Renamed from `rsa-decrypt', since the name was no longer appropriate.

[u/mdw/catacomb] / cfb-def.h

diff --git a/cfb-def.h b/cfb-def.h
index 85d95db..bb3757c 100644 (file)
--- a/cfb-def.h
+++ b/cfb-def.h
@@ -1,6 +1,6 @@
 /* -*-c-*-
  *
- * $Id: cfb-def.h,v 1.1 1999/12/10 23:16:39 mdw Exp $
+ * $Id: cfb-def.h,v 1.2 2000/06/17 10:50:39 mdw Exp $
  *
  * Definitions for ciphertext feedback mode
  *
@@ -30,6 +30,9 @@
 /*----- Revision history --------------------------------------------------* 
  *
  * $Log: cfb-def.h,v $
+ * 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.
  *
@@ -49,6 +52,10 @@
 #include <mLib/bits.h>
 #include <mLib/sub.h>
 
+#ifndef CATACOMB_ARENA_H
+#  include "arena.h"
+#endif
+
 #ifndef CATACOMB_BLKC_H
 #  include "blkc.h"
 #endif
@@ -61,6 +68,10 @@
 #  include "paranoia.h"
 #endif
 
+#ifndef CATACOMB_PARANOIA_H
+#  include "paranoia.h"
+#endif
+
 /*----- Macros ------------------------------------------------------------*/
 
 /* --- @CFB_DEF@ --- *
@@ -88,8 +99,8 @@
 void pre##_cfbgetiv(const pre##_cfbctx *ctx, void *iv)                 \
 {                                                                      \
   octet *p = iv;                                                       \
-  int off = ctx->off;                                                  \
-  int rest = PRE##_BLKSZ - off;                                                \
+  unsigned off = ctx->off;                                             \
+  unsigned rest = PRE##_BLKSZ - off;                                   \
   memcpy(p, ctx->iv + off, rest);                                      \
   memcpy(p + rest, ctx->iv, off);                                      \
 }                                                                      \
@@ -106,11 +117,8 @@ void pre##_cfbgetiv(const pre##_cfbctx *ctx, void *iv)                     \
                                                                        \
 void pre##_cfbsetiv(pre##_cfbctx *ctx, const void *iv)                 \
 {                                                                      \
-  uint32 niv[PRE##_BLKSZ / 4];                                         \
-  BLKC_LOAD(PRE, niv, iv);                                             \
-  pre##_eblk(&ctx->ctx, niv, niv);                                     \
-  BLKC_STORE(PRE, ctx->iv, niv);                                       \
-  ctx->off = 0;                                                                \
+  memcpy(ctx->iv, iv, PRE##_BLKSZ);                                    \
+  ctx->off = PRE##_BLKSZ;                                              \
 }                                                                      \
                                                                        \
 /* --- @pre_cfbbdry@ --- *                                             \
@@ -125,10 +133,12 @@ void pre##_cfbsetiv(pre##_cfbctx *ctx, const void *iv)                    \
                                                                        \
 void pre##_cfbbdry(pre##_cfbctx *ctx)                                  \
 {                                                                      \
-  octet iv[PRE##_BLKSZ];                                               \
-  pre##_cfbgetiv(ctx, iv);                                             \
-  pre##_cfbsetiv(ctx, iv);                                             \
-  BURN(iv);                                                            \
+  uint32 niv[PRE##_BLKSZ / 4];                                         \
+  BLKC_LOAD(PRE, niv, ctx->iv);                                                \
+  pre##_eblk(&ctx->ctx, niv, niv);                                     \
+  BLKC_STORE(PRE, ctx->iv, niv);                                       \
+  ctx->off = PRE##_BLKSZ;                                              \
+  BURN(niv);                                                           \
 }                                                                      \
                                                                        \
 /* --- @pre_cfbsetkey@ --- *                                           \
@@ -144,6 +154,7 @@ void pre##_cfbbdry(pre##_cfbctx *ctx)                                       \
 void pre##_cfbsetkey(pre##_cfbctx *ctx, const pre##_ctx *k)            \
 {                                                                      \
   ctx->ctx = *k;                                                       \
+  ctx->off = PRE##_BLKSZ;                                              \
 }                                                                      \
                                                                        \
 /* --- @pre_cfbinit@ --- *                                             \
@@ -191,7 +202,7 @@ void pre##_cfbencrypt(pre##_cfbctx *ctx,                            \
 {                                                                      \
   const octet *s = src;                                                        \
   octet *d = dest;                                                     \
-  int off = ctx->off;                                                  \
+  unsigned off = ctx->off;                                             \
                                                                        \
   /* --- Empty blocks are trivial --- */                               \
                                                                        \
@@ -248,7 +259,7 @@ void pre##_cfbencrypt(pre##_cfbctx *ctx,                            \
   return;                                                              \
 }                                                                      \
                                                                        \
-/* --- @pre_cfbencrypt@ --- *                                          \
+/* --- @pre_cfbdecrypt@ --- *                                          \
  *                                                                     \
  * Arguments:  @pre_cfbctx *ctx@ = pointer to CFB context block        \
  *             @const void *src@ = pointer to source data              \
@@ -268,7 +279,7 @@ void pre##_cfbdecrypt(pre##_cfbctx *ctx,                            \
 {                                                                      \
   const octet *s = src;                                                        \
   octet *d = dest;                                                     \
-  int off = ctx->off;                                                  \
+  unsigned off = ctx->off;                                             \
                                                                        \
   /* --- Empty blocks are trivial --- */                               \
                                                                        \
@@ -340,7 +351,7 @@ typedef struct gctx {                                                       \
                                                                        \
 static gcipher *ginit(const void *k, size_t sz)                                \
 {                                                                      \
-  gctx *g = CREATE(gctx);                                              \
+  gctx *g = S_CREATE(gctx);                                            \
   g->c.ops = &gops;                                                    \
   pre##_cfbinit(&g->k, k, sz, 0);                                      \
   return (&g->c);                                                      \
@@ -361,7 +372,8 @@ static void gdecrypt(gcipher *c, const void *s, void *t, size_t sz) \
 static void gdestroy(gcipher *c)                                       \
 {                                                                      \
   gctx *g = (gctx *)c;                                                 \
-  DESTROY(g);                                                          \
+  BURN(*g);                                                            \
+  S_DESTROY(g);                                                                \
 }                                                                      \
                                                                        \
 static void gsetiv(gcipher *c, const void *iv)                         \
@@ -377,12 +389,12 @@ static void gbdry(gcipher *c)                                             \
 }                                                                      \
                                                                        \
 static const gcipher_ops gops = {                                      \
-  &pre##_cfb.b,                                                                \
-   gencrypt, gdecrypt, gdestroy, gsetiv, gbdry                         \
+  &pre##_cfb,                                                          \
+  gencrypt, gdecrypt, gdestroy, gsetiv, gbdry                          \
 };                                                                     \
                                                                        \
 const gccipher pre##_cfb = {                                           \
-  { #pre "-cfb", PRE##_KEYSZ, PRE##_BLKSZ },                           \
+  #pre "-cfb", pre##_keysz, PRE##_BLKSZ,                               \
   ginit                                                                        \
 };                                                                     \
                                                                        \