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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.
*/
/*****************************************************************************
OSSLDH.cpp
OpenSSL Diffie-Hellman asymmetric algorithm implementation
*****************************************************************************/
#include "config.h"
#include "log.h"
#include "OSSLDH.h"
#include "CryptoFactory.h"
#include "DHParameters.h"
#include "OSSLComp.h"
#include "OSSLDHKeyPair.h"
#include "OSSLUtil.h"
#include <algorithm>
#include <openssl/dh.h>
#include <openssl/pem.h>
#include <openssl/err.h>
// Signing functions
bool OSSLDH::signInit(PrivateKey* /*privateKey*/, const AsymMech::Type /*mechanism*/,
const void* /* param = NULL */, const size_t /* paramLen = 0 */)
{
ERROR_MSG("DH does not support signing");
return false;
}
bool OSSLDH::signUpdate(const ByteString& /*dataToSign*/)
{
ERROR_MSG("DH does not support signing");
return false;
}
bool OSSLDH::signFinal(ByteString& /*signature*/)
{
ERROR_MSG("DH does not support signing");
return false;
}
// Verification functions
bool OSSLDH::verifyInit(PublicKey* /*publicKey*/, const AsymMech::Type /*mechanism*/,
const void* /* param = NULL */, const size_t /* paramLen = 0 */)
{
ERROR_MSG("DH does not support verifying");
return false;
}
bool OSSLDH::verifyUpdate(const ByteString& /*originalData*/)
{
ERROR_MSG("DH does not support verifying");
return false;
}
bool OSSLDH::verifyFinal(const ByteString& /*signature*/)
{
ERROR_MSG("DH does not support verifying");
return false;
}
// Encryption functions
bool OSSLDH::encrypt(PublicKey* /*publicKey*/, const ByteString& /*data*/,
ByteString& /*encryptedData*/, const AsymMech::Type /*padding*/)
{
ERROR_MSG("DH does not support encryption");
return false;
}
// Decryption functions
bool OSSLDH::decrypt(PrivateKey* /*privateKey*/, const ByteString& /*encryptedData*/,
ByteString& /*data*/, const AsymMech::Type /*padding*/)
{
ERROR_MSG("DH does not support decryption");
return false;
}
// Key factory
bool OSSLDH::generateKeyPair(AsymmetricKeyPair** ppKeyPair, AsymmetricParameters* parameters, RNG* /*rng = NULL */)
{
// Check parameters
if ((ppKeyPair == NULL) ||
(parameters == NULL))
{
return false;
}
if (!parameters->areOfType(DHParameters::type))
{
ERROR_MSG("Invalid parameters supplied for DH key generation");
return false;
}
DHParameters* params = (DHParameters*) parameters;
// Generate the key-pair
DH* dh = DH_new();
if (dh == NULL)
{
ERROR_MSG("Failed to instantiate OpenSSL DH object");
return false;
}
BIGNUM* bn_p = OSSL::byteString2bn(params->getP());
BIGNUM* bn_g = OSSL::byteString2bn(params->getG());
if (!DH_set0_pqg(dh, bn_p, NULL, bn_g))
{
ERROR_MSG("DH set pqg failed (0x%08X)", ERR_get_error());
BN_free(bn_p);
BN_free(bn_g);
DH_free(dh);
return false;
}
if (params->getXBitLength() > 0)
{
if (!DH_set_length(dh, params->getXBitLength()))
{
ERROR_MSG("DH set length failed (0x%08X)", ERR_get_error());
DH_free(dh);
return false;
}
}
if (DH_generate_key(dh) != 1)
{
ERROR_MSG("DH key generation failed (0x%08X)", ERR_get_error());
DH_free(dh);
return false;
}
// Create an asymmetric key-pair object to return
OSSLDHKeyPair* kp = new OSSLDHKeyPair();
((OSSLDHPublicKey*) kp->getPublicKey())->setFromOSSL(dh);
((OSSLDHPrivateKey*) kp->getPrivateKey())->setFromOSSL(dh);
*ppKeyPair = kp;
// Release the key
DH_free(dh);
return true;
}
bool OSSLDH::deriveKey(SymmetricKey **ppSymmetricKey, PublicKey* publicKey, PrivateKey* privateKey)
{
// Check parameters
if ((ppSymmetricKey == NULL) ||
(publicKey == NULL) ||
(privateKey == NULL))
{
return false;
}
// Get keys
DH *pub = ((OSSLDHPublicKey *)publicKey)->getOSSLKey();
DH *priv = ((OSSLDHPrivateKey *)privateKey)->getOSSLKey();
if (pub == NULL || priv == NULL)
{
ERROR_MSG("Failed to get OpenSSL DH keys");
return false;
}
const BIGNUM* bn_pub_key = NULL;
