[OOM-CERT-SERVICE] Add logic for KUR/CR detection

Issue-ID: OOM-2753
Signed-off-by: Remigiusz Janeczek <remigiusz.janeczek@nokia.com>
Change-Id: I571ad3914a870dde83929cb6121c2c63a5df3ae4

10 files changed, 732 insertions, 68 deletions

diff --git a/certService/src/test/java/org/onap/oom/certservice/api/CertificationControllerTest.java b/certService/src/test/java/org/onap/oom/certservice/api/CertificationControllerTest.java
index 0bf37901..f1d5baaf 100644
--- a/certService/src/test/java/org/onap/oom/certservice/api/CertificationControllerTest.java
+++ b/certService/src/test/java/org/onap/oom/certservice/api/CertificationControllerTest.java
@@ -1,6 +1,6 @@
 /*
  * ============LICENSE_START=======================================================
- * PROJECT
+ * Cert Service
  * ================================================================================
  * Copyright (C) 2020-2021 Nokia. All rights reserved.
  * ================================================================================
@@ -32,12 +32,15 @@ import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.ExtendWith;
 import org.mockito.Mock;
 import org.mockito.junit.jupiter.MockitoExtension;
+import org.onap.oom.certservice.certification.exception.CertificateDecryptionException;
+import org.onap.oom.certservice.certification.exception.StringToCertificateConversionException;
 import org.onap.oom.certservice.certification.model.CertificateUpdateModel;
 import org.onap.oom.certservice.certification.CertificationModelFactory;
 import org.onap.oom.certservice.certification.exception.Cmpv2ServerNotFoundException;
 import org.onap.oom.certservice.certification.exception.CsrDecryptionException;
 import org.onap.oom.certservice.certification.exception.DecryptionException;
 import org.onap.oom.certservice.certification.exception.KeyDecryptionException;
+import org.onap.oom.certservice.certification.model.CertificateUpdateModel.CertificateUpdateModelBuilder;
 import org.onap.oom.certservice.certification.model.CertificationModel;
 import org.onap.oom.certservice.cmpv2client.exceptions.CmpClientException;
 import org.springframework.http.HttpStatus;
@@ -54,6 +57,13 @@ class CertificationControllerTest {
     private static final String TEST_WRONG_CA_NAME = "wrongTestCa";
     private static final String TEST_ENCODED_OLD_PK = "encodedOldPK";
     private static final String TEST_ENCODED_OLD_CERT = "encodedOldCert";
+    private static final CertificateUpdateModel TEST_CERTIFICATE_UPDATE_MODEL = new CertificateUpdateModelBuilder()
+        .setEncodedCsr(TEST_ENCODED_CSR)
+        .setEncodedPrivateKey(TEST_ENCODED_PK)
+        .setEncodedOldCert(TEST_ENCODED_OLD_CERT)
+        .setEncodedOldPrivateKey(TEST_ENCODED_OLD_PK)
+        .setCaName(TEST_CA_NAME)
+        .build();
 
     private CertificationController certificationController;
 
@@ -148,20 +158,14 @@ class CertificationControllerTest {
     }
 
     @Test
-    void shouldUpdateEndpointReturnDataAboutCsrBaseOnEncodedParameters() {
+    void shouldUpdateEndpointReturnDataAboutCsrBaseOnEncodedParameters()
+        throws DecryptionException, CertificateDecryptionException {
         // Given
         CertificationModel testCertificationModel = new CertificationModel(
                 Arrays.asList("ENTITY_CERT", "INTERMEDIATE_CERT"),
                 Arrays.asList("CA_CERT", "EXTRA_CA_CERT")
         );
-        CertificateUpdateModel certificateUpdateModel = new CertificateUpdateModel.CertificateUpdateModelBuilder()
-                .setEncodedCsr(TEST_ENCODED_CSR)
-                .setEncodedPrivateKey(TEST_ENCODED_PK)
-                .setEncodedOldCert(TEST_ENCODED_OLD_CERT)
-                .setEncodedOldPrivateKey(TEST_ENCODED_OLD_PK)
-                .setCaName(TEST_CA_NAME)
-                .build();
-        when(certificationModelFactory.createCertificationModel(certificateUpdateModel)).thenReturn(testCertificationModel);
+        when(certificationModelFactory.createCertificationModel(TEST_CERTIFICATE_UPDATE_MODEL)).thenReturn(testCertificationModel);
 
         // When
         ResponseEntity<CertificationModel> responseCertificationModel =
@@ -173,4 +177,25 @@ class CertificationControllerTest {
         assertThat(responseCertificationModel.getBody()).isEqualToComparingFieldByField(testCertificationModel);
     }
 
+    @Test
+    void shouldThrowCertificateDecryptionExceptionWhenCreatingPemModelFails()
+        throws DecryptionException, CertificateDecryptionException {
+        // Given
+        String expectedMessage = "Incorrect certificate, decryption failed";
+        when(certificationModelFactory.createCertificationModel(TEST_CERTIFICATE_UPDATE_MODEL))
+            .thenThrow(new CertificateDecryptionException(expectedMessage));
+
+        // When
+        Exception exception = assertThrows(
+            CertificateDecryptionException.class, () ->
+                certificationController.updateCertificate(TEST_CA_NAME, TEST_ENCODED_CSR,
+                    TEST_ENCODED_PK, TEST_ENCODED_OLD_CERT, TEST_ENCODED_OLD_PK)
+        );
+
+        String actualMessage = exception.getMessage();
+
+        // Then
+        assertEquals(expectedMessage, actualMessage);
+    }
+
 }
diff --git a/certService/src/test/java/org/onap/oom/certservice/certification/CertificationModelFactoryTest.java b/certService/src/test/java/org/onap/oom/certservice/certification/CertificationModelFactoryTest.java
index 705ae004..c898b687 100644
--- a/certService/src/test/java/org/onap/oom/certservice/certification/CertificationModelFactoryTest.java
+++ b/certService/src/test/java/org/onap/oom/certservice/certification/CertificationModelFactoryTest.java
@@ -1,6 +1,6 @@
 /*
  * ============LICENSE_START=======================================================
- * PROJECT
+ * Cert Service
  * ================================================================================
  * Copyright (C) 2020-2021 Nokia. All rights reserved.
  * ================================================================================
@@ -20,6 +20,25 @@
 
 package org.onap.oom.certservice.certification;
 
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.when;
+import static org.onap.oom.certservice.certification.CertificationData.CA_CERT;
+import static org.onap.oom.certservice.certification.CertificationData.ENTITY_CERT;
+import static org.onap.oom.certservice.certification.CertificationData.EXTRA_CA_CERT;
+import static org.onap.oom.certservice.certification.CertificationData.INTERMEDIATE_CERT;
+import static org.onap.oom.certservice.certification.TestData.TEST_CSR;
+import static org.onap.oom.certservice.certification.TestData.TEST_PK;
+import static org.onap.oom.certservice.certification.TestData.TEST_WRONG_CSR;
+import static org.onap.oom.certservice.certification.TestData.TEST_WRONG_PEM;
+
+import java.util.Arrays;
+import java.util.Base64;
+import java.util.List;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.ExtendWith;
@@ -27,33 +46,18 @@ import org.mockito.Mock;
 import org.mockito.junit.jupiter.MockitoExtension;
 import org.onap.oom.certservice.certification.configuration.Cmpv2ServerProvider;
 import org.onap.oom.certservice.certification.configuration.model.Cmpv2Server;
+import org.onap.oom.certservice.certification.exception.CertificateDecryptionException;
 import org.onap.oom.certservice.certification.exception.Cmpv2ClientAdapterException;
 import org.onap.oom.certservice.certification.exception.Cmpv2ServerNotFoundException;
 import org.onap.oom.certservice.certification.exception.CsrDecryptionException;
 import org.onap.oom.certservice.certification.exception.DecryptionException;
+import org.onap.oom.certservice.certification.model.CertificateUpdateModel;
+import org.onap.oom.certservice.certification.model.CertificateUpdateModel.CertificateUpdateModelBuilder;
 import org.onap.oom.certservice.certification.model.CertificationModel;
 import org.onap.oom.certservice.certification.model.CsrModel;
+import org.onap.oom.certservice.certification.model.X509CertificateModel;
 import org.onap.oom.certservice.cmpv2client.exceptions.CmpClientException;
 
