1 files changed, 46 insertions, 0 deletions
diff --git a/certService/src/main/java/org/onap/oom/certservice/certification/conversion/RsaContentSignerBuilder.java b/certService/src/main/java/org/onap/oom/certservice/certification/conversion/RsaContentSignerBuilder.java
new file mode 100644
index 00000000..d869cef9
--- /dev/null
+++ b/certService/src/main/java/org/onap/oom/certservice/certification/conversion/RsaContentSignerBuilder.java
@@ -0,0 +1,46 @@
+/*
+ * ============LICENSE_START=======================================================
+ * Cert Service
+ * ================================================================================
+ * Copyright (C) 2020 Nokia. 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.oom.certservice.certification.conversion;
+
+import java.io.IOException;
+import java.security.PrivateKey;
+import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
+import org.bouncycastle.crypto.util.PrivateKeyFactory;
+import org.bouncycastle.operator.ContentSigner;
+import org.bouncycastle.operator.DefaultDigestAlgorithmIdentifierFinder;
+import org.bouncycastle.operator.OperatorCreationException;
+import org.bouncycastle.operator.bc.BcRSAContentSignerBuilder;
+import org.bouncycastle.pkcs.PKCS10CertificationRequest;
+import org.springframework.stereotype.Component;
+
+@Component
+public class RsaContentSignerBuilder {
+
+    ContentSigner build(PKCS10CertificationRequest csr, PrivateKey privateKey)
+            throws IOException, OperatorCreationException {
+        AlgorithmIdentifier sigAlgId = csr.getSignatureAlgorithm();
+        AlgorithmIdentifier digAlgId = new DefaultDigestAlgorithmIdentifierFinder().find(sigAlgId);
+
+        return new BcRSAContentSignerBuilder(sigAlgId, digAlgId)
+                       .build(PrivateKeyFactory.createKey(privateKey.getEncoded()));
+    }
+
+}