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cryptography.d

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+module angel.utils.cryptography.cryptography;
+
+// Internal imports
+import angel.utils.logging;
+import angel.utils.cryptography.curve25519;
+// External imports
+import std.stdio;
+import std.random;
+import std.format;
+
+class Cryptography {
+    public {
+        struct KeyPair {
+            ubyte[32] clientSecretKey;
+            ubyte[32] sharedSecret;
+        }
+    }
+
+    public static KeyPair derive_25519(ubyte[] pk) {
+        ubyte[32] sk; // generate client secret key
+        for (int i = 0; i < 32; ++i) {
+            sk[i] = cast(ubyte)(uniform(0, 256));
+        }
+
+        Logger.log(LogLevel.Debug, "Generated client sk");
+
+        ubyte[32] ss = curve25519_scalarmult(sk, pk); // derive shared secret out of pk and sk
+
+        Logger.log(LogLevel.Debug, format("Derived shared secret: %s", ss));
+
+        return KeyPair(sk, ss);
+    }
+}