From 99f8ce096bc5569adbfea1911dbcda24c28d8d8b Mon Sep 17 00:00:00 2001
From: Ben Summers <ben@fluffy.co.uk>
Date: Fri, 14 Oct 2005 08:50:54 +0000
Subject: Box Backup 0.09 with a few tweeks

---
 lib/crypto/CipherAES.cpp | 163 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 163 insertions(+)
 create mode 100644 lib/crypto/CipherAES.cpp

(limited to 'lib/crypto/CipherAES.cpp')

diff --git a/lib/crypto/CipherAES.cpp b/lib/crypto/CipherAES.cpp
new file mode 100644
index 00000000..b4de6048
--- /dev/null
+++ b/lib/crypto/CipherAES.cpp
@@ -0,0 +1,163 @@
+// --------------------------------------------------------------------------
+//
+// File
+//		Name:    CipherAES.cpp
+//		Purpose: AES cipher description
+//		Created: 27/4/04
+//
+// --------------------------------------------------------------------------
+
+#include "Box.h"
+
+// Only available in new versions of openssl
+#ifndef PLATFORM_OLD_OPENSSL
+
+#include <openssl/evp.h>
+
+#define BOX_LIB_CRYPTO_OPENSSL_HEADERS_INCLUDED_TRUE
+
+#include "CipherAES.h"
+#include "CipherException.h"
+
+#include "MemLeakFindOn.h"
+
+
+// --------------------------------------------------------------------------
+//
+// Function
+//		Name:    CipherAES::CipherAES(CipherDescription::CipherMode, const void *, unsigned int, const void *)
+//		Purpose: Constructor -- note key material and IV are not copied. KeyLength in bytes.
+//		Created: 27/4/04
+//
+// --------------------------------------------------------------------------
+CipherAES::CipherAES(CipherDescription::CipherMode Mode, const void *pKey, unsigned int KeyLength, const void *pInitialisationVector)
+	: CipherDescription(),
+	  mMode(Mode),
+	  mpKey(pKey),
+	  mKeyLength(KeyLength),
+	  mpInitialisationVector(pInitialisationVector)
+{
+}
+
+
+// --------------------------------------------------------------------------
+//
+// Function
+//		Name:    CipherAES::CipherAES(const CipherAES &)
+//		Purpose: Copy constructor
+//		Created: 27/4/04
+//
+// --------------------------------------------------------------------------
+CipherAES::CipherAES(const CipherAES &rToCopy)
+	: CipherDescription(rToCopy),
+	  mMode(rToCopy.mMode),
+	  mpKey(rToCopy.mpKey),
+	  mKeyLength(rToCopy.mKeyLength),
+	  mpInitialisationVector(rToCopy.mpInitialisationVector)
+{
+}
+
+
+// --------------------------------------------------------------------------
+//
+// Function
+//		Name:    ~CipherAES::CipherAES()
+//		Purpose: Destructor
+//		Created: 27/4/04
+//
+// --------------------------------------------------------------------------
+CipherAES::~CipherAES()
+{
+}
+
+
+
+// --------------------------------------------------------------------------
+//
+// Function
+//		Name:    CipherAES::operator=(const CipherAES &)
+//		Purpose: Assignment operator
+//		Created: 27/4/04
+//
+// --------------------------------------------------------------------------
+CipherAES &CipherAES::operator=(const CipherAES &rToCopy)
+{
+	CipherDescription::operator=(rToCopy);
+
+	mMode = rToCopy.mMode;
+	mpKey = rToCopy.mpKey;
+	mKeyLength = rToCopy.mKeyLength;
+	mpInitialisationVector = rToCopy.mpInitialisationVector;
+
+	return *this;
+}
+
+
+// --------------------------------------------------------------------------
+//
+// Function
+//		Name:    CipherAES::GetCipher()
+//		Purpose: Returns cipher object
+//		Created: 27/4/04
+//
+// --------------------------------------------------------------------------
+const EVP_CIPHER *CipherAES::GetCipher() const
+{
+	switch(mMode)
+	{
+	case CipherDescription::Mode_ECB:
+		switch(mKeyLength)
+		{
+			case (128/8): return EVP_aes_128_ecb(); break;
+			case (192/8): return EVP_aes_192_ecb(); break;
+			case (256/8): return EVP_aes_256_ecb(); break;
+		default:
+			THROW_EXCEPTION(CipherException, EVPBadKeyLength)
+			break;
+		}
+		break;
+	
+	case CipherDescription::Mode_CBC:
+		switch(mKeyLength)
+		{
+			case (128/8): return EVP_aes_128_cbc(); break;
+			case (192/8): return EVP_aes_192_cbc(); break;
+			case (256/8): return EVP_aes_256_cbc(); break;
+		default:
+			THROW_EXCEPTION(CipherException, EVPBadKeyLength)
+			break;
+		}
+		break;
+	
+	default:
+		break;
+	}
+
+	// Unknown!
+	THROW_EXCEPTION(CipherException, UnknownCipherMode)
+}
+
+// --------------------------------------------------------------------------
+//
+// Function
+//		Name:    CipherAES::SetupParameters(EVP_CIPHER_CTX *)
+//		Purpose: Set up various parameters for cipher
+//		Created: 27/4/04
+//
+// --------------------------------------------------------------------------
+void CipherAES::SetupParameters(EVP_CIPHER_CTX *pCipherContext) const
+{
+	ASSERT(pCipherContext != 0);
+	
+	// Set key (key length is implied)
+	if(EVP_CipherInit_ex(pCipherContext, NULL, NULL, (unsigned char*)mpKey, (unsigned char*)mpInitialisationVector, -1) != 1)
+	{
+		THROW_EXCEPTION(CipherException, EVPInitFailure)
+	}
+	
+}
+
+
+
+#endif // n PLATFORM_OLD_OPENSSL
+
-- 
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