added signature methods in transaction class

.idea/workspace.xml

@@ -2,10 +2,7 @@
 <project version="4">
   <component name="ChangeListManager">
     <list default="true" id="15cb9d44-2114-4e87-9e35-a3d14b1a4bbd" name="Default" comment="">
-      <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" />
@@ -31,11 +28,11 @@
           </provider>
         </entry>
       </file>
-      <file leaf-file-name="Transaction.java" pinned="false" current-in-tab="false">
+      <file leaf-file-name="Transaction.java" pinned="false" current-in-tab="true">
         <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" />
+            <state relative-caret-position="356">
+              <caret line="48" column="66" lean-forward="true" selection-start-line="48" selection-start-column="66" selection-end-line="48" selection-end-column="66" />
               <folding>
                 <element signature="imports" expanded="true" />
               </folding>
@@ -61,10 +58,10 @@
           </provider>
         </entry>
       </file>
-      <file leaf-file-name="Encryption.java" pinned="false" current-in-tab="true">
+      <file leaf-file-name="Encryption.java" pinned="false" current-in-tab="false">
         <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">
+            <state relative-caret-position="108">
               <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" />
@@ -273,12 +270,12 @@
       <option name="number" value="Default" />
       <option name="presentableId" value="Default" />
       <updated>1532353115597</updated>
-      <workItem from="1532353121145" duration="5067000" />
+      <workItem from="1532353121145" duration="6982000" />
     </task>
     <servers />
   </component>
   <component name="TimeTrackingManager">
-    <option name="totallyTimeSpent" value="5067000" />
+    <option name="totallyTimeSpent" value="6982000" />
   </component>
   <component name="ToolWindowManager">
     <frame x="-57" y="-1047" width="1832" height="903" extended-state="0" />
@@ -378,23 +375,23 @@
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/src/main/java/com/buecoin01/model/Transaction.java">
+    <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="270">
-          <caret line="18" column="40" selection-start-line="18" selection-start-column="40" selection-end-line="18" selection-end-column="40" />
+        <state relative-caret-position="108">
+          <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="imports" expanded="true" />
+            <element signature="e#1683#1684#0" expanded="true" />
+            <element signature="e#1724#1725#0" expanded="true" />
           </folding>
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/src/main/java/com/buecoin01/utility/Encryption.java">
+    <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="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" />
+        <state relative-caret-position="356">
+          <caret line="48" column="66" lean-forward="true" selection-start-line="48" selection-start-column="66" selection-end-line="48" selection-end-column="66" />
           <folding>
-            <element signature="e#1683#1684#0" expanded="true" />
-            <element signature="e#1724#1725#0" expanded="true" />
+            <element signature="imports" expanded="true" />
           </folding>
         </state>
       </provider>

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

@@ -4,6 +4,7 @@ import com.buecoin01.utility.Encryption;
 import com.buecoin01.utility.TransactionInput;
 import com.buecoin01.utility.TransactionOutput;
 
+import java.security.PrivateKey;
 import java.security.PublicKey;
 import java.util.ArrayList;
 import java.util.List;
@@ -36,4 +37,16 @@ public class Transaction {
                        Float.toString(value) + sequence
                        );
     }
+
+    //Sign all the data that should not be tempered
+    public void generateSignature(PrivateKey privateKey) {
+        String data = Encryption.getStringFromKey(sender) + Encryption.getStringFromKey(reciepient) + Float.toString(value);
+        signature = Encryption.applyECDSASig(privateKey, data);
+    }
+
+    //Verify the data we signed hasn't been tampered with
+    public boolean verifySignature() {
+        String data = Encryption.getStringFromKey(sender) + Encryption.getStringFromKey(reciepient) + Float.toString(value);
+        return Encryption.verifyECDSASig(sender, data, signature);
+    }
 }