From 6d55dcba54ceaccc9d90ea7c2f1746524a6e81e3 Mon Sep 17 00:00:00 2001
From: Dennis Brentjes <d.brentjes@gmail.com>
Date: Fri, 18 Nov 2016 12:47:35 +0100
Subject: Made permutation a responsibility of cmix in the precomputation
 phase.

---
 node/node_node.cpp | 56 ++++++++++++++++++++++++++++--------------------------
 1 file changed, 29 insertions(+), 27 deletions(-)

(limited to 'node/node_node.cpp')

diff --git a/node/node_node.cpp b/node/node_node.cpp
index 7b745ed..1742035 100644
--- a/node/node_node.cpp
+++ b/node/node_node.cpp
@@ -11,6 +11,13 @@ cmix_proto::PrePre fill_precomputation_pre_message(CMixContext& ctx, T const& rs
 		exit(-1);
 	}
 	
+	std::stringstream ss; 
+	ss << "permutation:";
+	for(auto i = 0; i < ctx.nr_participants; ++i) {
+		ss << " " << ctx.permutation[i];
+	}
+	BOOST_LOG_TRIVIAL(trace) << ss.str();
+	
 	cmix_proto::PrePre prepre;
 	
 	for(size_t i = 0; i < ms.size(); ++i) {
@@ -50,36 +57,32 @@ template <typename T>
 cmix_proto::PreMix fill_precomputation_mix_message(CMixContext const& ctx, T const& rs, T const& ms) {
 	cmix_proto::PreMix premix;
 	
+	size_t el_len = get_group_element_array_size(&ctx);
+	std::vector<char*> r_epirs(ms.size(), nullptr);
+	std::vector<char*> m_epirs(ms.size(), nullptr);
+	std::vector<char const*> rsv(ms.size(), nullptr);
+	std::vector<char const*> msv(ms.size(), nullptr);
 	for(size_t i = 0; i < ms.size(); ++i) {
-		premix.add_r_epirs();
-		premix.add_m_epirs();
-	}
-	for(size_t i = 0; i < ms.size(); ++i) {
-		auto new_pos = ctx.permutation[i];
-		size_t el_len = get_group_element_array_size(&ctx);
-		
-		premix.mutable_r_epirs(new_pos)->resize(el_len);
-		premix.mutable_m_epirs(new_pos)->resize(el_len);
+		std::string* r = premix.add_r_epirs();
+		r->resize(el_len);
+		r_epirs[i] = &(*r)[0];
 		
-		{
-			std::stringstream ss;
-			ss << "s: ";
-			std::string s = to_string(ctx.s[i], ctx);
-			for(auto&& c : s) {
-				ss << "\\" << std::setw(3) << std::setfill('0') << std::oct << (unsigned int) c;
-			}
-			BOOST_LOG_TRIVIAL(trace) << ss.str();
-		}
+		std::string* m = premix.add_m_epirs();
+		m->resize(el_len);
+		m_epirs[i] = &(*m)[0];
 		
-		multiply_encrypted_s(
-			&ctx,
-			&(*premix.mutable_r_epirs(new_pos))[0],
-			&(*premix.mutable_m_epirs(new_pos))[0],
-			rs.Get(i).data(),
-			ms.Get(i).data(),
-			i
-		);
+		rsv[i] = rs.Get(i).data();
+		msv[i] = ms.Get(i).data();
 	}
+	
+	permute_and_multiply_encrypted_s(
+		&ctx,
+		r_epirs.data(),
+		m_epirs.data(),
+		rsv.data(),
+		msv.data(),
+		ms.size()
+	);
 	return premix;
 }
 
@@ -114,7 +117,6 @@ cmix_proto::PrePost fill_precomputation_post_message(CMixContext& ctx, T const&
 			}
 			BOOST_LOG_TRIVIAL(trace) << ss.str();
 		} 
-		
 	}
 	
 	return prepost;
-- 
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