First Commit - Source Code from Reply

dbcmnpsrc/FE/mnpdev/sim/sistemi/src/tools/Decrypter.java

@@ -0,0 +1,67 @@
+package tools;
+
+import javax.crypto.Cipher;
+import javax.crypto.SecretKey;
+import javax.crypto.SecretKeyFactory;
+import javax.crypto.IllegalBlockSizeException;
+import javax.crypto.spec.PBEKeySpec;
+import javax.crypto.spec.PBEParameterSpec;
+import java.security.spec.KeySpec;
+import java.security.spec.AlgorithmParameterSpec;
+import java.io.UnsupportedEncodingException;
+
+public class Decrypter {
+        Cipher ecipher;
+        Cipher dcipher;
+    
+        // 8-byte Salt
+        byte[] salt = {
+            (byte)0xA9, (byte)0x9B, (byte)0xC8, (byte)0x32,
+            (byte)0x56, (byte)0x35, (byte)0xE3, (byte)0x03
+        };
+    
+        // Iteration count
+        int iterationCount = 19;
+    
+        public Decrypter() {
+            try {
+                // Create the key
+                String passPhrase = "generate a key!";
+                KeySpec keySpec = new PBEKeySpec(passPhrase.toCharArray(), salt, iterationCount);
+                SecretKey key = SecretKeyFactory.getInstance(
+                    "PBEWithMD5AndDES").generateSecret(keySpec);
+                ecipher = Cipher.getInstance(key.getAlgorithm());
+                dcipher = Cipher.getInstance(key.getAlgorithm());
+    
+                // Prepare the parameter to the ciphers
+                AlgorithmParameterSpec paramSpec = new PBEParameterSpec(salt, iterationCount);
+    
+                // Create the ciphers
+                ecipher.init(Cipher.ENCRYPT_MODE, key, paramSpec);
+                dcipher.init(Cipher.DECRYPT_MODE, key, paramSpec);
+            } catch (java.security.InvalidAlgorithmParameterException e) {
+            } catch (java.security.spec.InvalidKeySpecException e) {
+            } catch (javax.crypto.NoSuchPaddingException e) {
+            } catch (java.security.NoSuchAlgorithmException e) {
+            } catch (java.security.InvalidKeyException e) {
+            }
+        }
+
+    public String decrypt(String str) {
+            try {
+                // Decode base64 to get bytes
+                byte[] dec = new sun.misc.BASE64Decoder().decodeBuffer(str);
+
+                // Decrypt
+                byte[] utf8 = dcipher.doFinal(dec);
+
+                // Decode using utf-8
+                return new String(utf8, "UTF8");
+            } catch (javax.crypto.BadPaddingException e) {
+            } catch (IllegalBlockSizeException e) {
+            } catch (UnsupportedEncodingException e) {
+            } catch (java.io.IOException e) {
+            }
+            return null;
+        }
+    }