drivers/crypto/omap-aes-gcm.c

Source file repositories/reference/linux-study-clean/drivers/crypto/omap-aes-gcm.c

File Facts

System
Linux kernel
Corpus path
drivers/crypto/omap-aes-gcm.c
Extension
.c
Size
9398 bytes
Lines
388
Domain
Driver Families
Bucket
drivers/crypto
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

if (tag[i]) {
				ret = -EBADMSG;
			}
		}
	}

	omap_aes_gcm_finish_req(dd, ret);
}

static int omap_aes_gcm_copy_buffers(struct omap_aes_dev *dd,
				     struct aead_request *req)
{
	int alen, clen, cryptlen, assoclen, ret;
	struct crypto_aead *aead = crypto_aead_reqtfm(req);
	unsigned int authlen = crypto_aead_authsize(aead);
	struct scatterlist *tmp, sg_arr[2];
	int nsg;
	u16 flags;

	assoclen = req->assoclen;
	cryptlen = req->cryptlen;

	if (dd->flags & FLAGS_RFC4106_GCM)
		assoclen -= 8;

	if (!(dd->flags & FLAGS_ENCRYPT))
		cryptlen -= authlen;

	alen = ALIGN(assoclen, AES_BLOCK_SIZE);
	clen = ALIGN(cryptlen, AES_BLOCK_SIZE);

	nsg = !!(assoclen && cryptlen);

	omap_aes_clear_copy_flags(dd);

	sg_init_table(dd->in_sgl, nsg + 1);
	if (assoclen) {
		tmp = req->src;
		ret = omap_crypto_align_sg(&tmp, assoclen,
					   AES_BLOCK_SIZE, dd->in_sgl,
					   OMAP_CRYPTO_COPY_DATA |
					   OMAP_CRYPTO_ZERO_BUF |
					   OMAP_CRYPTO_FORCE_SINGLE_ENTRY,
					   FLAGS_ASSOC_DATA_ST_SHIFT,
					   &dd->flags);
		if (ret)
			return ret;
	}

	if (cryptlen) {
		tmp = scatterwalk_ffwd(sg_arr, req->src, req->assoclen);

		if (nsg)
			sg_unmark_end(dd->in_sgl);

		ret = omap_crypto_align_sg(&tmp, cryptlen,
					   AES_BLOCK_SIZE, &dd->in_sgl[nsg],
					   OMAP_CRYPTO_COPY_DATA |
					   OMAP_CRYPTO_ZERO_BUF |
					   OMAP_CRYPTO_FORCE_SINGLE_ENTRY,
					   FLAGS_IN_DATA_ST_SHIFT,
					   &dd->flags);
		if (ret)
			return ret;
	}

	dd->in_sg = dd->in_sgl;
	dd->total = cryptlen;
	dd->assoc_len = assoclen;
	dd->authsize = authlen;

	dd->out_sg = req->dst;
	dd->orig_out = req->dst;

	dd->out_sg = scatterwalk_ffwd(sg_arr, req->dst, req->assoclen);

	flags = 0;
	if (req->src == req->dst || dd->out_sg == sg_arr)
		flags |= OMAP_CRYPTO_FORCE_COPY;

	if (cryptlen) {
		ret = omap_crypto_align_sg(&dd->out_sg, cryptlen,
					   AES_BLOCK_SIZE, &dd->out_sgl,
					   flags,
					   FLAGS_OUT_DATA_ST_SHIFT, &dd->flags);
		if (ret)
			return ret;
	}

	dd->in_sg_len = sg_nents_for_len(dd->in_sg, alen + clen);

Annotation

Implementation Notes