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Diffstat (limited to 'lib/crypto/CipherBlowfish.cpp')
| -rw-r--r-- | lib/crypto/CipherBlowfish.cpp | 258 |
1 files changed, 258 insertions, 0 deletions
diff --git a/lib/crypto/CipherBlowfish.cpp b/lib/crypto/CipherBlowfish.cpp new file mode 100644 index 00000000..6997560e --- /dev/null +++ b/lib/crypto/CipherBlowfish.cpp @@ -0,0 +1,258 @@ +// 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: CipherBlowfish.cpp +// Purpose: Blowfish cipher description +// Created: 1/12/03 +// +// -------------------------------------------------------------------------- + +#include "Box.h" + +#include <openssl/evp.h> + +#ifdef HAVE_OLD_SSL + #include <string.h> + #include <strings.h> +#endif + +#define BOX_LIB_CRYPTO_OPENSSL_HEADERS_INCLUDED_TRUE + +#include "CipherBlowfish.h" +#include "CipherException.h" + +#include "MemLeakFindOn.h" + +// -------------------------------------------------------------------------- +// +// Function +// Name: CipherBlowfish::CipherBlowfish(CipherDescription::CipherMode, const void *, unsigned int, const void *) +// Purpose: Constructor -- note key material and IV are not copied. KeyLength in bytes. +// Created: 1/12/03 +// +// -------------------------------------------------------------------------- +CipherBlowfish::CipherBlowfish(CipherDescription::CipherMode Mode, const void *pKey, unsigned int KeyLength, const void *pInitialisationVector) + : CipherDescription(), + mMode(Mode) +#ifndef HAVE_OLD_SSL + , mpKey(pKey), + mKeyLength(KeyLength), + mpInitialisationVector(pInitialisationVector) +{ +} +#else +{ + mKey.assign((const char *)pKey, KeyLength); + if(pInitialisationVector == 0) + { + bzero(mInitialisationVector, sizeof(mInitialisationVector)); + } + else + { + ::memcpy(mInitialisationVector, pInitialisationVector, sizeof(mInitialisationVector)); + } +} +#endif + + +// -------------------------------------------------------------------------- +// +// Function +// Name: CipherBlowfish::CipherBlowfish(const CipherBlowfish &) +// Purpose: Copy constructor +// Created: 1/12/03 +// +// -------------------------------------------------------------------------- +CipherBlowfish::CipherBlowfish(const CipherBlowfish &rToCopy) + : CipherDescription(rToCopy), + mMode(rToCopy.mMode), +#ifndef HAVE_OLD_SSL + mpKey(rToCopy.mpKey), + mKeyLength(rToCopy.mKeyLength), + mpInitialisationVector(rToCopy.mpInitialisationVector) +{ +} +#else + mKey(rToCopy.mKey) +{ + ::memcpy(mInitialisationVector, rToCopy.mInitialisationVector, sizeof(mInitialisationVector)); +} +#endif + + +#ifdef HAVE_OLD_SSL +// Hack functions to support old OpenSSL API +CipherDescription *CipherBlowfish::Clone() const +{ + return new CipherBlowfish(*this); +} +void CipherBlowfish::SetIV(const void *pIV) +{ + if(pIV == 0) + { + bzero(mInitialisationVector, sizeof(mInitialisationVector)); + } + else + { + ::memcpy(mInitialisationVector, pIV, sizeof(mInitialisationVector)); + } +} +#endif + + +// -------------------------------------------------------------------------- +// +// Function +// Name: ~CipherBlowfish::CipherBlowfish() +// Purpose: Destructor +// Created: 1/12/03 +// +// -------------------------------------------------------------------------- +CipherBlowfish::~CipherBlowfish() +{ +#ifdef HAVE_OLD_SSL + // Zero copy of key + for(unsigned int l = 0; l < mKey.size(); ++l) + { + mKey[l] = '\0'; + } +#endif +} + + + +// -------------------------------------------------------------------------- +// +// Function +// Name: CipherBlowfish::operator=(const CipherBlowfish &) +// Purpose: Assignment operator +// Created: 1/12/03 +// +// -------------------------------------------------------------------------- +CipherBlowfish &CipherBlowfish::operator=(const CipherBlowfish &rToCopy) +{ + CipherDescription::operator=(rToCopy); + + mMode = rToCopy.mMode; +#ifndef HAVE_OLD_SSL + mpKey = rToCopy.mpKey; + mKeyLength = rToCopy.mKeyLength; + mpInitialisationVector = rToCopy.mpInitialisationVector; +#else + mKey = rToCopy.mKey; + ::memcpy(mInitialisationVector, rToCopy.mInitialisationVector, sizeof(mInitialisationVector)); +#endif + + return *this; +} + + +// -------------------------------------------------------------------------- +// +// Function +// Name: CipherBlowfish::GetCipher() +// Purpose: Returns cipher object +// Created: 1/12/03 +// +// -------------------------------------------------------------------------- +const EVP_CIPHER *CipherBlowfish::GetCipher() const +{ + switch(mMode) + { + case CipherDescription::Mode_ECB: + return EVP_bf_ecb(); + break; + + case CipherDescription::Mode_CBC: + return EVP_bf_cbc(); + break; + + case CipherDescription::Mode_CFB: + return EVP_bf_cfb(); + break; + + case CipherDescription::Mode_OFB: + return EVP_bf_ofb(); + break; + + default: + break; + } + + // Unknown! + THROW_EXCEPTION(CipherException, UnknownCipherMode) +} + +// -------------------------------------------------------------------------- +// +// Function +// Name: CipherBlowfish::SetupParameters(EVP_CIPHER_CTX *) +// Purpose: Set up various parameters for cipher +// Created: 1/12/03 +// +// -------------------------------------------------------------------------- +void CipherBlowfish::SetupParameters(EVP_CIPHER_CTX *pCipherContext) const +{ + ASSERT(pCipherContext != 0); + + // Set key length +#ifndef HAVE_OLD_SSL + if(EVP_CIPHER_CTX_set_key_length(pCipherContext, mKeyLength) != 1) +#else + if(EVP_CIPHER_CTX_set_key_length(pCipherContext, mKey.size()) != 1) +#endif + { + THROW_EXCEPTION(CipherException, EVPBadKeyLength) + } + // Set key +#ifndef HAVE_OLD_SSL + if(EVP_CipherInit_ex(pCipherContext, NULL, NULL, (unsigned char*)mpKey, (unsigned char*)mpInitialisationVector, -1) != 1) +#else + if(EVP_CipherInit(pCipherContext, NULL, (unsigned char*)mKey.c_str(), (unsigned char*)mInitialisationVector, -1) != 1) +#endif + { + THROW_EXCEPTION(CipherException, EVPInitFailure) + } + +} + + + |