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This is an example to demo how you generate the RSA key pair from server side(.NetCore 3.1) and pass the public key to the client(Browser) for encrypting the data that <= 245 bytes.

RSA-2048 can only support to encrypt up to 245 bytes data.

Generate RSA key pair in C# (.Net Core 3.1):

using var rsaProvider = new RSACng();
// spki is used for browser side encryption
var spki = Convert.ToBase64String(rsaProvider.ExportSubjectPublicKeyInfo());
var encodedPrivateKey = Convert.ToBase64String(rsaProvider.ExportPkcs8PrivateKey());

32-bit ELF binary

how to assemble and link:

nasm -f elf32 -o <filename>.o <filename>.asm
ld -m elf_i386 -o <filename> <filename>.o

template code (hello world):

section .text
global _start

	/**
	* Usage:
	* ```
	* std::function<void(int32)> callback; // This should be stored as e.g. class member
	* ...
	* addInt32Callback (wrapCallable<int32>(callback), &callback);
	* ```
	* @tparam T
	* @tparam Callable
	* @return function pointer

	// To ensure cross-browser support even without a proper SubtleCrypto
	// impelmentation (or without access to the impelmentation, as is the case with
	// Chrome loaded over HTTP instead of HTTPS), this library can create SHA-256
	// HMAC signatures using nothing but raw JavaScript

	/* eslint-disable no-magic-numbers, id-length, no-param-reassign, new-cap */

	// By giving internal functions names that we can mangle, future calls to
	// them are reduced to a single byte (minor space savings in minified file)
	var uint8Array = Uint8Array;