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/*************************************************
* AEP Interface Source File *
* (C) 1999-2006 The Botan Project *
*************************************************/
#include <botan/eng_aep.h>
#include <botan/parsing.h>
#include <botan/util.h>
#include <botan/mutex.h>
#include <botan/aep_conn.h>
#include <botan/hw_aep.h>
#include <botan/es_aep.h>
namespace Botan {
namespace {
/*************************************************
* AEP Exception *
*************************************************/
class AEP_Exception : public Exception
{
public:
AEP_Exception(const std::string func, u32bit retval) :
Exception(func + " failed; returned " + to_string(retval)) {}
};
/*************************************************
* Return the size in bytes of this BigInt *
*************************************************/
u32bit get_bigint_size(void* bigint_ptr, u32bit* bytes)
{
const BigInt* bigint = static_cast<BigInt*>(bigint_ptr);
const u32bit actual_bytes = bigint->bytes();
*bytes = round_up(actual_bytes, 4);
return 0;
}
/*************************************************
* Store a BigInt into AEP format *
*************************************************/
u32bit store_bigint(void* bigint_ptr, u32bit output_size, byte* output)
{
const BigInt* bigint = static_cast<BigInt*>(bigint_ptr);
const u32bit leading_zeros = round_up(bigint->bytes(), 4) - bigint->bytes();
clear_mem(output, output_size);
bigint->binary_encode(output + leading_zeros);
for(u32bit j = 0; j != output_size / 2; j++)
std::swap(output[j], output[output_size-j-1]);
return 0;
}
/*************************************************
* Read a BigInt from the AEP format *
*************************************************/
u32bit create_bigint(void* bigint_ptr, u32bit input_size, byte* input)
{
BigInt* bigint = static_cast<BigInt*>(bigint_ptr);
for(u32bit j = 0; j != input_size / 2; j++)
std::swap(input[j], input[input_size-j-1]);
bigint->binary_decode(input, input_size);
return 0;
}
}
/*************************************************
* AEP Modular Exponentiation Operation *
*************************************************/
BigInt AEP_Engine::pow_mod(const BigInt& i, const BigInt& x, const BigInt& m)
{
BigInt output;
AEP_Connection conn;
u32bit retval = AEP::AEP_ModExp(conn, &i, &x, &m, &output, 0);
if(retval != 0)
throw AEP_Exception("AEP_ModExp", retval);
return output;
}
/*************************************************
* AEP Modular Exponentiation with CRT Operation *
*************************************************/
BigInt AEP_Engine::pow_mod_crt(const BigInt& i, const BigInt&,
const BigInt& p, const BigInt& q,
const BigInt& d1, const BigInt& d2,
const BigInt& c)
{
BigInt output;
AEP_Connection conn;
u32bit retval = AEP::AEP_ModExpCrt(conn, &i, &p, &q, &d1, &d2, &c,
&output, 0);
if(retval != 0)
throw AEP_Exception("AEP_ModExpCrt", retval);
return output;
}
/*************************************************
* AEP RNG Operation *
*************************************************/
u32bit AEP_Engine::get_entropy(byte output[], u32bit length) throw()
{
if(length > 256)
length = 256;
try {
AEP_Connection conn;
u32bit retval = AEP::AEP_GenRandom(conn, length, 1, output, 0);
if(retval != 0)
return 0;
return length;
}
catch(...)
{
return 0;
}
}
/*************************************************
* AEP usability check *
*************************************************/
bool AEP_Engine::ok_to_use(const BigInt& x) throw()
{
if(daemon_is_up && (x.bits() <= AEP::MAX_MODULO_BITS))
return true;
return false;
}
/*************************************************
* AEP daemon status flag *
*************************************************/
bool AEP_Engine::daemon_is_up = false;
/*************************************************
* AEP_Engine Constructor *
*************************************************/
AEP_Engine::AEP_Engine()
{
daemon_is_up = false;
try {
u32bit retval = AEP::AEP_Initialize(0);
if(retval != 0 && retval != AEP::ALREADY_INIT)
throw AEP_Exception("AEP_Initialize", retval);
if(retval == 0)
{
retval = AEP::AEP_SetBNCallBacks(get_bigint_size, store_bigint,
create_bigint);
if(retval != 0)
throw AEP_Exception("AEP_SetBNCallBacks", retval);
AEP_Connection conn;
daemon_is_up = true;
}
}
catch(AEP_Exception&) {}
}
/*************************************************
* AEP_Engine Destructor *
*************************************************/
AEP_Engine::~AEP_Engine()
{
AEP_Connection::close_all_connections();
u32bit retval = AEP::AEP_Finalize();
if(retval != 0)
throw AEP_Exception("AEP_Finalize", retval);
}
/*************************************************
* Gather Entropy from AEP Hardware RNG *
*************************************************/
u32bit AEP_EntropySource::slow_poll(byte output[], u32bit length)
{
return AEP_Engine::get_entropy(output, length);
}
}
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