[그 외] public key, private key file로부터 가져오기

    private PublicKey getPublicKey() {
        File publicKeyFile = new File("src/main/resources/public.key");
        PublicKey publicKey = null;
        try {
            byte[] publicKeyBytes = Files.readAllBytes(publicKeyFile.toPath());
            KeyFactory keyFactory = KeyFactory.getInstance("RSA");
            EncodedKeySpec publicKeySpec = new X509EncodedKeySpec(publicKeyBytes);
            publicKey = keyFactory.generatePublic(publicKeySpec);
        } catch (IOException | InvalidKeySpecException | NoSuchAlgorithmException e) {
            log.info("an error occured obtaining key");
            log.info(e.getMessage());
        }
        return publicKey;
    }

    private PrivateKey getPrivateKey() {
        File privateKeyFile = new File("src/main/resources/private.key");
        PrivateKey privateKey = null;
        try {
            byte[] privateKeyBytes = Files.readAllBytes(privateKeyFile.toPath());
            KeyFactory keyFactory = KeyFactory.getInstance("RSA");
            EncodedKeySpec privateKeySpec = new PKCS8EncodedKeySpec(privateKeyBytes);
            privateKey = keyFactory.generatePrivate(privateKeySpec);
        } catch (IOException | InvalidKeySpecException | NoSuchAlgorithmException e) {
            log.info("an error occured obtaining key");
            log.info(e.getMessage());
        }
        return privateKey;
    }