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authorSalvatore Mesoraca <s.mesoraca16@gmail.com>2018-04-09 15:54:46 +0200
committerHerbert Xu <herbert@gondor.apana.org.au>2018-04-21 00:58:32 +0800
commit13c935bb09948aef0202574ee12bb089459eb43b (patch)
tree6fa0ea9c5433ea754889a5924d566815b6ad7f35 /include/crypto
parentc4e848586cf11dd80633e4981108f36d4b414df1 (diff)
downloadlinux-13c935bb09948aef0202574ee12bb089459eb43b.tar.bz2
crypto: api - laying defines and checks for statically allocated buffers
In preparation for the removal of VLAs[1] from crypto code. We create 2 new compile-time constants: all ciphers implemented in Linux have a block size less than or equal to 16 bytes and the most demanding hw require 16 bytes alignment for the block buffer. We also enforce these limits in crypto_check_alg when a new cipher is registered. [1] http://lkml.kernel.org/r/CA+55aFzCG-zNmZwX4A2FQpadafLfEzK6CC=qPXydAacU1RqZWA@mail.gmail.com Signed-off-by: Salvatore Mesoraca <s.mesoraca16@gmail.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'include/crypto')
-rw-r--r--include/crypto/algapi.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/include/crypto/algapi.h b/include/crypto/algapi.h
index 1aba888241dd..bd5e8ccf1687 100644
--- a/include/crypto/algapi.h
+++ b/include/crypto/algapi.h
@@ -17,6 +17,14 @@
#include <linux/kernel.h>
#include <linux/skbuff.h>
+/*
+ * Maximum values for blocksize and alignmask, used to allocate
+ * static buffers that are big enough for any combination of
+ * ciphers and architectures.
+ */
+#define MAX_CIPHER_BLOCKSIZE 16
+#define MAX_CIPHER_ALIGNMASK 15
+
struct crypto_aead;
struct crypto_instance;
struct module;