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/*
* Copyright (c) 2010 SURFnet bv
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
/*****************************************************************************
AsymmetricAlgorithm.cpp
Base class for asymmetric algorithm classes
*****************************************************************************/
#include "config.h"
#include "log.h"
#include "AsymmetricAlgorithm.h"
// Base constructor
AsymmetricAlgorithm::AsymmetricAlgorithm()
{
currentOperation = NONE;
currentMechanism = AsymMech::Unknown;
currentPadding = AsymMech::Unknown;
currentPublicKey = NULL;
currentPrivateKey = NULL;
}
// Signing functions
bool AsymmetricAlgorithm::sign(PrivateKey* privateKey, const ByteString& dataToSign,
ByteString& signature, const AsymMech::Type mechanism,
const void* param /* = NULL */, const size_t paramLen /* = 0 */)
{
// Compose from multi-part operations
return (signInit(privateKey, mechanism, param, paramLen) && signUpdate(dataToSign) && signFinal(signature));
}
bool AsymmetricAlgorithm::signInit(PrivateKey* privateKey, const AsymMech::Type mechanism,
const void* /* param = NULL */, const size_t /* paramLen = 0 */)
{
if ((currentOperation != NONE) || (privateKey == NULL))
{
return false;
}
currentPrivateKey = privateKey;
currentMechanism = mechanism;
currentOperation = SIGN;
return true;
}
bool AsymmetricAlgorithm::signUpdate(const ByteString& /*dataToSign*/)
{
if (currentOperation != SIGN)
{
return false;
}
return true;
}
bool AsymmetricAlgorithm::signFinal(ByteString& /*signature*/)
{
if (currentOperation != SIGN)
{
return false;
}
currentOperation = NONE;
currentPrivateKey = NULL;
currentMechanism = AsymMech::Unknown;
return true;
}
// Verification functions
bool AsymmetricAlgorithm::verify(PublicKey* publicKey, const ByteString& originalData,
const ByteString& signature, const AsymMech::Type mechanism,
const void* param /* = NULL */, const size_t paramLen /* = 0 */)
{
// Compose from multi-part operations
return (verifyInit(publicKey, mechanism, param, paramLen) && verifyUpdate(originalData) && verifyFinal(signature));
}
bool AsymmetricAlgorithm::verifyInit(PublicKey* publicKey, const AsymMech::Type mechanism,
const void* /* param = NULL */, const size_t /* paramLen = 0 */)
{
if ((currentOperation != NONE) || (publicKey == NULL))
{
return false;
}
currentOperation = VERIFY;
currentPublicKey = publicKey;
currentMechanism = mechanism;
return true;
}
bool AsymmetricAlgorithm::verifyUpdate(const ByteString& /*originalData*/)
{
if (currentOperation != VERIFY)
{
return false;
}
return true;
}
bool AsymmetricAlgorithm::verifyFinal(const ByteString& /*signature*/)
{
if (currentOperation != VERIFY)
{
return false;
}
currentOperation = NONE;
currentPublicKey = NULL;
currentMechanism = AsymMech::Unknown;
return true;
}
// Returns true for mechanisms which have 'tick mark' in Wrap&Unwrap column in PKCS #11 Mechanisms v2.40
bool AsymmetricAlgorithm::isWrappingMech(AsymMech::Type padding)
{
switch (padding)
{
case AsymMech::RSA:
case AsymMech::RSA_PKCS:
case AsymMech::RSA_PKCS_OAEP:
return true;
default:
return false;
}
}
// Wrap/Unwrap keys
bool AsymmetricAlgorithm::wrapKey(PublicKey* publicKey, const ByteString& data, ByteString& encryptedData, const AsymMech::Type padding)
{
if (!isWrappingMech(padding))
return false;
return encrypt(publicKey, data, encryptedData, padding);
}
bool AsymmetricAlgorithm::unwrapKey(PrivateKey* privateKey, const ByteString& encryptedData, ByteString& data, const AsymMech::Type padding)
{
if (!isWrappingMech(padding))
return false;
return decrypt(privateKey, encryptedData, data, padding);
}
bool AsymmetricAlgorithm::generateParameters(AsymmetricParameters** /*ppParams*/, void* /*parameters = NULL*/, RNG* /*rng = NULL*/)
{
return false;
}
bool AsymmetricAlgorithm::deriveKey(SymmetricKey** /*ppSymmetricKey*/, PublicKey* /*publicKey*/, PrivateKey* /*privateKey*/)
{
return false;
}
bool AsymmetricAlgorithm::reconstructParameters(AsymmetricParameters** /*ppParams*/, ByteString& /*serialisedData*/)
{
return false;
}
AsymmetricParameters* AsymmetricAlgorithm::newParameters()
{
return NULL;
}
// Key recycling -- override these functions in a derived class if you need to perform specific cleanup
void AsymmetricAlgorithm::recycleKeyPair(AsymmetricKeyPair* toRecycle)
{
delete toRecycle;
}
void AsymmetricAlgorithm::recycleParameters(AsymmetricParameters* toRecycle)
{
delete toRecycle;
}
void AsymmetricAlgorithm::recyclePublicKey(PublicKey* toRecycle)
{
delete toRecycle;
}
void AsymmetricAlgorithm::recyclePrivateKey(PrivateKey* toRecycle)
{
delete toRecycle;
}
void AsymmetricAlgorithm::recycleSymmetricKey(SymmetricKey* toRecycle)
{
delete toRecycle;
}
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