Add Curve25519

1 files changed, 50 insertions, 0 deletions

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;  }
+
+}
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