key-binary.c

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

diff --git a/key-misc.c b/key-misc.c
index afd0a4b..a502293 100644 (file)
--- a/key-misc.c
+++ b/key-misc.c
@@ -1,6 +1,6 @@
 /* -*-c-*-
  *
- * $Id: key-misc.c,v 1.3 2001/06/22 19:39:12 mdw Exp $
+ * $Id: key-misc.c,v 1.4 2004/04/08 01:02:49 mdw Exp $
  *
  * Simple key management
  *
@@ -30,6 +30,9 @@
 /*----- Revision history --------------------------------------------------* 
  *
  * $Log: key-misc.c,v $
+ * Revision 1.4  2004/04/08 01:02:49  mdw
+ * key-binary.c
+ *
  * Revision 1.3  2001/06/22 19:39:12  mdw
  * New interface to find out whether a key has expired.  Also, a bug fix
  * to @key_bytag@ so that it finds expired keys correctly.
@@ -365,4 +368,55 @@ int key_used(key_file *f, key *k, time_t t)
   return (0);
 }
 
+/* --- @key_fingerprint@ --- *
+ *
+ * Arguments:  @key *k@ = the key to fingerprint
+ *             @ghash *h@ = the hash to use
+ *             @const key_filter *kf@ = filter to apply
+ *
+ * Returns:    Nonzero if the key slightly matched the filter.
+ *
+ * Use:                Updates the hash context with the key contents.
+ */
+
+static int abyname(const void *a, const void *b) {
+  key_attr *const *x = a, *const *y = b;
+  return (strcmp(SYM_NAME(*x), SYM_NAME(*y)));
+}
+
+int key_fingerprint(key *k, ghash *h, const key_filter *kf)
+{
+  dstr d = DSTR_INIT;
+  int rc = 0;
+  key_attr *a, **v;
+  size_t n, i, len;
+  octet b[2];
+  sym_iter ai;
+
+  if (!key_encode(&k->k, &d, kf))
+    goto done;
+  rc = 1;
+  GH_HASH(h, d.buf, d.len);
+  for (n = 0, sym_mkiter(&ai, &k->a); (a = sym_next(&ai)) != 0; n++);
+  if (n) {
+    v = xmalloc(n * sizeof(*v));
+    for (i = 0, sym_mkiter(&ai, &k->a); (a = sym_next(&ai)) != 0; i++)
+      v[i] = a;
+    qsort(v, n, sizeof(*v), abyname);
+    len = strlen(k->type); STORE8(b, len);
+    GH_HASH(h, b, 1); GH_HASH(h, k->type, len);
+    for (i = 0; i < n; i++) {
+      a = v[i];
+      len = strlen(SYM_NAME(a)); STORE8(b, len);
+      GH_HASH(h, b, 1); GH_HASH(h, SYM_NAME(a), len);
+      len = strlen(a->p); STORE16(b, len);
+      GH_HASH(h, b, 2); GH_HASH(h, a->p, len);
+    }
+    xfree(v);
+  }    
+done:
+  dstr_destroy(&d);
+  return (rc);
+}
+
 /*----- That's all, folks -------------------------------------------------*/