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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.
*/
/*****************************************************************************
OSSLDHPrivateKey.cpp
OpenSSL Diffie-Hellman private key class
*****************************************************************************/
#include "config.h"
#include "log.h"
#include "OSSLComp.h"
#include "OSSLDHPrivateKey.h"
#include "OSSLUtil.h"
#include <openssl/bn.h>
#include <openssl/x509.h>
#ifdef WITH_FIPS
#include <openssl/fips.h>
#endif
#include <string.h>
// Constructors
OSSLDHPrivateKey::OSSLDHPrivateKey()
{
dh = NULL;
}
OSSLDHPrivateKey::OSSLDHPrivateKey(const DH* inDH)
{
dh = NULL;
setFromOSSL(inDH);
}
// Destructor
OSSLDHPrivateKey::~OSSLDHPrivateKey()
{
DH_free(dh);
}
// The type
/*static*/ const char* OSSLDHPrivateKey::type = "OpenSSL DH Private Key";
// Set from OpenSSL representation
void OSSLDHPrivateKey::setFromOSSL(const DH* inDH)
{
const BIGNUM* bn_p = NULL;
const BIGNUM* bn_g = NULL;
const BIGNUM* bn_priv_key = NULL;
DH_get0_pqg(inDH, &bn_p, NULL, &bn_g);
DH_get0_key(inDH, NULL, &bn_priv_key);
if (bn_p)
{
ByteString inP = OSSL::bn2ByteString(bn_p);
setP(inP);
}
if (bn_g)
{
ByteString inG = OSSL::bn2ByteString(bn_g);
setG(inG);
}
if (bn_priv_key)
{
ByteString inX = OSSL::bn2ByteString(bn_priv_key);
setX(inX);
}
}
// Check if the key is of the given type
bool OSSLDHPrivateKey::isOfType(const char* inType)
{
return !strcmp(type, inType);
}
// Setters for the DH private key components
void OSSLDHPrivateKey::setX(const ByteString& inX)
{
DHPrivateKey::setX(inX);
if (dh)
{
DH_free(dh);
dh = NULL;
}
}
// Setters for the DH public key components
void OSSLDHPrivateKey::setP(const ByteString& inP)
{
DHPrivateKey::setP(inP);
if (dh)
{
DH_free(dh);
dh = NULL;
}
}
void OSSLDHPrivateKey::setG(const ByteString& inG)
{
DHPrivateKey::setG(inG);
if (dh)
{
DH_free(dh);
dh = NULL;
}
}
// Encode into PKCS#8 DER
ByteString OSSLDHPrivateKey::PKCS8Encode()
{
ByteString der;
if (dh == NULL) createOSSLKey();
if (dh == NULL) return der;
EVP_PKEY* pkey = EVP_PKEY_new();
if (pkey == NULL) return der;
if (!EVP_PKEY_set1_DH(pkey, dh))
{
EVP_PKEY_free(pkey);
return der;
}
PKCS8_PRIV_KEY_INFO* p8inf = EVP_PKEY2PKCS8(pkey);
EVP_PKEY_free(pkey);
if (p8inf == NULL) return der;
int len = i2d_PKCS8_PRIV_KEY_INFO(p8inf, NULL);
if (len < 0)
{
PKCS8_PRIV_KEY_INFO_free(p8inf);
return der;
}
der.resize(len);
unsigned char* priv = &der[0];
int len2 = i2d_PKCS8_PRIV_KEY_INFO(p8inf, &priv);
PKCS8_PRIV_KEY_INFO_free(p8inf);
if (len2 != len) der.wipe();
return der;
}
// Decode from PKCS#8 BER
bool OSSLDHPrivateKey::PKCS8Decode(const ByteString& ber)
{
int len = ber.size();
if (len <= 0) return false;
const unsigned char* priv = ber.const_byte_str();
PKCS8_PRIV_KEY_INFO* p8 = d2i_PKCS8_PRIV_KEY_INFO(NULL, &priv, len);
if (p8 == NULL) return false;
EVP_PKEY* pkey = EVP_PKCS82PKEY(p8);
PKCS8_PRIV_KEY_INFO_free(p8);
if (pkey == NULL) return false;
DH* key = EVP_PKEY_get1_DH(pkey);
EVP_PKEY_free(pkey);
if (key == NULL) return false;
setFromOSSL(key);
DH_free(key);
return true;
}
// Retrieve the OpenSSL representation of the key
DH* OSSLDHPrivateKey::getOSSLKey()
{
if (dh == NULL) createOSSLKey();
return dh;
}
// Create the OpenSSL representation of the key
void OSSLDHPrivateKey::createOSSLKey()
{
if (dh != NULL) return;
BN_CTX *ctx = BN_CTX_new();
if (ctx == NULL)
{
ERROR_MSG("Could not create BN_CTX");
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_priv_key = OSSL::byteString2bn(x);
BIGNUM* bn_pub_key = BN_new();
BN_mod_exp(bn_pub_key, bn_g, bn_priv_key, bn_p, ctx);
BN_CTX_free(ctx);
DH_set0_pqg(dh, bn_p, NULL, bn_g);
DH_set0_key(dh, bn_pub_key, bn_priv_key);
}
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