-rw-r--r-- 516 saferewrite-20240622/src/encode_761xfreeze3/ref/encode.c raw
#include "crypto_encode.h" #include "crypto_int16.h" #define int16 crypto_int16 #define p 761 /* valid inputs: -16384 <= x < 16384 */ /* then 3 divides x-F3_freeze(x) */ /* and F3_freeze(x) is in {-1,0,1} */ /* all inputs: 3 divides x-F3_freeze(x) */ /* and F3_freeze(x) is in {-2,-1,0,1,2} */ static inline char F3_freeze(int16 x) { return x-3*((10923*x+16384)>>15); } void crypto_encode(unsigned char *s,const void *v) { const int16 *r = v; int i; for (i = 0;i < p;++i) s[i] = F3_freeze(r[i]); }