netdev - [PATCH 6/6] crypto: cryptd - Add support for cloning hashes

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Date:   Thu, 13 Apr 2023 14:24:25 +0800
From:   "Herbert Xu" <herbert@...dor.apana.org.au>
To:     Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        David Ahern <dsahern@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Dmitry Safonov <dima@...sta.com>,
        Andy Lutomirski <luto@...capital.net>,
        Ard Biesheuvel <ardb@...nel.org>,
        Bob Gilligan <gilligan@...sta.com>,
        Dan Carpenter <error27@...il.com>,
        David Laight <David.Laight@...lab.com>,
        Dmitry Safonov <0x7f454c46@...il.com>,
        Eric Biggers <ebiggers@...nel.org>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Francesco Ruggeri <fruggeri05@...il.com>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        Ivan Delalande <colona@...sta.com>,
        Leonard Crestez <cdleonard@...il.com>,
        Salam Noureddine <noureddine@...sta.com>,
        netdev@...r.kernel.org
Subject: [PATCH 6/6] crypto: cryptd - Add support for cloning hashes

Allow cryptd hashes to be cloned.  The underlying hash will be cloned.

Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
---

 crypto/cryptd.c |   16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/crypto/cryptd.c b/crypto/cryptd.c
index 43ce347ccba0..bbcc368b6a55 100644
--- a/crypto/cryptd.c
+++ b/crypto/cryptd.c
@@ -446,6 +446,21 @@ static int cryptd_hash_init_tfm(struct crypto_ahash *tfm)
 	return 0;
 }
 
+static int cryptd_hash_clone_tfm(struct crypto_ahash *ntfm,
+				 struct crypto_ahash *tfm)
+{
+	struct cryptd_hash_ctx *nctx = crypto_ahash_ctx(ntfm);
+	struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(tfm);
+	struct crypto_shash *hash;
+
+	hash = crypto_clone_shash(ctx->child);
+	if (IS_ERR(hash))
+		return PTR_ERR(hash);
+
+	nctx->child = hash;
+	return 0;
+}
+
 static void cryptd_hash_exit_tfm(struct crypto_ahash *tfm)
 {
 	struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(tfm);
@@ -678,6 +693,7 @@ static int cryptd_create_hash(struct crypto_template *tmpl, struct rtattr **tb,
 	inst->alg.halg.base.cra_ctxsize = sizeof(struct cryptd_hash_ctx);
 
 	inst->alg.init_tfm = cryptd_hash_init_tfm;
+	inst->alg.clone_tfm = cryptd_hash_clone_tfm;
 	inst->alg.exit_tfm = cryptd_hash_exit_tfm;
 
 	inst->alg.init   = cryptd_hash_init_enqueue;