Return hardcoded CA certs and certification chain.

Issue-ID: AAF-995
Signed-off-by: Bartosz Gardziejewski <bartosz.gardziejewski@nokia.com>
Change-Id: I38b498c4deeedc4ea4323065c5f7b5ddd137209f

17 files changed, 475 insertions, 27 deletions

diff --git a/certService/pom.xml b/certService/pom.xml
index 194e2ae4..ea919f8c 100644
--- a/certService/pom.xml
+++ b/certService/pom.xml
@@ -44,6 +44,7 @@
         </springdoc-openapi-maven-plugin.apiDocsUrl>
         <docker-maven-plugin.image-name>onap/${project.artifactId}</docker-maven-plugin.image-name>
         <springdoc-openapi-maven-plugin.version>0.2</springdoc-openapi-maven-plugin.version>
+        <gson.version>2.8.6</gson.version>
     </properties>
 
     <dependencyManagement>
@@ -120,6 +121,11 @@
             <artifactId>bcprov-jdk15on</artifactId>
             <version>${bouncycastle.version}</version>
         </dependency>
+        <dependency>
+            <groupId>com.google.code.gson</groupId>
+            <artifactId>gson</artifactId>
+            <version>${gson.version}</version>
+        </dependency>
     </dependencies>
 
     <build>
diff --git a/certService/src/main/java/org/onap/aaf/certservice/api/CertificationService.java b/certService/src/main/java/org/onap/aaf/certservice/api/CertificationService.java
index a46e07fc..75fc0f52 100644
--- a/certService/src/main/java/org/onap/aaf/certservice/api/CertificationService.java
+++ b/certService/src/main/java/org/onap/aaf/certservice/api/CertificationService.java
@@ -20,10 +20,15 @@
 
 package org.onap.aaf.certservice.api;
 
+import com.google.gson.Gson;
+import org.onap.aaf.certservice.certification.CertificationModelFactory;
 import org.onap.aaf.certservice.certification.CsrModelFactory;
 import org.onap.aaf.certservice.certification.CsrModelFactory.StringBase64;
 import org.onap.aaf.certservice.certification.exceptions.CsrDecryptionException;
+import org.onap.aaf.certservice.certification.exceptions.PemDecryptionException;
+import org.onap.aaf.certservice.certification.model.CertificationModel;
 import org.onap.aaf.certservice.certification.model.CsrModel;
+import org.onap.aaf.certservice.certification.model.ErrorResponseModel;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.beans.factory.annotation.Autowired;
@@ -41,10 +46,12 @@ public class CertificationService {
     private static final Logger LOGGER = LoggerFactory.getLogger(CertificationService.class);
 
     private final CsrModelFactory csrModelFactory;
+    private final CertificationModelFactory certificationModelFactory;
 
     @Autowired
-    CertificationService(CsrModelFactory csrModelFactory) {
+    CertificationService(CsrModelFactory csrModelFactory, CertificationModelFactory certificationModelFactory) {
         this.csrModelFactory = csrModelFactory;
+        this.certificationModelFactory = certificationModelFactory;
     }
 
     /**
@@ -56,7 +63,7 @@ public class CertificationService {
      * @param encodedPrivateKey Private key for CSR, needed for PoP, encoded in Base64 form
      * @return JSON containing trusted certificates and certificate chain
      */
-    @GetMapping("v1/certificate/{caName}")
+    @GetMapping(value = "v1/certificate/{caName}", produces = "application/json; charset=utf-8")
     public ResponseEntity<String> signCertificate(
             @PathVariable String caName,
             @RequestHeader("CSR") String encodedCsr,
@@ -71,12 +78,26 @@ public class CertificationService {
                     new StringBase64(encodedPrivateKey)
             );
             LOGGER.debug("Received CSR meta data: \n{}", csrModel);
-            return new ResponseEntity<>(csrModel.toString(), HttpStatus.OK);
+            CertificationModel certificationModel = certificationModelFactory
+                    .createCertificationModel(csrModel,caName);
+            return new ResponseEntity<>(
+                    new Gson().toJson(certificationModel),
+                    HttpStatus.OK);
         } catch (CsrDecryptionException e) {
-            LOGGER.error("Exception occurred during certificate signing:", e);
-            return new ResponseEntity<>("Wrong certificate signing request (CSR) format", HttpStatus.BAD_REQUEST);
+            LOGGER.error("Exception occurred during decoding certificate sign request:", e);
+            return getErrorResponseEntity("Wrong certificate signing request (CSR) format");
+        } catch (PemDecryptionException e) {
+            LOGGER.error("Exception occurred during decoding key:", e);
+            return getErrorResponseEntity("Wrong key (PK) format");
         }
     }
 
