crypto: adjust rijndaelEncrypt() prototype for gcc11

The upcoming release complains, not entirely unreasonably:

In file included from rijndael.c:33:
.../xen/include/crypto/rijndael.h:55:53: note: previously declared as 'const unsigned char[]'
   55 | void    rijndaelEncrypt(const unsigned int [], int, const unsigned char [],
      |                                                     ^~~~~~~~~~~~~~~~~~~~~~
rijndael.c:865:8: error: argument 4 of type 'u8[16]' {aka 'unsigned char[16]'} with mismatched bound [-Werror=array-parameter=]
  865 |     u8 ct[16])
      |     ~~~^~~~~~
In file included from rijndael.c:33:
.../xen/include/crypto/rijndael.h:56:13: note: previously declared as 'unsigned char[]'
   56 |             unsigned char []);
      |             ^~~~~~~~~~~~~~~~

Simply declare the correct array dimensions right away. This then allows
compilers to apply checking at call sites, which seems desirable anyway.

For the moment I'm leaving untouched the disagreement between u8/u32
used in the function definition and unsigned {char,int} used in the
declaration, as making this consistent would call for touching further
functions.

Reported-by: Charles Arnold <carnold@suse.com>
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Julien Grall <jgrall@amazon.com>
master commit: c6ad5a701b9a6df443a6c98d9e7201c958bbcafc
master date: 2021-03-04 16:47:51 +0100

diff --git a/xen/include/crypto/rijndael.h b/xen/include/crypto/rijndael.h
index 69965783c502e6ab5d8dbc555bdff2345f9b030a..4386be5878516a94131da4e852567b76fb0dfde1 100644 (file)
--- a/xen/include/crypto/rijndael.h
+++ b/xen/include/crypto/rijndael.h
@@ -52,7 +52,7 @@ void   rijndael_encrypt(rijndael_ctx *, const unsigned char *, unsigned char *);
 
 int    rijndaelKeySetupEnc(unsigned int [], const unsigned char [], int);
 int    rijndaelKeySetupDec(unsigned int [], const unsigned char [], int);
-void   rijndaelEncrypt(const unsigned int [], int, const unsigned char [],
-           unsigned char []);
+void   rijndaelEncrypt(const unsigned int [], int, const unsigned char [16],
+           unsigned char [16]);
 
 #endif /* __RIJNDAEL_H */