ecc: Support "label" for EdDSA context in data.

* cipher/pubkey-util.c (_gcry_pk_util_data_to_mpi): Handle ctx->label.

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

1 files changed, 23 insertions, 0 deletions

diff --git a/cipher/pubkey-util.c b/cipher/pubkey-util.c
index c04480d1..3ce66c37 100644
--- a/cipher/pubkey-util.c
+++ b/cipher/pubkey-util.c
@@ -760,6 +760,29 @@ _gcry_pk_util_data_to_mpi (gcry_sexp_t input, gcry_mpi_t *ret_mpi,
       if (rc)
         goto leave;
 
+      /* Get LABEL. */
+      list = sexp_find_token (ldata, "label", 0);
+      if (list)
+        {
+          s = sexp_nth_data (list, 1, &n);
+          if (!s)
+            rc = GPG_ERR_NO_OBJ;
+          else if (n > 0)
+            {
+              ctx->label = xtrymalloc (n);
+              if (!ctx->label)
+                rc = gpg_err_code_from_syserror ();
+              else
+                {
+                  memcpy (ctx->label, s, n);
+                  ctx->labellen = n;
+                }
+            }
+          sexp_release (list);
+          if (rc)
+            goto leave;
+        }
+
       /* Get VALUE.  */
       value = sexp_nth_buffer (lvalue, 1, &valuelen);
       if (!value)