Function ccp_gcm_done

freebsd/crypto/ccp/ccp_hardware.c:1830–1861

}

static void
ccp_gcm_done(struct ccp_queue *qp, struct ccp_session *s, void *vcrp,
    int error)
{
	char tag[GMAC_DIGEST_LEN];
	struct cryptop *crp;

	crp = vcrp;

	s->pending--;

	if (error != 0) {
		crp->crp_etype = error;
		goto out;
	}

	/* Encrypt is done.  Decrypt needs to verify tag. */
	if (CRYPTO_OP_IS_ENCRYPT(crp->crp_op))
		goto out;

	/* Copy in message tag. */
	crypto_copydata(crp, crp->crp_digest_start, s->gmac.hash_len, tag);

	/* Verify tag against computed GMAC */
	if (timingsafe_bcmp(tag, s->gmac.final_block, s->gmac.hash_len) != 0)
		crp->crp_etype = EBADMSG;

out:
	explicit_bzero(&s->blkcipher.iv, sizeof(s->blkcipher.iv));
	explicit_bzero(&s->gmac.final_block, sizeof(s->gmac.final_block));
	crypto_done(crp);
}

int __must_check
ccp_gcm(struct ccp_queue *qp, struct ccp_session *s, struct cryptop *crp)