[#172078979] Add encrypt/decrypt AES/RSA utility

[AleDore]

Added utility functions to provide hybrid AES/RSA encrypt/decrypt.

[gunzip]

lgtm apart minor changes

[Undermaken]

Suggested change

	expect(encryptedPayload).toHaveProperty("encryptedOutput");
	expect(encryptedPayload).toHaveProperty("encryptedPayload");

[Undermaken]

If I use ecrypt or decrypt function with wrong keys pair, I will get an exception.
For example this code raise an exception:

const encryptedPayload = toEncryptedPayload(rsaPublicKey, aTextToEncrypt);
    expect(encryptedPayload).toHaveProperty("encryptedPayload");
    const decryptedString = fromEncryptedPayload(
      rsaPrivateKey + "x", //wrong private key
      encryptedPayload
    );

Could this implementation be more error friendly?

export function fromEncryptedPayload(
  rsaPrivateKey: string,
  encryptedPayload: EncryptedPayload
): Either<Error, string> {
  return tryCatch(
    () => {
      const iv = Buffer.from(encryptedPayload.iv, "base64");
      const aesKey = crypto.privateDecrypt(
        rsaPrivateKey,
        Buffer.from(encryptedPayload.encryptedKey, "base64")
      );
      const decipher = crypto.createDecipheriv(
        "aes-128-cbc",
        Buffer.from(aesKey),
        iv
      );
      const decrypted = decipher.update(
        Buffer.from(encryptedPayload.encryptedPayload, "base64")
      );
      const output = Buffer.concat([decrypted, decipher.final()]);
      return output.toString("utf-8");
    },
    (e: unknown) => (e instanceof Error ? e : new Error(String(e)))
  );
}

[gunzip]

that's a very good point, probably yes give me a moment :)

[gunzip]

fixed