)
			{
				cerr << "Invalid argument to " << arg << endl;
				exit(-1);
			}
		else if (arg == "--tx-gas" && i + 1 < argc)
			try
			{
				m_toSign.gas = u256(argv[++i]);
			}
			catch (...)
			{
				cerr << "Invalid argument to " << arg << endl;
				exit(-1);
			}
		else if (arg == "--tx-gasprice" && i + 1 < argc)
			try
			{
				m_toSign.gasPrice = u256(argv[++i]);
			}
			catch (...)
			{
				cerr << "Invalid argument to " << arg << endl;
				exit(-1);
			}
		else if (arg == "--tx-value" && i + 1 < argc)
			try
			{
				m_toSign.value = u256(argv[++i]);
			}
			catch (...)
			{
				cerr << "Invalid argument to " << arg << endl;
				exit(-1);
			}
		else if (arg == "--decode-tx" || arg == "decode")
			m_mode = OperationMode::DecodeTx;
		else if (arg == "--import-bare" || arg == "importbare")
			m_mode = OperationMode::ImportBare;
		else if (arg == "--list-bare" || arg == "listbare")
			m_mode = OperationMode::ListBare;
		else if (arg == "--export-bare" || arg == "exportbare")
			m_mode = OperationMode::ExportBare;
		else if (arg == "--inspect-bare" || arg == "inspectbare")
			m_mode = OperationMode::InspectBare;
		else if (arg == "--recode-bare" || arg == "recodebare")
			m_mode = OperationMode::RecodeBare;
		else if (arg == "--kill-bare" || arg == "killbare")
			m_mode = OperationMode::KillBare;
		else if (arg == "--create-wallet" || arg == "createwallet")
			m_mode = OperationMode::CreateWallet;
		else if (arg == "-l" || arg == "--list" || arg == "list")
			m_mode = OperationMode::List;
		else if ((arg == "-n" || arg == "--new" || arg == "new") && i + 1 < argc)
		{
			m_mode = OperationMode::New;
			m_name = argv[++i];
		}
		else if ((arg == "-i" || arg == "--import" || arg == "import") && i + 2 < argc)
		{
			m_mode = OperationMode::Import;
			m_inputs = strings(1, argv[++i]);
			m_name = argv[++i];
		}
		else if ((arg == "--import-presale" || arg == "importpresale") && i + 2 < argc)
		{
			m_mode = OperationMode::ImportPresale;
			m_inputs = strings(1, argv[++i]);
			m_name = argv[++i];
		}
		else if ((arg == "--import-with-address" || arg == "importwithaddress") && i + 3 < argc)
		{
			m_mode = OperationMode::ImportWithAddress;
			m_inputs = strings(1, argv[++i]);
			m_address = Address(argv[++i]);
			m_name = argv[++i];
		}
		else if (arg == "--export" || arg == "export")
			m_mode = OperationMode::Export;
		else if (arg == "--recode" || arg == "recode")
			m_mode = OperationMode::Recode;
		else if (arg == "kill")
			m_mode = OperationMode::Kill;
		else if (arg == "--no-icap")
			m_icap = false;
		else if (m_mode == OperationMode::DecodeTx || m_mode == OperationMode::Inspect || m_mode == OperationMode::Kill || m_mode == OperationMode::SignTx || m_mode == OperationMode::ImportBare || m_mode == OperationMode::InspectBare || m_mode == OperationMode::KillBare || m_mode == OperationMode::Recode || m_mode == OperationMode::Export || m_mode == OperationMode::RecodeBare || m_mode == OperationMode::ExportBare)
			m_inputs.push_back(arg);
		else
			return false;
		return true;
	}

	KeyPair makeKey() const
	{
		KeyPair k(Secret::random());
		while (m_icap && k.address()[0])
			k = KeyPair(Secret(sha3(k.secret().ref())));
		return k;
	}

