From d49fc3aeac4daa65416751f94943b6611ad247d3 Mon Sep 17 00:00:00 2001
From: Mike Buland <eichlan@xagasoft.com>
Date: Tue, 10 Apr 2012 08:32:23 +0000
Subject: Rearranged the Cipher system, and added four modes of operation. 
 It's pretty slick, really, and we actually support four of the most common
 modes.

Blowfish is still a template, but it doesn't really need to be anymore...
---
 src/experimental/ciphermodeofb.h | 56 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)
 create mode 100644 src/experimental/ciphermodeofb.h

(limited to 'src/experimental/ciphermodeofb.h')

diff --git a/src/experimental/ciphermodeofb.h b/src/experimental/ciphermodeofb.h
new file mode 100644
index 0000000..8c2aa20
--- /dev/null
+++ b/src/experimental/ciphermodeofb.h
@@ -0,0 +1,56 @@
+#ifndef BU_MODE_OFB_H
+#define BU_MODE_OFB_H
+
+#include "bu/filter.h"
+#include "bu/string.h"
+
+namespace Bu
+{
+	template<int iBlockSize, typename CipherType>
+	class CipherModeOfb : public CipherType
+	{
+	public:
+		CipherModeOfb(class Stream &rNext ) :
+			CipherType( rNext ),
+			bStart( true )
+		{
+			memset( aVector, 0, iBlockSize );
+		}
+
+		virtual ~CipherModeOfb()
+		{
+		}
+
+		void setIv( const Bu::String &sIv )
+		{
+			memcpy( aVector, sIv.getStr(), iBlockSize );
+		}
+
+	protected:
+		void decipher( void *pBuf )
+		{
+			CipherType::encipher( aVector );
+			uint8_t aTmp[iBlockSize];
+			memcpy( aTmp, aVector, iBlockSize );
+			for( int j = 0; j < iBlockSize; j++ )
+				((uint8_t *)pBuf)[j] ^= aVector[j];
+			memcpy( aVector, aTmp, iBlockSize );
+		}
+
+		void encipher( void *pBuf )
+		{
+			CipherType::encipher( aVector );
+			uint8_t aTmp[iBlockSize];
+			memcpy( aTmp, aVector, iBlockSize );
+			for( int j = 0; j < iBlockSize; j++ )
+				((uint8_t *)pBuf)[j] ^= aVector[j];
+			memcpy( aVector, aTmp, iBlockSize );
+		}
+
+	private:
+		bool bStart;
+		uint8_t aVector[iBlockSize];
+	};
+};
+
+#endif
-- 
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