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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>
This commit is contained in:
Herbert Xu 2023-05-19 16:28:37 +08:00
parent 51d8d6d0f4
commit ed51bba18f
1 changed files with 17 additions and 1 deletions
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18
crypto/cmac.c
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@ -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;