	Secret getSecret(std::string const& _signKey)
	{
		string json = contentsString(_signKey);
		if (!json.empty())
			return Secret(secretStore().secret(secretStore().readKeyContent(json), [&](){ return getPassword("Enter passphrase for key: "); }));
		else
		{
			if (h128 u = fromUUID(_signKey))
				return Secret(secretStore().secret(u, [&](){ return getPassword("Enter passphrase for key: "); }));
			Address a;
			try
			{
				a = toAddress(_signKey);
			}
			catch (...)
			{
				for (Address const& aa: keyManager().accounts())
					if (keyManager().accountName(aa) == _signKey)
					{
						a = aa;
						break;
					}
			}
			if (a)
				return keyManager().secret(a, [&](){ return getPassword("Enter passphrase for key (hint:" + keyManager().passwordHint(a) + "): "); });
			cerr << "Bad file, UUID or address: " << _signKey << endl;
			exit(-1);
		}
	}

	void execute()
	{
		switch (m_mode)
		{
		case OperationMode::CreateWallet:
		{
			KeyManager wallet(m_walletPath, m_secretsPath);
			if (m_masterPassword.empty())
				m_masterPassword = createPassword("Please enter a MASTER passphrase to protect your key store (make it strong!): ");
			try
			{
				wallet.create(m_masterPassword);
			}
			catch (Exception const& _e)
			{
				cerr << "unable to create wallet" << endl << boost::diagnostic_information(_e);
			}
			break;
		}
		case OperationMode::DecodeTx:
		{
			try
			{
				TransactionBase t = m_inputs.empty() ? TransactionBase(m_toSign) : TransactionBase(inputData(m_inputs[0]), CheckTransaction::None);
				cout << "Transaction " << t.sha3().hex() << endl;
				if (t.isCreation())
				{
					cout << "  type: creation" << endl;
					cout << "  code: " << toHex(t.data()) << endl;
				}
				else
				{
					cout << "  type: message" << endl;
					cout << "  to: " << t.to() << endl;
					cout << "  data: " << (t.data().empty() ? "none" : toHex(t.data())) << endl;
				}
				try
				{
					auto s = t.sender();
					if (t.isCreation())
						cout << "  creates: " << toAddress(s, t.nonce()) << endl;
					cout << "  from: " << s << endl;
				}
				catch (...)
				{
					cout << "  from: <unsigned>" << endl;
				}
				cout << "  value: " << formatBalance(t.value()) << " (" << t.value() << " wei)" << endl;
				cout << "  nonce: " << t.nonce() << endl;
				cout << "  gas: " << t.gas() << endl;
				cout << "  gas price: " << formatBalance(t.gasPrice()) << " (" << t.gasPrice() << " wei)" << endl;
				cout << "  signing hash: " << t.sha3(WithoutSignature).hex() << endl;
				if (t.safeSender())
				{
					cout << "  v: " << (int)t.signature().v << endl;
					cout << "  r: " << t.signature().r << endl;
					cout << "  s: " << t.signature().s << endl;
				}
			}
			catch (Exception& ex)
			{
				cerr << "Invalid transaction: " << ex.what() << endl;
			}
			break;
		}
		case OperationMode::SignTx:
		{
			Secret s = getSecret(m_signKey);
			if (m_inputs.empty())
				m_inputs.push_back(string());
			for (string const& i: m_inputs)
			{
				bool isFile = false;
				try
				{
					TransactionBase t = i.empty() ? TransactionBase(m_toSign) : TransactionBase(inputData(i, &isFile), CheckTransaction::None);
					if (m_forceNonce)
						t.setNonce(m_forceNonce);
					t.sign(s);
					cout << t.sha3() << ": ";
					if (isFile)
					{
						writeFile(i + ".signed", toHex(t.rlp()));
						cout << i + ".signed" << endl;
					}
					else
						cout << toHex(t.rlp()) << endl;
				}
				catch (Exception& ex)
				{
					cerr << "Invalid transaction: " << ex.what() << endl;
				}
			}
			break;
		}
		case OperationMode::Inspect:
		{
			keyManager(true);
			for (auto i: m_inputs)
			{
				Address a = userToAddress(i);
				if (!keyManager().accountName(a).empty())
					cout << keyManager().accountName(a) << " (" << a.abridged() << ")" << endl;
				else
					cout << a.abridged() << endl;
				cout << "  Address: " << a.hex() << endl;
				if (m_showSecret)
				{
					Secret s = keyManager(true).secret(a);
					cout << "  Secret: " << (m_showSecret ? toHex(s.ref()) : (toHex(s.ref().cropped(0, 8)) + "...")) << endl;