+    private ResponseEntity<String> getErrorResponseEntity(String errorMessage) {
+        ErrorResponseModel errorResponse = new ErrorResponseModel(errorMessage);
+        return new ResponseEntity<>(
+                new Gson().toJson(errorResponse),
+                HttpStatus.BAD_REQUEST);
+    }
+
 
 }
diff --git a/certService/src/main/java/org/onap/aaf/certservice/certification/CertificationData.java b/certService/src/main/java/org/onap/aaf/certservice/certification/CertificationData.java
new file mode 100644
index 00000000..a347762e
--- /dev/null
+++ b/certService/src/main/java/org/onap/aaf/certservice/certification/CertificationData.java
@@ -0,0 +1,127 @@
+/*
+ * ============LICENSE_START=======================================================
+ * PROJECT
+ * ================================================================================
+ * 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.aaf.certservice.certification;
+
+
+final class CertificationData {
+
+    private CertificationData() {}
+
+    private static final String BEGIN_CERTIFICATE = "-----BEGIN CERTIFICATE-----\n";
+    private static final String END_CERTIFICATE = "-----END CERTIFICATE-----";
+
+    static final String EXTRA_CA_CERT = ""
+            + BEGIN_CERTIFICATE
+            + "MIIDvzCCAqcCFF5DejiyfoNfPiiMmBXulniBewBGMA0GCSqGSIb3DQEBCwUAMIGb\n"
+            + "MQswCQYDVQQGEwJVUzETMBEGA1UECAwKQ2FsaWZvcm5pYTEWMBQGA1UEBwwNU2Fu\n"
+            + "LUZyYW5jaXNjbzEZMBcGA1UECgwQTGludXgtRm91bmRhdGlvbjENMAsGA1UECwwE\n"
+            + "T05BUDEVMBMGA1UEAwwMbmV3Lm9uYXAub3JnMR4wHAYJKoZIhvcNAQkBFg90ZXN0\n"
+            + "ZXJAb25hcC5vcmcwHhcNMjAwMjEyMDk1OTM3WhcNMjEwMjExMDk1OTM3WjCBmzEL\n"
+            + "MAkGA1UEBhMCVVMxEzARBgNVBAgMCkNhbGlmb3JuaWExFjAUBgNVBAcMDVNhbi1G\n"
+            + "cmFuY2lzY28xGTAXBgNVBAoMEExpbnV4LUZvdW5kYXRpb24xDTALBgNVBAsMBE9O\n"
+            + "QVAxFTATBgNVBAMMDG5ldy5vbmFwLm9yZzEeMBwGCSqGSIb3DQEJARYPdGVzdGVy\n"
+            + "QG9uYXAub3JnMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAtF4FXeDV\n"
+            + "ng/inC/bTACmZnLC9IiC7PyG/vVbMxxN1bvQLRAwC/Hbl3i9zD68Vs/jPPr/SDr9\n"
+            + "2rgItdDdUY1V30Y3PT06F11XdEaRb+t++1NX0rDf1AqPaBZgnBmB86s1wbqHdJTr\n"
+            + "wEImDZ5xMPfP3fiWy/9Yw/U7iRMIi1/oI0lWuHJV0bn908shuJ6dvInpRCoDnoTX\n"
+            + "YP/FiDSZCFVewQcq4TigB7kRqZrDcPZWbSlqHklDMXRwbCxAiFSziuX6TBwru9Rn\n"
+            + "HhIeXVSgMU1ZSSopVbJGtQ4zSsU1nvTK5Bhc2UHGcAOZy1xTN5D9EEbTqh7l+Wtx\n"
+            + "y8ojkEXvFG8lVwIDAQABMA0GCSqGSIb3DQEBCwUAA4IBAQAE+bUphwHit78LK8sb\n"
+            + "OMjt4DiEu32KeSJOpYgPLeBeAIynaNsa7sQrpuxerGNTmQWIcw6olXI0J+OOwkik\n"
+            + "II7elrYtd5G1uALxXWdamNsaY0Du34moVL1YjexJ7qQ4oBUxg2tuY8NAQGDK+23I\n"
+            + "nCA+ZwzdTJo73TYS6sx64d/YLWkX4nHGUoMlF+xUH34csDyhpuTSzQhC2quB5N8z\n"
