scd: ECDH Support.

* agent/divert-scd.c (divert_pkdecrypt): Support ECDH.
* scd/app-openpgp.c (get_algo_byte, store_fpr): Support ECDH.
(send_key_attr): Support ECDH.  Fix EdDSA algorithm value.
(retrieve_key_material): Initialize fields.
(get_public_key, ecc_writekey, do_writekey): Support ECDH.
(ecdh_writekey): Remove.
(do_decipher): Support ECDH.
(parse_algorithm_attribute): Support ECDH.  Fix EdDSA.

--

Following the gpg-agent protocol, SCDaemon's counter part is now
implemented.

1 files changed, 38 insertions, 10 deletions

diff --git a/agent/divert-scd.c b/agent/divert-scd.c
index ceef588fb..1408d65af 100644
--- a/agent/divert-scd.c
+++ b/agent/divert-scd.c
@@ -417,17 +417,45 @@ divert_pkdecrypt (ctrl_t ctrl,
   n = snext (&s);
   if (!n)
     return gpg_error (GPG_ERR_INV_SEXP);
-  if (!smatch (&s, n, "rsa"))
+  if (smatch (&s, n, "rsa"))
+    {
+      if (*s != '(')
+        return gpg_error (GPG_ERR_UNKNOWN_SEXP);
+      s++;
+      n = snext (&s);
+      if (!n)
+        return gpg_error (GPG_ERR_INV_SEXP);
+      if (!smatch (&s, n, "a"))
+        return gpg_error (GPG_ERR_UNKNOWN_SEXP);
+      n = snext (&s);
+    }
+  else if (smatch (&s, n, "ecdh"))
+    {
+      if (*s != '(')
+        return gpg_error (GPG_ERR_UNKNOWN_SEXP);
+      s++;
+      n = snext (&s);
+      if (!n)
+        return gpg_error (GPG_ERR_INV_SEXP);
+      if (smatch (&s, n, "s"))
+        {
+          n = snext (&s);
+          s += n;
+          if (*s++ != ')')
+            return gpg_error (GPG_ERR_INV_SEXP);
+          if (*s++ != '(')
+            return gpg_error (GPG_ERR_UNKNOWN_SEXP);
+          n = snext (&s);
+          if (!n)
+            return gpg_error (GPG_ERR_INV_SEXP);
+        }
+      if (!smatch (&s, n, "e"))
+        return gpg_error (GPG_ERR_UNKNOWN_SEXP);
+      n = snext (&s);
+    }
+  else
     return gpg_error (GPG_ERR_UNSUPPORTED_ALGORITHM);
-  if (*s != '(')
-    return gpg_error (GPG_ERR_UNKNOWN_SEXP);
-  s++;
-  n = snext (&s);
-  if (!n)
-    return gpg_error (GPG_ERR_INV_SEXP);
-  if (!smatch (&s, n, "a"))
-    return gpg_error (GPG_ERR_UNKNOWN_SEXP);
-  n = snext (&s);
+
   if (!n)
     return gpg_error (GPG_ERR_UNKNOWN_SEXP);
   ciphertext = s;