[PATCH 6/8] DES: Silence compiler warnings on Windows

[Jussi Kivilinna]

* cipher/des.c (working_memcmp): Make pointer arguments 'const void *'.
--

Following warning seen on Windows target build:

des.c: In function 'is_weak_key':
des.c:1019:40: warning: pointer targets in passing argument 1 of 'working_memcmp' differ in signedness [-Wpointer-sign]
       if ( !(cmp_result=working_memcmp(work, weak_keys[middle], 8)) )
                                        ^
des.c:149:1: note: expected 'const char *' but argument is of type 'unsigned char *'
 working_memcmp( const char *a, const char *b, size_t n )
 ^
des.c:1019:46: warning: pointer targets in passing argument 2 of 'working_memcmp' differ in signedness [-Wpointer-sign]
       if ( !(cmp_result=working_memcmp(work, weak_keys[middle], 8)) )
                                              ^
des.c:149:1: note: expected 'const char *' but argument is of type 'unsigned char *'
 working_memcmp( const char *a, const char *b, size_t n )
 ^

Signed-off-by: Jussi Kivilinna <jussi.kivilinna at iki.fi>
---
 cipher/des.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/cipher/des.c b/cipher/des.c
index bc2a474..d4863d1 100644
--- a/cipher/des.c
+++ b/cipher/des.c
@@ -146,8 +146,10 @@
  * depending on whether characters are signed or not.
  */
 static int
-working_memcmp( const char *a, const char *b, size_t n )
+working_memcmp( const void *_a, const void *_b, size_t n )
 {
+    const char *a = _a;
+    const char *b = _b;
     for( ; n; n--, a++, b++ )
 	if( *a != *b )
 	    return (int)(*(byte*)a) - (int)(*(byte*)b);