				}
			}
			break;
		}
		case OperationMode::ListBare:
			if (secretStore().keys().empty())
				cout << "No keys found." << endl;
			else
				for (h128 const& u: std::set<h128>() + secretStore().keys())
					cout << toUUID(u) << endl;
			break;
		case OperationMode::NewBare:
		{
			if (m_lock.empty())
				m_lock = createPassword("Enter a passphrase with which to secure this account: ");
			auto k = makeKey();
			h128 u = secretStore().importSecret(k.secret().ref(), m_lock);
			cout << "Created key " << toUUID(u) << endl;
			cout << "  Address: " << k.address().hex() << endl;
			break;
		}
		case OperationMode::ImportBare:
			for (string const& input: m_inputs)
			{
				h128 u;
				bytesSec b;
				b.writable() = fromHex(input);
				if (b.size() != 32)
				{
					std::string s = contentsString(input);
					b.writable() = fromHex(s);
					if (b.size() != 32)
						u = secretStore().importKey(input);
				}
				if (!u && b.size() == 32)
					u = secretStore().importSecret(b, lockPassword(toAddress(Secret(b)).abridged()));
				if (!u)
				{
					cerr << "Cannot import " << input << " not a file or secret." << endl;
					continue;
				}
				cout << "Successfully imported " << input << " as " << toUUID(u);
			}
			break;
		case OperationMode::InspectBare:
			for (auto const& i: m_inputs)
				if (!contents(i).empty())
				{
					h128 u = secretStore().readKey(i, false);
					bytesSec s = secretStore().secret(u, [&](){ return getPassword("Enter passphrase for key " + i + ": "); });
					cout << "Key " << i << ":" << endl;
					cout << "  UUID: " << toUUID(u) << ":" << endl;
					cout << "  Address: " << toAddress(Secret(s)).hex() << endl;
					cout << "  Secret: " << (m_showSecret ? toHex(s.ref()) : (toHex(s.ref().cropped(0, 8)) + "...")) << endl;
				}
				else if (h128 u = fromUUID(i))
				{
					bytesSec s = secretStore().secret(u, [&](){ return getPassword("Enter passphrase for key " + toUUID(u) + ": "); });
					cout << "Key " << i << ":" << endl;
					cout << "  Address: " << toAddress(Secret(s)).hex() << endl;
					cout << "  Secret: " << (m_showSecret ? toHex(s.ref()) : (toHex(s.ref().cropped(0, 8)) + "...")) << endl;
				}
				else if (Address a = toAddress(i))
				{
					cout << "Key " << a.abridged() << ":" << endl;
					cout << "  Address: " << a.hex() << endl;
				}
				else
					cerr << "Couldn't inspect " << i << "; not found." << endl;
			break;
		case OperationMode::ExportBare: break;
		case OperationMode::RecodeBare:
			for (auto const& i: m_inputs)
				if (h128 u = fromUUID(i))
					if (secretStore().recode(u, lockPassword(toUUID(u)), [&](){ return getPassword("Enter passphrase for key " + toUUID(u) + ": "); }, kdf()))
						cerr << "Re-encoded " << toUUID(u) << endl;
					else
						cerr << "Couldn't re-encode " << toUUID(u) << "; key corrupt or incorrect passphrase supplied." << endl;
				else
					cerr << "Couldn't re-encode " << i << "; not found." << endl;
			break;
		case OperationMode::KillBare:
			for (auto const& i: m_inputs)
				if (h128 u = fromUUID(i))
					secretStore().kill(u);
				else
					cerr << "Couldn't kill " << i << "; not found." << endl;
			break;
		case OperationMode::New:
		{
			keyManager();
			tie(m_lock, m_lockHint) = createPassword(keyManager(), "Enter a passphrase with which to secure this account (or nothing to use the master passphrase): ", m_lock, m_lockHint);
			auto k = makeKey();
			bool usesMaster = m_lock.empty();
			h128 u = usesMaster ? keyManager().import(k.secret(), m_name) : keyManager().import(k.secret(), m_name, m_lock, m_lockHint);
			cout << "Created key " << toUUID(u) << endl;
			cout << "  Name: " << m_name << endl;
			if (usesMaster)
				cout << "  Uses master passphrase." << endl;
			else
				cout << "  Password hint: " << m_lockHint << endl;
			cout << "  Address: " << k.address().hex() << endl;
			break;
		}
		case OperationMode::Import:
		{
			if (m_inputs.size() != 1)
			{
				cerr << "Error: exactly one key must be given to import." << endl;
				break;
			}

