added signature methods

.idea/workspace.xml

@@ -2,8 +2,10 @@
 <project version="4">
   <component name="ChangeListManager">
     <list default="true" id="15cb9d44-2114-4e87-9e35-a3d14b1a4bbd" name="Default" comment="">
-      <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
-      <change beforePath="$PROJECT_DIR$/src/main/java/com/buecoin01/model/Wallet.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/main/java/com/buecoin01/model/Wallet.java" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/src/main/java/com/buecoin01/utility/TransactionInput.java" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/src/main/java/com/buecoin01/utility/TransactionOutput.java" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/src/main/java/com/buecoin01/model/Transaction.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/main/java/com/buecoin01/model/Transaction.java" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/src/main/java/com/buecoin01/utility/Encryption.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/main/java/com/buecoin01/utility/Encryption.java" afterDir="false" />
     </list>
     <ignored path="$PROJECT_DIR$/target/" />
     <option name="EXCLUDED_CONVERTED_TO_IGNORED" value="true" />
@@ -15,11 +17,11 @@
   </component>
   <component name="FileEditorManager">
     <leaf>
-      <file leaf-file-name="Wallet.java" pinned="false" current-in-tab="true">
+      <file leaf-file-name="Wallet.java" pinned="false" current-in-tab="false">
         <entry file="file://$PROJECT_DIR$/src/main/java/com/buecoin01/model/Wallet.java">
           <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="446">
-              <caret line="68" selection-start-line="68" selection-end-line="68" />
+            <state relative-caret-position="105">
+              <caret line="7" column="13" selection-start-line="7" selection-start-column="13" selection-end-line="7" selection-end-column="13" />
               <folding>
                 <element signature="imports" expanded="true" />
                 <element signature="e#549#550#0" expanded="true" />
@@ -29,6 +31,49 @@
           </provider>
         </entry>
       </file>
+      <file leaf-file-name="Transaction.java" pinned="false" current-in-tab="false">
+        <entry file="file://$PROJECT_DIR$/src/main/java/com/buecoin01/model/Transaction.java">
+          <provider selected="true" editor-type-id="text-editor">
+            <state relative-caret-position="270">
+              <caret line="18" column="40" selection-start-line="18" selection-start-column="40" selection-end-line="18" selection-end-column="40" />
+              <folding>
+                <element signature="imports" expanded="true" />
+              </folding>
+            </state>
+          </provider>
+        </entry>
+      </file>
+      <file leaf-file-name="TransactionInput.java" pinned="false" current-in-tab="false">
+        <entry file="file://$PROJECT_DIR$/src/main/java/com/buecoin01/utility/TransactionInput.java">
+          <provider selected="true" editor-type-id="text-editor">
+            <state relative-caret-position="30">
+              <caret line="2" column="29" selection-start-line="2" selection-start-column="29" selection-end-line="2" selection-end-column="29" />
+            </state>
+          </provider>
+        </entry>
+      </file>
+      <file leaf-file-name="TransactionOutput.java" pinned="false" current-in-tab="false">
+        <entry file="file://$PROJECT_DIR$/src/main/java/com/buecoin01/utility/TransactionOutput.java">
+          <provider selected="true" editor-type-id="text-editor">
+            <state relative-caret-position="30">
+              <caret line="2" column="30" selection-start-line="2" selection-start-column="30" selection-end-line="2" selection-end-column="30" />
+            </state>
+          </provider>
+        </entry>
+      </file>
+      <file leaf-file-name="Encryption.java" pinned="false" current-in-tab="true">
+        <entry file="file://$PROJECT_DIR$/src/main/java/com/buecoin01/utility/Encryption.java">
+          <provider selected="true" editor-type-id="text-editor">
+            <state relative-caret-position="223">
+              <caret line="30" column="32" lean-forward="true" selection-start-line="30" selection-start-column="32" selection-end-line="30" selection-end-column="32" />
+              <folding>
+                <element signature="e#1683#1684#0" expanded="true" />
+                <element signature="e#1724#1725#0" expanded="true" />
+              </folding>
+            </state>
+          </provider>
+        </entry>
+      </file>
       <file leaf-file-name="Blockchain.java" pinned="false" current-in-tab="false">
         <entry file="file://$PROJECT_DIR$/src/main/java/com/buecoin01/model/Blockchain.java">
           <provider selected="true" editor-type-id="text-editor">
@@ -40,6 +85,13 @@
       </file>
     </leaf>
   </component>
+  <component name="FileTemplateManagerImpl">
+    <option name="RECENT_TEMPLATES">
+      <list>
+        <option value="Class" />
+      </list>
+    </option>
+  </component>
   <component name="Git.Settings">
     <option name="RECENT_GIT_ROOT_PATH" value="$PROJECT_DIR$" />
   </component>
@@ -54,6 +106,8 @@
     <option name="CHANGED_PATHS">
       <list>
         <option value="$PROJECT_DIR$/src/main/java/com/buecoin01/model/Wallet.java" />
+        <option value="$PROJECT_DIR$/src/main/java/com/buecoin01/utility/Encryption.java" />
+        <option value="$PROJECT_DIR$/src/main/java/com/buecoin01/model/Transaction.java" />
       </list>
     </option>
   </component>
@@ -219,15 +273,16 @@
       <option name="number" value="Default" />
       <option name="presentableId" value="Default" />
       <updated>1532353115597</updated>
-      <workItem from="1532353121145" duration="2380000" />
+      <workItem from="1532353121145" duration="5067000" />
     </task>
     <servers />
   </component>
   <component name="TimeTrackingManager">
-    <option name="totallyTimeSpent" value="2380000" />
+    <option name="totallyTimeSpent" value="5067000" />
   </component>
   <component name="ToolWindowManager">
     <frame x="-57" y="-1047" width="1832" height="903" extended-state="0" />
+    <editor active="true" />
     <layout>
       <window_info anchor="right" id="Palette" />
       <window_info anchor="bottom" id="Event Log" side_tool="true" />
@@ -248,8 +303,8 @@
       <window_info anchor="bottom" id="Run" order="2" />
       <window_info anchor="bottom" id="Version Control" />
       <window_info anchor="bottom" id="Spring" />
-      <window_info active="true" anchor="bottom" id="Terminal" visible="true" weight="0.3287841" />
-      <window_info content_ui="combo" id="Project" order="0" visible="true" weight="0.19497207" />
+      <window_info anchor="bottom" id="Terminal" visible="true" weight="0.3287841" />
+      <window_info active="true" content_ui="combo" id="Project" order="0" visible="true" weight="0.19497207" />
       <window_info anchor="right" id="Bean Validation" />
       <window_info id="Web" side_tool="true" />
       <window_info anchor="right" id="Theme Preview" />
@@ -297,10 +352,24 @@
         </state>
       </provider>
     </entry>
+    <entry file="file://$PROJECT_DIR$/src/main/java/com/buecoin01/utility/TransactionInput.java">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="30">
+          <caret line="2" column="29" selection-start-line="2" selection-start-column="29" selection-end-line="2" selection-end-column="29" />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/main/java/com/buecoin01/utility/TransactionOutput.java">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="30">
+          <caret line="2" column="30" selection-start-line="2" selection-start-column="30" selection-end-line="2" selection-end-column="30" />
+        </state>
+      </provider>
+    </entry>
     <entry file="file://$PROJECT_DIR$/src/main/java/com/buecoin01/model/Wallet.java">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="446">
-          <caret line="68" selection-start-line="68" selection-end-line="68" />
+        <state relative-caret-position="105">
+          <caret line="7" column="13" selection-start-line="7" selection-start-column="13" selection-end-line="7" selection-end-column="13" />
           <folding>
             <element signature="imports" expanded="true" />
             <element signature="e#549#550#0" expanded="true" />
@@ -309,6 +378,27 @@
         </state>
       </provider>
     </entry>
+    <entry file="file://$PROJECT_DIR$/src/main/java/com/buecoin01/model/Transaction.java">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="270">
+          <caret line="18" column="40" selection-start-line="18" selection-start-column="40" selection-end-line="18" selection-end-column="40" />
+          <folding>
+            <element signature="imports" expanded="true" />
+          </folding>
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/src/main/java/com/buecoin01/utility/Encryption.java">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="223">
+          <caret line="30" column="32" lean-forward="true" selection-start-line="30" selection-start-column="32" selection-end-line="30" selection-end-column="32" />
+          <folding>
+            <element signature="e#1683#1684#0" expanded="true" />
+            <element signature="e#1724#1725#0" expanded="true" />
+          </folding>
+        </state>
+      </provider>
+    </entry>
   </component>
   <component name="masterDetails">
     <states>

