basic wallet class, xor encrytion with axample

src/main/java/hu/saborsoft/blockchain/example/password/XORExample.java

@@ -0,0 +1,25 @@
+package hu.saborsoft.blockchain.example.password;
+
+import hu.saborsoft.blockchain.support.UtilityMethods;
+
+public class XORExample {
+
+    public static void main(String[] args) {
+        String message = "At the most beautiful you."
+                + "remember the most beautiful you.";
+        String password = "blockchains";
+        byte[] encry = UtilityMethods.encryptionByXOR(message.getBytes(), password);
+        // take a peak at the encrypted data.
+        System.out.println(new String(encry));
+        byte[] decrypted = UtilityMethods.decryptionByXOR(encry, password);
+        System.out.println("after proper decryption, the message is:\n");
+        System.out.println(new String(decrypted));
+        System.out.println("\nwith an incorrect password, "
+        + "the decrypted message looks like:");
+        // let's try an incorrect password.
+        decrypted = UtilityMethods.decryptionByXOR(encry, "Block Chain");
+        // examine the wrongly decrypted message
+        System.out.println(new String(decrypted));
+    }
+
+}

src/main/java/hu/saborsoft/blockchain/support/UtilityMethods.java

@@ -146,4 +146,29 @@ public static void displayTransaction(Transaction t, PrintStream out, int level)
         displayTab(out, level, "}");
     }
 
+    public static byte[] encryptionByXOR(byte[] key, String password) {
+        int more = 100;
+        byte[] p = messageDigestSHA256ToBytes(password);
+        byte[] pwds = new byte[p.length * more];
+        for (int i = 0, z = 0; i < more; i++) {
+            for (int j = 0; j < p.length; j++, z++) {
+                pwds[z] = p[j];
+            }
+        }
+        byte[] result = new byte[key.length];
+        int i;
+        for (i = 0; i < key.length && i < pwds.length; i++) {
+            result[i] = (byte) ((key[i] ^ pwds[i]) & 0xFF);
+        }
+        while (i < key.length) {
+            result[i] = key[i];
+            i++;
+        }
+        return result;
+    }
+
+    public static byte[] decryptionByXOR(byte[] key, String password) {
+        return encryptionByXOR(key, password);
+    }
+
 }

src/main/java/hu/saborsoft/blockchain/wallet/Wallet.java

@@ -0,0 +1,32 @@
+package hu.saborsoft.blockchain.wallet;
+
+import hu.saborsoft.blockchain.support.UtilityMethods;
+
+import java.security.KeyPair;
+import java.security.PrivateKey;
+import java.security.PublicKey;
+
+public class Wallet {
+
+    private KeyPair keyPair;
+
+    private String walletName;
+
+    public Wallet(String walletName) {
+        keyPair = UtilityMethods.generateKeyPair(2048);
+        this.walletName = walletName;
+    }
+
+    public String getName() {
+        return walletName;
+    }
+
+    public PublicKey getPublicKey() {
+        return keyPair.getPublic();
+    }
+
+    public PrivateKey getPrivateKey() {
+        return keyPair.getPrivate();
+    }
+
+}