From 0e898e3d6aedc475c39bd8df06bd4cfacaf470f9 Mon Sep 17 00:00:00 2001
From: Arthur Britto <ahbritto@gmail.com>
Date: Sat, 12 May 2012 18:28:16 -0700
Subject: [PATCH] Create uint160extend256.

---
 src/uint256.h |  1 +
 src/utils.cpp | 23 +++++++++++++++++++++++
 2 files changed, 24 insertions(+)

diff --git a/src/uint256.h b/src/uint256.h
index f94097f0ac..d526040996 100644
--- a/src/uint256.h
+++ b/src/uint256.h
@@ -709,6 +709,7 @@ inline const uint256 operator|(const uint256& a, const uint256& b)	  { return (b
 inline const uint256 operator+(const uint256& a, const uint256& b)	  { return (base_uint256)a +  (base_uint256)b; }
 inline const uint256 operator-(const uint256& a, const uint256& b)	  { return (base_uint256)a -  (base_uint256)b; }
 
+uint256 uint160extend256(const uint160& uSource);
 
 inline int Testuint256AdHoc(std::vector<std::string> vArg)
 {
diff --git a/src/utils.cpp b/src/utils.cpp
index 52bbd43cc3..3ae809de7e 100644
--- a/src/utils.cpp
+++ b/src/utils.cpp
@@ -1,4 +1,19 @@
 #include "utils.h"
+#include "uint256.h"
+
+uint256 uint160extend256(const uint160& uSource)
+{
+	uint256 uResult;
+
+	memcpy(uResult.begin() + (uResult.size() - uSource.size()), uSource.begin(), uSource.size());
+
+	return uResult;
+}
+
+//
+// Time support
+// We have our own epoch.
+//
 
 boost::posix_time::ptime ptEpoch()
 {
@@ -19,6 +34,10 @@ boost::posix_time::ptime ptFromSeconds(int iSeconds)
 		: ptEpoch() + boost::posix_time::seconds(iSeconds);
 }
 
+//
+// Hex suport
+//
+
 char charHex(int iDigit)
 {
 	return iDigit < 10 ? '0' + iDigit : 'A' - 10 + iDigit;
@@ -45,6 +64,10 @@ void strUnHex(std::string& strDst, const std::string& strSrc)
 		strDst[i]	= (charUnHex(strSrc[i*2]) << 4) | charUnHex(strSrc[i*2+1]);
 }
 
+//
+// DH support
+//
+
 void DH_der_gen(std::string& strDer, int iKeyLength)
 {
 	DH*	dh	= 0;