From 8a6b476a8b0b4e56f237d2651f75757a0b7f73de Mon Sep 17 00:00:00 2001
From: Henrik Hautakoski <henrik@eossweden.org>
Date: Thu, 16 Mar 2023 11:07:42 +0100
Subject: [PATCH] include/libeosio/ec.hpp: Adding signature type.

---
 include/libeosio/ec.hpp | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/include/libeosio/ec.hpp b/include/libeosio/ec.hpp
index b7e7110..07249ca 100644
--- a/include/libeosio/ec.hpp
+++ b/include/libeosio/ec.hpp
@@ -57,6 +57,29 @@ struct ec_keypair {
 	ec_pubkey_t pub;
 };
 
+
+/**
+ * Elliptic curve recoverable signature
+ *
+ * The signature consist of 2 integers r,s and v where
+ * r: x cordinate of the random point
+ * s: signature proof
+ * v: recovery id (0, 1, 2 or 3), eg. what EC point is the public key.
+ *
+ * The memory layout is as follows:
+ * r(32), s(32), v(1) = 65 bytes.
+ */
+
+/**
+ * Elliptic curve signature key size (in bytes)
+ */
+#define EC_SIGNATURE_SIZE (32 + 32 + 1)
+
+/**
+ * Elliptic curve signature datastructure.
+ */
+typedef std::array<unsigned char, EC_SIGNATURE_SIZE> ec_signature_t;
+
 /**
  * Initialize the ec library.
  */