agent: Use get_pk_algo_from_key.

* agent/findkey.c (key_parms_from_sexp, is_eddsa): Remove.
(agent_pk_get_algo): Remove.
* agent/pksign.c (agent_pksign_do): Use get_pk_algo_from_key.

Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>

agent/findkey.c

@@ -1136,164 +1136,6 @@ agent_key_from_file (ctrl_t ctrl, const char *cache_nonce,
 }
 
 
-/* Return the string name from the S-expression S_KEY as well as a
-   string describing the names of the parameters.  ALGONAMESIZE and
-   ELEMSSIZE give the allocated size of the provided buffers.  The
-   buffers may be NULL if not required.  If R_LIST is not NULL the top
-   level list will be stored there; the caller needs to release it in
-   this case.  */
-static gpg_error_t
-key_parms_from_sexp (gcry_sexp_t s_key, gcry_sexp_t *r_list,
-                     char *r_algoname, size_t algonamesize,
-                     char *r_elems, size_t elemssize)
-{
-  gcry_sexp_t list, l2;
-  const char *name, *algoname, *elems;
-  size_t n;
-
-  if (r_list)
-    *r_list = NULL;
-
-  list = gcry_sexp_find_token (s_key, "shadowed-private-key", 0 );
-  if (!list)
-    list = gcry_sexp_find_token (s_key, "protected-private-key", 0 );
-  if (!list)
-    list = gcry_sexp_find_token (s_key, "private-key", 0 );
-  if (!list)
-    list = gcry_sexp_find_token (s_key, "public-key", 0 );
-  if (!list)
-    {
-      log_error ("invalid private key format\n");
-      return gpg_error (GPG_ERR_BAD_SECKEY);
-    }
-
-  l2 = gcry_sexp_cadr (list);
-  gcry_sexp_release (list);
-  list = l2;
-  name = gcry_sexp_nth_data (list, 0, &n);
-  if (n==3 && !memcmp (name, "rsa", 3))
-    {
-      algoname = "rsa";
-      elems = "ne";
-    }
-  else if (n==3 && !memcmp (name, "dsa", 3))
-    {
-      algoname = "dsa";
-      elems = "pqgy";
-    }
-  else if (n==3 && !memcmp (name, "ecc", 3))
-    {
-      algoname = "ecc";
-      elems = "pabgnq";
-    }
-  else if (n==5 && !memcmp (name, "ecdsa", 5))
-    {
-      algoname = "ecdsa";
-      elems = "pabgnq";
-    }
-  else if (n==4 && !memcmp (name, "ecdh", 4))
-    {
-      algoname = "ecdh";
-      elems = "pabgnq";
-    }
-  else if (n==3 && !memcmp (name, "elg", 3))
-    {
-      algoname = "elg";
-      elems = "pgy";
-    }
-  else
-    {
-      log_error ("unknown private key algorithm\n");
-      gcry_sexp_release (list);
-      return gpg_error (GPG_ERR_BAD_SECKEY);
-    }
-
-  if (r_algoname)
-    {
-      if (strlen (algoname) >= algonamesize)
-        return gpg_error (GPG_ERR_BUFFER_TOO_SHORT);
-      strcpy (r_algoname, algoname);
-    }
-  if (r_elems)
-    {
-      if (strlen (elems) >= elemssize)
-        return gpg_error (GPG_ERR_BUFFER_TOO_SHORT);
-      strcpy (r_elems, elems);
-    }
-
-  if (r_list)
-    *r_list = list;
-  else
-    gcry_sexp_release (list);
-
-  return 0;
-}
-
-
-/* Return true if KEYPARMS holds an EdDSA key.  */
-static int
-is_eddsa (gcry_sexp_t keyparms)
-{
-  int result = 0;
-  gcry_sexp_t list;
-  const char *s;
-  size_t n;
-  int i;
-
-  list = gcry_sexp_find_token (keyparms, "flags", 0);
-  for (i = list ? gcry_sexp_length (list)-1 : 0; i > 0; i--)
-    {
-      s = gcry_sexp_nth_data (list, i, &n);
-      if (!s)
-        continue; /* Not a data element. */
-
-      if (n == 5 && !memcmp (s, "eddsa", 5))
-        {
-          result = 1;
-          break;
-        }
-    }
-  gcry_sexp_release (list);
-  return result;
-}
-
-
-/* Return the public key algorithm number of S_KEY.  For ECC, returns
-   GCRY_PK_ECC (generic), even if it is known specifically for ECDSA.  */
-int
-agent_pk_get_algo (gcry_sexp_t s_key)
-{
-  int result;
-  gcry_sexp_t list;
-  char algoname[6];
-
-  if (!s_key)
-    return 0;
-
-  if (key_parms_from_sexp (s_key, &list, algoname, sizeof algoname, NULL, 0))
-    return 0;
-
-  if (!strcmp (algoname, "rsa"))
-    result = GCRY_PK_RSA;
-  else if (!strcmp (algoname, "dsa"))
-    result = GCRY_PK_DSA;
-  else if (!strcmp (algoname, "ecc"))
-    {
-      if (is_eddsa (list))
-        result = GCRY_PK_EDDSA;
-      else
-        result = GCRY_PK_ECC;
-    }
-  else if (!strcmp (algoname, "ecdsa"))
-    result = GCRY_PK_ECC;
-  else
-    result = 0;
-
-  gcry_sexp_release (list);
-  return result;
-}
-
-
 /* Return the key for the keygrip GRIP.  The result is stored at
    RESULT.  This function extracts the key from the private key
    database and returns it as an S-expression object as it is.  On

agent/pksign.c

@@ -320,7 +320,7 @@ agent_pksign_do (ctrl_t ctrl, const char *cache_nonce,
       goto leave;
     }
 
-  algo = agent_pk_get_algo (s_skey);
+  algo = get_pk_algo_from_key (s_skey);
 
   if (shadow_info || no_shadow_info)
     {