/*---------------------------------------------------------------------------*/
void ecc_gen_private_key(NN_DIGIT *PrivateKey)
{
NN_UINT order_digit_len;
NN_UINT order_bit_len;
char done = FALSE;
uint8_t ri;
NN_DIGIT digit_mask;
order_bit_len = NN_Bits(param.r, NUMWORDS);
order_digit_len = NN_Digits(param.r, NUMWORDS);
while (!done) {
prng((uint8_t *)PrivateKey, order_digit_len * sizeof(NN_Digits));
for (ri = order_digit_len; ri < NUMWORDS; ri++) {
PrivateKey[ri] = 0;
}
if (order_bit_len % NN_DIGIT_BITS != 0) {
digit_mask = MAX_NN_DIGIT >> (NN_DIGIT_BITS - order_bit_len % NN_DIGIT_BITS);
PrivateKey[order_digit_len - 1] = PrivateKey[order_digit_len - 1] & digit_mask;
}
NN_ModSmall(PrivateKey, param.r, NUMWORDS);
if (NN_Zero(PrivateKey, NUMWORDS) != 1) {
done = TRUE;
}
}
/*
* P0 = n * P1
*/
void
ecc_mul ( point_t* P0, point_t* P1, NN_DIGIT* n )
{
int16_t i, tmp;
NN_DIGIT Z0[NUMWORDS];
NN_DIGIT Z1[NUMWORDS];
/* clear point */
p_clear ( P0 );
/* convert to Jprojective coordinate */
NN_AssignZero ( Z0, NUMWORDS );
NN_AssignZero ( Z1, NUMWORDS );
Z1[0] = 0x01;
tmp = NN_Bits ( n, NUMWORDS );
for ( i = tmp-1; i >= 0; i-- )
{
ecc_dbl_proj ( P0, Z0, P0, Z0 );
if ( b_testbit ( n, i ) )
{
#ifdef ADD_MIX
c_add_mix ( P0, Z0, P0, Z0, P1 );
#else
ecc_add_proj ( P0, Z0, P0, Z0, P1, Z1 );
#endif
}
}
/* convert back to affine coordinate */
if ( !Z_is_one ( Z0 ) )
{
NN_ModInv ( Z1, Z0, param.p, NUMWORDS );
NN_ModMultOpt ( Z0, Z1, Z1, param.p, param.omega, NUMWORDS );
NN_ModMultOpt ( P0->x, P0->x, Z0, param.p, param.omega, NUMWORDS );
NN_ModMultOpt ( Z0, Z0, Z1, param.p, param.omega, NUMWORDS );
NN_ModMultOpt ( P0->y, P0->y, Z0, param.p, param.omega, NUMWORDS );
}
}
/**
* \param PrivateKey Must IKE_DH_SCALAR_CONTIKIECC_LEN bytes long
*/
void ecc_gen_private_key ( NN_DIGIT* PrivateKey )
{
srand(NULL);
NN_UINT order_digit_len, order_bit_len;
bool done = FALSE;
uint8_t ri;
NN_DIGIT digit_mask;
order_bit_len = NN_Bits ( param.r, NUMWORDS );
order_digit_len = NN_Digits ( param.r, NUMWORDS );
while ( !done )
{
//PrivateKey[] = { 323FA316 9D8E9C65 93F59476 BC142000 AB5BE0E2 49C43426 };
/*
PrivateKey[24] = 0x0;
PrivateKey[23] = 0x32;
PrivateKey[22] = 0x3F;
PrivateKey[21] = 0xA3;
PrivateKey[20] = 0x16;
PrivateKey[19] = 0x9D;
PrivateKey[18] = 0x8E;
PrivateKey[17] = 0x9C;
PrivateKey[16] = 0x65;
PrivateKey[15] = 0x93;
PrivateKey[14] = 0xF5;
PrivateKey[13] = 0x94;
PrivateKey[12] = 0x76;
PrivateKey[11] = 0xBC;
PrivateKey[10] = 0x14;
PrivateKey[9] = 0x20;
PrivateKey[8] = 0x00;
PrivateKey[7] = 0xAB;
PrivateKey[6] = 0x5B;
PrivateKey[5] = 0xE0;
PrivateKey[4] = 0xE2;
PrivateKey[3] = 0x49;
PrivateKey[2] = 0xC4;
PrivateKey[1] = 0x34;
PrivateKey[0] = 0x26;
*/
for ( ri = 0; ri < order_digit_len; ri++ )
{
#ifdef THIRTYTWO_BIT_PROCESSOR
PrivateKey[ri] = rand32();
#else
PrivateKey[ri] = rand16();
#endif
}
for ( ri = order_digit_len; ri < NUMWORDS; ri++ )
{
PrivateKey[ri] = 0;
}
if ( order_bit_len % NN_DIGIT_BITS != 0 )
{
digit_mask = MAX_NN_DIGIT >> ( NN_DIGIT_BITS - order_bit_len % NN_DIGIT_BITS );
PrivateKey[order_digit_len - 1] = PrivateKey[order_digit_len - 1] & digit_mask;
}
NN_ModSmall ( PrivateKey, param.r, NUMWORDS );
if ( NN_Zero ( PrivateKey, NUMWORDS ) != 1 )
done = TRUE;
}