-import java.util.Arrays;
-import java.util.Base64;
-import java.util.List;
-
-import static org.assertj.core.api.Assertions.assertThat;
-import static org.junit.jupiter.api.Assertions.assertEquals;
-import static org.junit.jupiter.api.Assertions.assertThrows;
-import static org.junit.jupiter.api.Assertions.assertTrue;
-import static org.mockito.Mockito.mock;
-import static org.mockito.Mockito.when;
-import static org.onap.oom.certservice.certification.CertificationData.CA_CERT;
-import static org.onap.oom.certservice.certification.CertificationData.ENTITY_CERT;
-import static org.onap.oom.certservice.certification.CertificationData.INTERMEDIATE_CERT;
-import static org.onap.oom.certservice.certification.CertificationData.EXTRA_CA_CERT;
-import static org.onap.oom.certservice.certification.TestData.TEST_CSR;
-import static org.onap.oom.certservice.certification.TestData.TEST_PK;
-import static org.onap.oom.certservice.certification.TestData.TEST_WRONG_CSR;
-import static org.onap.oom.certservice.certification.TestData.TEST_WRONG_PEM;
-
 @ExtendWith(MockitoExtension.class)
 class CertificationModelFactoryTest {
 
@@ -62,6 +66,18 @@ class CertificationModelFactoryTest {
     private static final String ENCODED_PK = getEncodedString(TEST_PK);
     private static final String ENCODED_WRONG_CSR = getEncodedString(TEST_WRONG_CSR);
     private static final String ENCODED_WRONG_PK = getEncodedString(TEST_WRONG_PEM);
+    private static final String TEST_CA_NAME = "TestCa";
+    private static final String TEST_ENCODED_CSR = "encodedCSR";
+    private static final String TEST_ENCODED_PK = "encodedPK";
+    private static final String TEST_ENCODED_OLD_PK = "encodedOldPK";
+    private static final String TEST_ENCODED_OLD_CERT = "encodedOldCert";
+    private static final CertificateUpdateModel TEST_CERTIFICATE_UPDATE_MODEL = new CertificateUpdateModelBuilder()
+        .setEncodedCsr(TEST_ENCODED_CSR)
+        .setEncodedPrivateKey(TEST_ENCODED_PK)
+        .setEncodedOldCert(TEST_ENCODED_OLD_CERT)
+        .setEncodedOldPrivateKey(TEST_ENCODED_OLD_PK)
+        .setCaName(TEST_CA_NAME)
+        .build();
 
     private CertificationModelFactory certificationModelFactory;
 
@@ -71,7 +87,10 @@ class CertificationModelFactoryTest {
     private CsrModelFactory csrModelFactory;
     @Mock
     private CertificationProvider certificationProvider;
-
+    @Mock
+    private X509CertificateModelFactory x509CertificateModelFactory;
+    @Mock
+    private UpdateRequestTypeDetector updateRequestTypeDetector;
 
     private static String getEncodedString(String testCsr) {
         return Base64.getEncoder().encodeToString(testCsr.getBytes());
@@ -80,12 +99,13 @@ class CertificationModelFactoryTest {
     @BeforeEach
     void setUp() {
         certificationModelFactory =
-                new CertificationModelFactory(csrModelFactory, cmpv2ServerProvider, certificationProvider);
+            new CertificationModelFactory(csrModelFactory, cmpv2ServerProvider, certificationProvider,
+                x509CertificateModelFactory, updateRequestTypeDetector);
     }
 
     @Test
     void shouldCreateProperCertificationModelWhenGivenProperCsrModelAndCaName()
-            throws CmpClientException, DecryptionException, Cmpv2ClientAdapterException {
+        throws CmpClientException, DecryptionException, Cmpv2ClientAdapterException {
 
         // Given
         CsrModel csrModel = mockCsrFactoryModelCreation();
@@ -94,7 +114,7 @@ class CertificationModelFactoryTest {
 
         // When
         CertificationModel certificationModel =
-                certificationModelFactory.createCertificationModel(ENCODED_CSR, ENCODED_PK, TEST_CA);
+            certificationModelFactory.createCertificationModel(ENCODED_CSR, ENCODED_PK, TEST_CA);
 
         // Then
         assertEquals(2, certificationModel.getCertificateChain().size());
@@ -105,22 +125,22 @@ class CertificationModelFactoryTest {
 
     @Test
     void shouldThrowDecryptionExceptionWhenGivenWrongEncodedCsr()
-            throws DecryptionException {
+        throws DecryptionException {
         // Given
         String expectedMessage = "Incorrect CSR, decryption failed";
         when(
-                csrModelFactory.createCsrModel(
-                        new CsrModelFactory.StringBase64(ENCODED_WRONG_CSR),
-                        new CsrModelFactory.StringBase64(ENCODED_WRONG_PK)
-                )
+            csrModelFactory.createCsrModel(
+                new StringBase64(ENCODED_WRONG_CSR),
+                new StringBase64(ENCODED_WRONG_PK)
+            )
         ).thenThrow(
-                new CsrDecryptionException(expectedMessage)
+            new CsrDecryptionException(expectedMessage)
         );
 
         // When
         Exception exception = assertThrows(
-                DecryptionException.class, () ->
-                        certificationModelFactory.createCertificationModel(ENCODED_WRONG_CSR, ENCODED_WRONG_PK, TEST_CA)
+            DecryptionException.class, () ->
+                certificationModelFactory.createCertificationModel(ENCODED_WRONG_CSR, ENCODED_WRONG_PK, TEST_CA)
         );
 
         // Then
@@ -129,20 +149,20 @@ class CertificationModelFactoryTest {
 
     @Test
     void shouldThrowCmpv2ServerNotFoundExceptionWhenGivenWrongCaName()
-            throws DecryptionException {
+        throws DecryptionException {
         // Given
         String expectedMessage = "CA not found";
         mockCsrFactoryModelCreation();
         when(
-                cmpv2ServerProvider.getCmpv2Server(TEST_CA)
+            cmpv2ServerProvider.getCmpv2Server(TEST_CA)
         ).thenThrow(
-                new Cmpv2ServerNotFoundException(expectedMessage)
+            new Cmpv2ServerNotFoundException(expectedMessage)
         );
 
         // When
         Exception exception = assertThrows(
-                Cmpv2ServerNotFoundException.class, () ->
-                        certificationModelFactory.createCertificationModel(ENCODED_CSR, ENCODED_PK, TEST_CA)
+            Cmpv2ServerNotFoundException.class, () ->
+                certificationModelFactory.createCertificationModel(ENCODED_CSR, ENCODED_PK, TEST_CA)
         );
 
         // Then
@@ -151,56 +171,98 @@ class CertificationModelFactoryTest {
 
     @Test
     void shouldThrowCmpClientExceptionWhenSigningCsrFailed()
-            throws DecryptionException, CmpClientException, Cmpv2ClientAdapterException {
+        throws DecryptionException, CmpClientException, Cmpv2ClientAdapterException {
         // Given
         String expectedMessage = "failed to sign certificate";
         CsrModel csrModel = mockCsrFactoryModelCreation();
         Cmpv2Server testServer = mockCmpv2ProviderServerSelection();
         when(
-                certificationProvider.signCsr(csrModel, testServer)
+            certificationProvider.signCsr(csrModel, testServer)
         ).thenThrow(
-                new CmpClientException(expectedMessage)
+            new CmpClientException(expectedMessage)
         );
 
         // When
         Exception exception = assertThrows(
-                CmpClientException.class, () ->
-                        certificationModelFactory.createCertificationModel(ENCODED_CSR, ENCODED_PK, TEST_CA)
+            CmpClientException.class, () ->
+                certificationModelFactory.createCertificationModel(ENCODED_CSR, ENCODED_PK, TEST_CA)
         );
 
