linux-kernel - [PATCH] crypto: expose needs

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Date:   Mon,  1 Mar 2021 17:59:17 +0100
From:   Christoph Böhmwalder 
        <christoph.boehmwalder@...bit.com>
To:     Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>
Cc:     linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
        Christoph Böhmwalder 
        <christoph.boehmwalder@...bit.com>
Subject: [PATCH] crypto: expose needs_key in procfs

Currently, it is not apparent for userspace users which hash algorithms
require a key and which don't. We have /proc/crypto, so add a field
with this information there.

Signed-off-by: Christoph Böhmwalder <christoph.boehmwalder@...bit.com>

---
 crypto/shash.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/crypto/shash.c b/crypto/shash.c
index 2e3433ad9762..d3127a0618f2 100644
--- a/crypto/shash.c
+++ b/crypto/shash.c
@@ -477,6 +477,9 @@ static void crypto_shash_show(struct seq_file *m, struct crypto_alg *alg)
 	seq_printf(m, "type         : shash\n");
 	seq_printf(m, "blocksize    : %u\n", alg->cra_blocksize);
 	seq_printf(m, "digestsize   : %u\n", salg->digestsize);
+	seq_printf(m, "needs key    : %s\n",
+		   crypto_shash_alg_needs_key(salg) ?
+		   "yes" : "no");
 }
 
 static const struct crypto_type crypto_shash_type = {
-- 
2.26.2