DH_get0_key(pub, &bn_pub_key, NULL);
if (bn_pub_key == NULL)
{
ERROR_MSG("Failed to get OpenSSL DH keys");
return false;
}
// Derive the secret
ByteString secret, derivedSecret;
int size = DH_size(priv);
secret.wipe(size);
derivedSecret.wipe(size);
int keySize = DH_compute_key(&derivedSecret[0], bn_pub_key, priv);
if (keySize <= 0)
{
ERROR_MSG("DH key derivation failed (0x%08X)", ERR_get_error());
return false;
}
// We compensate that OpenSSL removes leading zeros
memcpy(&secret[0] + size - keySize, &derivedSecret[0], keySize);
*ppSymmetricKey = new SymmetricKey(secret.size() * 8);
if (*ppSymmetricKey == NULL)
return false;
if (!(*ppSymmetricKey)->setKeyBits(secret))
{
delete *ppSymmetricKey;
*ppSymmetricKey = NULL;
return false;
}
return true;
}
unsigned long OSSLDH::getMinKeySize()
{
#ifdef WITH_FIPS
// OPENSSL_DH_FIPS_MIN_MODULUS_BITS is 1024
return 1024;
#else
return 512;
#endif
}
unsigned long OSSLDH::getMaxKeySize()
{
return OPENSSL_DH_MAX_MODULUS_BITS;
}
bool OSSLDH::generateParameters(AsymmetricParameters** ppParams, void* parameters /* = NULL */, RNG* /*rng = NULL*/)
{
if ((ppParams == NULL) || (parameters == NULL))
{
return false;
}
size_t bitLen = (size_t) parameters;
if (bitLen < getMinKeySize() || bitLen > getMaxKeySize())
{
ERROR_MSG("This DH key size is not supported");
return false;
}
DH* dh = DH_new();
if (dh == NULL)
{
ERROR_MSG("Failed to create DH object");
return false;
}
if (!DH_generate_parameters_ex(dh, bitLen, 2, NULL))
{
ERROR_MSG("Failed to generate %d bit DH parameters", bitLen);
DH_free(dh);
return false;
}
// Store the DH parameters
DHParameters* params = new DHParameters();
const BIGNUM* bn_p = NULL;
const BIGNUM* bn_g = NULL;
DH_get0_pqg(dh, &bn_p, NULL, &bn_g);
ByteString p = OSSL::bn2ByteString(bn_p); params->setP(p);
ByteString g = OSSL::bn2ByteString(bn_g); params->setG(g);
*ppParams = params;
DH_free(dh);
return true;
}
bool OSSLDH::reconstructKeyPair(AsymmetricKeyPair** ppKeyPair, ByteString& serialisedData)
{
// Check input
if ((ppKeyPair == NULL) ||
(serialisedData.size() == 0))
{
return false;
}
ByteString dPub = ByteString::chainDeserialise(serialisedData);
ByteString dPriv = ByteString::chainDeserialise(serialisedData);
OSSLDHKeyPair* kp = new OSSLDHKeyPair();
bool rv = true;
if (!((DHPublicKey*) kp->getPublicKey())->deserialise(dPub))
{
rv = false;
}
if (!((DHPrivateKey*) kp->getPrivateKey())->deserialise(dPriv))
{
rv = false;
}
if (!rv)
{
delete kp;
return false;
}
*ppKeyPair = kp;
return true;
}
bool OSSLDH::reconstructPublicKey(PublicKey** ppPublicKey, ByteString& serialisedData)
{
// Check input
if ((ppPublicKey == NULL) ||
(serialisedData.size() == 0))
{
return false;
}
OSSLDHPublicKey* pub = new OSSLDHPublicKey();
if (!pub->deserialise(serialisedData))
{
delete pub;
return false;
}
*ppPublicKey = pub;
return true;
}
bool OSSLDH::reconstructPrivateKey(PrivateKey** ppPrivateKey, ByteString& serialisedData)
{
// Check input
if ((ppPrivateKey == NULL) ||
(serialisedData.size() == 0))
{
return false;
}
OSSLDHPrivateKey* priv = new OSSLDHPrivateKey();
if (!priv->deserialise(serialisedData))
{
delete priv;
return false;
}
*ppPrivateKey = priv;
return true;
}
PublicKey* OSSLDH::newPublicKey()
{
return (PublicKey*) new OSSLDHPublicKey();
}
PrivateKey* OSSLDH::newPrivateKey()
{
return (PrivateKey*) new OSSLDHPrivateKey();
}
AsymmetricParameters* OSSLDH::newParameters()
{
return (AsymmetricParameters*) new DHParameters();
}
bool OSSLDH::reconstructParameters(AsymmetricParameters** ppParams, ByteString& serialisedData)
{
// Check input parameters
if ((ppParams == NULL) || (serialisedData.size() == 0))
{
return false;
}
DHParameters* params = new DHParameters();
if (!params->deserialise(serialisedData))
{
delete params;
return false;
}
*ppParams = params;
return true;
}
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