-rw-r--r-- 811 saferewrite-20241004/src/core_scale3sntrup761/ref/core.c raw
#include "crypto_core.h" #define p 761 #define q 4591 #include "crypto_decode_761xint16.h" #define crypto_decode_pxint16 crypto_decode_761xint16 #include "crypto_encode_761xint16.h" #define crypto_encode_pxint16 crypto_encode_761xint16 #include "crypto_int16.h" typedef crypto_int16 Fq; /* out = 3*in in Rq */ int crypto_core(unsigned char *outbytes,const unsigned char *inbytes,const unsigned char *kbytes,const unsigned char *cbytes) { Fq f[p]; int i; crypto_decode_pxint16(f,inbytes); for (i = 0;i < p;++i) { Fq x = f[i]; x *= 3; /* (-3q+3)/2 ... (3q-3)/2 */ x -= (q+1)/2; /* -2q+1 ... q-2 */ x += q&(x>>15); /* -q+1 ... q-1 */ x += q&(x>>15); /* 0 ... q-1 */ x -= (q-1)/2; /* -(q-1)/2 ... (q-1)/2 */ f[i] = x; } crypto_encode_pxint16(outbytes,f); return 0; }