From e6cb02bd0a52457e486a752da5db7b67f2540c16 Mon Sep 17 00:00:00 2001 From: Herbert Xu Date: Fri, 11 Nov 2022 18:05:41 +0800 Subject: [PATCH] crypto: skcipher - Allow sync algorithms with large request contexts Some sync algorithms may require a large amount of temporary space during its operations. There is no reason why they should be limited just because some legacy users want to place all temporary data on the stack. Such algorithms can now set a flag to indicate that they need extra request context, which will cause them to be invisible to users that go through the sync_skcipher interface. Signed-off-by: Herbert Xu --- crypto/skcipher.c | 2 +- include/crypto/internal/skcipher.h | 8 ++++++++ 2 files changed, 9 insertions(+), 1 deletion(-) diff --git a/crypto/skcipher.c b/crypto/skcipher.c index 4182111..0ecab31 100644 --- a/crypto/skcipher.c +++ b/crypto/skcipher.c @@ -763,7 +763,7 @@ struct crypto_sync_skcipher *crypto_alloc_sync_skcipher( struct crypto_skcipher *tfm; /* Only sync algorithms allowed. */ - mask |= CRYPTO_ALG_ASYNC; + mask |= CRYPTO_ALG_ASYNC | CRYPTO_ALG_SKCIPHER_REQSIZE_LARGE; tfm = crypto_alloc_tfm(alg_name, &crypto_skcipher_type, type, mask); diff --git a/include/crypto/internal/skcipher.h b/include/crypto/internal/skcipher.h index a2339f8..2a97540 100644 --- a/include/crypto/internal/skcipher.h +++ b/include/crypto/internal/skcipher.h @@ -14,6 +14,14 @@ #include #include +/* + * Set this if your algorithm is sync but needs a reqsize larger + * than MAX_SYNC_SKCIPHER_REQSIZE. + * + * Reuse bit that is specific to hash algorithms. + */ +#define CRYPTO_ALG_SKCIPHER_REQSIZE_LARGE CRYPTO_ALG_OPTIONAL_KEY + struct aead_request; struct rtattr; -- 2.7.4