1 files changed, 50 insertions, 0 deletions
diff --git a/certService/src/main/java/org/onap/oom/certservice/certification/conversion/PemStringToCertificateConverter.java b/certService/src/main/java/org/onap/oom/certservice/certification/conversion/PemStringToCertificateConverter.java
new file mode 100644
index 00000000..99499939
--- /dev/null
+++ b/certService/src/main/java/org/onap/oom/certservice/certification/conversion/PemStringToCertificateConverter.java
@@ -0,0 +1,50 @@
+/*
+ * ============LICENSE_START=======================================================
+ * Cert Service
+ * ================================================================================
+ * Copyright (C) 2021 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.io.StringReader;
+import java.security.cert.CertificateException;
+import java.security.cert.X509Certificate;
+import java.util.Optional;
+import org.bouncycastle.cert.X509CertificateHolder;
+import org.bouncycastle.cert.jcajce.JcaX509CertificateConverter;
+import org.bouncycastle.jce.provider.BouncyCastleProvider;
+import org.bouncycastle.openssl.PEMParser;
+import org.onap.oom.certservice.certification.exception.StringToCertificateConversionException;
+import org.springframework.stereotype.Service;
+
+@Service
+public class PemStringToCertificateConverter {
+
+    public X509Certificate convert(String certificatePemString) throws StringToCertificateConversionException {
+        try (PEMParser pemParser = new PEMParser(new StringReader(certificatePemString))) {
+            X509CertificateHolder certHolder = Optional.ofNullable((X509CertificateHolder) pemParser.readObject())
+                .orElseThrow(
+                    () -> new StringToCertificateConversionException("The certificate could not be converted correctly."));
+            return new JcaX509CertificateConverter()
+                .setProvider(new BouncyCastleProvider())
+                .getCertificate(certHolder);
+        } catch (IOException | CertificateException e) {
+            throw new StringToCertificateConversionException("Exception occurred during certificate conversion.", e);
+        }
+    }
+}