Helper FunctionsΒΆ

The following Java functions use the Spongy Castle library.

Helper Functions:

public static PublicKey getRSAPublicKeyFromString(String apiKey) throws Exception{
    KeyFactory keyFactory = KeyFactory.getInstance("RSA", "SC");
    byte[] publicKeyBytes = Base64.decode(apiKey.getBytes("UTF-8"), Base64.DEFAULT);
    X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(publicKeyBytes);
    return keyFactory.generatePublic(x509KeySpec);

public static PrivateKey getRSAPrivateKeyFromString(String key) throws Exception {
    byte [] clear = Base64.decode(key, Base64.DEFAULT);
    PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(clear);
    KeyFactory fact = KeyFactory.getInstance("RSA", "SC");
    PrivateKey priv = fact.generatePrivate(keySpec);
    Arrays.fill(clear, (byte) 0);
    return priv;

public static String stripPublicKeyHeaders(String key) {
        //strip the headers from the key string
        StringBuilder strippedKey = new StringBuilder();
        String lines[] = key.split("\n");
        for(String line : lines) {
            if(!line.contains("BEGIN PUBLIC KEY") && !line.contains("END PUBLIC KEY")) {
        return strippedKey.toString().trim();

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