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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.
*/
/*****************************************************************************
OSSLECPrivateKey.cpp
OpenSSL EC private key class
*****************************************************************************/
#include "config.h"
#ifdef WITH_ECC
#include "log.h"
#include "OSSLECPrivateKey.h"
#include "OSSLUtil.h"
#include <openssl/bn.h>
#include <openssl/x509.h>
// Constructors
OSSLECPrivateKey::OSSLECPrivateKey()
{
eckey = EC_KEY_new();
// For PKCS#8 encoding
EC_KEY_set_enc_flags(eckey, EC_PKEY_NO_PUBKEY);
}
OSSLECPrivateKey::OSSLECPrivateKey(const EC_KEY* inECKEY)
{
eckey = EC_KEY_new();
// For PKCS#8 encoding
EC_KEY_set_enc_flags(eckey, EC_PKEY_NO_PUBKEY);
setFromOSSL(inECKEY);
}
// Destructor
OSSLECPrivateKey::~OSSLECPrivateKey()
{
EC_KEY_free(eckey);
}
// The type
/*static*/ const char* OSSLECPrivateKey::type = "OpenSSL EC Private Key";
// Get the base point order length
unsigned long OSSLECPrivateKey::getOrderLength() const
{
const EC_GROUP* grp = EC_KEY_get0_group(eckey);
if (grp != NULL)
{
BIGNUM* order = BN_new();
if (order == NULL)
return 0;
if (!EC_GROUP_get_order(grp, order, NULL))
{
BN_clear_free(order);
return 0;
}
unsigned long len = BN_num_bytes(order);
BN_clear_free(order);
return len;
}
return 0;
}
// Set from OpenSSL representation
void OSSLECPrivateKey::setFromOSSL(const EC_KEY* inECKEY)
{
const EC_GROUP* grp = EC_KEY_get0_group(inECKEY);
if (grp != NULL)
{
ByteString inEC = OSSL::grp2ByteString(grp);
setEC(inEC);
}
const BIGNUM* pk = EC_KEY_get0_private_key(inECKEY);
if (pk != NULL)
{
ByteString inD = OSSL::bn2ByteString(pk);
setD(inD);
}
}
// Check if the key is of the given type
bool OSSLECPrivateKey::isOfType(const char* inType)
{
return !strcmp(type, inType);
}
// Setters for the EC private key components
void OSSLECPrivateKey::setD(const ByteString& inD)
{
ECPrivateKey::setD(inD);
BIGNUM* pk = OSSL::byteString2bn(inD);
EC_KEY_set_private_key(eckey, pk);
BN_clear_free(pk);
}
// Setters for the EC public key components
void OSSLECPrivateKey::setEC(const ByteString& inEC)
{
ECPrivateKey::setEC(inEC);
EC_GROUP* grp = OSSL::byteString2grp(inEC);
EC_KEY_set_group(eckey, grp);
EC_GROUP_free(grp);
}
// Encode into PKCS#8 DER
ByteString OSSLECPrivateKey::PKCS8Encode()
{
ByteString der;
if (eckey == NULL) return der;
EVP_PKEY* pkey = EVP_PKEY_new();
if (pkey == NULL) return der;
if (!EVP_PKEY_set1_EC_KEY(pkey, eckey))
{
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 OSSLECPrivateKey::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;
EC_KEY* key = EVP_PKEY_get1_EC_KEY(pkey);
EVP_PKEY_free(pkey);
if (key == NULL) return false;
setFromOSSL(key);
EC_KEY_free(key);
return true;
}
// Retrieve the OpenSSL representation of the key
EC_KEY* OSSLECPrivateKey::getOSSLKey()
{
return eckey;
}
#endif
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