Add binding for ed25519 (#8)

Co-authored-by: SessionHero01 <[email protected]>

Author: SessionHero01

library/src/main/cpp/CMakeLists.txt

@@ -41,6 +41,7 @@ set(SOURCES
         logging.cpp
         encryption.cpp
         jni_utils.cpp
+        ed25519.cpp
 )
 
 add_library( # Sets the name of the library.

library/src/main/cpp/ed25519.cpp

@@ -0,0 +1,33 @@
+#include "jni_utils.h"
+#include "util.h"
+
+#include <session/ed25519.hpp>
+
+extern "C"
+JNIEXPORT jbyteArray JNICALL
+Java_network_loki_messenger_libsession_1util_ED25519_sign(JNIEnv *env, jobject thiz,
+                                                          jbyteArray ed25519_private_key,
+                                                          jbyteArray message) {
+    return jni_utils::run_catching_cxx_exception_or_throws<jbyteArray>(env, [=] {
+        auto sigs = session::ed25519::sign(
+                jni_utils::JavaByteArrayRef(env, ed25519_private_key).get(),
+                jni_utils::JavaByteArrayRef(env, message).get());
+
+        return util::bytes_from_vector(env, sigs);
+    });
+}
+
+extern "C"
+JNIEXPORT jboolean JNICALL
+Java_network_loki_messenger_libsession_1util_ED25519_verify(JNIEnv *env, jobject thiz,
+                                                            jbyteArray ed25519_public_key,
+                                                            jbyteArray message,
+                                                            jbyteArray signature) {
+    return jni_utils::run_catching_cxx_exception_or_throws<jboolean>(env, [=] {
+        return session::ed25519::verify(
+                jni_utils::JavaByteArrayRef(env, signature).get(),
+                jni_utils::JavaByteArrayRef(env, ed25519_public_key).get(),
+                jni_utils::JavaByteArrayRef(env, message).get()
+                );
+    });
+}

library/src/main/java/network/loki/messenger/libsession_util/ED25519.kt

@@ -0,0 +1,28 @@
+package network.loki.messenger.libsession_util
+
+object ED25519 {
+    /**
+     * Sign a message using the ed25519 private key
+     *
+     * @param ed25519PrivateKey 64 bytes ed25519 private key
+     * @param message Message to sign
+     * @return 64 bytes signature
+     */
+    external fun sign(
+        ed25519PrivateKey: ByteArray,
+        message: ByteArray,
+    ): ByteArray
+
+    /**
+     * Verify a message using the ed25519 public key
+     *
+     * @param ed25519PublicKey 32 bytes ed25519 public key
+     * @param message Message to verify
+     * @param signature 64 bytes signature
+     */
+    external fun verify(
+        ed25519PublicKey: ByteArray,
+        message: ByteArray,
+        signature: ByteArray,
+    ): Boolean
+}