+            + "tSFdpe4z2jqx07qo2EBFxi03EQ8Q0ex6l421QM2gbs7cZQ66K0DkpPcF2+iHZnyx\n"
+            + "xq1lnlsWHklElF2bhyXTn3fPp5wtan00P8IolKx7CAWb92QjkW6M0RvTW/xuwIzh\n"
+            + "0rTO\n"
+            + END_CERTIFICATE;
+
+    static final String CA_CERT = ""
+            + BEGIN_CERTIFICATE
+            + "MIIDtzCCAp8CFAwqQddh4/iyGfP8UZ3dpXlxfAN8MA0GCSqGSIb3DQEBCwUAMIGX\n"
+            + "MQswCQYDVQQGEwJVUzETMBEGA1UECAwKQ2FsaWZvcm5pYTEWMBQGA1UEBwwNU2Fu\n"
+            + "LUZyYW5jaXNjbzEZMBcGA1UECgwQTGludXgtRm91bmRhdGlvbjENMAsGA1UECwwE\n"
+            + "T05BUDERMA8GA1UEAwwIb25hcC5vcmcxHjAcBgkqhkiG9w0BCQEWD3Rlc3RlckBv\n"
+            + "bmFwLm9yZzAeFw0yMDAyMTIwOTM0MjdaFw0yMTAyMTEwOTM0MjdaMIGXMQswCQYD\n"
+            + "VQQGEwJVUzETMBEGA1UECAwKQ2FsaWZvcm5pYTEWMBQGA1UEBwwNU2FuLUZyYW5j\n"
+            + "aXNjbzEZMBcGA1UECgwQTGludXgtRm91bmRhdGlvbjENMAsGA1UECwwET05BUDER\n"
+            + "MA8GA1UEAwwIb25hcC5vcmcxHjAcBgkqhkiG9w0BCQEWD3Rlc3RlckBvbmFwLm9y\n"
+            + "ZzCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAMCFrnO7/eT6V+7XkPPd\n"
+            + "eiL/6xXreuegvit/1/jTVjG+3AOVcmTn2WXwXXRcQLvkWQfJVPoltsY8E3FqFRti\n"
+            + "797XjY6cdQJFVDyzNU0+Fb4vJL9FK5wSvnS6EFjBEn3JvXRlENorDCs/mfjkjJoa\n"
+            + "Dl74gXQEJYcg4nsTeNIj7cm3Q7VK3mZt1t7LSJJ+czxv69UJDuNJpmQ/2WOKyLZA\n"
+            + "gTtBJ+Hyol45/OLsrqwq1dAn9ZRWIFPvRt/XQYH9bI/6MtqSreRVUrdYCiTe/XpP\n"
+            + "B/OM6NEi2+p5QLi3Yi70CEbqP3HqUVbkzF+r7bwIb6M5/HxfqzLmGwLvD+6rYnUn\n"
+            + "Bm8CAwEAATANBgkqhkiG9w0BAQsFAAOCAQEAhXoO65DXth2X/zFRNsCNpLwmDy7r\n"
+            + "PxT9ZAIZAzSxx3/aCYiuTrKP1JnqjkO+F2IbikrI4n6sKO49SKnRf9SWTFhd+5dX\n"
+            + "vxq5y7MaqxHAY9J7+Qzq33+COVFQnaF7ddel2NbyUVb2b9ZINNsaZkkPXui6DtQ7\n"
+            + "/Fb/1tmAGWd3hMp75G2thBSzs816JMKKa9WD+4VGATEs6OSll4sv2fOZEn+0mAD3\n"
+            + "9q9c+WtLGIudOwcHwzPb2njtNntQSCK/tVOqbY+vzhMY3JW+p9oSrLDSdGC+pAKK\n"
+            + "m/wB+2VPIYcsPMtIhHC4tgoSaiCqjXYptaOh4b8ye8CPBUCpX/AYYkN0Ow==\n"
+            + END_CERTIFICATE;
+
+    static final String INTERMEDIATE_CERT = ""
+            + BEGIN_CERTIFICATE
+            + "MIIDqTCCApGgAwIBAgICEAAwDQYJKoZIhvcNAQELBQAwgZcxCzAJBgNVBAYTAlVT\n"
+            + "MRMwEQYDVQQIDApDYWxpZm9ybmlhMRYwFAYDVQQHDA1TYW4tRnJhbmNpc2NvMRkw\n"
+            + "FwYDVQQKDBBMaW51eC1Gb3VuZGF0aW9uMQ0wCwYDVQQLDARPTkFQMREwDwYDVQQD\n"
+            + "DAhvbmFwLm9yZzEeMBwGCSqGSIb3DQEJARYPdGVzdGVyQG9uYXAub3JnMB4XDTIw\n"
+            + "MDIxMjA5NDAxMloXDTIyMTEwODA5NDAxMlowgYQxCzAJBgNVBAYTAlVTMRMwEQYD\n"
+            + "VQQIDApDYWxpZm9ybmlhMRYwFAYDVQQHDA1TYW4tRnJhbmNpc2NvMRkwFwYDVQQK\n"
+            + "DBBMaW51eC1Gb3VuZGF0aW9uMQ0wCwYDVQQLDARPTkFQMR4wHAYDVQQDDBVpbnRl\n"
+            + "cm1lZGlhdGUub25hcC5vcmcwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIB\n"
