1 files changed, 83 insertions, 0 deletions
diff --git a/lib/crypto/CipherContext.h b/lib/crypto/CipherContext.h
new file mode 100755
index 00000000..f9dcd022
--- /dev/null
+++ b/lib/crypto/CipherContext.h
@@ -0,0 +1,83 @@
+// --------------------------------------------------------------------------
+//
+// File
+//		Name:    CipherContext.h
+//		Purpose: Context for symmetric encryption / descryption
+//		Created: 1/12/03
+//
+// --------------------------------------------------------------------------
+
+#ifndef CIPHERCONTEXT__H
+#define CIPHERCONTEXT__H
+
+#ifdef BOX_LIB_CRYPTO_OPENSSL_HEADERS_INCLUDED_FALSE
+	always include CipherContext.h first in any .cpp file
+#endif
+#define BOX_LIB_CRYPTO_OPENSSL_HEADERS_INCLUDED_TRUE
+#include <openssl/evp.h>
+class CipherDescription;
+
+#define CIPHERCONTEXT_MAX_GENERATED_IV_LENGTH		32
+
+// --------------------------------------------------------------------------
+//
+// Class
+//		Name:    CipherContext
+//		Purpose: Context for symmetric encryption / descryption
+//		Created: 1/12/03
+//
+// --------------------------------------------------------------------------
+class CipherContext
+{
+public:
+	CipherContext();
+	~CipherContext();
+private:
+	CipherContext(const CipherContext &);	// no copying
+	CipherContext &operator=(const CipherContext &);	// no assignment
+public:
+
+	typedef enum
+	{
+		Decrypt = 0,
+		Encrypt = 1
+	} CipherFunction;
+
+	void Init(CipherContext::CipherFunction Function, const CipherDescription &rDescription);
+	void Reset();
+	
+	void Begin();
+	int Transform(void *pOutBuffer, int OutLength, const void *pInBuffer, int InLength);
+	int Final(void *pOutBuffer, int OutLength);
+	int InSizeForOutBufferSize(int OutLength);
+	int MaxOutSizeForInBufferSize(int InLength);
+	
+	int TransformBlock(void *pOutBuffer, int OutLength, const void *pInBuffer, int InLength);
+
+	bool IsInitialised() {return mInitialised;}
+	
+	int GetIVLength();
+	void SetIV(const void *pIV);
+	const void *SetRandomIV(int &rLengthOut);
+	
+	void UsePadding(bool Padding = true);
+
+#ifdef PLATFORM_OLD_OPENSSL
+	void OldOpenSSLFinal(unsigned char *Buffer, int &rOutLengthOut);
+#endif
+	
+private:
+	EVP_CIPHER_CTX ctx;
+	bool mInitialised;
+	bool mWithinTransform;
+	bool mPaddingOn;
+	uint8_t mGeneratedIV[CIPHERCONTEXT_MAX_GENERATED_IV_LENGTH];
+#ifdef PLATFORM_OLD_OPENSSL
+	CipherFunction mFunction;
+	CipherDescription *mpDescription;
+#endif
+};
+
+
+#endif // CIPHERCONTEXT__H
+