         // Then
         assertTrue(exception.getMessage().contains(expectedMessage));
     }
 
+    @Test
+    void shouldPerformKurWhenCsrAndOldCertDataMatch() throws CertificateDecryptionException, DecryptionException {
+        //given
+        mockCsrFactoryModelCreation();
+        mockCertificateFactoryModelCreation();
+        when(updateRequestTypeDetector.isKur(any(), any())).thenReturn(true);
+        //when, then
+        Exception exception = assertThrows(
+            UnsupportedOperationException.class, () ->
+                certificationModelFactory.createCertificationModel(TEST_CERTIFICATE_UPDATE_MODEL)
+        );
+        assertEquals(exception.getMessage(), "TODO: implement KUR in separate MR");
+    }
+
+    @Test
+    void shouldPerformCrWhenCsrAndOldCertDataMatch() throws CertificateDecryptionException, DecryptionException {
+        //given
+        mockCsrFactoryModelCreation();
+        mockCertificateFactoryModelCreation();
+        when(updateRequestTypeDetector.isKur(any(), any())).thenReturn(false);
+        //when, then
+        Exception exception = assertThrows(
+            UnsupportedOperationException.class, () ->
+                certificationModelFactory.createCertificationModel(TEST_CERTIFICATE_UPDATE_MODEL)
+        );
+        assertEquals(exception.getMessage(), "TODO: implement CR in separate MR");
+    }
+
+    @Test
+    void shouldThrowCertificateDecryptionExceptionWhenOldCertificateInvalid()
+        throws CertificateDecryptionException {
+        //given
+        when(x509CertificateModelFactory.createCertificateModel(any()))
+            .thenThrow(new CertificateDecryptionException("Incorrect certificate, decryption failed"));
+        //when, then
+        assertThrows(
+            CertificateDecryptionException.class, () ->
+                certificationModelFactory.createCertificationModel(TEST_CERTIFICATE_UPDATE_MODEL)
+        );
+    }
 
     private void mockCertificateProviderCertificateSigning(CsrModel csrModel, Cmpv2Server testServer)
-            throws CmpClientException, Cmpv2ClientAdapterException {
+        throws CmpClientException, Cmpv2ClientAdapterException {
         CertificationModel expectedCertificationModel = getCertificationModel();
         when(
-                certificationProvider.signCsr(csrModel, testServer)
+            certificationProvider.signCsr(csrModel, testServer)
         ).thenReturn(expectedCertificationModel);
     }
 
     private Cmpv2Server mockCmpv2ProviderServerSelection() {
         Cmpv2Server testServer = getCmpv2Server();
         when(
-                cmpv2ServerProvider.getCmpv2Server(TEST_CA)
+            cmpv2ServerProvider.getCmpv2Server(TEST_CA)
         ).thenReturn(testServer);
         return testServer;
     }
 
     private CsrModel mockCsrFactoryModelCreation()
-            throws DecryptionException {
+        throws DecryptionException {
         CsrModel csrModel = getCsrModel();
-        when(
-                csrModelFactory.createCsrModel(
-                        new CsrModelFactory.StringBase64(ENCODED_CSR),
-                        new CsrModelFactory.StringBase64(ENCODED_PK)
-                )
-        ).thenReturn(csrModel);
+        when(csrModelFactory.createCsrModel(any(), any())).thenReturn(csrModel);
         return csrModel;
     }
 
+    private X509CertificateModel mockCertificateFactoryModelCreation()
+        throws CertificateDecryptionException {
+        final X509CertificateModel certificateModel = mock(X509CertificateModel.class);
+        when(x509CertificateModelFactory.createCertificateModel(any())).thenReturn(certificateModel);
+        return certificateModel;
+    }
+
     private Cmpv2Server getCmpv2Server() {
         return new Cmpv2Server();
     }
diff --git a/certService/src/test/java/org/onap/oom/certservice/certification/CsrModelFactoryTest.java b/certService/src/test/java/org/onap/oom/certservice/certification/CsrModelFactoryTest.java
index 88cc6fb8..eb6a0550 100644
--- a/certService/src/test/java/org/onap/oom/certservice/certification/CsrModelFactoryTest.java
+++ b/certService/src/test/java/org/onap/oom/certservice/certification/CsrModelFactoryTest.java
@@ -1,6 +1,6 @@
 /*
  * ============LICENSE_START=======================================================
- * PROJECT
+ * Cert Service
  * ================================================================================
  * Copyright (C) 2020 Nokia. All rights reserved.
  * ================================================================================
@@ -23,7 +23,6 @@ package org.onap.oom.certservice.certification;
 import org.bouncycastle.util.encoders.Base64;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
-import org.onap.oom.certservice.certification.CsrModelFactory.StringBase64;
 import org.onap.oom.certservice.certification.exception.CsrDecryptionException;
 import org.onap.oom.certservice.certification.exception.DecryptionException;
 import org.onap.oom.certservice.certification.exception.KeyDecryptionException;
@@ -58,6 +57,7 @@ class CsrModelFactoryTest {
 
