Add a GitHub action to test the content snap

.github/workflows/snaptest.yml

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+name: Java CI with Maven
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "**" ]
+
+jobs:
+  build:
+    runs-on: ubuntu-22.04
+    steps:
+    - uses: actions/checkout@v4
+    - name: Install snapcraft
+      run: sudo snap install snapcraft
+    - name: Build openssl-fips-java snap
+      run: sudo snapcraft
+    - name: Install openssl-fips-java snap
+      run: sudo snap install --dangerous ./openssl-fips-java_0.0.1_amd64.snap
+    - name: Build sample consumer snap
+      run: |
+        cd ${{ github.workspace }}/src/test/consumer-snap
+        sudo snapcraft
+        sudo snap install --dangerous ./kem-test_1.0_amd64.snap 
+        cd ${{ github.workspace }}
+    - name: Connect snaps
+      run: sudo snap connect kem-test:openssl-fips-provider-jar openssl-fips-java:openssl-fips-provider-jar
+    - name: Run kem-test
+      run: kem-test
+
+
+

src/test/consumer-snap/KEMTest.java

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+import java.security.KeyPair;
+import java.security.PublicKey;
+import java.security.PrivateKey;
+import java.util.Arrays;
+import java.security.KeyPairGenerator;
+import javax.crypto.KEM;
+import javax.crypto.KEM.Encapsulated;
+import javax.crypto.KEM.Encapsulator;
+import javax.crypto.KEM.Decapsulator;
+import javax.crypto.SecretKey;
+import java.security.Security;
+
+
+public class KEMTest {
+    public static void main(String[] args) throws Exception {
+        String cname = "com.canonical.openssl.provider.OpenSSLFIPSProvider";
+        Security.addProvider((java.security.Provider) Class.forName(cname).newInstance());
+
+        KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA");
+        kpg.initialize(4096);
+
+        // Alice creates a key pair and shares the public key with Bob
+        KeyPair aliceKeys = kpg.generateKeyPair();
+        PublicKey alicePublicKey = aliceKeys.getPublic();
+        PrivateKey alicePrivateKey = aliceKeys.getPrivate();
+
+        // Bob generates a shared secret and wraps it using Alice's public key
+        KEM bobKem = KEM.getInstance("RSA", "OpenSSLFIPSProvider");
+        Encapsulator encapsulator = bobKem.newEncapsulator(alicePublicKey, null, null);
+        int secretSize = encapsulator.secretSize();
+        KEM.Encapsulated encapsulated = encapsulator.encapsulate(0, secretSize, "AES");
+        SecretKey bobSecret = encapsulated.key();
+
+        // Bob sends the encapsulated secret to Alice
+        // Alice uses her RSA private key to unwrap the shared secret
+        KEM aliceKem = KEM.getInstance("RSA", "OpenSSLFIPSProvider");
+        Decapsulator decapsulator = aliceKem.newDecapsulator(alicePrivateKey, null);
+        byte[] encapsulationBytes = encapsulated.encapsulation();
+        SecretKey aliceSecret = decapsulator.decapsulate(encapsulationBytes, 0, encapsulationBytes.length, "AES");
+
+        System.out.println(aliceSecret.equals(bobSecret));
+    }
+}