Validated assoclen for RFC4543 which expects an assoclen
of 16 or 20, the same as RFC4106.
Based on seqiv, IPsec ESP and RFC4543/RFC4106 the assoclen is sizeof
IP Header (spi, seq_no, extended seq_no) and IV len. This can be 16 or
20 bytes.
Signed-off-by: Iuliana Prodan <iuliana.prodan@xxxxxxx>
---
drivers/crypto/bcm/cipher.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/drivers/crypto/bcm/cipher.c b/drivers/crypto/bcm/cipher.c
index d972ffa..02ef600 100644
--- a/drivers/crypto/bcm/cipher.c
+++ b/drivers/crypto/bcm/cipher.c
@@ -2640,6 +2640,19 @@ static int aead_need_fallback(struct aead_request *req)
return 1;
}
+ /*
+ * RFC4106 and RFC4543 cannot handle the case where AAD is other than
+ * 16 or 20 bytes long. So use fallback in this case.
+ */
+ if (ctx->cipher.mode == CIPHER_MODE_GCM &&
+ ctx->cipher.alg == CIPHER_ALG_AES &&
+ rctx->iv_ctr_len == GCM_RFC4106_IV_SIZE &&
+ req->assoclen != 16 && req->assoclen != 20) {
+ flow_log("RFC4106/RFC4543 needs fallback for assoclen"
+ " other than 16 or 20 bytes\n");
+ return 1;
+ }
+
payload_len = req->cryptlen;
if (spu->spu_type == SPU_TYPE_SPUM)
payload_len += req->assoclen;
--
2.1.0