+            + "AQC1oOYMZ6G+2DGDAizYnzdCNiogivlht1s4oqgem7fM1XFPxD2p31ATIibOdqr/\n"
+            + "gv1qemO9Q4r1xn6w1Ufq7T1K7PjnMzdSeTqZefurE2JM/HHx2QvW4TjMlz2ILgaD\n"
+            + "L1LN60kmMQSOi5VxKJpsrCQxbOsxhvefd212gny5AZMcjJe23kUd9OxUrtvpdLEv\n"
+            + "wI3vFEvT7oRUnEUg/XNz7qeg33vf1C39yMR+6O4s6oevgsEebVKjb+yOoS6zzGtz\n"
+            + "72wZjm07C54ZlO+4Uy+QAlMjRiU3mgWkKbkOy+4CvwehjhpTikdBs2DX39ZLGHhn\n"
+            + "L/0a2NYtGulp9XEqmTvRoI+PAgMBAAGjEDAOMAwGA1UdEwQFMAMBAf8wDQYJKoZI\n"
+            + "hvcNAQELBQADggEBADcitdJ6YswiV8jAD9GK0gf3+zqcGegt4kt+79JXlXYbb1sY\n"
+            + "q3o6prcB7nSUoClgF2xUPCslFGpM0Er9FCSFElQM/ru0l/KVmJS6kSpwEHvsYIH3\n"
+            + "q5anta+Pyk8JSQWAAw+qrind0uBQMnhR8Tn13tgV+Kjvg/xlH/nZIEdN5YtLB1cA\n"
+            + "beVsZRyRfVL9DeZU8s/MZ5wC3kgcEp5A4m5lg7HyBxBdqhzFcDr6xiy6OGqW8Yep\n"
+            + "xrwfc8Fw8a/lOv4U+tBeGNKPQDYaL9hh+oM+qMkNXsHXDqdJsuEGJtU4i3Wcwzoc\n"
+            + "XGN5NWV//4bP+NFmwgcn7AYCdRvz04A8GU/0Cwg=\n"
+            + END_CERTIFICATE;
+
+    static final String ENTITY_CERT = ""
+            + BEGIN_CERTIFICATE
+            + "MIIDjDCCAnSgAwIBAgICEAIwDQYJKoZIhvcNAQELBQAwgYQxCzAJBgNVBAYTAlVT\n"
+            + "MRMwEQYDVQQIDApDYWxpZm9ybmlhMRYwFAYDVQQHDA1TYW4tRnJhbmNpc2NvMRkw\n"
+            + "FwYDVQQKDBBMaW51eC1Gb3VuZGF0aW9uMQ0wCwYDVQQLDARPTkFQMR4wHAYDVQQD\n"
+            + "DBVpbnRlcm1lZGlhdGUub25hcC5vcmcwHhcNMjAwMjEyMDk1MTI2WhcNMjIxMTA4\n"
+            + "MDk1MTI2WjB7MQswCQYDVQQGEwJVUzETMBEGA1UECAwKQ2FsaWZvcm5pYTEWMBQG\n"
+            + "A1UEBwwNU2FuLUZyYW5jaXNjbzEZMBcGA1UECgwQTGludXgtRm91bmRhdGlvbjEN\n"
+            + "MAsGA1UECwwET05BUDEVMBMGA1UEAwwMdmlkLm9uYXAub3JnMIIBIjANBgkqhkiG\n"
+            + "9w0BAQEFAAOCAQ8AMIIBCgKCAQEAw+GIRzJzUOh0gtc+wzFJEdTnn+q5F10L0Yhr\n"
+            + "G1xKdjPieHIFGsoiXwcuCU8arNSqlz7ocx62KQRkcA8y6edlOAsYtdOEJvqEI9vc\n"
+            + "eyTB/HYsbzw3URPGch4AmibrQkKU9QvGwouHtHn4R2Ft2Y0tfEqv9hxj9v4njq4A\n"
+            + "EiDLAFLl5FmVyCZu/MtKngSgu1smcaFKTYySPMxytgJZexoa/ALZyyE0gRhsvwHm\n"
+            + "NLGCPt1bmE/PEGZybsCqliyTO0S56ncD55The7+D/UDS4kE1Wg0svlWon/YsE6QW\n"
+            + "B3oeJDX7Kr8ebDTIAErevIAD7Sm4ee5se2zxYrsYlj0MzHZtvwIDAQABoxAwDjAM\n"
+            + "BgNVHRMEBTADAQH/MA0GCSqGSIb3DQEBCwUAA4IBAQCvQ1pTvjON6vSlcJRKSY4r\n"
+            + "8q7L4/9ZaVXWJAjzEYJtPIqsgGiPWz0vGfgklowU6tZxp9zRZFXfMil+mPQSe+yo\n"
+            + "ULrZSQ/z48YHPueE/BNO/nT4aaVBEhPLR5aVwC7uQVX8H+m1V1UGT8lk9vdI9rej\n"
+            + "CI9l524sLCpdE4dFXiWK2XHEZ0Vfylk221u3IYEogVVA+UMX7BFPSsOnI2vtYK/i\n"
+            + "lwZtlri8LtTusNe4oiTkYyq+RSyDhtAswg8ANgvfHolhCHoLFj6w1IkG88UCmbwN\n"
+            + "d7BoGMy06y5MJxyXEZG0vR7eNeLey0TIh+rAszAFPsIQvrOHW+HuA+WLQAj1mhnm\n"
+            + END_CERTIFICATE;
+
+}
