Portable VerusHash and CPU check

src/crypto/verus_hash.h

@@ -11,9 +11,12 @@ This provides the PoW hash function for Verus, enabling CPU mining.
 #include <cstring>
 #include <vector>
 
+#include <cpuid.h>
+
 extern "C" 
 {
 #include "crypto/haraka.h"
+#include "crypto/haraka_portable.h"
 }
 
 class CVerusHash
@@ -51,6 +54,52 @@ class CVerusHash
         size_t curPos = 0;
 };
 
+class CVerusHashPortable
+{
+    public:
+        static void Hash(void *result, const void *data, size_t len);
+
+        CVerusHashPortable() {}
+
+        CVerusHashPortable &Write(const unsigned char *data, size_t len);
+
+        CVerusHashPortable &Reset()
+        {
+            curBuf = buf1;
+            result = buf2;
+            curPos = 0;
+            std::fill(buf1, buf1 + sizeof(buf1), 0);
+        }
+
+        void Finalize(unsigned char hash[32])
+        {
+            if (curPos)
+            {
+                std::fill(curBuf + 32 + curPos, curBuf + 64, 0);
+                haraka512_port(hash, curBuf);
+            }
+            else
+                std::memcpy(hash, curBuf, 32);
+        }
+
+    private:
+        // only buf1, the first source, needs to be zero initialized
+        unsigned char buf1[64] = {0}, buf2[64];
+        unsigned char *curBuf = buf1, *result = buf2;
+        size_t curPos = 0;
+};
+
 extern void verus_hash(void *result, const void *data, size_t len);
 
+inline bool IsCPUVerusOptimized()
+{
+    unsigned int eax,ebx,ecx,edx;
+
+    if (!__get_cpuid(1,&eax,&ebx,&ecx,&edx))
+    {
+        return false;
+    }
+    return ((ecx & (bit_AVX | bit_AES)) == (bit_AVX | bit_AES));
+};
+
 #endif