Implementation of VerusHash CPU-friendly hash algorithm, parameters to enable it, miner, and all changes required to support it on new asset chains

src/crypto/verus_hash.h

@@ -0,0 +1,54 @@
+// (C) 2018 The Verus Developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+/*
+This provides the PoW hash function for Verus, enabling CPU mining.
+*/
+#ifndef VERUS_HASH_H_
+#define VERUS_HASH_H_
+
+#include <cstring>
+#include <vector>
+
+extern "C" 
+{
+#include "crypto/haraka.h"
+}
+
+class CVerusHash
+{
+    public:
+        static void Hash(void *result, const void *data, size_t len);
+
+        CVerusHash() {}
+
+        CVerusHash &Write(const unsigned char *data, size_t len);
+
+        CVerusHash &Reset()
+        {
+            curBuf = buf1;
+            result = buf2;
+            curPos = 0;
+            std::fill(buf1, buf1 + sizeof(buf1), 0);
+            std::fill(buf2, buf2 + sizeof(buf2), 0);
+        }
+
+        void Finalize(unsigned char hash[32])
+        {
+            if (curPos)
+            {
+                std::fill(curBuf + 32 + curPos, curBuf + 64, 0);
+                haraka512(hash, curBuf);
+            }
+            else
+                std::memcpy(hash, result, 32);
+        }
+
+    private:
+        unsigned char buf1[64], buf2[64];
+        unsigned char *curBuf = buf1, *result = buf2;
+        size_t curPos = 0;
+};
+
+#endif