Function ccp_sha

freebsd/crypto/ccp/ccp_hardware.c:1073–1137

}

static int __must_check
ccp_sha(struct ccp_queue *qp, enum sha_version version, struct sglist *sgl_src,
    struct sglist *sgl_dst, const struct ccp_completion_ctx *cctx)
{
	const struct SHA_Defn *defn;
	struct sglist_seg *seg;
	size_t i, msgsize, remaining, nb;
	uint32_t lsbaddr;
	int error;

	for (i = 0; i < nitems(SHA_definitions); i++)
		if (SHA_definitions[i].version == version)
			break;
	if (i == nitems(SHA_definitions))
		return (EINVAL);
	defn = &SHA_definitions[i];

	/* XXX validate input ??? */

	/* Load initial SHA state into LSB */
	/* XXX ensure H_vectors don't span page boundaries */
	error = ccp_passthrough(qp, ccp_queue_lsb_address(qp, LSB_ENTRY_SHA),
	    CCP_MEMTYPE_SB, pmap_kextract((vm_offset_t)defn->H_vectors),
	    CCP_MEMTYPE_SYSTEM, roundup2(defn->H_size, LSB_ENTRY_SIZE),
	    CCP_PASSTHRU_BYTESWAP_NOOP, CCP_PASSTHRU_BITWISE_NOOP, false,
	    NULL);
	if (error != 0)
		return (error);

	/* Execute series of SHA updates on correctly sized buffers */
	msgsize = 0;
	for (i = 0; i < sgl_src->sg_nseg; i++) {
		seg = &sgl_src->sg_segs[i];
		msgsize += seg->ss_len;
		error = ccp_sha_single_desc(qp, defn, seg->ss_paddr,
		    seg->ss_len, i == 0, i == sgl_src->sg_nseg - 1,
		    msgsize << 3);
		if (error != 0)
			return (error);
	}

	/* Copy result out to sgl_dst */
	remaining = roundup2(defn->H_size, LSB_ENTRY_SIZE);
	lsbaddr = ccp_queue_lsb_address(qp, LSB_ENTRY_SHA);
	for (i = 0; i < sgl_dst->sg_nseg; i++) {
		seg = &sgl_dst->sg_segs[i];
		/* crp lengths are int, so 32-bit min() is ok. */
		nb = min(remaining, seg->ss_len);

		error = ccp_passthrough(qp, seg->ss_paddr, CCP_MEMTYPE_SYSTEM,
		    lsbaddr, CCP_MEMTYPE_SB, nb, CCP_PASSTHRU_BYTESWAP_NOOP,
		    CCP_PASSTHRU_BITWISE_NOOP,
		    (cctx != NULL) ? (nb == remaining) : false,
		    (nb == remaining) ? cctx : NULL);
		if (error != 0)
			return (error);

		remaining -= nb;