void newhope_sharedb(unsigned char *sharedkey, unsigned char *send, const unsigned char *received)
{
poly sp, ep, v, a, pka, c, epp, bp;
unsigned char seed[NEWHOPE_SEEDBYTES];
unsigned char noiseseed[32];
randombytes(noiseseed, 32);
decode_a(&pka, seed, received);
gen_a(&a, seed);
poly_getnoise(&sp,noiseseed,0);
poly_ntt(&sp);
poly_getnoise(&ep,noiseseed,1);
poly_ntt(&ep);
poly_pointwise(&bp, &a, &sp);
poly_add(&bp, &bp, &ep);
poly_pointwise(&v, &pka, &sp);
poly_bitrev(&v);
poly_invntt(&v);
poly_getnoise(&epp,noiseseed,2);
poly_add(&v, &v, &epp);
helprec(&c, &v, noiseseed, 3);
encode_b(send, &bp, &c);
rec(sharedkey, &v, &c);
sha3256(sharedkey, sharedkey, 32);
}
int encode_inter(
pbs_attribute *attr, /* ptr to pbs_attribute */
tlist_head *phead, /* head of pbs_attribute list */
const char *atname, /* pbs_attribute name */
const char *rsname, /* resource name or null */
int mode, /* encode mode, unused here */
int perm) /* only used for resources */
{
if (mode == ATR_ENCODE_CLIENT)
return (encode_b(attr, phead, atname, rsname, mode, perm));
else
return (encode_l(attr, phead, atname, rsname, mode, perm));
}
