linux-kernel - [PATCH v7 5/5] crypto: add flag for unstable encoding

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Date:   Fri, 13 Apr 2018 17:48:40 +0200
From:   Benjamin Warnke <4bwarnke@...ormatik.uni-hamburg.de>
To:     linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
        herbert@...dor.apana.org.au, davem@...emloft.net,
        minchan@...nel.org, sergey.senozhatsky.work@...il.com,
        ngupta@...are.org, pombredanne@...b.com, ebiggers3@...il.com,
        smueller@...onox.de
Cc:     Benjamin Warnke <4bwarnke@...ormatik.uni-hamburg.de>
Subject: [PATCH v7 5/5] crypto: add flag for unstable encoding

The data-format of zBeWalgo, and some other algorithms is unstable. To
identify such unstable algorithms this patch adds a new flag to the
crypto-api.

Signed-off-by: Benjamin Warnke <4bwarnke@...ormatik.uni-hamburg.de>
---
 crypto/zbewalgo.c      | 2 +-
 include/linux/crypto.h | 6 ++++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/crypto/zbewalgo.c b/crypto/zbewalgo.c
index 9db0d43b..e57b5ced 100644
--- a/crypto/zbewalgo.c
+++ b/crypto/zbewalgo.c
@@ -134,7 +134,7 @@ static int zbewalgo_decompress_crypto_unsafe(struct crypto_tfm *tfm,
 
 static struct crypto_alg crypto_alg_zbewalgo = {
 	.cra_name = "zbewalgo",
-	.cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
+	.cra_flags = CRYPTO_ALG_TYPE_COMPRESS | CRYPTO_ALG_UNSTABLE_ENCODING,
 	.cra_ctxsize = sizeof(struct zbewalgo_ctx),
 	.cra_module = THIS_MODULE,
 	.cra_init = zbewalgo_init,
diff --git a/include/linux/crypto.h b/include/linux/crypto.h
index 6bfb1aea..2228dd08 100644
--- a/include/linux/crypto.h
+++ b/include/linux/crypto.h
@@ -112,6 +112,12 @@
  */
 #define CRYPTO_ALG_OPTIONAL_KEY		0x00004000
 
+/*
+ * Set if the algorithm is new and it is likely that the encoding may
+ * change in near future
+ */
+#define CRYPTO_ALG_UNSTABLE_ENCODING	0x00008000
+
 /*
  * Transform masks and values (for crt_flags).
  */
-- 
2.14.1