allow reencrypting key.

windows fix.

alethzero/Main.ui

@@ -159,6 +159,7 @@
     <addaction name="importKeyFile"/>
     <addaction name="claimPresale"/>
     <addaction name="exportKey"/>
+    <addaction name="reencryptKey"/>
     <addaction name="killAccount"/>
     <addaction name="separator"/>
     <addaction name="loadJS"/>
@@ -1751,6 +1752,11 @@ font-size: 14pt</string>
     <string>Import &amp;Secret Key File...</string>
    </property>
   </action>
+  <action name="reencryptKey">
+   <property name="text">
+    <string>&amp;Re-encrypt Key</string>
+   </property>
+  </action>
  </widget>
  <layoutdefault spacing="6" margin="11"/>
  <customwidgets>

alethzero/MainWin.cpp

@@ -2016,7 +2016,7 @@ void Main::on_killAccount_triggered()
 {
 	if (ui->ourAccounts->currentRow() >= 0)
 	{
-		auto hba = ui->accounts->currentItem()->data(Qt::UserRole).toByteArray();
+		auto hba = ui->ourAccounts->currentItem()->data(Qt::UserRole).toByteArray();
 		Address h((byte const*)hba.data(), Address::ConstructFromPointer);
 		auto k = m_keyManager.accountDetails()[h];
 		if (
@@ -2036,6 +2036,20 @@ void Main::on_killAccount_triggered()
 	}
 }
 
+void Main::on_reencryptKey_triggered()
+{
+	if (ui->ourAccounts->currentRow() >= 0)
+	{
+		auto hba = ui->ourAccounts->currentItem()->data(Qt::UserRole).toByteArray();
+		Address a((byte const*)hba.data(), Address::ConstructFromPointer);
+		QStringList kdfs = {"PBKDF2-SHA256", "Scrypt"};
+		QString kdf = QInputDialog::getItem(this, "Re-Encrypt Key", "Select a key derivation function to use for storing your key:", kdfs);
+		m_keyManager.reencode(a, [&](){
+			return QInputDialog::getText(nullptr, "Re-Encrypt Key", "Enter the password for this key to re-encrypt it.", QLineEdit::Password, QString()).toStdString();
+		}, (KDF)kdfs.indexOf(kdf));
+	}
+}
+
 void Main::on_go_triggered()
 {
 	if (!ui->net->isChecked())

alethzero/MainWin.h

@@ -137,6 +137,7 @@ private slots:
 	void on_newAccount_triggered();
 	void on_killAccount_triggered();
 	void on_importKey_triggered();
+	void on_reencryptKey_triggered();
 	void on_importKeyFile_triggered();
 	void on_claimPresale_triggered();
 	void on_exportKey_triggered();

libdevcrypto/SecretStore.cpp

@@ -169,14 +169,40 @@ h128 SecretStore::readKey(std::string const& _file, bool _deleteFile)
 	return h128();
 }
 
-std::string SecretStore::encrypt(bytes const& _v, std::string const& _pass)
+void SecretStore::recode(h128 const& _uuid, string const& _pass, KDF _kdf)
+{
+	m_keys[_uuid].first = encrypt(secret(_uuid, [&](){ return _pass; }), _pass, _kdf);
+	save();
+}
+
+std::string SecretStore::encrypt(bytes const& _v, std::string const& _pass, KDF _kdf)
 {
 	js::mObject ret;
 
 	// KDF info
 	unsigned dklen = 16;
-	unsigned iterations = 262144;
 	bytes salt = h256::random().asBytes();
+	bytes derivedKey;
+	if (_kdf == KDF::Scrypt)
+	{
+		unsigned iterations = 262144;
+		unsigned p = 262144;
+		unsigned r = 262144;
+		ret["kdf"] = "scrypt";
+		{
+			js::mObject params;
+			params["n"] = (int)iterations;
+			params["p"] = 1;
+			params["r"] = 8;
+			params["dklen"] = (int)dklen;
+			params["salt"] = toHex(salt);
+			ret["kdfparams"] = params;
+		}
+		derivedKey = scrypt(_pass, salt, iterations, p, r, dklen);
+	}
+	else
+	{
+		unsigned iterations = 262144;
 		ret["kdf"] = "pbkdf2";
 		{
 			js::mObject params;
@@ -186,7 +212,8 @@ std::string SecretStore::encrypt(bytes const& _v, std::string const& _pass)
 			params["dklen"] = (int)dklen;
 			ret["kdfparams"] = params;
 		}
-	bytes derivedKey = pbkdf2(_pass, salt, iterations, dklen);
+		derivedKey = pbkdf2(_pass, salt, iterations, dklen);
+	}
 
