Update readme

README.md

@@ -1,14 +1,57 @@
-# native_crypto
+# NativeCrypto
 
-A new flutter plugin project.
+Fast crypto functions for Flutter.
 
-## Getting Started
+## Why 🤔
 
-This project is a starting point for a Flutter
-[plug-in package](https://flutter.dev/developing-packages/),
-a specialized package that includes platform-specific implementation code for
-Android and/or iOS.
+Because I faced a performance issue when I was using **PointyCastle**.
 
-For help getting started with Flutter, view our 
-[online documentation](https://flutter.dev/docs), which offers tutorials, 
-samples, guidance on mobile development, and a full API reference.
+It's quite simple, judge for yourself, these are times for AES256 encryption on an Android device.
+
+| Size | PointyCastle |
+|------|--------------|
+| 100 kB | 190 ms
+| 200 kB | 314 ms
+| 300 kB | 1138 ms
+| 400 kB | 2781 ms
+| 500 kB | 4691 ms
+| 600 kB | 7225 ms
+| 700 kB | 10264 ms
+| 800 kB | 13582 ms
+| 900 kB | 17607 ms
+
+> We notice that these times, in addition to being far too big, are not even linear.
+
+## Performances ⏱
+
+| Size | NativeCrypto |
+|------|--------------|
+| 1 mB | 27 ms
+| 2 mB | 43 ms
+| 3 mB | 78 ms
+| 4 mB | 93 ms
+| 5 mB | 100 ms
+| 10 mB | 229 ms
+| 50 mB | 779 ms
+
+## How 🔬
+
+Using the native implementation of the crypto libs available on each OS.
+
+For Android:
+
+* [javax.crypto](https://docs.oracle.com/javase/7/docs/api/javax/crypto/package-summary.html)
+* [java.security](https://docs.oracle.com/javase/7/docs/api/java/security/package-summary.html)
+
+For iOS:
+
+* [CommonCrypto](https://developer.apple.com/library/archive/documentation/Security/Conceptual/cryptoservices/Introduction/Introduction.html)
+* [CryptoKit](https://developer.apple.com/documentation/cryptokit/)
+
+## Todo 🚀
+
+* ✅ Implement working cross platform encryption/decryption.
+* Complete AES implementation (all key sizes, padding, modes...).
+* Improve performances.
+* Add ChaCha20.
+* ... add asym crypto support.