1 files changed, 66 insertions, 0 deletions
diff --git a/csarvalidation/src/main/java/org/onap/cvc/csar/rsa/X509RsaCertification.java b/csarvalidation/src/main/java/org/onap/cvc/csar/rsa/X509RsaCertification.java
new file mode 100644
index 0000000..8395221
--- /dev/null
+++ b/csarvalidation/src/main/java/org/onap/cvc/csar/rsa/X509RsaCertification.java
@@ -0,0 +1,66 @@
+/*
+ * Copyright 2019 Nokia
+ * <p>
+ * 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
+ * <p>
+ * http://www.apache.org/licenses/LICENSE-2.0
+ * <p>
+ * 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.
+ *
+ */
+
+package org.onap.cvc.csar.rsa;
+
+import org.apache.commons.codec.binary.Base64;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.ByteArrayInputStream;
+import java.io.InputStream;
+import java.nio.charset.StandardCharsets;
+import java.security.InvalidKeyException;
+import java.security.NoSuchAlgorithmException;
+import java.security.PublicKey;
+import java.security.Signature;
+import java.security.SignatureException;
+import java.security.cert.CertificateException;
+import java.security.cert.CertificateFactory;
+import java.security.cert.X509Certificate;
+
+public class X509RsaCertification {
+
+    private static final Logger LOG = LoggerFactory.getLogger(X509RsaCertification.class);
+
+    PublicKey generatePublicKey(String cert) throws CertificateException {
+        byte[] encodedCert = cert.getBytes(StandardCharsets.UTF_8);
+        byte[] decodedCert = Base64.decodeBase64(encodedCert);
+        CertificateFactory certFactory = CertificateFactory.getInstance("X.509");
+        InputStream in = new ByteArrayInputStream(decodedCert);
+        X509Certificate certificate = (X509Certificate) certFactory.generateCertificate(in);
+
+        LOG.info(String.format("Subject DN : %s", certificate.getSubjectDN().getName()));
+        LOG.info(String.format("Issuer : %s", certificate.getIssuerDN().getName()));
+        LOG.info(String.format("Not After: %s", certificate.getNotAfter()));
+        LOG.info(String.format("Not Before: %s", certificate.getNotBefore()));
+        LOG.info(String.format("version: %d", certificate.getVersion()));
+        LOG.info(String.format("serial number : %s", certificate.getSerialNumber()));
+
+        return certificate.getPublicKey();
+    }
+
+    boolean verify(byte[] content, String signature, PublicKey publicKey) throws NoSuchAlgorithmException, InvalidKeyException, SignatureException {
+        Signature publicSignature = Signature.getInstance("SHA256withRSA");
+        publicSignature.initVerify(publicKey);
+        publicSignature.update(content);
+
+        byte[] signatureBytes = java.util.Base64.getDecoder().decode(signature);
+
+        return publicSignature.verify(signatureBytes);
+    }
+}