[Bug] Fix InstallPluginCommand to use proper key signatures (#1233)

The public key has changed since the initial release. This commit fixes the
public key and uses the .sig files that are published to the artifacts site.

Signed-off-by: Nicholas Walter Knize <nknize@apache.org>

distribution/tools/plugin-cli/src/main/java/org/opensearch/plugins/InstallPluginCommand.java

@@ -605,7 +605,7 @@ class InstallPluginCommand extends EnvironmentAwareCommand {
 
     /**
      * Verify the signature of the downloaded plugin ZIP. The signature is obtained from the source of the downloaded plugin by appending
-     * ".asc" to the URL. It is expected that the plugin is signed with the OpenSearch signing key with ID 0934A65836A51424.
+     * ".sig" to the URL. It is expected that the plugin is signed with the OpenSearch signing key with ID C2EE2AF6542C03B4.
      *
      * @param zip       the path to the downloaded plugin ZIP
      * @param urlString the URL source of the downloade plugin ZIP
@@ -613,13 +613,13 @@ class InstallPluginCommand extends EnvironmentAwareCommand {
      * @throws PGPException if the PGP implementation throws an internal exception during verification
      */
     void verifySignature(final Path zip, final String urlString) throws IOException, PGPException {
-        final String ascUrlString = urlString + ".asc";
-        final URL ascUrl = openUrl(ascUrlString);
+        final String sigUrlString = urlString + ".sig";
+        final URL sigUrl = openUrl(sigUrlString);
         try (
             // fin is a file stream over the downloaded plugin zip whose signature to verify
             InputStream fin = pluginZipInputStream(zip);
             // sin is a URL stream to the signature corresponding to the downloaded plugin zip
-            InputStream sin = urlOpenStream(ascUrl);
+            InputStream sin = urlOpenStream(sigUrl);
             // ain is a input stream to the public key in ASCII-Armor format (RFC4880)
             InputStream ain = new ArmoredInputStream(getPublicKey())
         ) {
@@ -666,7 +666,7 @@ class InstallPluginCommand extends EnvironmentAwareCommand {
      * @return the public key ID
      */
     String getPublicKeyId() {
-        return "0934A65836A51424";
+        return "C2EE2AF6542C03B4";
     }
 
     /**
@@ -675,7 +675,7 @@ class InstallPluginCommand extends EnvironmentAwareCommand {
      * @return an input stream to the public key
      */
     InputStream getPublicKey() {
-        return InstallPluginCommand.class.getResourceAsStream("/public_key.asc");
+        return InstallPluginCommand.class.getResourceAsStream("/public_key.sig");
     }
 
     /**

distribution/tools/plugin-cli/src/main/resources/public_key.asc

@@ -1,52 +0,0 @@
------BEGIN PGP PUBLIC KEY BLOCK-----
-
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-=w4j8
------END PGP PUBLIC KEY BLOCK-----

distribution/tools/plugin-cli/src/main/resources/public_key.sig

@@ -0,0 +1,51 @@
+-----BEGIN PGP PUBLIC KEY BLOCK-----
+
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distribution/tools/plugin-cli/src/test/java/org/opensearch/plugins/InstallPluginCommandTests.java

@@ -935,8 +935,8 @@ public class InstallPluginCommandTests extends OpenSearchTestCase {
                     String checksum = shaCalculator.apply(zipbytes);
                     Files.write(shaFile, checksum.getBytes(StandardCharsets.UTF_8));
                     return shaFile.toUri().toURL();
-                } else if ((url + ".asc").equals(urlString)) {
-                    final Path ascFile = temp.apply("asc").resolve("downloaded.zip" + ".asc");
+                } else if ((url + ".sig").equals(urlString)) {
+                    final Path ascFile = temp.apply("sig").resolve("downloaded.zip" + ".sig");
                     final byte[] zipBytes = Files.readAllBytes(pluginZip);
                     final String asc = signature.apply(zipBytes, secretKey);
                     Files.write(ascFile, asc.getBytes(StandardCharsets.UTF_8));