- /* construct cipher/plaintext */
- if (enc)
- memset(rctx->auth_tag, 0, authsize);
- else
- scatterwalk_map_and_copy(rctx->auth_tag, src,
- req->cryptlen - authsize,
- authsize, 0);
-
- sg_init_one(cipher, rctx->auth_tag, authsize);
-
- /* construct the aad */
- srcp = sg_page(src);
- vsrc = PageHighMem(srcp) ? NULL : page_address(srcp) + src->offset;
-
- sg_init_table(payload, 2);
- sg_set_buf(payload, req->iv, 8);
- scatterwalk_crypto_chain(payload, src, vsrc == req->iv + 8, 2);
- assoclen += 8 + req->cryptlen - (enc ? 0 : authsize);
-
- if (req->assoc->length == req->assoclen) {
- sg_init_table(assoc, 2);
- sg_set_page(assoc, sg_page(req->assoc), req->assoc->length,
- req->assoc->offset);
- } else {
- BUG_ON(req->assoclen > sizeof(rctx->assocbuf));
-
- scatterwalk_map_and_copy(rctx->assocbuf, req->assoc, 0,
- req->assoclen, 0);
-
- sg_init_table(assoc, 2);
- sg_set_buf(assoc, rctx->assocbuf, req->assoclen);
- }
- scatterwalk_crypto_chain(assoc, payload, 0, 2);
-