From eb2ce22eff2e64ebd30a80d0edc043d27695075a Mon Sep 17 00:00:00 2001
From: JoelKatz <DavidJoelSchwartz@GMail.com>
Date: Fri, 8 Jun 2012 20:45:20 -0700
Subject: [PATCH] Our bit order change to uint256 broke the logic used to
 convert CBigNum's to and from uint256's. This code is really awful though. We
 probably should just re-implement what we need of it. (Which is very little.)
 It looks like the author just didn't know about BN_bin2bn and BIN_bn2bin.

---
 src/bignum.h | 44 ++++++++------------------------------------
 1 file changed, 8 insertions(+), 36 deletions(-)

diff --git a/src/bignum.h b/src/bignum.h
index 01e614a79c..e11de65026 100644
--- a/src/bignum.h
+++ b/src/bignum.h
@@ -186,47 +186,19 @@ public:
         BN_mpi2bn(pch, p - pch, this);
     }
 
-    void setuint256(uint256 n)
+    void setuint256(const uint256& n)
     {
-        unsigned char pch[sizeof(n) + 6];
-        unsigned char* p = pch + 4;
-        bool fLeadingZeroes = true;
-        unsigned char* pbegin = (unsigned char*)&n;
-        unsigned char* psrc = pbegin + sizeof(n);
-        while (psrc != pbegin)
-        {
-            unsigned char c = *(--psrc);
-            if (fLeadingZeroes)
-            {
-                if (c == 0)
-                    continue;
-                if (c & 0x80)
-                    *p++ = 0;
-                fLeadingZeroes = false;
-            }
-            *p++ = c;
-        }
-        unsigned int nSize = p - (pch + 4);
-        pch[0] = (nSize >> 24) & 0xff;
-        pch[1] = (nSize >> 16) & 0xff;
-        pch[2] = (nSize >> 8) & 0xff;
-        pch[3] = (nSize >> 0) & 0xff;
-        BN_mpi2bn(pch, p - pch, this);
+    	BN_bin2bn(n.begin(), n.size(), NULL);
     }
 
     uint256 getuint256()
     {
-        unsigned int nSize = BN_bn2mpi(this, NULL);
-        if (nSize < 4)
-            return 0;
-        std::vector<unsigned char> vch(nSize);
-        BN_bn2mpi(this, &vch[0]);
-        if (vch.size() > 4)
-            vch[4] &= 0x7f;
-        uint256 n = 0;
-        for (int i = 0, j = vch.size()-1; i < sizeof(n) && j >= 4; i++, j--)
-            ((unsigned char*)&n)[i] = vch[j];
-        return n;
+		uint256 ret;
+		int size = BN_num_bytes(this);
+		if (size > ret.size())
+			return ret;
+		BN_bn2bin(this, ret.begin() + (ret.size() - BN_num_bytes(this)));
+        return ret;
     }
 
     void setvch(const std::vector<unsigned char>& vch)