If the gcm cipher used by rfc4543 does not complete request immediately,
the authentication tag is not copied to destination buffer. Patch adds
correct async logic for this case.
Signed-off-by: Jussi Kivilinna <jussi.kivilinna@xxxxxx>
---
crypto/gcm.c | 19 +++++++++++++++++--
1 file changed, 17 insertions(+), 2 deletions(-)
diff --git a/crypto/gcm.c b/crypto/gcm.c
index 4ff2139..b0d3cb1 100644
--- a/crypto/gcm.c
+++ b/crypto/gcm.c
@@ -1099,6 +1099,21 @@ static int crypto_rfc4543_setauthsize(struct crypto_aead *parent,
return crypto_aead_setauthsize(ctx->child, authsize);
}
+static void crypto_rfc4543_done(struct crypto_async_request *areq, int err)
+{
+ struct aead_request *req = areq->data;
+ struct crypto_aead *aead = crypto_aead_reqtfm(req);
+ struct crypto_rfc4543_req_ctx *rctx = crypto_rfc4543_reqctx(req);
+
+ if (!err) {
+ scatterwalk_map_and_copy(rctx->auth_tag, req->dst,
+ req->cryptlen,
+ crypto_aead_authsize(aead), 1);
+ }
+
+ aead_request_complete(req, err);
+}
+
static struct aead_request *crypto_rfc4543_crypt(struct aead_request *req,
bool enc)
{
@@ -1145,8 +1160,8 @@ static struct aead_request *crypto_rfc4543_crypt(struct aead_request *req,
scatterwalk_crypto_chain(assoc, payload, 0, 2);
aead_request_set_tfm(subreq, ctx->child);
- aead_request_set_callback(subreq, req->base.flags, req->base.complete,
- req->base.data);
+ aead_request_set_callback(subreq, req->base.flags, crypto_rfc4543_done,
+ req);
aead_request_set_crypt(subreq, cipher, cipher, enc ? 0 : authsize, iv);
aead_request_set_assoc(subreq, assoc, assoclen);
--
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