X-Git-Url: https://git.distorted.org.uk/u/mdw/catacomb/blobdiff_plain/4efe32ba5fe2ca310c060c3f98673de96d8b5f9a..80be023065ced106a4078a36371c135a60d2bd6c:/cfb-def.h

diff --git a/cfb-def.h b/cfb-def.h
index 51ab9e7..8de17b3 100644
--- a/cfb-def.h
+++ b/cfb-def.h
@@ -1,6 +1,6 @@
 /* -*-c-*-
  *
- * $Id: cfb-def.h,v 1.3 2001/06/17 00:10:51 mdw Exp $
+ * $Id: cfb-def.h,v 1.6 2004/04/17 09:58:37 mdw Exp $
  *
  * Definitions for ciphertext feedback mode
  *
@@ -27,20 +27,6 @@
  * MA 02111-1307, USA.
  */
 
-/*----- Revision history --------------------------------------------------* 
- *
- * $Log: cfb-def.h,v $
- * Revision 1.3  2001/06/17 00:10:51  mdw
- * Typesetting fixes
- *
- * Revision 1.2  2000/06/17 10:50:39  mdw
- * Use secure arena for memory allocation.  Rearrange setiv slightly.
- *
- * Revision 1.1  1999/12/10 23:16:39  mdw
- * Split mode macros into interface and implementation.
- *
- */
-
 #ifndef CATACOMB_CFB_DEF_H
 #define CATACOMB_CFB_DEF_H
 
@@ -180,7 +166,7 @@ void pre##_cfbinit(pre##_cfbctx *ctx,					\
 		     const void *key, size_t sz,			\
 		     const void *iv)					\
 {									\
-  static octet zero[PRE##_BLKSZ] = { 0 };				\
+  static const octet zero[PRE##_BLKSZ] = { 0 };				\
   pre##_init(&ctx->ctx, key, sz);					\
   pre##_cfbsetiv(ctx, iv ? iv : zero);					\
 }									\
@@ -221,7 +207,9 @@ void pre##_cfbencrypt(pre##_cfbctx *ctx,				\
 									\
   while (off < PRE##_BLKSZ) {						\
     register octet x = *s++;						\
-    *d++ = ctx->iv[off++] ^= x;						\
+    ctx->iv[off] ^= x;							\
+    if (d) *d++ = ctx->iv[off];						\
+    off++;								\
     sz--;								\
   }									\
 									\
@@ -235,10 +223,14 @@ void pre##_cfbencrypt(pre##_cfbctx *ctx,				\
       pre##_eblk(&ctx->ctx, iv, iv);					\
       if (sz < PRE##_BLKSZ)						\
 	break;								\
-      BLKC_XLOAD(PRE, iv, s);						\
-      BLKC_STORE(PRE, d, iv);						\
-      s += PRE##_BLKSZ;							\
-      d += PRE##_BLKSZ;							\
+      if (s) {								\
+	BLKC_XLOAD(PRE, iv, s);						\
+        s += PRE##_BLKSZ;						\
+      }									\
+      if (d) {								\
+        BLKC_STORE(PRE, d, iv);						\
+        d += PRE##_BLKSZ;					       	\
+      }									\
       sz -= PRE##_BLKSZ;						\
     }									\
     off = 0;								\
@@ -251,7 +243,9 @@ void pre##_cfbencrypt(pre##_cfbctx *ctx,				\
   small:								\
     do {								\
       register octet x = *s++;						\
-      *d++ = ctx->iv[off++] ^= x;					\
+      ctx->iv[off] ^= x;						\
+      if (d) *d++ = ctx->iv[off];					\
+      off++;								\
       sz--;								\
     } while (sz);							\
   }									\