ed25519/fe.h

   1 #ifndef FE_H
   2 #define FE_H
   3
   4 #include "fixedint.h"
   5
   6
   7 /*
   8     fe means field element.
   9     Here the field is \Z/(2^255-19).
  10     An element t, entries t[0]...t[9], represents the integer
  11     t[0]+2^26 t[1]+2^51 t[2]+2^77 t[3]+2^102 t[4]+...+2^230 t[9].
  12     Bounds on each t[i] vary depending on context.
  13 */
  14
  15
  16 typedef int32_t fe[10];
  17
  18
  19 void fe_0(fe h);
  20 void fe_1(fe h);
  21
  22 void fe_frombytes(fe h, const unsigned char *s);
  23 void fe_tobytes(unsigned char *s, const fe h);
  24
  25 void fe_copy(fe h, const fe f);
  26 int fe_isnegative(const fe f);
  27 int fe_isnonzero(const fe f);
  28 void fe_cmov(fe f, const fe g, unsigned int b);
  29 void fe_cswap(fe f, fe g, unsigned int b);
  30
  31 void fe_neg(fe h, const fe f);
  32 void fe_add(fe h, const fe f, const fe g);
  33 void fe_invert(fe out, const fe z);
  34 void fe_sq(fe h, const fe f);
  35 void fe_sq2(fe h, const fe f);
  36 void fe_mul(fe h, const fe f, const fe g);
  37 void fe_mul121666(fe h, fe f);
  38 void fe_pow22523(fe out, const fe z);
  39 void fe_sub(fe h, const fe f, const fe g);
  40
  41 #endif