diff --git a/certService/src/main/java/org/onap/aaf/certservice/certification/CertificationModelFactory.java b/certService/src/main/java/org/onap/aaf/certservice/certification/CertificationModelFactory.java
new file mode 100644
index 00000000..1b10c379
--- /dev/null
+++ b/certService/src/main/java/org/onap/aaf/certservice/certification/CertificationModelFactory.java
@@ -0,0 +1,51 @@
+/*
+ * ============LICENSE_START=======================================================
+ * PROJECT
+ * ================================================================================
+ * 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.aaf.certservice.certification;
+
+import org.onap.aaf.certservice.certification.model.CertificationModel;
+import org.onap.aaf.certservice.certification.model.CsrModel;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.stereotype.Service;
+
+import java.util.Arrays;
+
+import static org.onap.aaf.certservice.certification.CertificationData.CA_CERT;
+import static org.onap.aaf.certservice.certification.CertificationData.ENTITY_CERT;
+import static org.onap.aaf.certservice.certification.CertificationData.INTERMEDIATE_CERT;
+import static org.onap.aaf.certservice.certification.CertificationData.EXTRA_CA_CERT;
+
+@Service
+public class CertificationModelFactory {
+
+    private static final Logger LOGGER = LoggerFactory.getLogger(CertificationModelFactory.class);
+
+
+    public CertificationModel createCertificationModel(CsrModel csr, String caName) {
+        LOGGER.info("Generating certificates for CA named: {}, and certificate signing request:\n{}",
+                caName, csr);
+        return new CertificationModel(
+                Arrays.asList(ENTITY_CERT, INTERMEDIATE_CERT),
+                Arrays.asList(CA_CERT, EXTRA_CA_CERT)
+        );
+    }
+
+}
diff --git a/certService/src/main/java/org/onap/aaf/certservice/certification/CsrModelFactory.java b/certService/src/main/java/org/onap/aaf/certservice/certification/CsrModelFactory.java
index 98daa6eb..c1262e1e 100644
--- a/certService/src/main/java/org/onap/aaf/certservice/certification/CsrModelFactory.java
+++ b/certService/src/main/java/org/onap/aaf/certservice/certification/CsrModelFactory.java
@@ -26,6 +26,7 @@ import java.util.Base64;
 import org.bouncycastle.pkcs.PKCS10CertificationRequest;
 import org.bouncycastle.util.io.pem.PemObject;
 import org.onap.aaf.certservice.certification.exceptions.CsrDecryptionException;
+import org.onap.aaf.certservice.certification.exceptions.PemDecryptionException;
 import org.onap.aaf.certservice.certification.model.CsrModel;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -38,7 +39,8 @@ public class CsrModelFactory {
     private static final Logger LOGGER = LoggerFactory.getLogger(CsrModelFactory.class);
     private final PemObjectFactory pemObjectFactory = new PemObjectFactory();
 
