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Diffstat (limited to 'lib/crypto/CipherContext.h')
| -rw-r--r-- | lib/crypto/CipherContext.h | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/lib/crypto/CipherContext.h b/lib/crypto/CipherContext.h new file mode 100644 index 00000000..427c78d2 --- /dev/null +++ b/lib/crypto/CipherContext.h @@ -0,0 +1,121 @@ +// distribution boxbackup-0.10 (svn version: 494) +// +// Copyright (c) 2003 - 2006 +// Ben Summers and contributors. All rights reserved. +// +// Redistribution and use in source and binary forms, with or without +// modification, are permitted provided that the following conditions +// are met: +// 1. Redistributions of source code must retain the above copyright +// notice, this list of conditions and the following disclaimer. +// 2. Redistributions in binary form must reproduce the above copyright +// notice, this list of conditions and the following disclaimer in the +// documentation and/or other materials provided with the distribution. +// 3. All use of this software and associated advertising materials must +// display the following acknowledgment: +// This product includes software developed by Ben Summers. +// 4. The names of the Authors may not be used to endorse or promote +// products derived from this software without specific prior written +// permission. +// +// [Where legally impermissible the Authors do not disclaim liability for +// direct physical injury or death caused solely by defects in the software +// unless it is modified by a third party.] +// +// THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR +// IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED +// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE +// DISCLAIMED. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, +// INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES +// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR +// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) +// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, +// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN +// ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE +// POSSIBILITY OF SUCH DAMAGE. +// +// +// +// -------------------------------------------------------------------------- +// +// 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 HAVE_OLD_SSL + 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 HAVE_OLD_SSL + CipherFunction mFunction; + CipherDescription *mpDescription; +#endif +}; + + +#endif // CIPHERCONTEXT__H + |