dsig.c: Allow precomputed hashes to be read from a file.

[u/mdw/catacomb] / key-binary.c

diff --git a/key-binary.c b/key-binary.c
index 75cfbe7..c1ef53b 100644 (file)
--- a/key-binary.c
+++ b/key-binary.c
@@ -1,13 +1,13 @@
 /* -*-c-*-
  *
- * $Id: key-binary.c,v 1.7 2004/04/08 01:36:15 mdw Exp $
+ * $Id$
  *
  * Key binary encoding
  *
  * (c) 1999 Straylight/Edgeware
  */
 
-/*----- Licensing notice --------------------------------------------------* 
+/*----- Licensing notice --------------------------------------------------*
  *
  * This file is part of Catacomb.
  *
@@ -15,12 +15,12 @@
  * it under the terms of the GNU Library General Public License as
  * published by the Free Software Foundation; either version 2 of the
  * License, or (at your option) any later version.
- * 
+ *
  * Catacomb is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU Library General Public License for more details.
- * 
+ *
  * You should have received a copy of the GNU Library General Public
  * License along with Catacomb; if not, write to the Free
  * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
@@ -47,17 +47,17 @@
  *
  * Arguments:  @const void *p@ = pointer to buffer to read
  *             @size_t sz@ = size of the buffer
- *             @key_data *k@ = pointer to key data block to write to
  *
- * Returns:    Zero if everything worked, nonzero otherwise.
+ * Returns:    The newly-read key data, or null if it failed.
  *
  * Use:                Decodes a binary representation of a key.
  */
 
-int key_decode(const void *p, size_t sz, key_data *k)
+key_data *key_decode(const void *p, size_t sz)
 {
   const octet *q = p;
   size_t psz;
+  key_data *kd;
   unsigned e;
 
   /* --- Parse the header information --- *
@@ -70,8 +70,7 @@ int key_decode(const void *p, size_t sz, key_data *k)
   e = LOAD16(q);
   psz = LOAD16(q + 2);
   if (psz + 4 > sz)
-    return (-1);
-  k->e = e;
+    return (0);
 
   /* --- Now decide what to do --- */
 
@@ -81,51 +80,51 @@ int key_decode(const void *p, size_t sz, key_data *k)
 
     case KENC_BINARY:
     case KENC_ENCRYPT:
-      k->u.k.k = sub_alloc(psz);
-      memcpy(k->u.k.k, q + 4, psz);
-      k->u.k.sz = psz;
+      kd = key_newbinary(e, q + 4, psz);
       break;
 
     /* --- Multiprecision integer data --- */
 
     case KENC_MP:
-      k->u.m = mp_loadb(k->e & KF_BURN ? MP_NEWSEC : MP_NEW, q + 4, psz);
+      kd = key_newmp(e, mp_loadb(e & KF_BURN ? MP_NEWSEC : MP_NEW,
+                                q + 4, psz));
       break;
 
     /* --- String data --- */
 
     case KENC_STRING:
-      k->u.p = xmalloc(sz + 1);
-      memcpy(k->u.p, q + 4, sz);
-      k->u.p[sz] = 0;
+      kd = key_newraw(e);
+      kd->u.p = xmalloc(sz + 1);
+      memcpy(kd->u.p, q + 4, sz);
+      kd->u.p[sz] = 0;
       break;
 
     /* --- Elliptic curve point data --- */
 
     case KENC_EC: {
       size_t xsz, ysz;
-      EC_CREATE(&k->u.e);
+      kd = key_newraw(e);
+      EC_CREATE(&kd->u.e);
       if (!sz) break;
-      if (sz < 2) return (-1);
+      if (sz < 2) return (0);
       xsz = LOAD16(q + 4);
-      if (sz < xsz + 4) return (-1);
+      if (sz < xsz + 4) return (0);
       ysz = LOAD16(q + 6 + xsz);
-      if (sz < xsz + ysz + 4) return (-1);
-      k->u.e.x = mp_loadb(MP_NEW, q + 6, xsz);
-      k->u.e.y = mp_loadb(MP_NEW, q + 6 + xsz, ysz);
+      if (sz < xsz + ysz + 4) return (0);
+      kd->u.e.x = mp_loadb(MP_NEW, q + 6, xsz);
+      kd->u.e.y = mp_loadb(MP_NEW, q + 8 + xsz, ysz);
     } break;
 
     /* --- Structured key data --- */
 
     case KENC_STRUCT: {
       dstr d = DSTR_INIT;
-      key_struct *ks;
-      unsigned f;
+      key_data *nkd;
 
-      if ((k->e & ~KF_ENCMASK) || (psz & 3))
-       return (-1);
+      if ((e & ~KF_ENCMASK) || (psz & 3))
+       return (0);
       q += 4;
-      sym_create(&k->u.s);
+      kd = key_newstruct();
 
       while (psz) {
 
@@ -142,20 +141,15 @@ int key_decode(const void *p, size_t sz, key_data *k)
 
        /* --- Read the encoding and size --- */
 
-       e = LOAD16(q);
        sz = (LOAD16(q + 2) + 7) & ~3;
        if (sz > psz)
          goto fail;
 
        /* --- Create a table node and fill it in --- */
 
-       ks = sym_find(&k->u.s, d.buf, d.len, sizeof(*ks), &f);
-       if (f)
+       if ((nkd = key_decode(q, sz)) == 0)
          goto fail;
-       if (key_decode(q, sz, &ks->k)) {
-         sym_remove(&k->u.s, ks);
-         goto fail;
-       }
+       key_structsteal(kd, d.buf, nkd);
        psz -= sz;
        q += sz;
       }
@@ -166,19 +160,20 @@ int key_decode(const void *p, size_t sz, key_data *k)
 
     fail:
       dstr_destroy(&d);
-      key_destroy(k);
-      return (-1);
+      key_drop(kd);
+      return (0);
     } break;
 
     /* --- Everything else --- */
 
     default:
-      return (-1);
+      return (0);
   }
 
   /* --- OK, that was good --- */
 
-  return (0);
+  kd->e = e;
+  return (kd);
 }
 
 /* --- @key_encode@ --- *
@@ -280,7 +275,7 @@ int key_encode(key_data *k, dstr *d, const key_filter *kf)
       p = d->buf + n;
       STORE16(p, k->e & KF_ENCMASK);
       d->len += 4;
-      
+
       for (nks = 0, sym_mkiter(&i, &k->u.s);
           (ks = sym_next(&i)) != 0;
           nks++);
@@ -297,7 +292,7 @@ int key_encode(key_data *k, dstr *d, const key_filter *kf)
          DPUTS(d, SYM_NAME(ks));
          while (d->len & 3)
            DPUTC(d, 0);
-         if (key_encode(&ks->k, d, kf))
+         if (key_encode(ks->k, d, kf))
            rc = 1;
          else
            d->len = o;
@@ -305,7 +300,7 @@ int key_encode(key_data *k, dstr *d, const key_filter *kf)
        xfree(ksv);
       }
       if (!rc)
-        d->len = n;
+       d->len = n;
       else {
        p = d->buf + n + 2;
        n = d->len - n - 4;