         assertTrue(decryptedCsr.toString()
             .contains(TestData.EXPECTED_CERT_SUBJECT));
+        System.out.println(decryptedCsr.toString());
         assertTrue(decryptedCsr.toString()
             .contains(TestData.EXPECTED_CERT_SANS));
     }
diff --git a/certService/src/test/java/org/onap/oom/certservice/certification/PemStringToCertificateConverterTest.java b/certService/src/test/java/org/onap/oom/certservice/certification/PemStringToCertificateConverterTest.java
new file mode 100644
index 00000000..ecdb1a2e
--- /dev/null
+++ b/certService/src/test/java/org/onap/oom/certservice/certification/PemStringToCertificateConverterTest.java
@@ -0,0 +1,90 @@
+/*
+ * ============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;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+
+import java.io.Serializable;
+import java.security.cert.CertificateParsingException;
+import java.security.cert.X509Certificate;
+import java.util.List;
+import org.bouncycastle.asn1.x509.GeneralName;
+import org.junit.jupiter.api.Test;
+import org.onap.oom.certservice.certification.exception.StringToCertificateConversionException;
+
+class PemStringToCertificateConverterTest {
+
+    private static final String CERTIFICATE_PEM_STRING =
+        "-----BEGIN CERTIFICATE-----\n"
+            + "MIIEizCCAvOgAwIBAgIUGEp2GZ6Y8nzDA9CKl5nURI7CUN8wDQYJKoZIhvcNAQEL\n"
+            + "BQAwYTEjMCEGCgmSJomT8ixkAQEME2MtMGpiZnE4cWExZm8wd2ttbnkxFTATBgNV\n"
+            + "BAMMDE1hbmFnZW1lbnRDQTEjMCEGA1UECgwaRUpCQ0EgQ29udGFpbmVyIFF1aWNr\n"
+            + "c3RhcnQwHhcNMjEwNjI5MDY1MDI1WhcNMjMwNjI5MDY1MDI0WjB3MREwDwYDVQQD\n"
+            + "DAhvbmFwLm9yZzEZMBcGA1UECwwQTGludXgtRm91bmRhdGlvbjENMAsGA1UECgwE\n"
+            + "T05BUDEWMBQGA1UEBwwNU2FuLUZyYW5jaXNjbzETMBEGA1UECAwKQ2FsaWZvcm5p\n"
+            + "YTELMAkGA1UEBhMCVVMwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQDB\n"
+            + "zvbyrrEiaoBj8kma2QmC+VLmmtWFWyAJgSrYA4kxuyrjQCW4JyFGvmzbYoUFFLOF\n"
+            + "hfq18VjTs0cbTysX8cFSfkV2EKGERBaZnZRQso6SIJNGa3xMe5FHjREy34Np04IH\n"
+            + "jSQ42eIBgcNiIada4jgEnIQQYQJSPQtHkfOMC6O+3RpT/eHtvo5urR16MFY1K6so\n"
+            + "nWYitI5TpEKRozav6zqU/otHgn5jRLryj0IZy0ijlBfSKTxrFfZr3KoMDudVEfUM\n"
+            + "tsqER3poc1gFkqmCRK38BPNiY7v5KATRB+fWN+P75mw43drx9rImp+JtpOUsDK8r\n"
+            + "IBd8o4afNvr/WrygBB8rAgMBAAGjgaQwgaEwDAYDVR0TAQH/BAIwADAfBgNVHSME\n"
+            + "GDAWgBR9M1qUnQM0CpHUz34F5sVUUcIDtjAYBgNVHREEETAPgg10ZXN0Lm9uYXAu\n"
+            + "b3JnMCcGA1UdJQQgMB4GCCsGAQUFBwMCBggrBgEFBQcDBAYIKwYBBQUHAwEwHQYD\n"
+            + "VR0OBBYEFAfqcU6xGi8jzjlRuKQBtqRcXi+uMA4GA1UdDwEB/wQEAwIF4DANBgkq\n"
+            + "hkiG9w0BAQsFAAOCAYEAAdw77q7shKtS8lDGcJ/Y8dEjjNSlRtU14EMC59kmKeft\n"
+            + "Ri7d0oCQXtdRCut3ymizLVqQkmX6SrGshpWUsNzTdITjQ6JB2KOaiIWIF60NSleW\n"
+            + "0vLm36EmY1ErK+zKe7tvGWZhTNVzBXtnq+AMfJc41u2uelkx0LNczsX9aCajLH1v\n"
+            + "4z4XsUnm9qiXpnEm632emuJyj6Nt0JWVuNTJTPRnqVZf6KKR83v8JuV0EefWd5WV\n"
+            + "cFspL0H3MKJV7uf7hfllnIcRtzXa5pctBCboFShVkRNaAMPpJf0DBLQxm7dAWj5A\n"
+            + "hG1rwmTmzM6NpwGHW/I1SFMmtQiF0PACz1Un6nDW/Rf1iHEoGf8YBLP332LJSDug\n"
+            + "RKn0cM3QTcyUEzCZxSwKJ2ngC9eG9C2d3YhB6Zxtl+gUIa3AwwPbqr7YR9QkD2Eo\n"
+            + "d4LqEH9znyBfi7k2YCwP6rtfSi6ClybXe8eBcuMES4TAQfFK6FVf58tGQIx06I0O\n"
+            + "34nemZwkLoOBzZkepaQv\n"
+            + "-----END CERTIFICATE-----\n";
+
+    private static final List<? extends Serializable> EXPECTED_SUBJECT_ALTERNATIVE_NAME = List
+        .of(GeneralName.dNSName, "test.onap.org");
+
+    private static final String EXPECTED_SUBJECT = "CN=onap.org,OU=Linux-Foundation,O=ONAP,L=San-Francisco,ST=California,C=US";
+
+    private final PemStringToCertificateConverter converter = new PemStringToCertificateConverter();
+
+    @Test
+    void shouldConvertStringToCertificate() throws CertificateParsingException, StringToCertificateConversionException {
+        //given, when
+        X509Certificate certificate = converter.convert(CERTIFICATE_PEM_STRING);
+        //then
+        assertThat(certificate).isNotNull();
+        assertThat(certificate.getSubjectDN())
+            .hasToString(EXPECTED_SUBJECT);
+        assertThat(certificate.getSubjectAlternativeNames())
+            .containsExactly(EXPECTED_SUBJECT_ALTERNATIVE_NAME);
+    }
+
+    @Test
+    void shouldThrowExceptionWhenCertificateStringInvalid() {
+        assertThatThrownBy(() -> converter.convert(""))
+            .isInstanceOf(StringToCertificateConversionException.class);
+    }
+
+}
diff --git a/certService/src/test/java/org/onap/oom/certservice/certification/TestData.java b/certService/src/test/java/org/onap/oom/certservice/certification/TestData.java
index 1c883f8e..92b239f1 100644
--- a/certService/src/test/java/org/onap/oom/certservice/certification/TestData.java
+++ b/certService/src/test/java/org/onap/oom/certservice/certification/TestData.java
@@ -2,7 +2,7 @@
  * ============LICENSE_START=======================================================
  * PROJECT
  * ================================================================================
- * Copyright (C) 2020 Nokia. All rights reserved.
+ * Copyright (C) 2020-2021 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.
@@ -29,7 +29,7 @@ public final class TestData {
 
     public static final String EXPECTED_CERT_SUBJECT = "C=US,ST=California,L=San-Francisco,O=Linux-Foundation,OU=ONAP,CN=onap.org";
     public static final String EXPECTED_CERT_SANS =
-        "SANs: [localhost, onap.org, test.onap.org, onap@onap.org, " + LOCALHOST_IP_IN_HEX + ", onap://cluster.local/]";
+        "SANs: [onap@onap.org, localhost, onap.org, test.onap.org, onap://cluster.local/, " + LOCALHOST_IP_IN_HEX +"]";
 
