summaryrefslogtreecommitdiff
path: root/crypto/cmac.c
diff options
context:
space:
mode:
authorHerbert Xu <herbert@gondor.apana.org.au>2023-05-19 16:28:37 +0800
committerHerbert Xu <herbert@gondor.apana.org.au>2023-05-24 18:12:33 +0800
commited51bba18f563594b5ddf7aaa5fd61abe5e474ae (patch)
tree28d730184470ad30351b622083f287fad3e96da4 /crypto/cmac.c
parent51d8d6d0f4bedb6a4e9afb20857bb592424de144 (diff)
crypto: cmac - Add support for cloning
Allow cmac to be cloned. The underlying cipher needs to support cloning by not having a cra_init function (all implementations of aes that do not require a fallback can be cloned). Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Acked-by: Ard Biesheuvel <ardb@kernel.org> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto/cmac.c')
-rw-r--r--crypto/cmac.c18
1 files changed, 17 insertions, 1 deletions
diff --git a/crypto/cmac.c b/crypto/cmac.c
index bcc6f19a4f64..fce6b0f58e88 100644
--- a/crypto/cmac.c
+++ b/crypto/cmac.c
@@ -213,7 +213,22 @@ static int cmac_init_tfm(struct crypto_shash *tfm)
ctx->child = cipher;
return 0;
-};
+}
+
+static int cmac_clone_tfm(struct crypto_shash *tfm, struct crypto_shash *otfm)
+{
+ struct cmac_tfm_ctx *octx = crypto_shash_ctx(otfm);
+ struct cmac_tfm_ctx *ctx = crypto_shash_ctx(tfm);
+ struct crypto_cipher *cipher;
+
+ cipher = crypto_clone_cipher(octx->child);
+ if (IS_ERR(cipher))
+ return PTR_ERR(cipher);
+
+ ctx->child = cipher;
+
+ return 0;
+}
static void cmac_exit_tfm(struct crypto_shash *tfm)
{
@@ -280,6 +295,7 @@ static int cmac_create(struct crypto_template *tmpl, struct rtattr **tb)
inst->alg.final = crypto_cmac_digest_final;
inst->alg.setkey = crypto_cmac_digest_setkey;
inst->alg.init_tfm = cmac_init_tfm;
+ inst->alg.clone_tfm = cmac_clone_tfm;
inst->alg.exit_tfm = cmac_exit_tfm;
inst->free = shash_free_singlespawn_instance;