linux-kernel - [RFC PATCH HBK: 8/8] dm-crypt: consumer-app setting the flag-is

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Message-Id: <20220905143631.2832-9-pankaj.gupta@nxp.com>
Date:   Mon,  5 Sep 2022 20:06:31 +0530
From:   Pankaj Gupta <pankaj.gupta@....com>
To:     gaurav.jain@....com, sahil.malhotra@....com,
        kshitiz.varshney@....com, horia.geanta@....com,
        linux-kernel@...r.kernel.org, V.Sethi@....com
Cc:     Pankaj Gupta <pankaj.gupta@....com>
Subject: [RFC PATCH HBK: 8/8] dm-crypt: consumer-app setting the flag-is_hbk

Consumer application:
- Adding a flag 'is_hbk', in its "struct crypto_config".

- After fetching the keys, it is setting the above
  mentioned flag, based on the key fetched.
  -- Note: Supported for trusted keys only.

- After allocating the tfm, and before calling
  crypto_xxx_setkey(), setting the tfm flag 'is_hbk':
          cc->cipher_tfm.tfms[i]->base.is_hbk = cc->is_hbk;
  -- Note: Supported for symmetric-key ciphers only.

Signed-off-by: Pankaj Gupta <pankaj.gupta@....com>
---
 drivers/md/dm-crypt.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/md/dm-crypt.c b/drivers/md/dm-crypt.c
index 159c6806c19b..12b400e06cbf 100644
--- a/drivers/md/dm-crypt.c
+++ b/drivers/md/dm-crypt.c
@@ -221,6 +221,7 @@ struct crypt_config {
 	struct mutex bio_alloc_lock;
 
 	u8 *authenc_key; /* space for keys in authenc() format (if used) */
+	unsigned int is_hbk;
 	u8 key[];
 };
 
@@ -2397,10 +2398,12 @@ static int crypt_setkey(struct crypt_config *cc)
 			r = crypto_aead_setkey(cc->cipher_tfm.tfms_aead[i],
 					       cc->key + (i * subkey_size),
 					       subkey_size);
-		else
+		else {
+			cc->cipher_tfm.tfms[i]->base.is_hbk = cc->is_hbk;
 			r = crypto_skcipher_setkey(cc->cipher_tfm.tfms[i],
 						   cc->key + (i * subkey_size),
 						   subkey_size);
+		}
 		if (r)
 			err = r;
 	}
@@ -2461,6 +2464,7 @@ static int set_key_trusted(struct crypt_config *cc, struct key *key)
 	if (!tkp)
 		return -EKEYREVOKED;
 
+	cc->is_hbk = tkp->is_hw_bound;
 	if (cc->key_size != tkp->key_len)
 		return -EINVAL;
 
-- 
2.17.1