crypto: omap-sham - add support for export/import

Now that the driver has been converted to use scatterlists for data
handling, add proper implementation for the export/import stubs also.

Signed-off-by: Tero Kristo <t-kristo@ti.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/omap-sham.c

@@ -1418,12 +1418,21 @@ static void omap_sham_cra_exit(struct crypto_tfm *tfm)
 
 static int omap_sham_export(struct ahash_request *req, void *out)
 {
-	return -ENOTSUPP;
+	struct omap_sham_reqctx *rctx = ahash_request_ctx(req);
+
+	memcpy(out, rctx, sizeof(*rctx) + rctx->bufcnt);
+
+	return 0;
 }
 
 static int omap_sham_import(struct ahash_request *req, const void *in)
 {
-	return -ENOTSUPP;
+	struct omap_sham_reqctx *rctx = ahash_request_ctx(req);
+	const struct omap_sham_reqctx *ctx_in = in;
+
+	memcpy(rctx, in, sizeof(*rctx) + ctx_in->bufcnt);
+
+	return 0;
 }
 
 static struct ahash_alg algs_sha1_md5[] = {
@@ -2083,7 +2092,8 @@ static int omap_sham_probe(struct platform_device *pdev)
 			alg = &dd->pdata->algs_info[i].algs_list[j];
 			alg->export = omap_sham_export;
 			alg->import = omap_sham_import;
-			alg->halg.statesize = sizeof(struct omap_sham_reqctx);
+			alg->halg.statesize = sizeof(struct omap_sham_reqctx) +
+					      BUFLEN;
 			err = crypto_register_ahash(alg);
 			if (err)
 				goto err_algs;