			h128 u = keyManager().store().importKey(m_inputs[0]);
			string pw;
			bytesSec s = keyManager().store().secret(u, [&](){ return (pw = getPassword("Enter the passphrase for the key: ")); });
			if (s.size() != 32)
			{
				cerr << "Error: couldn't decode key or invalid secret size." << endl;
				break;
			}

			bool usesMaster = true;
			if (pw != m_masterPassword && m_lockHint.empty())
			{
				cout << "Enter a hint to help you remember the key's passphrase: " << flush;
				getline(cin, m_lockHint);
				usesMaster = false;
			}
			keyManager().importExisting(u, m_name, pw, m_lockHint);
			auto a = keyManager().address(u);

			cout << "Imported key " << toUUID(u) << endl;
			cout << "  Name: " << m_name << endl;
			if (usesMaster)
				cout << "  Uses master passphrase." << endl;
			else
				cout << "  Password hint: " << m_lockHint << endl;
			cout << "  Address: " << a.hex() << endl;
			break;
		}
		case OperationMode::ImportWithAddress:
		{
			if (m_inputs.size() != 1)
			{
				cerr << "Error: exactly one key must be given to import." << endl;
				break;
			}
			keyManager();
			string const& i = m_inputs[0];
			h128 u;
			bytesSec b;
			b.writable() = fromHex(i);
			if (b.size() != 32)
			{
				std::string s = contentsString(i);
				b.writable() = fromHex(s);
				if (b.size() != 32)
					u = keyManager().store().importKey(i);
			}
			if (!u && b.size() == 32)
				u = keyManager().store().importSecret(b, lockPassword(toAddress(Secret(b)).abridged()));
			if (!u)
			{
				cerr << "Cannot import " << i << " not a file or secret." << endl;
				break;
			}
			keyManager().importExisting(u, m_name, m_address);
			cout << "Successfully imported " << i << ":" << endl;
			cout << "  Name: " << m_name << endl;
			cout << "  UUID: " << toUUID(u) << endl;
			cout << "  Address: " << m_address << endl;
			break;
		}
		case OperationMode::ImportPresale:
		{
			keyManager();
			std::string pw;
			KeyPair k = keyManager().presaleSecret(contentsString(m_inputs[0]), [&](bool){ return (pw = getPassword("Enter the passphrase for the presale key: ")); });
			keyManager().import(k.secret(), m_name, pw, "Same passphrase as used for presale key");
			break;
		}
		case OperationMode::Recode:
			for (auto const& i: m_inputs)
				if (Address a = userToAddress(i))
				{
					string pw;
					Secret s = keyManager().secret(a, [&](){ return pw = getPassword("Enter old passphrase for key '" + i + "' (hint: " + keyManager().passwordHint(a) + "): "); });
					if (!s)
					{
						cerr << "Invalid password for address " << a << endl;
						continue;
					}
					pair<string, string> np = createPassword(keyManager(), "Enter new passphrase for key '" + i + "': ");
					if (keyManager().recode(a, np.first, np.second, [&](){ return pw; }, kdf()))
						cout << "Re-encoded key '" << i << "' successfully." << endl;
					else
						cerr << "Couldn't re-encode '" << i << "''; key corrupt or incorrect passphrase supplied." << endl;
				}
				else
					cerr << "Couldn't re-encode " << i << "; not found." << endl;
			break;
		case OperationMode::Kill:
		{
			unsigned count = 0;
			for (auto const& i: m_inputs)
			{
				if (Address a = userToAddress(i))
					keyManager().kill(a);
				else
					cerr << "Couldn't kill " << i << "; not found." << endl;
				++count;
			}
			cout << count << " key(s) deleted." << endl;
			break;
		}
		case OperationMode::List:
		{
			if (keyManager().store().keys().empty())
			{
				cout << "No keys found." << endl;
				break;
			}

