void sc25519_mul()

in sc25519.c [193:212]

• 16 lines of code
• 5 McCabe index (conditional complexity)

void sc25519_mul(sc25519 *r, const sc25519 *x, const sc25519 *y)
{
  int i,j,carry;
  crypto_uint32 t[64];
  for(i=0;i<64;i++)t[i] = 0;

  for(i=0;i<32;i++)
    for(j=0;j<32;j++)
      t[i+j] += x->v[i] * y->v[j];

  /* Reduce coefficients */
  for(i=0;i<63;i++)
  {
    carry = t[i] >> 8;
    t[i+1] += carry;
    t[i] &= 0xff;
  }

  barrett_reduce(r, t);
}