1 files changed, 29 insertions, 0 deletions
diff --git a/library/sodium-plus/lib/keytypes/x25519sk.js b/library/sodium-plus/lib/keytypes/x25519sk.js
new file mode 100644
index 000000000..8b8016f83
--- /dev/null
+++ b/library/sodium-plus/lib/keytypes/x25519sk.js
@@ -0,0 +1,29 @@
+const CryptographyKey = require('../cryptography-key');
+
+class X25519SecretKey extends CryptographyKey {
+    constructor(buf) {
+        if (buf.length !== 32) {
+            throw new Error('X25519 secret keys must be 32 bytes long');
+        }
+        super(buf);
+        this.keyType = 'x25519';
+        this.publicKey = false;
+    }
+
+    /**
+     * @return {X25519SecretKey}
+     */
+    static from() {
+        return new X25519SecretKey(Buffer.from(...arguments));
+    }
+
+    isX25519Key() {
+        return true;
+    }
+
+    isPublicKey() {
+        return false;
+    }
+}
+
+module.exports = X25519SecretKey;