1 files changed, 51 insertions, 0 deletions
diff --git a/lib/crypto/c_src/eddsa.c b/lib/crypto/c_src/eddsa.c
new file mode 100644
index 0000000000..0fdada9677
--- /dev/null
+++ b/lib/crypto/c_src/eddsa.c
@@ -0,0 +1,51 @@
+/*
+ * %CopyrightBegin%
+ *
+ * Copyright Ericsson AB 2010-2018. All Rights Reserved.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * %CopyrightEnd%
+ */
+
+#include "eddsa.h"
+
+#ifdef HAVE_EDDSA
+int get_eddsa_key(ErlNifEnv* env, int public, ERL_NIF_TERM key, EVP_PKEY **pkey)
+{
+    /* key=[K] */
+    ERL_NIF_TERM head, tail, tail2, algo;
+    ErlNifBinary bin;
+    int type;
+
+    if (!enif_get_list_cell(env, key, &head, &tail)
+	|| !enif_inspect_binary(env, head, &bin)
+        || !enif_get_list_cell(env, tail, &algo, &tail2)
+        || !enif_is_empty_list(env, tail2)) {
+	return 0;
+    }
+    if (algo == atom_ed25519) type = EVP_PKEY_ED25519;
+    else if (algo == atom_ed448) type = EVP_PKEY_ED448;
+    else
+        return 0;
+
+    if (public)
+        *pkey = EVP_PKEY_new_raw_public_key(type, NULL, bin.data, bin.size);
+    else 
+        *pkey = EVP_PKEY_new_raw_private_key(type, NULL, bin.data, bin.size);
+
+    if (!pkey)
+        return 0;
+    return 1;
+}
+#endif