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);
}
void newhope_shareda(unsigned char *sharedkey, const poly *sk, const unsigned char *received)
{
poly v,bp, c;
decode_b(&bp, &c, received);
poly_pointwise(&v,sk,&bp);
poly_bitrev(&v);
poly_invntt(&v);
rec(sharedkey, &v, &c);
sha3256(sharedkey, sharedkey, 32);
}
void newhope_shareda(unsigned char *sharedkey, const poly *sk, const unsigned char *received)
{
poly v,bp, c;
decode_b(&bp, &c, received);
poly_pointwise(&v,sk,&bp);
poly_invntt(&v);
rec(sharedkey, &v, &c);
#ifndef STATISTICAL_TEST
sha3256(sharedkey, sharedkey, 32);
#endif
}
void newhope_keygen(unsigned char *send, poly *sk)
{
poly a, e, r, pk;
unsigned char seed[NEWHOPE_SEEDBYTES];
unsigned char noiseseed[32];
randombytes(seed, NEWHOPE_SEEDBYTES);
randombytes(noiseseed, 32);
gen_a(&a, seed); //unsigned
poly_getnoise(sk,noiseseed,0);
poly_ntt(sk); //unsigned
poly_getnoise(&e,noiseseed,1);
poly_ntt(&e); //unsigned
poly_pointwise(&r,sk,&a); //unsigned
poly_add(&pk,&e,&r); //unsigned
encode_a(send, &pk, seed);
}