 
     public static final String TEST_CSR = "-----BEGIN CERTIFICATE REQUEST-----\n"
diff --git a/certService/src/test/java/org/onap/oom/certservice/certification/TestUtils.java b/certService/src/test/java/org/onap/oom/certservice/certification/TestUtils.java
index 7c69bd52..0dceda19 100644
--- a/certService/src/test/java/org/onap/oom/certservice/certification/TestUtils.java
+++ b/certService/src/test/java/org/onap/oom/certservice/certification/TestUtils.java
@@ -1,6 +1,6 @@
 /*
  * ============LICENSE_START=======================================================
- * PROJECT
+ * Cert Service
  * ================================================================================
  * Copyright (C) 2020 Nokia. All rights reserved.
  * ================================================================================
@@ -56,6 +56,6 @@ public final class TestUtils {
         String encoderCsr = new String(Base64.encode(TEST_CSR.getBytes()));
         String encoderPK = new String(Base64.encode(TEST_PK.getBytes()));
         return csrModelFactory
-                .createCsrModel(new CsrModelFactory.StringBase64(encoderCsr), new CsrModelFactory.StringBase64(encoderPK));
+                .createCsrModel(new StringBase64(encoderCsr), new StringBase64(encoderPK));
     }
 }
diff --git a/certService/src/test/java/org/onap/oom/certservice/certification/UpdateRequestTypeDetectorTest.java b/certService/src/test/java/org/onap/oom/certservice/certification/UpdateRequestTypeDetectorTest.java
new file mode 100644
index 00000000..ee078534
--- /dev/null
+++ b/certService/src/test/java/org/onap/oom/certservice/certification/UpdateRequestTypeDetectorTest.java
@@ -0,0 +1,120 @@
+/*
+ * ============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;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import java.util.stream.Stream;
+import org.bouncycastle.asn1.x500.X500Name;
+import org.bouncycastle.asn1.x509.GeneralName;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.MethodSource;
+import org.onap.oom.certservice.certification.model.CertificateData;
+
+class UpdateRequestTypeDetectorTest {
+
+    private static final String SUBJECT = "CN=onap.org,OU=Linux-Foundation,O=ONAP,L=San-Francisco,ST=California,C=US";
+    private static final String SUBJECT_CHANGED_ORDER = "ST=California,C=US,OU=Linux-Foundation,CN=onap.org,O=ONAP,L=San-Francisco";
+    private static final String OTHER_SUBJECT = "CN=onap1.org,OU=Linux-Foundation,O=ONAP,L=San-Francisco,ST=California,C=US";
+    private static final String DNS_NAME = "test.onap.org";
+    private static final String OTHER_DNS_NAME = "test1.onap.org";
+
+    private final UpdateRequestTypeDetector updateRequestTypeDetector = new UpdateRequestTypeDetector();
+
+    private static Stream<Arguments> equalSubjectParameters() {
+        return Stream.of(
+            Arguments.of(SUBJECT, SUBJECT),
+            Arguments.of(SUBJECT_CHANGED_ORDER, SUBJECT_CHANGED_ORDER),
+            Arguments.of(SUBJECT, SUBJECT_CHANGED_ORDER),
+            Arguments.of(SUBJECT_CHANGED_ORDER, SUBJECT)
+        );
+    }
+
+    private static Stream<Arguments> notEqualSubjectParameters() {
+        return Stream.of(
+            Arguments.of(SUBJECT, OTHER_SUBJECT),
+            Arguments.of(OTHER_SUBJECT, SUBJECT),
+            Arguments.of(SUBJECT_CHANGED_ORDER, OTHER_SUBJECT),
+            Arguments.of(OTHER_SUBJECT, SUBJECT_CHANGED_ORDER)
+        );
+    }
+
+    @ParameterizedTest
+    @MethodSource("equalSubjectParameters")
+    void shouldBeKurWhenSameSubjectData(String subject1, String subject2) {
+        //given
+        final CertificateData certificateData1 = new CertificateData(new X500Name(subject1), null);
+        final CertificateData certificateData2 = new CertificateData(new X500Name(subject2), null);
+        //when, then
+        assertThat(updateRequestTypeDetector.isKur(certificateData1, certificateData2)).isTrue();
+    }
+
+    @ParameterizedTest
+    @MethodSource("notEqualSubjectParameters")
+    void shouldNotBeKurDifferentSubjectData(String subject1, String subject2) {
+        //given
+        final CertificateData certificateData1 = new CertificateData(new X500Name(subject1), null);
+        final CertificateData certificateData2 = new CertificateData(new X500Name(subject2), null);
+        //when, then
+        assertThat(updateRequestTypeDetector.isKur(certificateData1, certificateData2)).isFalse();
+    }
+
+    @Test
+    void shouldBeKurWhenEqualSans() {
+        //given
+        final GeneralName[] sans1 = new GeneralName[]{new GeneralName(GeneralName.dNSName, DNS_NAME)};
+        final GeneralName[] sans2 = new GeneralName[]{new GeneralName(GeneralName.dNSName, DNS_NAME)};
+        final CertificateData certificateData1 = new CertificateData(new X500Name(SUBJECT), sans1);
+        final CertificateData certificateData2 = new CertificateData(new X500Name(SUBJECT), sans2);
+        //when, then
+        assertThat(updateRequestTypeDetector.isKur(certificateData1, certificateData2)).isTrue();
+    }
+
+    @Test
+    void shouldNotBeKurWhenNotEqualSans() {
+        //given
+        final GeneralName[] sans1 = new GeneralName[]{new GeneralName(GeneralName.dNSName, DNS_NAME)};
+        final GeneralName[] sans2 = new GeneralName[]{new GeneralName(GeneralName.dNSName, OTHER_DNS_NAME)};
+        final CertificateData certificateData1 = new CertificateData(new X500Name(SUBJECT), sans1);
+        final CertificateData certificateData2 = new CertificateData(new X500Name(SUBJECT), sans2);
+        //when, then
+        assertThat(updateRequestTypeDetector.isKur(certificateData1, certificateData2)).isFalse();
+    }
+
+    @Test
+    void shouldBeKurWhenEqualSansIgnoringOrder() {
+        //given
+        GeneralName[] sans1 = new GeneralName[]{
+            new GeneralName(GeneralName.dNSName, DNS_NAME),
+            new GeneralName(GeneralName.dNSName, OTHER_DNS_NAME)
+        };
+        GeneralName[] sans2 = new GeneralName[]{
+            new GeneralName(GeneralName.dNSName, OTHER_DNS_NAME),
+            new GeneralName(GeneralName.dNSName, DNS_NAME)
+        };
+        final CertificateData certificateData1 = new CertificateData(new X500Name(SUBJECT), sans1);
+        final CertificateData certificateData2 = new CertificateData(new X500Name(SUBJECT), sans2);
