secrets.ts

// Sample code that is a mockup for chapter 1 of Brilliant's cryptocurrency
// course.

const N = 576429
const G = 104713

export class User {
    readonly #secretKey: number
    readonly publicKey: number

    constructor(secretKey: number) {
        this.#secretKey = secretKey
        this.publicKey = (secretKey * G) % N
    }

    send(message: number) {
        return new Message(message, this, (message * this.#secretKey) % N)
    }
}

export class Message {
    readonly message: number
    readonly signature: number
    readonly sender: User

    constructor(message: number, sender: User, signature: number) {
        this.message = message
        this.signature = signature
        this.sender = sender
    }

    verify() {
        return (
            (this.sender.publicKey * this.message) % N
            == (this.signature * G) % N
        )
    }
}