Function AES_GMAC_Update

freebsd/opencrypto/gmac.c:77–113

}

int
AES_GMAC_Update(void *ctx, const void *vdata, u_int len)
{
	struct aes_gmac_ctx *agc;
	const uint8_t *data;
	struct gf128 v;
	uint8_t buf[GMAC_BLOCK_LEN] = {};
	int i;

	agc = ctx;
	data = vdata;
	v = agc->hash;

	while (len > 0) {
		if (len >= 4*GMAC_BLOCK_LEN) {
			i = 4*GMAC_BLOCK_LEN;
			v = gf128_mul4b(v, data, &agc->ghashtbl);
		} else if (len >= GMAC_BLOCK_LEN) {
			i = GMAC_BLOCK_LEN;
			v = gf128_add(v, gf128_read(data));
			v = gf128_mul(v, &agc->ghashtbl.tbls[0]);
		} else {
			i = len;
			bcopy(data, buf, i);
			v = gf128_add(v, gf128_read(&buf[0]));
			v = gf128_mul(v, &agc->ghashtbl.tbls[0]);
			explicit_bzero(buf, sizeof buf);
		}
		len -= i;
		data += i;
	}

	agc->hash = v;
	explicit_bzero(&v, sizeof v);

	return (0);
}

void
AES_GMAC_Final(uint8_t *digest, void *ctx)