Java 17 support

.github/workflows/maven.yml

@@ -0,0 +1,31 @@
+name: Java CI
+
+on:
+  push:
+    branches: [ gluon ]
+  pull_request:
+    branches: [ gluon ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    env:
+      JAVA_VERSION: 17
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: 'Download OpenJDK'
+      run: |
+        wget --no-verbose \
+          --directory-prefix ${{ runner.temp }} \
+          https://download.java.net/java/GA/jdk17/0d483333a00540d886896bac774ff48b/35/GPL/openjdk-17_linux-x64_bin.tar.gz
+    - name: Setup java
+      uses: actions/setup-java@v2
+      with:
+        java-version: ${{ env.JAVA_VERSION }}
+        distribution: jdkfile
+        jdkFile: ${{ runner.temp }}/openjdk-${{ env.JAVA_VERSION }}_linux-x64_bin.tar.gz
+    - name: Build with Maven
+      run: mvn clean install

common/src/main/java/org/whispersystems/curve25519/Curve25519.java

@@ -156,6 +156,18 @@ public byte[] verifyVrfSignature(byte[] publicKey, byte[] message, byte[] signat
     return provider.verifyVrfSignature(publicKey, message, signature);
   }
 
+  /**
+   * Create a public key from the bytes used to generate a private key
+   *
+   * @param privateKey the bytes used for a private key
+   *
+   * @return the bytes for the public key, not containing a type.
+   */
+  public byte[] createPublicKeyFromPrivateKey(byte[] privateKey) {
+    byte[] publicKey  = provider.generatePublicKey(privateKey);
+    return publicKey;
+  }
+
   private static Curve25519Provider constructNativeProvider(SecureRandomProvider random) throws NoSuchProviderException {
     return constructClass("NativeCurve25519Provider", random);
   }