From 6a0c7ceae9f604df57a93e790d24ec2679b7e2c0 Mon Sep 17 00:00:00 2001
From: Sean Bowe <ewillbefull@gmail.com>
Date: Fri, 17 Mar 2017 11:46:41 -0600
Subject: [PATCH] Introduce librustzcash and Rust to depends system.

---
 configure.ac                     |  2 +-
 depends/packages/librustzcash.mk | 19 +++++++++++++++++++
 depends/packages/packages.mk     |  2 +-
 depends/packages/rust.mk         |  9 +++++++++
 src/pow.cpp                      |  8 ++++++++
 5 files changed, 38 insertions(+), 2 deletions(-)
 create mode 100644 depends/packages/librustzcash.mk
 create mode 100644 depends/packages/rust.mk

diff --git a/configure.ac b/configure.ac
index 44dd34bd5..7be76833c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -751,7 +751,7 @@ CPPFLAGS="-I$LIBSNARK_INCDIR $CPPFLAGS"
 AC_CHECK_HEADER([libsnark/gadgetlib1/gadget.hpp],,AC_MSG_ERROR(libsnark headers missing))
 AC_CHECK_LIB([snark],[main],LIBSNARK_LIBS=-lsnark, [AC_MSG_ERROR(libsnark missing)], [-lgmpxx])
 
-LIBZCASH_LIBS="-lsnark -lgmp -lgmpxx -lboost_system-mt -lcrypto -lsodium -fopenmp"
+LIBZCASH_LIBS="-lrustzcash -lsnark -lgmp -lgmpxx -lboost_system-mt -lcrypto -lsodium -fopenmp"
 
 CXXFLAGS_TEMP="$CXXFLAGS"
 LIBS_TEMP="$LIBS"
diff --git a/depends/packages/librustzcash.mk b/depends/packages/librustzcash.mk
new file mode 100644
index 000000000..e27adec26
--- /dev/null
+++ b/depends/packages/librustzcash.mk
@@ -0,0 +1,19 @@
+package=librustzcash
+$(package)_version=0.1
+$(package)_download_path=https://github.com/zcash/$(package)/archive/
+$(package)_file_name=$(package)-$($(package)_git_commit).tar.gz
+$(package)_download_file=$($(package)_git_commit).tar.gz
+$(package)_sha256_hash=a5760a90d4a1045c8944204f29fa2a3cf2f800afee400f88bf89bbfe2cce1279
+$(package)_git_commit=91348647a86201a9482ad4ad68398152dc3d635e
+$(package)_dependencies=rust
+
+define $(package)_build_cmds
+  cargo build --release
+endef
+
+define $(package)_stage_cmds
+  mkdir $($(package)_staging_dir)$(host_prefix)/lib/ && \
+  mkdir $($(package)_staging_dir)$(host_prefix)/include/ && \
+  cp target/release/librustzcash.a $($(package)_staging_dir)$(host_prefix)/lib/ && \
+  cp include/librustzcash.h $($(package)_staging_dir)$(host_prefix)/include/
+endef
diff --git a/depends/packages/packages.mk b/depends/packages/packages.mk
index 28c7afb25..7710c0f47 100644
--- a/depends/packages/packages.mk
+++ b/depends/packages/packages.mk
@@ -1,4 +1,4 @@
-zcash_packages := libsnark libgmp libsodium
+zcash_packages := libsnark libgmp libsodium rust librustzcash
 packages := boost openssl zeromq $(zcash_packages) googletest googlemock
 native_packages := native_ccache
 
diff --git a/depends/packages/rust.mk b/depends/packages/rust.mk
new file mode 100644
index 000000000..cdefbdbee
--- /dev/null
+++ b/depends/packages/rust.mk
@@ -0,0 +1,9 @@
+package=rust
+$(package)_version=1.16.0
+$(package)_download_path=https://static.rust-lang.org/dist
+$(package)_file_name=rust-$($(package)_version)-x86_64-unknown-linux-gnu.tar.gz
+$(package)_sha256_hash=48621912c242753ba37cad5145df375eeba41c81079df46f93ffb4896542e8fd
+
+define $(package)_stage_cmds
+  ./install.sh --destdir=$($(package)_staging_dir) --prefix=$(host_prefix)/native --disable-ldconfig
+endef
diff --git a/src/pow.cpp b/src/pow.cpp
index 18873d4ee..298b77fd0 100644
--- a/src/pow.cpp
+++ b/src/pow.cpp
@@ -5,6 +5,8 @@
 
 #include "pow.h"
 
+#include "librustzcash.h"
+
 #include "arith_uint256.h"
 #include "chain.h"
 #include "chainparams.h"
@@ -96,6 +98,12 @@ bool CheckEquihashSolution(const CBlockHeader *pblock, const CChainParams& param
     // H(I||V||...
     crypto_generichash_blake2b_update(&state, (unsigned char*)&ss[0], ss.size());
 
+    // Ensure that our Rust interactions are working in production builds. This is
+    // temporary and should be removed.
+    {
+        assert(librustzcash_xor(0x0f0f0f0f0f0f0f0f, 0x1111111111111111) == 0x1e1e1e1e1e1e1e1e);
+    }
+
     bool isValid;
     EhIsValidSolution(n, k, state, pblock->nSolution, isValid);
     if (!isValid)