-    public CsrModel createCsrModel(StringBase64 csr, StringBase64 privateKey) throws CsrDecryptionException {
+    public CsrModel createCsrModel(StringBase64 csr, StringBase64 privateKey)
+            throws CsrDecryptionException, PemDecryptionException {
         LOGGER.debug("Decoded CSR: \n{}", csr);
 
         try {
diff --git a/certService/src/main/java/org/onap/aaf/certservice/certification/PemObjectFactory.java b/certService/src/main/java/org/onap/aaf/certservice/certification/PemObjectFactory.java
index 08ffc56d..61ea0aaf 100644
--- a/certService/src/main/java/org/onap/aaf/certservice/certification/PemObjectFactory.java
+++ b/certService/src/main/java/org/onap/aaf/certservice/certification/PemObjectFactory.java
@@ -26,18 +26,18 @@ import java.io.StringReader;
 import org.bouncycastle.util.io.pem.PemObject;
 import org.bouncycastle.util.io.pem.PemReader;
 
-import org.onap.aaf.certservice.certification.exceptions.CsrDecryptionException;
+import org.onap.aaf.certservice.certification.exceptions.PemDecryptionException;
 
 
 public class PemObjectFactory {
 
-    public PemObject createPemObject(String pem) throws CsrDecryptionException {
+    public PemObject createPemObject(String pem) throws PemDecryptionException {
 
         try (StringReader stringReader = new StringReader(pem);
              PemReader pemReader = new PemReader(stringReader)) {
             return pemReader.readPemObject();
         } catch (IOException e) {
-            throw new CsrDecryptionException("Unable to create PEM", e);
+            throw new PemDecryptionException("Unable to create PEM", e);
         }
     }
 
diff --git a/certService/src/main/java/org/onap/aaf/certservice/certification/exceptions/CsrDecryptionException.java b/certService/src/main/java/org/onap/aaf/certservice/certification/exceptions/CsrDecryptionException.java
index fb16ad91..2f3f3659 100644
--- a/certService/src/main/java/org/onap/aaf/certservice/certification/exceptions/CsrDecryptionException.java
+++ b/certService/src/main/java/org/onap/aaf/certservice/certification/exceptions/CsrDecryptionException.java
@@ -20,7 +20,7 @@
 
 package org.onap.aaf.certservice.certification.exceptions;
 
