42 lines
1.7 KiB
Markdown
42 lines
1.7 KiB
Markdown
+++
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title = 'Yali Devlog: Intro'
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date = 2024-08-06T22:45:00+02:00
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tags = ["encryption", "rust"]
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categories = ["yali"]
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draft = false
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summary = "*Blazingly* 🚀 fast large #️⃣ numbers written in 100% safe Rust 🦀"
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## Introduction
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I have always been fascinated by modern encryption. I have tried multiple times to implement RSA.
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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.
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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 :)
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```text
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[svante@desktop-nixos ~/development/yali]$ time target/release/yali
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target/release/yali 0,25s user 0,00s system 99% cpu 0,250 total
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```
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## How did I get here
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I started out, thinking it was easy, by just storing all data in a simple `Vec<u8>`, and using a lot of greedy algorithms.
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This was extremely slow, taking multiple seconds just performing RSA encryption.
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As I continued, I made a couple of optimisations:
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1. Implement a more efficient multiplication alogorithm
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2. Implement a more efficient exponetiation algorithm
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3. Implement a more efficient division algorithm
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And one of the most effective changes was:
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Changing the underlying datatype from `Vec<u8>` to `[u8; N]`. This avoids allocating memory on the heap every time you perform an operation.
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## Future plans
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In the future, I'm planning to implement:
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- [Toom-Cook multiplication](https://en.wikipedia.org/wiki/Toom%E2%80%93Cook_multiplication)
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- [Montgomery modular multiplication](https://en.wikipedia.org/wiki/Montgomery_modular_multiplication)
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My current goal is reaching <100 ms.
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Bye bye :33
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