			vector<u128> bare;
			AddressHash got;
			for (auto const& u: keyManager().store().keys())
				if (Address a = keyManager().address(u))
				{
					got.insert(a);
					cout << toUUID(u) << " " << a.abridged();
					cout << " " << a << " ";
					cout << " " << keyManager().accountName(a) << endl;
				}
				else
					bare.push_back(u);
			for (auto const& u: bare)
				cout << toUUID(u) << " (Bare)" << endl;
			break;
		}
		default: break;
		}
	}

	std::string lockPassword(std::string const& _accountName)
	{
		return m_lock.empty() ? createPassword("Enter a passphrase with which to secure account " + _accountName + ": ") : m_lock;
	}

	static void streamHelp(ostream& _out)
	{
		_out
			<< "Secret-store (\"bare\") operation modes:" << endl
			<< "    listbare  List all secret available in secret-store." << endl
			<< "    newbare  Generate and output a key without interacting with wallet and dump the JSON." << endl
			<< "    importbare [ <file>|<secret-hex> , ... ] Import keys from given sources." << endl
			<< "    recodebare [ <uuid>|<file> , ... ]  Decrypt and re-encrypt given keys." << endl
			<< "    inspectbare [ <uuid>|<file> , ... ]  Output information on given keys." << endl
//			<< "    exportbare [ <uuid> , ... ]  Export given keys." << endl
			<< "    killbare [ <uuid> , ... ]  Delete given keys." << endl
			<< "Secret-store configuration:" << endl
			<< "    --secrets-path <path>  Specify Web3 secret-store path (default: " << SecretStore::defaultPath() << ")" << endl
			<< endl
			<< "Wallet operating modes:" << endl
			<< "    createwallet  Create an Ethereum master wallet." << endl
			<< "    list  List all keys available in wallet." << endl
			<< "    new <name>  Create a new key with given name and add it in the wallet." << endl
			<< "    import [<uuid>|<file>|<secret-hex>] <name>  Import keys from given source and place in wallet." << endl
			<< "    importpresale <file> <name>  Import a presale wallet into a key with the given name." << endl
			<< "    importwithaddress [<uuid>|<file>|<secret-hex>] <address> <name>  Import keys from given source with given address and place in wallet." << endl
			<< "    export [ <address>|<uuid> , ... ]  Export given keys." << endl
			<< "    inspect [ <address>|<name>|<uuid> ] ...  Print information on the given keys." << endl
//			<< "    recode [ <address>|<uuid>|<file> , ... ]  Decrypt and re-encrypt given keys." << endl
			<< "    kill [ <address>|<uuid>, ... ]  Delete given keys." << endl
			<< "Wallet configuration:" << endl
			<< "    --wallet-path <path>  Specify Ethereum wallet path (default: " << KeyManager::defaultPath() << ")" << endl
			<< "    -m, --master <passphrase>  Specify wallet (master) passphrase." << endl
			<< endl
			<< "Transaction operating modes:" << endl
			<< "    decode ( [ <hex>|<file> ] )  Decode given transaction." << endl
			<< "    sign [ <address>|<uuid>|<file> ] ( [ <hex>|<file> , ... ] )  (Re-)Sign given transaction." << endl
			<< "Transaction specification options (to be used when no transaction hex or file is given):" << endl
			<< "    --tx-dest <address>  Specify the destination address for the transaction to be signed." << endl
			<< "    --tx-data <hex>  Specify the hex data for the transaction to be signed." << endl
			<< "    --tx-nonce <n>  Specify the nonce for the transaction to be signed." << endl
			<< "    --tx-gas <n>  Specify the gas for the transaction to be signed." << endl
			<< "    --tx-gasprice <wei>  Specify the gas price for the transaction to be signed." << endl
			<< "    --tx-value <wei>  Specify the value for the transaction to be signed." << endl
			<< "Transaction signing options:" << endl
			<< "    --force-nonce <n>  Override the nonce for any transactions to be signed." << endl
			<< endl
			<< "Encryption configuration:" << endl
			<< "    --kdf <kdfname>  Specify KDF to use when encrypting (default: sc	rypt)" << endl
			<< "    --kdf-param <name> <value>  Specify a parameter for the KDF." << endl
//			<< "    --cipher <ciphername>  Specify cipher to use when encrypting (default: aes-128-ctr)" << endl
//			<< "    --cipher-param <name> <value>  Specify a parameter for the cipher." << endl
			<< "    --lock <passphrase>  Specify passphrase for when encrypting a (the) key." << endl
			<< "    --hint <hint>  Specify hint for the --lock passphrase." << endl
			<< endl
			<< "Decryption configuration:" << endl
			<< "    --unlock <passphrase>  Specify passphrase for a (the) key." << endl
			<< "Key generation configuration:" << endl
			<< "    --no-icap  Don't bother to make a direct-ICAP capable key." << endl
			;
	}

