ringct: add bos coster multiexp

1 files changed, 60 insertions, 0 deletions

diff --git a/src/ringct/multiexp.h b/src/ringct/multiexp.h
new file mode 100644
index 000000000..108db7c39
--- /dev/null
+++ b/src/ringct/multiexp.h
@@ -0,0 +1,60 @@
+// Copyright (c) 2017, 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.
+//
+// Adapted from Python code by Sarang Noether
+
+#pragma once
+
+#ifndef MULTIEXP_H
+#define MULTIEXP_H
+
+#include <vector>
+#include "crypto/crypto.h"
+#include "rctTypes.h"
+
+namespace rct
+{
+
+struct MultiexpData {
+  rct::key scalar;
+  ge_p3 point;
+
+  MultiexpData() {}
+  MultiexpData(const rct::key &s, const ge_p3 &p): scalar(s), point(p) {}
+  MultiexpData(const rct::key &s, const rct::key &p): scalar(s)
+  {
+    CHECK_AND_ASSERT_THROW_MES(ge_frombytes_vartime(&point, p.bytes) == 0, "ge_frombytes_vartime failed");
+  }
+};
+
+rct::key bos_coster_heap_conv(std::vector<MultiexpData> &data);
+rct::key bos_coster_heap_conv_robust(std::vector<MultiexpData> &data);
+
+}
+
+#endif