eliminated sha256

src/main.cpp

@@ -4294,27 +4294,6 @@ int static FormatHashBlocks(void* pbuffer, unsigned int len)
     return blocks;
 }
 
-static const unsigned int pSHA256InitState[8] =
-{0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a, 0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19};
-
-void SHA256Transform(void* pstate, void* pinput, const void* pinit)
-{
-    SHA256_CTX ctx;
-    unsigned char data[64];
-
-    SHA256_Init(&ctx);
-
-    for (int i = 0; i < 16; i++)
-        ((uint32_t*)data)[i] = ByteReverse(((uint32_t*)pinput)[i]);
-
-    for (int i = 0; i < 8; i++)
-        ctx.h[i] = ((uint32_t*)pinit)[i];
-
-    SHA256_Update(&ctx, data, sizeof(data));
-    for (int i = 0; i < 8; i++)
-        ((uint32_t*)pstate)[i] = ctx.h[i];
-}
-
 // Some explaining would be appreciated
 class COrphan
 {
@@ -4634,7 +4613,7 @@ void IncrementExtraNonce(CBlock* pblock, CBlockIndex* pindexPrev, unsigned int&
 }
 
 
-void FormatHashBuffers(CBlock* pblock, char* pmidstate, char* pdata, char* phash1)
+void FormatHashBuffers(CBlock* pblock, char* pdata, char* phash1)
 {
     //
     // Pre-build hash buffers
@@ -4672,9 +4651,6 @@ void FormatHashBuffers(CBlock* pblock, char* pmidstate, char* pdata, char* phash
     for (unsigned int i = 0; i < sizeof(tmp)/4; i++)
         ((unsigned int*)&tmp)[i] = ByteReverse(((unsigned int*)&tmp)[i]);
 
-    // Precalc the first half of the first hash, which stays constant
-    SHA256Transform(pmidstate, &tmp.block, pSHA256InitState);
-
     memcpy(pdata, &tmp.block, 128);
     memcpy(phash1, &tmp.hash1, 64);
 }

src/main.h

@@ -163,7 +163,7 @@ CBlockTemplate* CreateNewBlockWithKey(CReserveKey& reservekey);
 /** Modify the extranonce in a block */
 void IncrementExtraNonce(CBlock* pblock, CBlockIndex* pindexPrev, unsigned int& nExtraNonce);
 /** Do mining precalculation */
-void FormatHashBuffers(CBlock* pblock, char* pmidstate, char* pdata, char* phash1);
+void FormatHashBuffers(CBlock* pblock, char* pdata, char* phash1);
 /** Check mined block */
 bool CheckWork(CBlock* pblock, CWallet& wallet, CReserveKey& reservekey);
 /** Check whether a block hash satisfies the proof-of-work requirement specified by nBits */

src/rpcmining.cpp

@@ -231,10 +231,9 @@ Value getworkex(const Array& params, bool fHelp)
         mapNewBlock[pblock->hashMerkleRoot] = make_pair(pblock, pblock->vtx[0].vin[0].scriptSig);
 
         // Pre-build hash buffers
-        char pmidstate[32];
         char pdata[128];
         char phash1[64];
-        FormatHashBuffers(pblock, pmidstate, pdata, phash1);
+        FormatHashBuffers(pblock, pdata, phash1);
 
         uint256 hashTarget = CBigNum().SetCompact(pblock->nBits).getuint256();
 
@@ -370,15 +369,13 @@ Value getwork(const Array& params, bool fHelp)
         mapNewBlock[pblock->hashMerkleRoot] = make_pair(pblock, pblock->vtx[0].vin[0].scriptSig);
 
         // Pre-build hash buffers
-        char pmidstate[32];
         char pdata[128];
         char phash1[64];
-        FormatHashBuffers(pblock, pmidstate, pdata, phash1);
+        FormatHashBuffers(pblock, pdata, phash1);
 
         uint256 hashTarget = CBigNum().SetCompact(pblock->nBits).getuint256();
 
         Object result;
-        result.push_back(Pair("midstate", HexStr(BEGIN(pmidstate), END(pmidstate)))); // deprecated
         result.push_back(Pair("data",     HexStr(BEGIN(pdata), END(pdata))));
         result.push_back(Pair("hash1",    HexStr(BEGIN(phash1), END(phash1)))); // deprecated
         result.push_back(Pair("target",   HexStr(BEGIN(hashTarget), END(hashTarget))));