+        //when, then
+        assertThat(updateRequestTypeDetector.isKur(certificateData1, certificateData2)).isTrue();
+    }
+}
diff --git a/certService/src/test/java/org/onap/oom/certservice/certification/X509CertificateModelFactoryTest.java b/certService/src/test/java/org/onap/oom/certservice/certification/X509CertificateModelFactoryTest.java
new file mode 100644
index 00000000..bad4887b
--- /dev/null
+++ b/certService/src/test/java/org/onap/oom/certservice/certification/X509CertificateModelFactoryTest.java
@@ -0,0 +1,166 @@
+/*
+ * ============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;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+
+import org.bouncycastle.asn1.x500.X500Name;
+import org.bouncycastle.asn1.x509.GeneralName;
+import org.junit.jupiter.api.Test;
+import org.onap.oom.certservice.certification.exception.CertificateDecryptionException;
+import org.onap.oom.certservice.certification.model.X509CertificateModel;
+
+class X509CertificateModelFactoryTest {
+
+    private static final String ENCODED_CERTIFICATE_STRING =
+        "LS0tLS1CRUdJTiBDRVJUSUZJQ0FURS0tLS0tCk1JSUVpekNDQXZPZ0F3SUJBZ0lVR0VwMkdaNlk4"
+            + "bnpEQTlDS2w1blVSSTdDVU44d0RRWUpLb1pJaHZjTkFRRUwKQlFBd1lURWpNQ0VHQ2dtU0pvbVQ4"
+            + "aXhrQVFFTUUyTXRNR3BpWm5FNGNXRXhabTh3ZDJ0dGJua3hGVEFUQmdOVgpCQU1NREUxaGJtRm5a"
+            + "VzFsYm5SRFFURWpNQ0VHQTFVRUNnd2FSVXBDUTBFZ1EyOXVkR0ZwYm1WeUlGRjFhV05yCmMzUmhj"
+            + "blF3SGhjTk1qRXdOakk1TURZMU1ESTFXaGNOTWpNd05qSTVNRFkxTURJMFdqQjNNUkV3RHdZRFZR"
+            + "UUQKREFodmJtRndMbTl5WnpFWk1CY0dBMVVFQ3d3UVRHbHVkWGd0Um05MWJtUmhkR2x2YmpFTk1B"
+            + "c0dBMVVFQ2d3RQpUMDVCVURFV01CUUdBMVVFQnd3TlUyRnVMVVp5WVc1amFYTmpiekVUTUJFR0Ex"
+            + "VUVDQXdLUTJGc2FXWnZjbTVwCllURUxNQWtHQTFVRUJoTUNWVk13Z2dFaU1BMEdDU3FHU0liM0RR"
+            + "RUJBUVVBQTRJQkR3QXdnZ0VLQW9JQkFRREIKenZieXJyRWlhb0JqOGttYTJRbUMrVkxtbXRXRld5"
+            + "QUpnU3JZQTRreHV5cmpRQ1c0SnlGR3ZtemJZb1VGRkxPRgpoZnExOFZqVHMwY2JUeXNYOGNGU2Zr"
+            + "VjJFS0dFUkJhWm5aUlFzbzZTSUpOR2EzeE1lNUZIalJFeTM0TnAwNElICmpTUTQyZUlCZ2NOaUlh"
+            + "ZGE0amdFbklRUVlRSlNQUXRIa2ZPTUM2TyszUnBUL2VIdHZvNXVyUjE2TUZZMUs2c28KbldZaXRJ"
+            + "NVRwRUtSb3phdjZ6cVUvb3RIZ241alJMcnlqMElaeTBpamxCZlNLVHhyRmZacjNLb01EdWRWRWZV"
+            + "TQp0c3FFUjNwb2MxZ0ZrcW1DUkszOEJQTmlZN3Y1S0FUUkIrZldOK1A3NW13NDNkcng5ckltcCtK"
+            + "dHBPVXNESzhyCklCZDhvNGFmTnZyL1dyeWdCQjhyQWdNQkFBR2pnYVF3Z2FFd0RBWURWUjBUQVFI"
+            + "L0JBSXdBREFmQmdOVkhTTUUKR0RBV2dCUjlNMXFVblFNMENwSFV6MzRGNXNWVVVjSUR0akFZQmdO"
+            + "VkhSRUVFVEFQZ2cxMFpYTjBMbTl1WVhBdQpiM0puTUNjR0ExVWRKUVFnTUI0R0NDc0dBUVVGQndN"
+            + "Q0JnZ3JCZ0VGQlFjREJBWUlLd1lCQlFVSEF3RXdIUVlEClZSME9CQllFRkFmcWNVNnhHaThqemps"
+            + "UnVLUUJ0cVJjWGkrdU1BNEdBMVVkRHdFQi93UUVBd0lGNERBTkJna3EKaGtpRzl3MEJBUXNGQUFP"
+            + "Q0FZRUFBZHc3N3E3c2hLdFM4bERHY0ovWThkRWpqTlNsUnRVMTRFTUM1OWttS2VmdApSaTdkMG9D"
+            + "UVh0ZFJDdXQzeW1pekxWcVFrbVg2U3JHc2hwV1VzTnpUZElUalE2SkIyS09haUlXSUY2ME5TbGVX"
+            + "CjB2TG0zNkVtWTFFcksrektlN3R2R1daaFROVnpCWHRucStBTWZKYzQxdTJ1ZWxreDBMTmN6c1g5"
+            + "YUNhakxIMXYKNHo0WHNVbm05cWlYcG5FbTYzMmVtdUp5ajZOdDBKV1Z1TlRKVFBSbnFWWmY2S0tS"
+            + "ODN2OEp1VjBFZWZXZDVXVgpjRnNwTDBIM01LSlY3dWY3aGZsbG5JY1J0elhhNXBjdEJDYm9GU2hW"
+            + "a1JOYUFNUHBKZjBEQkxReG03ZEFXajVBCmhHMXJ3bVRtek02TnB3R0hXL0kxU0ZNbXRRaUYwUEFD"
+            + "ejFVbjZuRFcvUmYxaUhFb0dmOFlCTFAzMzJMSlNEdWcKUktuMGNNM1FUY3lVRXpDWnhTd0tKMm5n"
+            + "QzllRzlDMmQzWWhCNlp4dGwrZ1VJYTNBd3dQYnFyN1lSOVFrRDJFbwpkNExxRUg5em55QmZpN2sy"
+            + "WUN3UDZydGZTaTZDbHliWGU4ZUJjdU1FUzRUQVFmRks2RlZmNTh0R1FJeDA2STBPCjM0bmVtWndr"
+            + "TG9PQnpaa2VwYVF2Ci0tLS0tRU5EIENFUlRJRklDQVRFLS0tLS0K";
+
+    private static final String ENCODED_CERTIFICATE_CHAIN_STRING =
+        "LS0tLS1CRUdJTiBDRVJUSUZJQ0FURS0tLS0tCk1JSUVpekNDQXZPZ0F3SUJBZ0lVR0VwMkdaNlk4"
+            + "bnpEQTlDS2w1blVSSTdDVU44d0RRWUpLb1pJaHZjTkFRRUwKQlFBd1lURWpNQ0VHQ2dtU0pvbVQ4"
+            + "aXhrQVFFTUUyTXRNR3BpWm5FNGNXRXhabTh3ZDJ0dGJua3hGVEFUQmdOVgpCQU1NREUxaGJtRm5a"
+            + "VzFsYm5SRFFURWpNQ0VHQTFVRUNnd2FSVXBDUTBFZ1EyOXVkR0ZwYm1WeUlGRjFhV05yCmMzUmhj"
+            + "blF3SGhjTk1qRXdOakk1TURZMU1ESTFXaGNOTWpNd05qSTVNRFkxTURJMFdqQjNNUkV3RHdZRFZR"
+            + "UUQKREFodmJtRndMbTl5WnpFWk1CY0dBMVVFQ3d3UVRHbHVkWGd0Um05MWJtUmhkR2x2YmpFTk1B"
+            + "c0dBMVVFQ2d3RQpUMDVCVURFV01CUUdBMVVFQnd3TlUyRnVMVVp5WVc1amFYTmpiekVUTUJFR0Ex"
+            + "VUVDQXdLUTJGc2FXWnZjbTVwCllURUxNQWtHQTFVRUJoTUNWVk13Z2dFaU1BMEdDU3FHU0liM0RR"
+            + "RUJBUVVBQTRJQkR3QXdnZ0VLQW9JQkFRREIKenZieXJyRWlhb0JqOGttYTJRbUMrVkxtbXRXRld5"
+            + "QUpnU3JZQTRreHV5cmpRQ1c0SnlGR3ZtemJZb1VGRkxPRgpoZnExOFZqVHMwY2JUeXNYOGNGU2Zr"
+            + "VjJFS0dFUkJhWm5aUlFzbzZTSUpOR2EzeE1lNUZIalJFeTM0TnAwNElICmpTUTQyZUlCZ2NOaUlh"
+            + "ZGE0amdFbklRUVlRSlNQUXRIa2ZPTUM2TyszUnBUL2VIdHZvNXVyUjE2TUZZMUs2c28KbldZaXRJ"
+            + "NVRwRUtSb3phdjZ6cVUvb3RIZ241alJMcnlqMElaeTBpamxCZlNLVHhyRmZacjNLb01EdWRWRWZV"
+            + "TQp0c3FFUjNwb2MxZ0ZrcW1DUkszOEJQTmlZN3Y1S0FUUkIrZldOK1A3NW13NDNkcng5ckltcCtK"
+            + "dHBPVXNESzhyCklCZDhvNGFmTnZyL1dyeWdCQjhyQWdNQkFBR2pnYVF3Z2FFd0RBWURWUjBUQVFI"
+            + "L0JBSXdBREFmQmdOVkhTTUUKR0RBV2dCUjlNMXFVblFNMENwSFV6MzRGNXNWVVVjSUR0akFZQmdO"
+            + "VkhSRUVFVEFQZ2cxMFpYTjBMbTl1WVhBdQpiM0puTUNjR0ExVWRKUVFnTUI0R0NDc0dBUVVGQndN"
+            + "Q0JnZ3JCZ0VGQlFjREJBWUlLd1lCQlFVSEF3RXdIUVlEClZSME9CQllFRkFmcWNVNnhHaThqemps"
+            + "UnVLUUJ0cVJjWGkrdU1BNEdBMVVkRHdFQi93UUVBd0lGNERBTkJna3EKaGtpRzl3MEJBUXNGQUFP"
+            + "Q0FZRUFBZHc3N3E3c2hLdFM4bERHY0ovWThkRWpqTlNsUnRVMTRFTUM1OWttS2VmdApSaTdkMG9D"
+            + "UVh0ZFJDdXQzeW1pekxWcVFrbVg2U3JHc2hwV1VzTnpUZElUalE2SkIyS09haUlXSUY2ME5TbGVX"
+            + "CjB2TG0zNkVtWTFFcksrektlN3R2R1daaFROVnpCWHRucStBTWZKYzQxdTJ1ZWxreDBMTmN6c1g5"
+            + "YUNhakxIMXYKNHo0WHNVbm05cWlYcG5FbTYzMmVtdUp5ajZOdDBKV1Z1TlRKVFBSbnFWWmY2S0tS"
+            + "ODN2OEp1VjBFZWZXZDVXVgpjRnNwTDBIM01LSlY3dWY3aGZsbG5JY1J0elhhNXBjdEJDYm9GU2hW"
+            + "a1JOYUFNUHBKZjBEQkxReG03ZEFXajVBCmhHMXJ3bVRtek02TnB3R0hXL0kxU0ZNbXRRaUYwUEFD"
+            + "ejFVbjZuRFcvUmYxaUhFb0dmOFlCTFAzMzJMSlNEdWcKUktuMGNNM1FUY3lVRXpDWnhTd0tKMm5n"
