From 81343bc06fc08d8a3ba441e6038c9be1ed093fdc Mon Sep 17 00:00:00 2001
From: Kae <80987908+Novaenia@users.noreply.github.com>
Date: Wed, 12 Jul 2023 15:13:30 +1000
Subject: Add Curve25519

---
 source/core/CMakeLists.txt     |  2 ++
 source/core/StarCurve25519.cpp | 50 ++++++++++++++++++++++++++++++++++++++++++
 source/core/StarCurve25519.hpp | 25 +++++++++++++++++++++
 3 files changed, 77 insertions(+)
 create mode 100644 source/core/StarCurve25519.cpp
 create mode 100644 source/core/StarCurve25519.hpp

(limited to 'source/core')

diff --git a/source/core/CMakeLists.txt b/source/core/CMakeLists.txt
index 08701d7..1fd2aac 100644
--- a/source/core/CMakeLists.txt
+++ b/source/core/CMakeLists.txt
@@ -21,6 +21,7 @@ SET (star_core_HEADERS
     StarColor.hpp
     StarCompression.hpp
     StarConfig.hpp
+    StarCurve25519.hpp
     StarDataStream.hpp
     StarDataStreamDevices.hpp
     StarDataStreamExtra.hpp
@@ -133,6 +134,7 @@ SET (star_core_SOURCES
     StarByteArray.cpp
     StarColor.cpp
     StarCompression.cpp
+    StarCurve25519.cpp
     StarDataStream.cpp
     StarDataStreamDevices.cpp
     StarDirectives.cpp
diff --git a/source/core/StarCurve25519.cpp b/source/core/StarCurve25519.cpp
new file mode 100644
index 0000000..f8f5451
--- /dev/null
+++ b/source/core/StarCurve25519.cpp
@@ -0,0 +1,50 @@
+#include "StarCurve25519.hpp"
+#include "StarRandom.hpp"
+#include "StarLogging.hpp"
+
+#include "curve25519/include/curve25519_dh.h"
+#include "curve25519/include/ed25519_signature.h"
+
+namespace Star::Curve25519 {
+
+struct KeySet {
+  PrivateKey privateKey;
+  PublicKey publicKey;
+
+  KeySet() {
+    SecretKey secret;
+    Random::randBytes(SecretKeySize).copyTo((char*)secret.data());
+
+    secret[0]  &= 248;
+    secret[31] &= 127;
+    secret[31] |= 64;
+
+    ed25519_CreateKeyPair(privateKey.data(), publicKey.data(), nullptr, secret.data());
+
+    Logger::info("Generated Curve25519 key-pair");
+  }
+};
+
+static KeySet const& staticKeys() {
+  static KeySet keys;
+
+  return keys;
+}
+
+PrivateKey const& privateKey() { return staticKeys().privateKey; }
+
+
+
+Signature sign(void* data, size_t len) {
+  Signature signature;
+  ed25519_SignMessage(signature.data(), privateKey().data(), nullptr, (unsigned char*)data, len);
+  return signature;
+}
+
+bool verify(uint8_t const* signature, uint8_t const* publicKey, void* data, size_t len) {
+  return ed25519_VerifySignature(signature, publicKey, (unsigned char*)data, len);
+}
+
+PublicKey  const& publicKey()  { return staticKeys().publicKey;  }
+
+}
\ No newline at end of file
diff --git a/source/core/StarCurve25519.hpp b/source/core/StarCurve25519.hpp
new file mode 100644
index 0000000..15fe4d1
--- /dev/null
+++ b/source/core/StarCurve25519.hpp
@@ -0,0 +1,25 @@
+#ifndef STAR_CURVE_25519_HPP
+#define STAR_CURVE_25519_HPP
+#include "StarEncode.hpp"
+#include "StarByteArray.hpp"
+#include "StarArray.hpp"
+
+namespace Star::Curve25519 {
+
+constexpr size_t PublicKeySize = 32;
+constexpr size_t SecretKeySize = 32;
+constexpr size_t PrivateKeySize = 64;
+constexpr size_t SignatureSize = 64;
+
+typedef Array<uint8_t, PublicKeySize> PublicKey;
+typedef Array<uint8_t, SecretKeySize> SecretKey;
+typedef Array<uint8_t, PrivateKeySize> PrivateKey;
+typedef Array<uint8_t, SignatureSize> Signature;
+
+PublicKey const& publicKey();
+Signature sign(void* data, size_t len);
+bool verify(uint8_t const* signature, uint8_t const* publicKey, void* data, size_t len);
+
+}
+
+#endif
\ No newline at end of file
-- 
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