Bench tests for CPubKey<->EllSq

Author: dhruv

src/Makefile.bench.include

@@ -22,6 +22,7 @@ bench_bench_bitcoin_SOURCES = \
   bench/data.h \
   bench/data.cpp \
   bench/duplicate_inputs.cpp \
+  bench/ellsq.cpp \
   bench/examples.cpp \
   bench/rollingbloom.cpp \
   bench/chacha20.cpp \

src/bench/ellsq.cpp

@@ -0,0 +1,46 @@
+// Copyright (c) 2016-2020 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include <bench/bench.h>
+
+#include <pubkey.h>
+#include <random.h>
+
+#include <array>
+
+EllSqPubKey GetRandomEllSq()
+{
+    EllSqPubKey encoded_pubkey;
+
+    // GetRandBytes can only give us up to 32 bytes at a time
+    GetRandBytes(encoded_pubkey.data(), 32);
+    GetRandBytes(encoded_pubkey.data() + 32, 32);
+
+    return encoded_pubkey;
+}
+
+static void EllSqEncode(benchmark::Bench& bench)
+{
+    std::array<uint8_t, 32> rnd32;
+    GetRandBytes(rnd32.data(), 32);
+
+    // Any 64 bytes are a valid encoding for a public key.
+    EllSqPubKey encoded_pubkey = GetRandomEllSq();
+    CPubKey pubkey{encoded_pubkey};
+    bench.batch(1).unit("pubkey").run([&] {
+        pubkey.EllSqEncode(rnd32);
+    });
+}
+
+static void EllSqDecode(benchmark::Bench& bench)
+{
+    // Any 64 bytes are a valid encoding for a public key.
+    EllSqPubKey encoded_pubkey = GetRandomEllSq();
+    bench.batch(1).unit("pubkey").run([&] {
+        CPubKey pubkey{encoded_pubkey};
+    });
+}
+
+BENCHMARK(EllSqEncode);
+BENCHMARK(EllSqDecode);