From c87ffe9bfa539b1f91613723b51d3afe9f506246 Mon Sep 17 00:00:00 2001
From: Elizabeth Cray <liz@cray.software>
Date: Mon, 10 Mar 2025 13:56:43 -0400
Subject: [PATCH] Begin porting example to JC221

---
 .gitignore                                   |  2 +
 pom.xml                                      | 42 ++++++++++++++++++++
 src/main/java/org/hacdc/crystal/Crystal.java | 14 +++++++
 3 files changed, 58 insertions(+)
 create mode 100644 pom.xml

diff --git a/.gitignore b/.gitignore
index e87ca6f..fd5de9f 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,3 +4,5 @@ tools/
 *.cap
 *.class
 *.jar
+target/
+.vscode/
diff --git a/pom.xml b/pom.xml
new file mode 100644
index 0000000..4405e86
--- /dev/null
+++ b/pom.xml
@@ -0,0 +1,42 @@
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+  <groupId>org.hacdc.crystal</groupId>
+  <artifactId>crystal</artifactId>
+  <version>1.0-ALPHA</version>
+  <name>crystal</name>
+  <url>https://wiki.hacdc.org</url>
+
+  <dependencies>
+    <dependency>
+      <groupId>org.bouncycastle</groupId>
+      <artifactId>bcprov-jdk18on</artifactId>
+      <version>1.80</version>
+    </dependency>
+  </dependencies>
+
+  <build>
+    <plugins>
+      <plugin>
+        <artifactId>maven-antrun-plugin</artifactId>
+        <version>3.1.0</version>
+        <executions>
+          <execution>
+            <phase>generate-sources</phase>
+            <configuration>
+              <target>
+                <ant antfile="${basedir}/build.xml" inheritAll="false">
+                  <target name="build"/>
+                </ant>
+              </target>
+            </configuration>
+            <goals>
+              <goal>run</goal>
+            </goals>
+          </execution>
+        </executions>
+      </plugin>
+    </plugins>
+  </build>
+</project>
diff --git a/src/main/java/org/hacdc/crystal/Crystal.java b/src/main/java/org/hacdc/crystal/Crystal.java
index 462e1a0..e8fb9e7 100644
--- a/src/main/java/org/hacdc/crystal/Crystal.java
+++ b/src/main/java/org/hacdc/crystal/Crystal.java
@@ -30,6 +30,20 @@ public class Crystal extends Applet {
 
     private void processCMD1(APDU apdu) throws ISOException {
         // Process command 1
+        short len = apdu.setIncomingAndReceive();
+        byte[] buffer = apdu.getBuffer();
+        short offset = apdu.getOffsetCdata();
+		byte p1 = buffer[ISO7816.OFFSET_P1]; // 00, could encode further parameters for CMD1 here
+		byte p2 = buffer[ISO7816.OFFSET_P2]; // 00, could encode further parameters for CMD2 here
+        if (p1 == 0x00 && p2 == 0x00) {
+			if (len != 16) {
+				ISOException.throwIt(ISO7816.SW_WRONG_LENGTH);
+			} else {
+				apdu.setOutgoingAndSend(dataOffset, (short)16);
+			}
+		} else {
+			ISOException.throwIt(ISO7816.SW_INCORRECT_P1P2);
+		}
         return;
     }
 }