* (bug 3019) use the operating system's random number generator if possible

when generating the qkey file

code/qcommon/common.c

@@ -3217,3 +3217,24 @@ void Field_AutoComplete( field_t *field )
 
 	Field_CompleteCommand( completionField->buffer, qtrue, qtrue );
 }
+
+/*
+==================
+Com_RandomBytes
+
+fills string array with len radom bytes, peferably from the OS randomizer
+==================
+*/
+void Com_RandomBytes( byte *string, int len )
+{
+	int i;
+
+	if( Sys_RandomBytes( string, len ) )
+		return;
+
+	Com_Printf( "Com_RandomBytes: using weak randomization\n" );
+	srand( time( 0 ) );
+	for( i = 0; i < len; i++ )
+		string[i] = (unsigned char)( rand() % 255 );
+}
+

code/qcommon/md5.c

@@ -263,7 +263,7 @@ char *Com_MD5File( const char *fn, int length, const char *prefix, int prefix_le
 	unsigned char digest[16] = {""}; 
 	fileHandle_t f;
 	MD5_CTX md5;
-	char buffer[2048];
+	byte buffer[2048];
 	int i;
 	int filelen = 0;
 	int r = 0;
@@ -296,7 +296,7 @@ char *Com_MD5File( const char *fn, int length, const char *prefix, int prefix_le
 		if(r + total > length)
 			r = length - total;
 		total += r;
-		MD5Update(&md5 , (unsigned char *)buffer, r);
+		MD5Update(&md5 , buffer, r);
 		if(r < sizeof(buffer) || total >= length)
 			break;
 	}

code/qcommon/q_shared.h

@@ -640,6 +640,8 @@ void	QDECL Com_sprintf (char *dest, int size, const char *fmt, ...) __attribute_
 char *Com_SkipTokens( char *s, int numTokens, char *sep );
 char *Com_SkipCharset( char *s, char *sep );
 
+void Com_RandomBytes( byte *string, int len );
+
 // mode parm for FS_FOpenFile
 typedef enum {
 	FS_READ,

code/qcommon/qcommon.h

@@ -1001,6 +1001,8 @@ int		Sys_Milliseconds (void);
 
 void	Sys_SnapVector( float *v );
 
+qboolean Sys_RandomBytes( byte *string, int len );
+
 // the system console is shown when a dedicated server is running
 void	Sys_DisplaySystemConsole( qboolean show );