1 files changed, 107 insertions, 0 deletions
diff --git a/certService/src/main/java/org/onap/oom/certservice/certification/conversion/OldCertificateModelFactory.java b/certService/src/main/java/org/onap/oom/certservice/certification/conversion/OldCertificateModelFactory.java
new file mode 100644
index 00000000..f5c199f6
--- /dev/null
+++ b/certService/src/main/java/org/onap/oom/certservice/certification/conversion/OldCertificateModelFactory.java
@@ -0,0 +1,107 @@
+/*
+ * ============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.security.KeyFactory;
+import java.security.NoSuchAlgorithmException;
+import java.security.PrivateKey;
+import java.security.cert.CertificateEncodingException;
+import java.security.cert.CertificateParsingException;
+import java.security.cert.X509Certificate;
+import java.security.spec.InvalidKeySpecException;
+import java.security.spec.PKCS8EncodedKeySpec;
+import org.bouncycastle.asn1.x500.X500Name;
+import org.bouncycastle.asn1.x509.Certificate;
+import org.bouncycastle.asn1.x509.GeneralName;
+import org.bouncycastle.cert.jcajce.JcaX509CertificateHolder;
+import org.bouncycastle.util.io.pem.PemObject;
+import org.onap.oom.certservice.certification.X509CertificateParser;
+import org.onap.oom.certservice.certification.exception.CertificateDecryptionException;
+import org.onap.oom.certservice.certification.exception.KeyDecryptionException;
+import org.onap.oom.certservice.certification.exception.StringToCertificateConversionException;
+import org.onap.oom.certservice.certification.model.OldCertificateModel;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+@Service
+public class OldCertificateModelFactory {
+
+    private static final String BEGIN_CERTIFICATE = "-----BEGIN CERTIFICATE-----\n";
+    private static final String END_CERTIFICATE = "-----END CERTIFICATE-----\n";
+    private static final PemObjectFactory PEM_OBJECT_FACTORY = new PemObjectFactory();
+
+    private final PemStringToCertificateConverter pemStringToCertificateConverter;
+    private final X509CertificateParser x509CertificateParser;
+
+    @Autowired
+    public OldCertificateModelFactory(PemStringToCertificateConverter pemStringToCertificateConverter,
+        X509CertificateParser x509CertificateParser) {
+        this.pemStringToCertificateConverter = pemStringToCertificateConverter;
+        this.x509CertificateParser = x509CertificateParser;
+    }
+
+    public OldCertificateModel createCertificateModel(StringBase64 base64EncodedCertificate, String encodedOldPrivateKey)
+        throws CertificateDecryptionException {
+        final String certificateString = base64EncodedCertificate.asString()
+            .map(this::getFirstCertificateFromCertificateChain)
+            .orElseThrow(() -> new CertificateDecryptionException("Incorrect certificate, decryption failed"));
+        try {
+            final X509Certificate x509Certificate = pemStringToCertificateConverter.convert(certificateString);
+            final X500Name subjectData = x509CertificateParser.getSubject(x509Certificate);
+            final GeneralName[] sans = x509CertificateParser.getSans(x509Certificate);
+            final Certificate certificate = new JcaX509CertificateHolder(x509Certificate).toASN1Structure();
+            final PrivateKey oldPrivateKey = getOldPrivateKeyObject(encodedOldPrivateKey);
+            return new OldCertificateModel(certificate, subjectData, sans, oldPrivateKey);
+        } catch (StringToCertificateConversionException e) {
+            throw new CertificateDecryptionException("Cannot convert certificate", e);
+
+        } catch (CertificateParsingException e) {
+            throw new CertificateDecryptionException("Cannot read Subject Alternative Names from certificate");
+        } catch (NoSuchAlgorithmException | KeyDecryptionException | CertificateEncodingException | InvalidKeySpecException e) {
+            throw new CertificateDecryptionException("Cannot convert certificate or key", e);
+        }
+    }
+
+    private String getFirstCertificateFromCertificateChain(String certificateChain) {
+        if (doesNotContainCertificates(certificateChain)) {
+            return null;
+        }
+        return certificateChain.split(END_CERTIFICATE)[0] + END_CERTIFICATE;
+    }
+
+    private boolean doesNotContainCertificates(String certificateChain) {
+        return !(certificateChain.contains(BEGIN_CERTIFICATE) && certificateChain.contains(END_CERTIFICATE));
+    }
+
+    private PrivateKey getOldPrivateKeyObject(String encodedOldPrivateKey)
+        throws KeyDecryptionException, InvalidKeySpecException, NoSuchAlgorithmException {
+
+        StringBase64 stringBase64 = new StringBase64(encodedOldPrivateKey);
+        PemObject pemObject = stringBase64.asString()
+            .flatMap(PEM_OBJECT_FACTORY::createPemObject)
+            .orElseThrow(
+                () -> new KeyDecryptionException("Incorrect Key, decryption failed")
+            );
+        PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(pemObject.getContent());
+        KeyFactory keyFactory = KeyFactory.getInstance("RSA");
+        return keyFactory.generatePrivate(keySpec);
+    }
+}