 	// cipher info
 	ret["cipher"] = "aes-128-cbc";

libdevcrypto/SecretStore.h

@@ -30,6 +30,11 @@
 namespace dev
 {
 
+enum class KDF {
+	PBKDF2_SHA256,
+	Scrypt,
+};
+
 class SecretStore
 {
 public:
@@ -39,6 +44,7 @@ public:
 	bytes secret(h128 const& _uuid, std::function<std::string()> const& _pass, bool _useCache = true) const;
 	h128 importKey(std::string const& _file) { auto ret = readKey(_file, false); if (ret) save(); return ret; }
 	h128 importSecret(bytes const& _s, std::string const& _pass);
+	void recode(h128 const& _uuid, std::string const& _pass, KDF _kdf = KDF::Scrypt);
 	void kill(h128 const& _uuid);
 
 	// Clear any cached keys.
@@ -47,7 +53,7 @@ public:
 private:
 	void save(std::string const& _keysPath = getDataDir("web3") + "/keys");
 	void load(std::string const& _keysPath = getDataDir("web3") + "/keys");
-	static std::string encrypt(bytes const& _v, std::string const& _pass);
+	static std::string encrypt(bytes const& _v, std::string const& _pass, KDF _kdf = KDF::Scrypt);
 	static bytes decrypt(std::string const& _v, std::string const& _pass);
 	h128 readKey(std::string const& _file, bool _deleteFile);
 

libethereum/KeyManager.cpp

@@ -49,6 +49,12 @@ void KeyManager::create(std::string const& _pass)
 	write(_pass, m_keysFile);
 }
 
+void KeyManager::reencode(Address const& _address, std::function<string()> const& _pass, KDF _kdf)
+{
+	h128 u = uuid(_address);
+	store().recode(u, getPassword(u, _pass), _kdf);
+}
+
 bool KeyManager::load(std::string const& _pass)
 {
 	try {
@@ -89,7 +95,11 @@ Secret KeyManager::secret(Address const& _address, function<std::string()> const
 
 Secret KeyManager::secret(h128 const& _uuid, function<std::string()> const& _pass) const
 {
-	return Secret(m_store.secret(_uuid, [&](){
+	return Secret(m_store.secret(_uuid, [&](){ return getPassword(_uuid, _pass); }));
+}
+
+std::string KeyManager::getPassword(h128 const& _uuid, function<std::string()> const& _pass) const
+{
 	auto kit = m_keyInfo.find(_uuid);
 	if (kit != m_keyInfo.end())
 	{
@@ -100,7 +110,6 @@ Secret KeyManager::secret(h128 const& _uuid, function<std::string()> const& _pas
 	std::string p = _pass();
 	m_cachedPasswords[hashPassword(p)] = p;
 	return p;
-	}));
 }
 
 h128 KeyManager::uuid(Address const& _a) const

libethereum/KeyManager.h

@@ -84,10 +84,13 @@ public:
 	Secret secret(Address const& _address, std::function<std::string()> const& _pass = DontKnowThrow) const;
 	Secret secret(h128 const& _uuid, std::function<std::string()> const& _pass = DontKnowThrow) const;
 
+	void reencode(Address const& _address, std::function<std::string()> const& _pass = DontKnowThrow, KDF _kdf = KDF::Scrypt);
+
 	void kill(h128 const& _id) { kill(address(_id)); }
 	void kill(Address const& _a);
 
 private:
+	std::string getPassword(h128 const& _uuid, std::function<std::string()> const& _pass = DontKnowThrow) const;
 	std::string defaultPassword() const { return asString(m_key.ref()); }
 	h256 hashPassword(std::string const& _pass) const;
 

libscrypt/crypto-mcf.c

@@ -7,7 +7,7 @@
 #include <math.h>
 
 #ifndef S_SPLINT_S /* Including this here triggers a known bug in splint */
-#include <unistd.h>
+//#include <unistd.h>
 #endif
 
 #include "libscrypt.h"