+            + "QzllRzlDMmQzWWhCNlp4dGwrZ1VJYTNBd3dQYnFyN1lSOVFrRDJFbwpkNExxRUg5em55QmZpN2sy"
+            + "WUN3UDZydGZTaTZDbHliWGU4ZUJjdU1FUzRUQVFmRks2RlZmNTh0R1FJeDA2STBPCjM0bmVtWndr"
+            + "TG9PQnpaa2VwYVF2Ci0tLS0tRU5EIENFUlRJRklDQVRFLS0tLS0KLS0tLS1CRUdJTiBDRVJUSUZJ"
+            + "Q0FURS0tLS0tCk1JSUVzekNDQXh1Z0F3SUJBZ0lVTk1lYzl0ZlJEU3FPQlJGaTFkWDd2RCsyVG9z"
+            + "d0RRWUpLb1pJaHZjTkFRRUwKQlFBd1lURWpNQ0VHQ2dtU0pvbVQ4aXhrQVFFTUUyTXRNR3BpWm5F"
+            + "NGNXRXhabTh3ZDJ0dGJua3hGVEFUQmdOVgpCQU1NREUxaGJtRm5aVzFsYm5SRFFURWpNQ0VHQTFV"
+            + "RUNnd2FSVXBDUTBFZ1EyOXVkR0ZwYm1WeUlGRjFhV05yCmMzUmhjblF3SGhjTk1qRXdOakk1TURZ"
+            + "ME9UQTFXaGNOTXpFd05qSTVNRFkwT1RBMFdqQmhNU013SVFZS0NaSW0KaVpQeUxHUUJBUXdUWXkw"
+            + "d2FtSm1jVGh4WVRGbWJ6QjNhMjF1ZVRFVk1CTUdBMVVFQXd3TVRXRnVZV2RsYldWdQpkRU5CTVNN"
+            + "d0lRWURWUVFLREJwRlNrSkRRU0JEYjI1MFlXbHVaWElnVVhWcFkydHpkR0Z5ZERDQ0FhSXdEUVlK"
+            + "CktvWklodmNOQVFFQkJRQURnZ0dQQURDQ0FZb0NnZ0dCQUtvRjduSzQzUDBaRi9tWUVCbU5GWENw"
+            + "MmZma2srcFoKS1hCdFRFY1UwZVZmQU5WMzRFNHZEcnFSc0k0U3RFdmt5NGxiWW1PUEx5SnVabnRk"
+            + "c1dyUC9rbi9kUENHWEEzQQovUE44WmNrUENBQVlwa0JuOFNsMVdxaW1UeTA3TStPM0UxOER0TnBO"
+            + "Sy9RNWVkWW0rRnFXU3BVWHY5NEMzbjZVCmVXKytWaWNlWWc0ZUFDMVBka01LZGV3VEdnWGYzK1lI"
+            + "Q1dySW9JeWozcDNCOUp4RDdXVVUzTEZ3UkdHWnljVU0KYnRla2FUZXhodDZ1N2JMeld0Ylg1ZHhw"
+            + "bTBuR1dZa05KVm1mN0pJOHErMGpZdUNDcXdjYXpTNHIyeko5K1BqVwoyclZ0TkdUdVE0RmQyMm1r"
+            + "c1RMK0FRbktJaW9jNEJadVcwTkM0emNPZ2Ztc2dRdnBsR2s1ZGlmY0RZeHU5c3hkClFGampMKzJ1"
+            + "UURaK0RMTWlkYXNHRGxEb3FSQXBnV0lnajFxZllOMVNNbXJFZkdKWjFud05WcTlmemswV2VHNEgK"
+            + "WmVBYjlnU3BxSk9LNlp6d0F0TTV5NlFxOXo4RC84U2hjS2JiN01waExiSnVGVFRyL1lWaE1QRVZE"
+            + "SHA5RGZMbApYbzhGbkJCRVplUE9FYmdPZk5XbzlhTkg4RlczcHc1Znd3SURBUUFCbzJNd1lUQVBC"
+            + "Z05WSFJNQkFmOEVCVEFECkFRSC9NQjhHQTFVZEl3UVlNQmFBRkgweldwU2RBelFLa2RUUGZnWG14"
+            + "VlJSd2dPMk1CMEdBMVVkRGdRV0JCUjkKTTFxVW5RTTBDcEhVejM0RjVzVlVVY0lEdGpBT0JnTlZI"
+            + "UThCQWY4RUJBTUNBWVl3RFFZSktvWklodmNOQVFFTApCUUFEZ2dHQkFLZUFSdHBweExodThZbms5"
+            + "RHJFWUFmZHVwb0pESWU0K0RHYlVyQ212LzlIcVozRWxSaHpYWWdqClJCSlgzSjR1eHdNcEZQZFdO"
+            + "Qk9nMWdzV2FQYkdYSGg4K1U0Y29HLzVjVm5abmYzRG1PelliVW5pYXU4eTFnclAKaWNyNTZLdDcr"
+            + "Q2tRMFIrWWxUdXBGM3M5WjlIZW5UaHA3YmQ5N3hZNXBFK2l3cG1hNjNmcHJhSFVBb01qQXZEYQpU"
+            + "S3ZRUDRZS3pJY1ZuamtEdzlqUUxyNGNxYTdaeU1EUVlNTTd5YUJZNkx0bDYxbU9xQ2l4Q2JMWStL"
+            + "MmlMV0lNCnRoT2grV3R0cXZRejFPc2x4VkV1cWZtak4zMHBhUy9xSWY4MjhLZHp4UEN6S0RnTVVP"
+            + "ZjdvTEZUa0JCcGVoWVkKYVd5SUFNd2hEa1grRXYzRXg4ZnRzRmJSUUdWOWMvcDJPUXd2TEdTOXdB"
+            + "cVUyM1pEckhaTTFla0J5RE5FZUVpUgpTSGRWOEtNSTJuQ0J0NlhUeFhTejkwME5EV0l4aXJET0Rp"
+            + "WmU5SGJJUm5hWlIzMEEyVCtTeElxYUpsNXZVQzYyCnlLbjNicnFUM1UyMlNlbmVpZ2w3bW81bWhL"
+            + "bE8wdHErc2lJK1Y0T3lORkhadnJHQUNaUTNxYUFUZlozYlN3RVcKYkg1QjRlbHRodz09Ci0tLS0t"
+            + "RU5EIENFUlRJRklDQVRFLS0tLS0K";
+
+    private static final String SUBJECT = "CN=onap.org,OU=Linux-Foundation,O=ONAP,L=San-Francisco,ST=California,C=US";
+    private static final GeneralName GENERAL_NAME = new GeneralName(GeneralName.dNSName, "test.onap.org");
+
+    private final X509CertificateModelFactory factory =
+        new X509CertificateModelFactory(new PemStringToCertificateConverter(), new X509CertificateParser());
+
+    @Test
+    void shouldCorrectlyParseX509CertificateFromCertificate()
+        throws CertificateDecryptionException {
+        //given
+        StringBase64 base64EncodedCertificate = new StringBase64(ENCODED_CERTIFICATE_STRING);
+        //when
+        final X509CertificateModel certificateModel = factory.createCertificateModel(base64EncodedCertificate);
+        //then
+        assertThat(certificateModel.getCertificate()).isNotNull();
+        assertThat(certificateModel.getSubjectData()).isEqualTo(new X500Name(SUBJECT));
+        assertThat(certificateModel.getSans()).containsExactly(GENERAL_NAME);
+    }
+
+    @Test
+    void shouldCorrectlyParseX509CertificateFromCertificateChain()
+        throws CertificateDecryptionException {
+        //given
+        StringBase64 base64EncodedCertificate = new StringBase64(ENCODED_CERTIFICATE_CHAIN_STRING);
+        //when
+        final X509CertificateModel certificateModel = factory.createCertificateModel(base64EncodedCertificate);
+        //then
+        assertThat(certificateModel.getCertificate()).isNotNull();
+        assertThat(certificateModel.getSubjectData()).isEqualTo(new X500Name(SUBJECT));
+        assertThat(certificateModel.getSans()).containsExactly(GENERAL_NAME);
+    }
+
+    @Test
+    void shouldThrowExceptionWhenCertificateChainHasNoCertificates() {
+        //given
+        StringBase64 base64EncodedCertificate = new StringBase64("");
+        //when, then
+        assertThatThrownBy(() -> factory.createCertificateModel(base64EncodedCertificate))
+            .isInstanceOf(CertificateDecryptionException.class);
+    }
+}
diff --git a/certService/src/test/java/org/onap/oom/certservice/certification/X509CertificateParserTest.java b/certService/src/test/java/org/onap/oom/certservice/certification/X509CertificateParserTest.java
new file mode 100644
index 00000000..4629234e
--- /dev/null
+++ b/certService/src/test/java/org/onap/oom/certservice/certification/X509CertificateParserTest.java
@@ -0,0 +1,84 @@
+/*
+ * ============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;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.when;
+
+import java.security.cert.CertificateParsingException;
+import java.security.cert.X509Certificate;
+import java.util.List;
+import javax.security.auth.x500.X500Principal;
+import org.bouncycastle.asn1.x500.X500Name;
+import org.bouncycastle.asn1.x509.GeneralName;
+import org.junit.jupiter.api.Test;
+
+class X509CertificateParserTest {
+
+    private static final String SUBJECT = "CN=onap.org,OU=Linux-Foundation,O=ONAP,L=San-Francisco,ST=California,C=US";
+
+    private final X509CertificateParser parser = new X509CertificateParser();
+
+    @Test
+    void getSubject_shouldReturnCorrectSubject() {
+        //given
+        X509Certificate certificate = mock(X509Certificate.class);
+        when(certificate.getSubjectX500Principal())
