Small class for generating public-private key pairs, signing, and verifying signatures

crypto.ts

import { sign } from "tweetnacl"
import { decodeUTF8 } from "tweetnacl-util";

export class Crypto {
	private constructor() {}

	static generateKeys(): CryptoKeyPair {
		const naclKeyPair = sign.keyPair();
		return new CryptoKeyPair(naclKeyPair.publicKey, naclKeyPair.secretKey);
	}

	static sign(message: string | Uint8Array, privateKey: Uint8Array): Uint8Array {
		const bytes = typeof message == 'string' ? decodeUTF8(message) : message;
		const signature = sign.detached(bytes, privateKey);
		return signature;
	}

	static verify(message: string | Uint8Array, signature: Uint8Array, publicKey: Uint8Array): boolean {
		const bytes = typeof message == 'string' ? decodeUTF8(message) : message;
		return sign.detached.verify(bytes, signature, publicKey);
	}
}

export class CryptoKeyPair {
	constructor(
		readonly publicKey: Uint8Array,
		readonly privateKey: Uint8Array
	) {}
}