InvalidKeySpecExeption when loadding the RSA private key from file

Question

I\'m trying to load a private key from file in java. This key is generated by ssh-agent. I\'m actually using the code below:

     public PrivateKey getPrivat         


        

Answer 1

Intstead of removing header and footers from private key file you can use BouncyCastle's Pemreader.

 private PrivateKey getPrivateKeyFromFile(String keyFile) throws IOException, NoSuchAlgorithmException, InvalidKeySpecException {
    final InputStream inputStream = getClass().getClassLoader().getResourceAsStream(keyFile);
    String privateKeySTr = IOUtils.toString(inputStream, String.valueOf(StandardCharsets.UTF_8));

    PemObject pem = new PemReader(new StringReader(privateKeySTr)).readPemObject();
    byte[] der = pem.getContent();
    KeyFactory keyFactory = KeyFactory.getInstance("RSA");
    PKCS8EncodedKeySpec ks = new PKCS8EncodedKeySpec(der);
    RSAPrivateKey privKey = (RSAPrivateKey) keyFactory.generatePrivate(ks);
    return privKey;
}