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 42