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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.
*/
/*****************************************************************************
OSSLDHPublicKey.cpp
OpenSSL Diffie-Hellman public key class
*****************************************************************************/
#include "config.h"
#include "log.h"
#include "OSSLComp.h"
#include "OSSLDHPublicKey.h"
#include "OSSLUtil.h"
#include <openssl/bn.h>
#ifdef WITH_FIPS
#include <openssl/fips.h>
#endif
#include <string.h>
// Constructors
OSSLDHPublicKey::OSSLDHPublicKey()
{
dh = NULL;
}
OSSLDHPublicKey::OSSLDHPublicKey(const DH* inDH)
{
dh = NULL;
setFromOSSL(inDH);
}
// Destructor
OSSLDHPublicKey::~OSSLDHPublicKey()
{
DH_free(dh);
}
// The type
/*static*/ const char* OSSLDHPublicKey::type = "OpenSSL DH Public Key";
// Set from OpenSSL representation
void OSSLDHPublicKey::setFromOSSL(const DH* inDH)
{
const BIGNUM* bn_p = NULL;
const BIGNUM* bn_g = NULL;
const BIGNUM* bn_pub_key = NULL;
DH_get0_pqg(inDH, &bn_p, NULL, &bn_g);
DH_get0_key(inDH, &bn_pub_key, NULL);
if (bn_p)
{
ByteString inP = OSSL::bn2ByteString(bn_p);
setP(inP);
}
if (bn_g)
{
ByteString inG = OSSL::bn2ByteString(bn_g);
setG(inG);
}
if (bn_pub_key)
{
ByteString inY = OSSL::bn2ByteString(bn_pub_key);
setY(inY);
}
}
// Check if the key is of the given type
bool OSSLDHPublicKey::isOfType(const char* inType)
{
return !strcmp(type, inType);
}
// Setters for the DH public key components
void OSSLDHPublicKey::setP(const ByteString& inP)
{
DHPublicKey::setP(inP);
if (dh)
{
DH_free(dh);
dh = NULL;
}
}
void OSSLDHPublicKey::setG(const ByteString& inG)
{
DHPublicKey::setG(inG);
if (dh)
{
DH_free(dh);
dh = NULL;
}
}
void OSSLDHPublicKey::setY(const ByteString& inY)
{
DHPublicKey::setY(inY);
if (dh)
{
DH_free(dh);
dh = NULL;
}
}
// Retrieve the OpenSSL representation of the key
DH* OSSLDHPublicKey::getOSSLKey()
{
if (dh == NULL) createOSSLKey();
return dh;
}
// Create the OpenSSL representation of the key
void OSSLDHPublicKey::createOSSLKey()
{
if (dh != NULL) return;
dh = DH_new();
if (dh == NULL)
{
ERROR_MSG("Could not create DH object");
return;
}
// Use the OpenSSL implementation and not any engine
#if OPENSSL_VERSION_NUMBER < 0x10100000L || defined(LIBRESSL_VERSION_NUMBER)
#ifdef WITH_FIPS
if (FIPS_mode())
DH_set_method(dh, FIPS_dh_openssl());
else
DH_set_method(dh, DH_OpenSSL());
#else
DH_set_method(dh, DH_OpenSSL());
#endif
#else
DH_set_method(dh, DH_OpenSSL());
#endif
BIGNUM* bn_p = OSSL::byteString2bn(p);
BIGNUM* bn_g = OSSL::byteString2bn(g);
BIGNUM* bn_pub_key = OSSL::byteString2bn(y);
DH_set0_pqg(dh, bn_p, NULL, bn_g);
DH_set0_key(dh, bn_pub_key, NULL);
}
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