peerplays-fc/src/dh.cpp
2012-09-10 23:57:11 -04:00

91 lines
2.8 KiB
C++

#include <fc/dh.hpp>
#include <openssl/dh.h>
namespace fc {
bool diffie_hellman::generate_params( int s, uint8_t g )
{
DH* dh = DH_generate_parameters( s, g, NULL, NULL );
p.resize( BN_num_bytes( dh->p ) );
if( p.size() )
BN_bn2bin( dh->p, (unsigned char*)&p.front() );
this->g = g;
int check;
DH_check(dh,&check);
DH_free(dh);
if( check & DH_CHECK_P_NOT_SAFE_PRIME )
return valid = false;
return valid = true;
}
bool diffie_hellman::validate()
{
if( !p.size() )
return valid = false;
DH* dh = DH_new();
dh->p = BN_bin2bn( (unsigned char*)&p.front(), p.size(), NULL );
dh->g = BN_bin2bn( (unsigned char*)&g, 1, NULL );
int check;
DH_check(dh,&check);
DH_free(dh);
if( check & DH_CHECK_P_NOT_SAFE_PRIME )
return valid = false;
return valid = true;
}
bool diffie_hellman::generate_pub_key()
{
if( !p.size() )
return valid = false;
DH* dh = DH_new();
dh->p = BN_bin2bn( (unsigned char*)&p.front(), p.size(), NULL );
dh->g = BN_bin2bn( (unsigned char*)&g, 1, NULL );
int check;
DH_check(dh,&check);
if( check & DH_CHECK_P_NOT_SAFE_PRIME )
{
DH_free(dh);
return valid = false;
}
DH_generate_key(dh);
pub_key.resize( BN_num_bytes( dh->pub_key ) );
priv_key.resize( BN_num_bytes( dh->priv_key ) );
if( pub_key.size() )
BN_bn2bin( dh->pub_key, (unsigned char*)&pub_key.front() );
if( priv_key.size() )
BN_bn2bin( dh->priv_key, (unsigned char*)&priv_key.front() );
DH_free(dh);
return valid = true;
}
bool diffie_hellman::compute_shared_key( const char* buf, uint32_t s ) {
DH* dh = DH_new();
dh->p = BN_bin2bn( (unsigned char*)&p.front(), p.size(), NULL );
dh->pub_key = BN_bin2bn( (unsigned char*)&pub_key.front(), pub_key.size(), NULL );
dh->priv_key = BN_bin2bn( (unsigned char*)&priv_key.front(), priv_key.size(), NULL );
dh->g = BN_bin2bn( (unsigned char*)&g, 1, NULL );
int check;
DH_check(dh,&check);
if( check & DH_CHECK_P_NOT_SAFE_PRIME )
{
DH_free(dh);
return valid = false;
}
BIGNUM* pk = BN_bin2bn( (unsigned char*)buf, s, NULL );
shared_key.resize( DH_size(dh) );
DH_compute_key( (unsigned char*)&shared_key.front(), pk, dh );
BN_free(pk);
DH_free(dh);
return valid = true;
}
bool diffie_hellman::compute_shared_key( const std::vector<char>& pubk ) {
return compute_shared_key( &pubk.front(), pubk.size() );
}
}