AirtelMoney.Encryption (airtel_money v0.1.0)

Encryption module for Airtel Money PIN encryption.

Uses RSA public key encryption with OAEP padding for PIN protection as required by Airtel Money API.

Summary

Encrypts a PIN using RSA encryption with OAEP padding and Airtel's public key.

Fetches Airtel's RSA public key from the API.

@spec encrypt_pin(String.t(), String.t() | nil) ::
  {:ok, String.t()} | {:error, String.t()}

Encrypts a PIN using RSA encryption with OAEP padding and Airtel's public key.

pin - The PIN to encrypt (string)
public_key - Airtel's RSA public key in Base64 DER format (optional, will use config if not provided)

{:ok, encrypted_pin} on success, {:error, reason} on failure

iex> AirtelMoney.Encryption.encrypt_pin("1234")
{:ok, "encrypted_base64_string"}

@spec fetch_public_key() :: {:ok, String.t()} | {:error, AirtelMoney.Error.t()}

Fetches Airtel's RSA public key from the API.

{:ok, public_key} on success, {:error, reason} on failure