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/*************************************************
* PK Algorithm Core Source File *
* (C) 1999-2008 The Botan Project *
*************************************************/
#include <botan/pk_core.h>
#include <botan/numthry.h>
#include <botan/engine.h>
#include <botan/config.h>
#include <algorithm>
namespace Botan {
namespace {
/*************************************************
* Return a new blinding factor *
*************************************************/
BigInt blinding_factor(u32bit modulus_size)
{
const u32bit BLINDING_BITS =
global_config().option_as_u32bit("pk/blinder_size");
if(BLINDING_BITS == 0)
return 0;
return random_integer(std::min(modulus_size - 1, BLINDING_BITS));
}
}
/*************************************************
* IF_Core Constructor *
*************************************************/
IF_Core::IF_Core(const BigInt& e, const BigInt& n, const BigInt& d,
const BigInt& p, const BigInt& q,
const BigInt& d1, const BigInt& d2, const BigInt& c)
{
op = Engine_Core::if_op(e, n, d, p, q, d1, d2, c);
if(d != 0)
{
BigInt k = blinding_factor(n.bits());
if(k != 0)
blinder = Blinder(power_mod(k, e, n), inverse_mod(k, n), n);
}
}
/*************************************************
* IF_Core Copy Constructor *
*************************************************/
IF_Core::IF_Core(const IF_Core& core)
{
op = 0;
if(core.op)
op = core.op->clone();
blinder = core.blinder;
}
/*************************************************
* IF_Core Assignment Operator *
*************************************************/
IF_Core& IF_Core::operator=(const IF_Core& core)
{
delete op;
if(core.op)
op = core.op->clone();
blinder = core.blinder;
return (*this);
}
/*************************************************
* IF Public Operation *
*************************************************/
BigInt IF_Core::public_op(const BigInt& i) const
{
return op->public_op(i);
}
/*************************************************
* IF Private Operation *
*************************************************/
BigInt IF_Core::private_op(const BigInt& i) const
{
return blinder.unblind(op->private_op(blinder.blind(i)));
}
/*************************************************
* DSA_Core Constructor *
*************************************************/
DSA_Core::DSA_Core(const DL_Group& group, const BigInt& y, const BigInt& x)
{
op = Engine_Core::dsa_op(group, y, x);
}
/*************************************************
* DSA_Core Copy Constructor *
*************************************************/
DSA_Core::DSA_Core(const DSA_Core& core)
{
op = 0;
if(core.op)
op = core.op->clone();
}
/*************************************************
* DSA_Core Assignment Operator *
*************************************************/
DSA_Core& DSA_Core::operator=(const DSA_Core& core)
{
delete op;
if(core.op)
op = core.op->clone();
return (*this);
}
/*************************************************
* DSA Verification Operation *
*************************************************/
bool DSA_Core::verify(const byte msg[], u32bit msg_length,
const byte sig[], u32bit sig_length) const
{
return op->verify(msg, msg_length, sig, sig_length);
}
/*************************************************
* DSA Signature Operation *
*************************************************/
SecureVector<byte> DSA_Core::sign(const byte in[], u32bit length,
const BigInt& k) const
{
return op->sign(in, length, k);
}
/*************************************************
* NR_Core Constructor *
*************************************************/
NR_Core::NR_Core(const DL_Group& group, const BigInt& y, const BigInt& x)
{
op = Engine_Core::nr_op(group, y, x);
}
/*************************************************
* NR_Core Copy Constructor *
*************************************************/
NR_Core::NR_Core(const NR_Core& core)
{
op = 0;
if(core.op)
op = core.op->clone();
}
/*************************************************
* NR_Core Assignment Operator *
*************************************************/
NR_Core& NR_Core::operator=(const NR_Core& core)
{
delete op;
if(core.op)
op = core.op->clone();
return (*this);
}
/*************************************************
* NR Verification Operation *
*************************************************/
SecureVector<byte> NR_Core::verify(const byte in[], u32bit length) const
{
return op->verify(in, length);
}
/*************************************************
* NR Signature Operation *
*************************************************/
SecureVector<byte> NR_Core::sign(const byte in[], u32bit length,
const BigInt& k) const
{
return op->sign(in, length, k);
}
/*************************************************
* ELG_Core Constructor *
*************************************************/
ELG_Core::ELG_Core(const DL_Group& group, const BigInt& y, const BigInt& x)
{
op = Engine_Core::elg_op(group, y, x);
p_bytes = 0;
if(x != 0)
{
const BigInt& p = group.get_p();
p_bytes = group.get_p().bytes();
BigInt k = blinding_factor(p.bits());
if(k != 0)
blinder = Blinder(k, power_mod(k, x, p), p);
}
}
/*************************************************
* ELG_Core Copy Constructor *
*************************************************/
ELG_Core::ELG_Core(const ELG_Core& core)
{
op = 0;
if(core.op)
op = core.op->clone();
blinder = core.blinder;
p_bytes = core.p_bytes;
}
/*************************************************
* ELG_Core Assignment Operator *
*************************************************/
ELG_Core& ELG_Core::operator=(const ELG_Core& core)
{
delete op;
if(core.op)
op = core.op->clone();
blinder = core.blinder;
p_bytes = core.p_bytes;
return (*this);
}
/*************************************************
* ElGamal Encrypt Operation *
*************************************************/
SecureVector<byte> ELG_Core::encrypt(const byte in[], u32bit length,
const BigInt& k) const
{
return op->encrypt(in, length, k);
}
/*************************************************
* ElGamal Decrypt Operation *
*************************************************/
SecureVector<byte> ELG_Core::decrypt(const byte in[], u32bit length) const
{
if(length != 2*p_bytes)
throw Invalid_Argument("ELG_Core::decrypt: Invalid message");
BigInt a(in, p_bytes);
BigInt b(in + p_bytes, p_bytes);
return BigInt::encode(blinder.unblind(op->decrypt(blinder.blind(a), b)));
}
/*************************************************
* DH_Core Constructor *
*************************************************/
DH_Core::DH_Core(const DL_Group& group, const BigInt& x)
{
op = Engine_Core::dh_op(group, x);
const BigInt& p = group.get_p();
BigInt k = blinding_factor(p.bits());
if(k != 0)
blinder = Blinder(k, power_mod(inverse_mod(k, p), x, p), p);
}
/*************************************************
* DH_Core Copy Constructor *
*************************************************/
DH_Core::DH_Core(const DH_Core& core)
{
op = 0;
if(core.op)
op = core.op->clone();
blinder = core.blinder;
}
/*************************************************
* DH_Core Assignment Operator *
*************************************************/
DH_Core& DH_Core::operator=(const DH_Core& core)
{
delete op;
if(core.op)
op = core.op->clone();
blinder = core.blinder;
return (*this);
}
/*************************************************
* DH Operation *
*************************************************/
BigInt DH_Core::agree(const BigInt& i) const
{
return blinder.unblind(op->agree(blinder.blind(i)));
}
}
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