From 95da1e3c303a65bfe6aa78fd84702577109904c9 Mon Sep 17 00:00:00 2001
From: acetone <63557806+acetoneRu@users.noreply.github.com>
Date: Sun, 16 May 2021 14:04:54 -0400
Subject: [PATCH] x25519.cpp added

---
 x25519.cpp | 77 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 77 insertions(+)
 create mode 100644 x25519.cpp

diff --git a/x25519.cpp b/x25519.cpp
new file mode 100644
index 0000000..712f797
--- /dev/null
+++ b/x25519.cpp
@@ -0,0 +1,77 @@
+#include <openssl/evp.h> 
+#include <openssl/bn.h>
+#include <iostream>
+#include <string>
+#include <iomanip>
+#include "Base.h"
+
+#define KEYSIZE 32
+size_t len = KEYSIZE;
+
+struct BoxKeys
+{
+    uint8_t PublicKey[KEYSIZE];
+    uint8_t PrivateKey[KEYSIZE];
+};
+
+BoxKeys getKeyPair()
+{
+    BoxKeys keys;
+
+    EVP_PKEY_CTX * Ctx;
+    EVP_PKEY * Pkey = nullptr;
+    Ctx = EVP_PKEY_CTX_new_id (NID_X25519, NULL);
+
+    EVP_PKEY_keygen_init (Ctx);
+    EVP_PKEY_keygen (Ctx, &Pkey);
+
+    EVP_PKEY_get_raw_public_key (Pkey, keys.PublicKey, &len);
+    EVP_PKEY_get_raw_private_key (Pkey, keys.PrivateKey, &len);
+
+    EVP_PKEY_CTX_free(Ctx);
+    EVP_PKEY_free(Pkey);
+
+    return keys;
+}
+
+int main(int argc, char * argv[])
+{
+    if (argc > 1)
+    {
+        std::string arg = static_cast<std::string>(argv[1]);
+        if (arg == "--usage" || arg == "--help" || arg == "-h")
+        {
+            std::cout << "The x25519 keys are used for authentication with an encrypted LeaseSet.\n"
+            << "Server side:\n"
+            << "  signaturetype = 11\n"
+            << "  i2cp.leaseSetType = 5\n"
+            << "  i2cp.leaseSetAuthType = 1\n"
+            << "  i2cp.leaseSetClient.dh.210 = clientName:PublicKey\n"
+            << "Client side:\n"
+            << "  i2cp.leaseSetPrivKey = PrivateKey\n\n"
+            << "https://i2pd.readthedocs.io/en/latest/user-guide/tunnels/" << std::endl;
+
+            return 0;
+        }
+    }
+
+    BoxKeys newKeys = getKeyPair();
+
+    size_t len_out = 50;
+    char b64Public[len_out] = {0};
+    char b64Private[len_out] = {0};
+
+    i2p::data::ByteStreamToBase64 (newKeys.PublicKey, len, b64Public, len_out);
+
+    std::cout << "PublicKey: ";
+    for (int i = 0; b64Public[i] != 0; ++i)
+        std::cout << b64Public[i];
+
+    i2p::data::ByteStreamToBase64 (newKeys.PrivateKey, len, b64Private, len_out);
+
+    std::cout << "\nPrivateKey: ";
+    for (int i = 0; b64Private[i] != 0; ++i)
+        std::cout << b64Private[i];
+
+    return 0;
+}