src/main/java/com/buecoin01/model/Transaction.java

@@ -1,9 +1,12 @@
 package com.buecoin01.model;
 
 import com.buecoin01.utility.Encryption;
+import com.buecoin01.utility.TransactionInput;
+import com.buecoin01.utility.TransactionOutput;
 
 import java.security.PublicKey;
 import java.util.ArrayList;
+import java.util.List;
 
 public class Transaction {
     private String transactionId; //hash of the transaction

src/main/java/com/buecoin01/utility/Encryption.java

@@ -3,6 +3,11 @@ package com.buecoin01.utility;
 import com.google.common.hash.Hashing;
 
 import java.nio.charset.StandardCharsets;
+import java.security.Key;
+import java.security.PrivateKey;
+import java.security.PublicKey;
+import java.security.Signature;
+import java.util.Base64;
 
 public class Encryption {
     public static String applySha256(String input) {
@@ -14,4 +19,37 @@ public class Encryption {
     public static String createTarget(int difficulty) {
         return new String(new char[difficulty]).replace('\0', '0');
     }
+
+    //Apply ECDSA Signature and return result as bytes
+    public static byte[] applyECDSASig(PrivateKey privateKey, String input) {
+        Signature dsa;
+        byte[] realSig = new byte[0];
+        try {
+            dsa = Signature.getInstance("ECDSA","BC");
+            dsa.initSign(privateKey);
+            byte[] strByte = input.getBytes();
+            dsa.update(strByte);
+            realSig = dsa.sign();
+        } catch (Exception e) {
+            throw new RuntimeException(e);
+        }
+        return realSig;
+    }
+
+    //Verify a String Signature
+    public static boolean verifyECDSASig(PublicKey publicKey, String data, byte[] signature) {
+        try {
+            Signature ecdsaVerify = Signature.getInstance("ECDSA", "BC");
+            ecdsaVerify.initVerify(publicKey);
+            ecdsaVerify.update(data.getBytes());
+            return  ecdsaVerify.verify(signature);
+        } catch (Exception e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    //Return encoded string from a key
+    public static String getStringFromKey(Key key) {
+        return Base64.getEncoder().encodeToString(key.getEncoded());
+    }
 }

src/main/java/com/buecoin01/utility/TransactionInput.java

@@ -0,0 +1,4 @@
+package com.buecoin01.utility;
+
+public class TransactionInput {
+}

src/main/java/com/buecoin01/utility/TransactionOutput.java

@@ -0,0 +1,4 @@
+package com.buecoin01.utility;
+
+public class TransactionOutput {
+}