1 files changed, 106 insertions, 0 deletions

diff --git a/sdnr/wt/oauth-provider/oauth-core/src/main/java/org/onap/ccsdk/features/sdnr/wt/oauthprovider/providers/PemUtils.java b/sdnr/wt/oauth-provider/oauth-core/src/main/java/org/onap/ccsdk/features/sdnr/wt/oauthprovider/providers/PemUtils.java
new file mode 100644
index 000000000..fac46f6b1
--- /dev/null
+++ b/sdnr/wt/oauth-provider/oauth-core/src/main/java/org/onap/ccsdk/features/sdnr/wt/oauthprovider/providers/PemUtils.java
@@ -0,0 +1,106 @@
+/*
+ * ============LICENSE_START=======================================================
+ * ONAP : ccsdk features
+ * ================================================================================
+ * Copyright (C) 2020 highstreet technologies GmbH Intellectual Property.
+ * All rights reserved.
+ * ================================================================================
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * ============LICENSE_END=========================================================
+ *
+ */
+package org.onap.ccsdk.features.sdnr.wt.oauthprovider.providers;
+
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.FileReader;
+import java.io.IOException;
+import java.io.Reader;
+import java.io.StringReader;
+import java.security.KeyFactory;
+import java.security.NoSuchAlgorithmException;
+import java.security.PrivateKey;
+import java.security.PublicKey;
+import java.security.spec.EncodedKeySpec;
+import java.security.spec.InvalidKeySpecException;
+import java.security.spec.PKCS8EncodedKeySpec;
+import java.security.spec.X509EncodedKeySpec;
+import org.bouncycastle.util.io.pem.PemObject;
+import org.bouncycastle.util.io.pem.PemReader;
+
+public class PemUtils {
+
+    private static byte[] parsePEMFile(File pemFile) throws IOException {
+        if (!pemFile.isFile() || !pemFile.exists()) {
+            throw new FileNotFoundException(String.format("The file '%s' doesn't exist.", pemFile.getAbsolutePath()));
+        }
+        return parsePEMFile(new FileReader(pemFile));
+    }
+    private static byte[] parsePEMFile(Reader inputReader) throws IOException {
+        PemReader reader = new PemReader(inputReader);
+        PemObject pemObject = reader.readPemObject();
+        byte[] content = pemObject.getContent();
+        reader.close();
+        return content;
+    }
+    private static PublicKey getPublicKey(byte[] keyBytes, String algorithm) {
+        PublicKey publicKey = null;
+        try {
+            KeyFactory kf = KeyFactory.getInstance(algorithm);
+            EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
+            publicKey = kf.generatePublic(keySpec);
+        } catch (NoSuchAlgorithmException e) {
+            System.out.println("Could not reconstruct the public key, the given algorithm could not be found.");
+        } catch (InvalidKeySpecException e) {
+            System.out.println("Could not reconstruct the public key");
+        }
+
+        return publicKey;
+    }
+
+    private static PrivateKey getPrivateKey(byte[] keyBytes, String algorithm) {
+        PrivateKey privateKey = null;
+        try {
+            KeyFactory kf = KeyFactory.getInstance(algorithm);
+            EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(keyBytes);
+            privateKey = kf.generatePrivate(keySpec);
+        } catch (NoSuchAlgorithmException e) {
+            System.out.println("Could not reconstruct the private key, the given algorithm could not be found.");
+        } catch (InvalidKeySpecException e) {
+            System.out.println("Could not reconstruct the private key");
+        }
+
+        return privateKey;
+    }
+
+    public static PublicKey readPublicKeyFromFile(String filepath, String algorithm) throws IOException {
+        byte[] bytes = PemUtils.parsePEMFile(new File(filepath));
+        return PemUtils.getPublicKey(bytes, algorithm);
+    }
+
+    public static PublicKey readPublicKey(String filecontent, String algorithm) throws IOException {
+        byte[] bytes = PemUtils.parsePEMFile(new StringReader(filecontent));
+        return PemUtils.getPublicKey(bytes, algorithm);
+    }
+
+    public static PrivateKey readPrivateKeyFromFile(String filepath, String algorithm) throws IOException {
+        byte[] bytes = PemUtils.parsePEMFile(new File(filepath));
+        return PemUtils.getPrivateKey(bytes, algorithm);
+    }
+
+    public static PrivateKey readPrivateKey(String filecontent, String algorithm) throws IOException {
+        byte[] bytes = PemUtils.parsePEMFile(new StringReader(filecontent));
+        return PemUtils.getPrivateKey(bytes, algorithm);
+    }
+
+}
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