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, 6 insertions, 0 deletions

diff --git a/src/ringct/rctOps.h b/src/ringct/rctOps.h
index 3f8f6955c..c9f2e7a43 100644
--- a/src/ringct/rctOps.h
+++ b/src/ringct/rctOps.h
@@ -112,10 +112,14 @@ namespace rct {
 
     //does a * G where a is a scalar and G is the curve basepoint
     void scalarmultBase(key & aG, const key &a);
+    void scalarmultBase(key & aG, const key &a, hw::device &hwdev);
     key scalarmultBase(const key & a);
+    key scalarmultBase(const key & a, hw::device &hwdev);
     //does a * P where a is a scalar and P is an arbitrary point
     void scalarmultKey(key &aP, const key &P, const key &a);
+    void scalarmultKey(key &aP, const key &P, const key &a, hw::device &hwdev);
     key scalarmultKey(const key &P, const key &a);
+    key scalarmultKey(const key &P, const key &a, hw::device &hwdev);
     //Computes aH where H= toPoint(cn_fast_hash(G)), G the basepoint
     key scalarmultH(const key & a);
 
@@ -174,6 +178,8 @@ namespace rct {
     //Elliptic Curve Diffie Helman: encodes and decodes the amount b and mask a
     // where C= aG + bH
     void ecdhEncode(ecdhTuple & unmasked, const key & sharedSec);
+    void ecdhEncode(ecdhTuple & unmasked, const key & sharedSec, hw::device &hwdev);
     void ecdhDecode(ecdhTuple & masked, const key & sharedSec);
+    void ecdhDecode(ecdhTuple & masked, const key & sharedSec, hw::device &hwdev);
 }
 #endif  /* RCTOPS_H */