$NetBSD: idea-patch,v 1.1 2009/12/18 18:54:24 drochner Exp $

--- idea.c.orig	2006-11-15 15:43:12.000000000 +0000
+++ idea.c
@@ -49,8 +49,11 @@ typedef struct {
     int have_dk;
 } IDEA_context;
 
+static void expand_key(const byte *, u16 *);
+static void invert_key(u16 *, u16[IDEA_KEYLEN]);
+
 static int
-do_idea_setkey( IDEA_context *c, byte *key, unsigned int keylen )
+do_idea_setkey( IDEA_context *c, const byte *key, unsigned int keylen )
 {
     assert(keylen == 16);
     c->have_dk = 0;
@@ -98,7 +101,7 @@ mul_inv( u16 x )
 
 
 static void
-expand_key( byte *userkey, u16 *ek )
+expand_key( const byte *userkey, u16 *ek )
 {
     int i,j;
 
@@ -161,7 +164,7 @@ invert_key( u16 *ek, u16 dk[IDEA_KEYLEN]
 
 
 static void
-cipher( byte *outbuf, byte *inbuf, u16 *key )
+cipher( byte *outbuf, const byte *inbuf, u16 *key )
 {
     u16 x1, x2, x3,x4, s2, s3;
     u16 *in, *out;
@@ -237,7 +240,7 @@ cipher( byte *outbuf, byte *inbuf, u16 *
 }
 
 static void
-do_idea_encrypt( IDEA_context *c, byte *outbuf, byte *inbuf )
+do_idea_encrypt( IDEA_context *c, byte *outbuf, const byte *inbuf )
 {
     cipher( outbuf, inbuf, c->ek );
 }
@@ -251,7 +254,7 @@ idea_encrypt (void *context, byte *out, 
 }
 
 static void
-do_idea_decrypt( IDEA_context *c, byte *outbuf, byte *inbuf )
+do_idea_decrypt( IDEA_context *c, byte *outbuf, const byte *inbuf )
 {
     if( !c->have_dk ) {
        c->have_dk = 1;