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version 3.0

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Bramfeld Team 2015-08-31 14:01:44 +02:00
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/*
* Copyright (c) 2010-2011 Juli Mallett. 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 AUTHOR AND CONTRIBUTORS ``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 AUTHOR OR CONTRIBUTORS 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.
*/
#include <openssl/evp.h>
#include <openssl/rand.h>
#include <common/factory.h>
#include <crypto/crypto_random.h>
////////////////////////////////////////////////////////////////////////////////
// //
// File: crypto_random_openssl.cc //
// Description: interface to the OpenSSL encryption functions //
// Project: WANProxy XTech //
// Adapted by: Andreu Vidal Bramfeld-Software //
// Last modified: 2015-04-01 //
// //
////////////////////////////////////////////////////////////////////////////////
namespace {
typedef int (RAND_func)(unsigned char *, int);
}
class CryptoRandomSessionRAND : public CryptoRandomSession {
LogHandle log_;
RAND_func *func_;
public:
CryptoRandomSessionRAND(RAND_func *func)
: log_("/crypto/random/session/openssl"),
func_(func)
{ }
~CryptoRandomSessionRAND()
{ }
/*
Action *generate(size_t len, EventCallback *cb)
{
ASSERT(log_, len != 0);
uint8_t bytes[len];
int rv = func_(bytes, sizeof bytes);
if (rv == 0) {
cb->param(Event::Error);
return (cb->schedule());
}
cb->param(Event(Event::Done, Buffer(bytes, sizeof bytes)));
return (cb->schedule());
}
*/
};
class CryptoRandomMethodOpenSSL : public CryptoRandomMethod {
LogHandle log_;
std::map<CryptoRandomType, RAND_func *> func_map_;
public:
CryptoRandomMethodOpenSSL(void)
: log_("/crypto/random/openssl"),
func_map_()
{
OpenSSL_add_all_algorithms();
func_map_[CryptoTypeRNG] = RAND_bytes;
func_map_[CryptoTypePRNG] = RAND_pseudo_bytes;
/* XXX Register. */
}
~CryptoRandomMethodOpenSSL()
{
/* XXX Unregister. */
}
/*
* Synchronous randomness generation. May not succeed.
*/
bool generate(CryptoRandomType func, size_t len, Buffer *out) const
{
std::map<CryptoRandomType, RAND_func *>::const_iterator it;
it = func_map_.find(func);
if (it == func_map_.end())
return (false);
uint8_t bytes[len];
int rv = it->second(bytes, sizeof bytes);
if (rv == 0)
return (false);
out->append(bytes, sizeof bytes);
return (true);
}
CryptoRandomSession *session(CryptoRandomType func) const
{
std::map<CryptoRandomType, RAND_func *>::const_iterator it;
it = func_map_.find(func);
if (it != func_map_.end())
return (new CryptoRandomSessionRAND(it->second));
return (NULL);
}
};
namespace {
static CryptoRandomMethodOpenSSL crypto_random_method_openssl;
}
const CryptoRandomMethod *CryptoRandomMethod::default_method = &crypto_random_method_openssl; /* XXX */