store secret keys encrypted where possible

The secret spend key is kept encrypted in memory, and
decrypted on the fly when needed.

Both spend and view secret keys are kept encrypted in a JSON
field in the keys file. This avoids leaving the keys in
memory due to being manipulated by the JSON I/O API.

1 files changed, 71 insertions, 0 deletions

diff --git a/tests/unit_tests/account.cpp b/tests/unit_tests/account.cpp
new file mode 100644
index 000000000..113622b5e
--- /dev/null
+++ b/tests/unit_tests/account.cpp
@@ -0,0 +1,71 @@
+// Copyright (c) 2014-2018, The Monero Project
+// 
+// All rights reserved.
+// 
+// Redistribution and use in source and binary forms, with or without modification, are
+// permitted provided that the following conditions are met:
+// 
+// 1. Redistributions of source code must retain the above copyright notice, this list of
+//    conditions and the following disclaimer.
+// 
+// 2. Redistributions in binary form must reproduce the above copyright notice, this list
+//    of conditions and the following disclaimer in the documentation and/or other
+//    materials provided with the distribution.
+// 
+// 3. Neither the name of the copyright holder nor the names of its contributors may be
+//    used to endorse or promote products derived from this software without specific
+//    prior written permission.
+// 
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include "gtest/gtest.h"
+
+#include "cryptonote_basic/account.h"
+
+TEST(account, encrypt_keys)
+{
+  cryptonote::keypair recovery_key = cryptonote::keypair::generate(hw::get_device("default"));
+  cryptonote::account_base account;
+  crypto::secret_key key = account.generate(recovery_key.sec);
+  const cryptonote::account_keys keys = account.get_keys();
+
+  ASSERT_EQ(account.get_keys().m_account_address, keys.m_account_address);
+  ASSERT_EQ(account.get_keys().m_spend_secret_key, keys.m_spend_secret_key);
+  ASSERT_EQ(account.get_keys().m_view_secret_key, keys.m_view_secret_key);
+  ASSERT_EQ(account.get_keys().m_multisig_keys, keys.m_multisig_keys);
+
+  crypto::chacha_key chacha_key;
+  crypto::generate_chacha_key(&recovery_key, sizeof(recovery_key), chacha_key, 1);
+
+  account.encrypt_keys(chacha_key);
+
+  ASSERT_EQ(account.get_keys().m_account_address, keys.m_account_address);
+  ASSERT_NE(account.get_keys().m_spend_secret_key, keys.m_spend_secret_key);
+  ASSERT_NE(account.get_keys().m_view_secret_key, keys.m_view_secret_key);
+
+  account.decrypt_viewkey(chacha_key);
+
+  ASSERT_EQ(account.get_keys().m_account_address, keys.m_account_address);
+  ASSERT_NE(account.get_keys().m_spend_secret_key, keys.m_spend_secret_key);
+  ASSERT_EQ(account.get_keys().m_view_secret_key, keys.m_view_secret_key);
+
+  account.encrypt_viewkey(chacha_key);
+
+  ASSERT_EQ(account.get_keys().m_account_address, keys.m_account_address);
+  ASSERT_NE(account.get_keys().m_spend_secret_key, keys.m_spend_secret_key);
+  ASSERT_NE(account.get_keys().m_view_secret_key, keys.m_view_secret_key);
+
+  account.decrypt_keys(chacha_key);
+
+  ASSERT_EQ(account.get_keys().m_account_address, keys.m_account_address);
+  ASSERT_EQ(account.get_keys().m_spend_secret_key, keys.m_spend_secret_key);
+  ASSERT_EQ(account.get_keys().m_view_secret_key, keys.m_view_secret_key);
+}