+            .thenReturn(new X500Principal(SUBJECT));
+        //when
+        final X500Name subject = parser.getSubject(certificate);
+        //then
+        assertThat(subject).isEqualTo(new X500Name(SUBJECT));
+    }
+
+    @Test
+    void getSans_shouldReturnCorrectSansArray() throws CertificateParsingException {
+        //given
+        X509Certificate certificate = mock(X509Certificate.class);
+        when(certificate.getSubjectAlternativeNames())
+            .thenReturn(List.of(
+                List.of(GeneralName.dNSName, "test.onap.org"),
+                List.of(GeneralName.dNSName, "test2.onap.org"),
+                List.of(GeneralName.iPAddress, "127.0.0.1")
+            ));
+        //when
+        final GeneralName[] sans = parser.getSans(certificate);
+        //then
+        assertThat(sans).containsExactlyInAnyOrder(
+            new GeneralName(GeneralName.dNSName, "test.onap.org"),
+            new GeneralName(GeneralName.dNSName, "test2.onap.org"),
+            new GeneralName(GeneralName.iPAddress, "127.0.0.1")
+        );
+    }
+
+    @Test
+    void getSans_shouldReturnEmptyArrayWhenNoSans() throws CertificateParsingException {
+        //given
+        X509Certificate certificate = mock(X509Certificate.class);
+        when(certificate.getSubjectAlternativeNames()).thenReturn(null);
+        //when
+        final GeneralName[] sans = parser.getSans(certificate);
+        //then
+        assertThat(sans).isEmpty();
+    }
+
+}
diff --git a/certService/src/test/java/org/onap/oom/certservice/certification/model/CertificateDataTest.java b/certService/src/test/java/org/onap/oom/certservice/certification/model/CertificateDataTest.java
new file mode 100644
index 00000000..e32ade8d
--- /dev/null
+++ b/certService/src/test/java/org/onap/oom/certservice/certification/model/CertificateDataTest.java
@@ -0,0 +1,117 @@
+/*
+ * ============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.model;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import java.util.stream.Stream;
+import org.bouncycastle.asn1.x500.X500Name;
+import org.bouncycastle.asn1.x509.GeneralName;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.MethodSource;
+
+class CertificateDataTest {
+
+    private static final String SUBJECT = "CN=onap.org,OU=Linux-Foundation,O=ONAP,L=San-Francisco,ST=California,C=US";
+    private static final String SUBJECT_CHANGED_ORDER = "ST=California,C=US,OU=Linux-Foundation,CN=onap.org,O=ONAP,L=San-Francisco";
+    private static final String OTHER_SUBJECT = "CN=onap1.org,OU=Linux-Foundation,O=ONAP,L=San-Francisco,ST=California,C=US";
+    private static final String DNS_NAME = "test.onap.org";
+    private static final String OTHER_DNS_NAME = "test1.onap.org";
+
+    private static Stream<Arguments> equalSubjectParameters() {
+        return Stream.of(
+            Arguments.of(SUBJECT, SUBJECT),
+            Arguments.of(SUBJECT_CHANGED_ORDER, SUBJECT_CHANGED_ORDER),
+            Arguments.of(SUBJECT, SUBJECT_CHANGED_ORDER),
+            Arguments.of(SUBJECT_CHANGED_ORDER, SUBJECT)
+        );
+    }
+
+    private static Stream<Arguments> notEqualSubjectParameters() {
+        return Stream.of(
+            Arguments.of(SUBJECT, OTHER_SUBJECT),
+            Arguments.of(OTHER_SUBJECT, SUBJECT),
+            Arguments.of(SUBJECT_CHANGED_ORDER, OTHER_SUBJECT),
+            Arguments.of(OTHER_SUBJECT, SUBJECT_CHANGED_ORDER)
+        );
+    }
+
+    @ParameterizedTest
+    @MethodSource("equalSubjectParameters")
+    void shouldAcceptSameSubjectData(String subject1, String subject2) {
+        //given
+        final CertificateData certificateData1 = new CertificateData(new X500Name(subject1), null);
+        final CertificateData certificateData2 = new CertificateData(new X500Name(subject2), null);
+        //when, then
+        assertThat(certificateData1).isEqualTo(certificateData2);
+    }
+
+    @ParameterizedTest
+    @MethodSource("notEqualSubjectParameters")
+    void shouldRejectDifferentSubjectData(String subject1, String subject2) {
+        //given
+        final CertificateData certificateData1 = new CertificateData(new X500Name(subject1), null);
+        final CertificateData certificateData2 = new CertificateData(new X500Name(subject2), null);
+        //when, then
+        assertThat(certificateData1).isNotEqualTo(certificateData2);
+    }
+
+    @Test
+    void shouldAcceptEqualSans() {
+        //given
+        final GeneralName[] sans1 = new GeneralName[]{new GeneralName(GeneralName.dNSName, DNS_NAME)};
+        final GeneralName[] sans2 = new GeneralName[]{new GeneralName(GeneralName.dNSName, DNS_NAME)};
+        final CertificateData certificateData1 = new CertificateData(new X500Name(SUBJECT), sans1);
+        final CertificateData certificateData2 = new CertificateData(new X500Name(SUBJECT), sans2);
+        //when, then
+        assertThat(certificateData1).isEqualTo(certificateData2);
+    }
+
+    @Test
+    void shouldRejectNotEqualSans() {
+        //given
+        final GeneralName[] sans1 = new GeneralName[]{new GeneralName(GeneralName.dNSName, DNS_NAME)};
+        final GeneralName[] sans2 = new GeneralName[]{new GeneralName(GeneralName.dNSName, OTHER_DNS_NAME)};
+        final CertificateData certificateData1 = new CertificateData(new X500Name(SUBJECT), sans1);
+        final CertificateData certificateData2 = new CertificateData(new X500Name(SUBJECT), sans2);
+        //when, then
+        assertThat(certificateData1).isNotEqualTo(certificateData2);
+    }
+
+    @Test
+    void shouldAcceptEqualSansIgnoringOrder() {
+        //given
+        GeneralName[] sans1 = new GeneralName[]{
+            new GeneralName(GeneralName.dNSName, DNS_NAME),
+            new GeneralName(GeneralName.dNSName, OTHER_DNS_NAME)
+        };
+        GeneralName[] sans2 = new GeneralName[]{
+            new GeneralName(GeneralName.dNSName, OTHER_DNS_NAME),
+            new GeneralName(GeneralName.dNSName, DNS_NAME)
+        };
+        final CertificateData certificateData1 = new CertificateData(new X500Name(SUBJECT), sans1);
+        final CertificateData certificateData2 = new CertificateData(new X500Name(SUBJECT), sans2);
+        //when, then
+        assertThat(certificateData1).isEqualTo(certificateData2);
+    }
+}