add cryptography static helper

Author: ghorbani-m

android/src/main/java/land/fx/fula/Cryptography.java

@@ -0,0 +1,44 @@
+package land.fx.fula;
+
+import android.util.Base64;
+
+import java.io.UnsupportedEncodingException;
+import java.security.InvalidAlgorithmParameterException;
+import java.security.InvalidKeyException;
+import java.security.NoSuchAlgorithmException;
+import java.security.spec.InvalidKeySpecException;
+import java.security.spec.InvalidParameterSpecException;
+
+import javax.crypto.BadPaddingException;
+import javax.crypto.Cipher;
+import javax.crypto.IllegalBlockSizeException;
+import javax.crypto.NoSuchPaddingException;
+import javax.crypto.SecretKey;
+import javax.crypto.spec.SecretKeySpec;
+
+public class Cryptography {
+ public static String encryptMsg(String message, SecretKey secret)
+ throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, InvalidParameterSpecException, IllegalBlockSizeException, BadPaddingException, UnsupportedEncodingException {
+ Cipher cipher = null;
+ cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
+ cipher.init(Cipher.ENCRYPT_MODE, secret);
+ byte[] cipherText = cipher.doFinal(message.getBytes("UTF-8"));
+ return Base64.encodeToString(cipherText, Base64.NO_WRAP);
+ }
+ public static String decryptMsg(String cipherText, SecretKey secret)
+ throws NoSuchPaddingException, NoSuchAlgorithmException, InvalidParameterSpecException, InvalidAlgorithmParameterException, InvalidKeyException, BadPaddingException, IllegalBlockSizeException, UnsupportedEncodingException {
+ Cipher cipher = null;
+ cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
+ cipher.init(Cipher.DECRYPT_MODE, secret);
+ byte[] decode = Base64.decode(cipherText, Base64.NO_WRAP);
+ String decryptString = new String(cipher.doFinal(decode), "UTF-8");
+ return decryptString;
+ }
+ public static SecretKey generateKey(String key)
+ throws NoSuchAlgorithmException, InvalidKeySpecException
+ {
+ SecretKeySpec secret;
+ secret = new SecretKeySpec(key.getBytes(), "AES");
+ return secret;
+ }
+}