add generatePairingKey

app/src/main/java/im/status/applet_installer_test/appletinstaller/Crypto.java

@@ -1,16 +1,22 @@
 package im.status.applet_installer_test.appletinstaller;
 
+import org.spongycastle.util.encoders.Hex;
+
 import java.security.GeneralSecurityException;
 import java.security.InvalidAlgorithmParameterException;
 import java.security.InvalidKeyException;
 import java.security.NoSuchAlgorithmException;
+import java.security.spec.InvalidKeySpecException;
 import java.util.Arrays;
 
 import javax.crypto.BadPaddingException;
 import javax.crypto.Cipher;
 import javax.crypto.IllegalBlockSizeException;
 import javax.crypto.NoSuchPaddingException;
+import javax.crypto.SecretKey;
+import javax.crypto.SecretKeyFactory;
 import javax.crypto.spec.IvParameterSpec;
+import javax.crypto.spec.PBEKeySpec;
 import javax.crypto.spec.SecretKeySpec;
 
 
@@ -125,4 +131,13 @@ public class Crypto {
             throw new RuntimeException("error generating ICV.", e);
         }
     }
+
+    public static byte[] generatePairingKey(char[] pairing) throws NoSuchAlgorithmException, InvalidKeySpecException {
+        SecretKeyFactory skf = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA256");
+        String salt = "Status Hardware Wallet Lite";
+        PBEKeySpec spec = new PBEKeySpec(pairing, salt.getBytes(), 50000, 32*8);
+        SecretKey key = skf.generateSecret(spec);
+
+        return key.getEncoded();
+    }
 }

app/src/test/java/im/status/applet_installer_test/appletinstaller/CryptoTest.java

@@ -1,6 +1,11 @@
 package im.status.applet_installer_test.appletinstaller;
 
 import org.junit.Test;
+import org.spongycastle.util.encoders.Hex;
+
+import java.security.InvalidAlgorithmParameterException;
+import java.security.NoSuchAlgorithmException;
+import java.security.spec.InvalidKeySpecException;
 
 import static org.junit.Assert.*;
 import im.status.applet_installer_test.appletinstaller.apducommands.InitializeUpdate;
@@ -50,4 +55,12 @@ public class CryptoTest {
         byte[] result = Crypto.macFull3des(key, data, Crypto.NullBytes8);
         assertEquals(expected, HexUtils.byteArrayToHexString(result));
     }
+
+    @Test
+    public void generatePairingKey() throws NoSuchAlgorithmException, InvalidKeySpecException {
+        String pairing = "zoynhcfz1xJjYqxO";
+        byte[] key = Crypto.generatePairingKey(pairing.toCharArray());
+        String expected = "BF8D606E2FE9292B633DF5E31563AF88928EEBB71FDBCBEF6CADECAA00D7874F";
+        assertEquals(expected, HexUtils.byteArrayToHexString(key));
+    }
 }