	static bytes inputData(std::string const& _input, bool* _isFile = nullptr)
	{
		bytes b = fromHex(_input);
		if (_isFile)
			*_isFile = false;
		if (b.empty())
		{
			if (_isFile)
				*_isFile = true;
			std::string s = boost::trim_copy_if(contentsString(_input), is_any_of(" \t\n"));
			b = fromHex(s);
			if (b.empty())
				b = asBytes(s);
		}
		return b;
	}

private:
	void openWallet(KeyManager& _w)
	{
		while (true)
		{
			if (_w.load(m_masterPassword))
				break;
			if (!m_masterPassword.empty())
			{
				cout << "Password invalid. Try again." << endl;
				m_masterPassword.clear();
			}
			m_masterPassword = getPassword("Please enter your MASTER passphrase: ");
		}
	}

	KDF kdf() const { return m_kdf == "pbkdf2" ? KDF::PBKDF2_SHA256 : KDF::Scrypt; }

	Address userToAddress(std::string const& _s)
	{
		if (h128 u = fromUUID(_s))
			return keyManager().address(u);
		DEV_IGNORE_EXCEPTIONS(return toAddress(_s));
		for (Address const& a: keyManager().accounts())
			if (keyManager().accountName(a) == _s)
				return a;
		return Address();
	}

	KeyManager& keyManager(bool walletLess=false)
	{
		if (!m_keyManager)
		{
			m_keyManager.reset(new KeyManager(m_walletPath, m_secretsPath));
			if (m_keyManager->exists())
				openWallet(*m_keyManager);
			else if( !walletLess )
			{
				cerr << "Couldn't open wallet. Does it exist?" << endl;
				exit(-1);
			}
		}
		return *m_keyManager;
	}

	SecretStore& secretStore()
	{
		if (m_keyManager)
			return m_keyManager->store();
		if (!m_secretStore)
			m_secretStore.reset(new SecretStore(m_secretsPath));
		return *m_secretStore;
	}

	/// Where the keys are.
	unique_ptr<SecretStore> m_secretStore;
	unique_ptr<KeyManager> m_keyManager;

	/// Operating mode.
	OperationMode m_mode;

	/// Wallet stuff
	boost::filesystem::path m_secretsPath = SecretStore::defaultPath();
	boost::filesystem::path m_walletPath = KeyManager::defaultPath();

	/// Wallet passphrase stuff
	string m_masterPassword;
	strings m_unlocks;
	string m_lock;
	string m_lockHint;
	bool m_icap = true;

	/// Creating/importing
	string m_name;
	Address m_address;

	/// Inspecting
	bool m_showSecret = false;

	/// Importing
	strings m_inputs;

	/// Signing
	string m_signKey;
	TransactionSkeleton m_toSign;
	u256 m_forceNonce;

	string m_kdf = "scrypt";
	map<string, string> m_kdfParams;
};