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Diffstat (limited to 'lib/crypto/CipherAES.cpp')
| -rw-r--r-- | lib/crypto/CipherAES.cpp | 201 |
1 files changed, 201 insertions, 0 deletions
diff --git a/lib/crypto/CipherAES.cpp b/lib/crypto/CipherAES.cpp new file mode 100644 index 00000000..a8eb63f5 --- /dev/null +++ b/lib/crypto/CipherAES.cpp @@ -0,0 +1,201 @@ +// 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: CipherAES.cpp +// Purpose: AES cipher description +// Created: 27/4/04 +// +// -------------------------------------------------------------------------- + +#include "Box.h" + +// Only available in new versions of openssl +#ifndef HAVE_OLD_SSL + +#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 HAVE_OLD_SSL + |