Code modifications to integrate Ledger HW device into monero-wallet-cli.

The basic approach it to delegate all sensitive data (master key, secret
ephemeral key, key derivation, ....) and related operations to the device.
As device has low memory, it does not keep itself the values
(except for view/spend keys) but once computed there are encrypted (with AES
are equivalent) and return back to monero-wallet-cli. When they need to be
manipulated by the device, they are decrypted on receive.

Moreover, using the client for storing the value in encrypted form limits
the modification in the client code. Those values are transfered from one
C-structure to another one as previously.

The code modification has been done with the wishes to be open to any
other hardware wallet. To achieve that a C++ class hw::Device has been
introduced. Two initial implementations are provided: the "default", which
remaps all calls to initial Monero code, and  the "Ledger", which delegates
all calls to Ledger device.

1 files changed, 44 insertions, 0 deletions

diff --git a/cmake/FindPCSC.cmake b/cmake/FindPCSC.cmake
new file mode 100644
index 000000000..8dd9d0e76
--- /dev/null
+++ b/cmake/FindPCSC.cmake
@@ -0,0 +1,44 @@
+# - Find PCSC
+# Find the native PCSC includes and library
+#
+#  PCSC_INCLUDE_DIR - where to find winscard.h, wintypes.h, etc.
+#  PCSC_LIBRARIES   - List of libraries when using PCSC.
+#  PCSC_FOUND       - True if PCSC found.
+
+
+IF (PCSC_INCLUDE_DIR AND PCSC_LIBRARIES)
+  # Already in cache, be silent
+  SET(PCSC_FIND_QUIETLY TRUE)
+ENDIF (PCSC_INCLUDE_DIR AND PCSC_LIBRARIES)
+
+IF (NOT WIN32)
+  FIND_PACKAGE(PkgConfig)
+  PKG_CHECK_MODULES(PC_PCSC libpcsclite)
+ENDIF (NOT WIN32)
+
+FIND_PATH(PCSC_INCLUDE_DIR winscard.h
+  HINTS
+  /usr/include/PCSC
+  ${PC_PCSC_INCLUDEDIR}
+  ${PC_PCSC_INCLUDE_DIRS}
+  PATH_SUFFIXES PCSC
+  )
+
+FIND_LIBRARY(PCSC_LIBRARY NAMES pcsclite libpcsclite WinSCard PCSC
+  HINTS
+  ${PC_PCSC_LIBDIR}
+  ${PC_PCSC_LIBRARY_DIRS}
+  )
+
+# handle the QUIETLY and REQUIRED arguments and set PCSC_FOUND to TRUE if 
+# all listed variables are TRUE
+INCLUDE(FindPackageHandleStandardArgs)
+FIND_PACKAGE_HANDLE_STANDARD_ARGS(PCSC DEFAULT_MSG PCSC_LIBRARY PCSC_INCLUDE_DIR)
+
+IF(PCSC_FOUND)
+  SET( PCSC_LIBRARIES ${PCSC_LIBRARY} )
+ELSE(PCSC_FOUND)
+  SET( PCSC_LIBRARIES )
+ENDIF(PCSC_FOUND)
+
+MARK_AS_ADVANCED( PCSC_LIBRARY PCSC_INCLUDE_DIR )