spongycastle

I've been strugling with proguard to make Spongycastle work. Most of the time, the problem comes when I'm exporting a signed APK, either I've got error, or the app will just crash before starting. So, I've managed to gather informations to get a working proguard configuration : -optimizationpasses 5 -dontusemixedcaseclassnames -dontskipnonpubliclibraryclasses -dontskipnonpubliclibraryclassmembers -dontpreverify -verbose -repackageclasses '' -allowaccessmodification -keepattributes *Annotation* -optimizations !code/simplification/arithmetic -libraryjars C:\Program Files\Java\jre7\lib\rt.jar

I've been trying to create an instance of java.security.PublicKey using a Base64 encoded ECC public key. MainActivity.java @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); try { byte[] data = decodePublicKey("AsIAEFjzIcX+Kvhe8AmLoGUc8aYAEAwf5ecREGZ2u4RLxQuav/A="); PublicKey publicKey = loadPublicKey("secp128r1", data); Log.d(TAG, publicKey.toString()); } catch (SQLException | IOException | GeneralSecurityException e) { Log.e(TAG, e.getMessage(), e); } } private byte[] decodePublicKey(String s) throws

If I understand the situation correctly, SpongyCastle is a renaming of BouncyCastle and it was created to give people the ability to include a new version of BouncyCastle on Android, since just including the latest BouncyCastle jar would cause conflicts with the old and stripped down version of BouncyCastle that came with Android. However, apparently since version 3.0 (in 2011 - 6 years ago!) the Android BouncyCastle package was renamed to com.android.org.bouncycastle , so that now if you included the regular org.bouncycastle , this would no longer conflict with the pre-packaged stripped down

I am trying to implement ECC algorithm on Android. I am currently using spongy castle to implement it. The key generation cone snippet is as follows : KeyPairGenerator kpg = null; try { kpg = KeyPairGenerator.getInstance("ECIES");// Do i have to do any changes here? } catch (NoSuchAlgorithmException e) { e.printStackTrace(); } ECGenParameterSpec brainpoolP160R1 = new ECGenParameterSpec("brainpoolP160R1"); try { kpg.initialize(brainpoolP160R1); } catch (InvalidAlgorithmParameterException) { } KeyPair kp = kpg.generateKeyPair(); PublicKey publicKey = kp.getPublic(); PrivateKey privateKey = kp

So I'm using Spongy Castle (Android) to generate a PEM encoded string for an RSA public key that will be uploaded to a server. This is what I'm currently doing: PublicKey publicKey = keyPair.getPublic(); StringWriter writer = new StringWriter(); PemWriter pemWriter = new PemWriter(writer); pemWriter.writeObject(new PemObject("RSA PUBLIC KEY", publicKey.getEncoded())); pemWriter.flush(); pemWriter.close(); return writer.toString(); Now as you can probably tell I'm not sure how to construct the PemObject or if there is an easier way to do this. When using Bouncy Case I used to do this like this

I am trying to generate a shared secret in my app like this: public static byte[] generateSharedSecret(PrivateKey privateKey PublicKey publicKey) { KeyAgreement keyAgreement = KeyAgreement.getInstance("ECDH", "SC"); keyAgreement.init(privateKey); keyAgreement.doPhase(publicKey, true); return keyAgreement.generateSecret(); } This is working fine, but the PublicKey I use here should be coming from the backend. The backend just sends me the x and y value of a point on an elliptic curve and now I am supposed to generate the PublicKey from that. But I just can't figure it out! How can I create a

I have two PublicKey object.I want to compare both for equality or to check which is latest object using java security API or bouncy castle API.How can i achieve this? You can use equals if (!key.equals(copyKey)){ System.out.println("not equals!"); } or check the hashcode of the keys if (key.hashCode() != copyKey.hashCode()) { System.out.println("public key hashCode check failed"); } or compare the hex string of the two public keys String encodedKey1 = new String(Hex.encode(key1.getEncoded())); String encodedKey2 = new String(Hex.encode(key2.getEncoded())); if (!encodedKey1.equals(encodedKey2)