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+title = 'Yali Devlog: Intro'
+date = 2024-08-06T23:59:59+02:00
+tags = ["encryption", "rust"]
+categories = ["yali"]
+draft = false
+summary = "*Blazingly* 🚀 fast large #️⃣ numbers written  in 100% safe Rust 🦀"
++++
+
+## Introduction
+
+I have always been fascinated by modern encryption. I have tried multiple times to implement RSA.
+But I have failed every single time. Why? Because ~~I wrote it in Python~~ I didn't make it *blazingly* fast by writing it from scratch in 100% safe Rust.
+
+So I started writing my own [large int library](https://github.com/vanten-s/yali) from scratch. And I am finally able to perform 1024-bit RSA decryption under 500 ms on my desktop computer :)
+```text
+[svante@desktop-nixos ~/development/yali]$ time target/release/yali
+target/release/yali  0,25s user 0,00s system 99% cpu 0,250 total
+```
+
+## How did I get here
+I started out, thinking it was easy, by just storing all data in a simple `Vec<u8>`, and using a lot of greedy algorithms. 
+This was extremely slow, taking multiple seconds just performing RSA encryption.
+
+As I continued, I made a couple of optimisations:
+1. Implement a more efficient multiplication alogorithm
+2. Implement a more efficient exponetiation algorithm
+3. Implement a more efficient division algorithm
+
+And one of the most effective changes was:
+Changing the underlying datatype from `Vec<u8>` to `[u8; N]`. This avoids allocating memory on the heap every time you perform an operation.
+
+## Future plans
+In the future, I'm planning to implement:
+- [Toom-Cook multiplication](https://en.wikipedia.org/wiki/Toom%E2%80%93Cook_multiplication)
+- [Montgomery modular multiplication](https://en.wikipedia.org/wiki/Montgomery_modular_multiplication)
+
+My current goal is reaching <100 ms.
+
+Bye bye :33
+
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