-public class CsrDecryptionException extends Exception {
+public class CsrDecryptionException extends DecryptionException {
     public CsrDecryptionException(String message, Throwable cause) {
         super(message, cause);
     }
diff --git a/certService/src/main/java/org/onap/aaf/certservice/certification/exceptions/DecryptionException.java b/certService/src/main/java/org/onap/aaf/certservice/certification/exceptions/DecryptionException.java
new file mode 100644
index 00000000..67249cd5
--- /dev/null
+++ b/certService/src/main/java/org/onap/aaf/certservice/certification/exceptions/DecryptionException.java
@@ -0,0 +1,27 @@
+/*
+ * ============LICENSE_START=======================================================
+ * PROJECT
+ * ================================================================================
+ * 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.aaf.certservice.certification.exceptions;
+
+public class DecryptionException extends Exception {
+    public DecryptionException(String message, Throwable cause) {
+        super(message, cause);
+    }
+}
diff --git a/certService/src/main/java/org/onap/aaf/certservice/certification/exceptions/PemDecryptionException.java b/certService/src/main/java/org/onap/aaf/certservice/certification/exceptions/PemDecryptionException.java
new file mode 100644
index 00000000..564660e5
--- /dev/null
+++ b/certService/src/main/java/org/onap/aaf/certservice/certification/exceptions/PemDecryptionException.java
@@ -0,0 +1,28 @@
+/*
+ * ============LICENSE_START=======================================================
+ * PROJECT
+ * ================================================================================
+ * 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.aaf.certservice.certification.exceptions;
+
+public class PemDecryptionException extends DecryptionException {
+    public PemDecryptionException(String message, Throwable cause) {
+        super(message, cause);
+    }
+
+}
diff --git a/certService/src/main/java/org/onap/aaf/certservice/certification/model/CertificationModel.java b/certService/src/main/java/org/onap/aaf/certservice/certification/model/CertificationModel.java
new file mode 100644
index 00000000..b851d0d9
--- /dev/null
+++ b/certService/src/main/java/org/onap/aaf/certservice/certification/model/CertificationModel.java
@@ -0,0 +1,44 @@
+/*
+ * ============LICENSE_START=======================================================
+ * PROJECT
+ * ================================================================================
+ * 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.aaf.certservice.certification.model;
+
+import java.util.Collections;
+import java.util.List;
+
+public class CertificationModel {
+
+    private final List<String> certificateChain;
+    private final List<String> trustedCertificates;
+
+    public CertificationModel(List<String> certificateChain, List<String> trustedCertificates) {
+        this.certificateChain = certificateChain;
+        this.trustedCertificates = trustedCertificates;
+    }
+
+    public List<String> getCertificateChain() {
+        return Collections.unmodifiableList(certificateChain);
+    }
+
+    public List<String> getTrustedCertificates() {
+        return Collections.unmodifiableList(trustedCertificates);
+    }
+
+}
diff --git a/certService/src/main/java/org/onap/aaf/certservice/certification/model/ErrorResponseModel.java b/certService/src/main/java/org/onap/aaf/certservice/certification/model/ErrorResponseModel.java
new file mode 100644
index 00000000..bca7915d
--- /dev/null
+++ b/certService/src/main/java/org/onap/aaf/certservice/certification/model/ErrorResponseModel.java
@@ -0,0 +1,36 @@
+/*
+ * ============LICENSE_START=======================================================
+ * PROJECT
+ * ================================================================================
+ * 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.aaf.certservice.certification.model;
+
+public class ErrorResponseModel {
+
+    private final String errorMessage;
+
+    public ErrorResponseModel(String errorMessage) {
+        this.errorMessage = errorMessage;
+    }
+
+    public String getErrorMessage() {
+        return errorMessage;
+    }
+
+}
+
diff --git a/certService/src/test/java/org/onap/aaf/certservice/api/CertificationServiceTest.java b/certService/src/test/java/org/onap/aaf/certservice/api/CertificationServiceTest.java
index 9367fcb1..8ee88db5 100644
--- a/certService/src/test/java/org/onap/aaf/certservice/api/CertificationServiceTest.java
+++ b/certService/src/test/java/org/onap/aaf/certservice/api/CertificationServiceTest.java
@@ -20,19 +20,26 @@
 
 package org.onap.aaf.certservice.api;
 
+import com.google.gson.Gson;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 import org.mockito.Mock;
 import org.mockito.MockitoAnnotations;
+import org.onap.aaf.certservice.certification.CertificationModelFactory;
 import org.onap.aaf.certservice.certification.CsrModelFactory;
 import org.onap.aaf.certservice.certification.CsrModelFactory.StringBase64;
 import org.onap.aaf.certservice.certification.exceptions.CsrDecryptionException;
+import org.onap.aaf.certservice.certification.exceptions.DecryptionException;
+import org.onap.aaf.certservice.certification.exceptions.PemDecryptionException;
+import org.onap.aaf.certservice.certification.model.CertificationModel;
 import org.onap.aaf.certservice.certification.model.CsrModel;
 import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
 
 import java.io.IOException;
+import java.util.Arrays;
 
+import static org.assertj.core.api.Assertions.assertThat;
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 import static org.mockito.ArgumentMatchers.any;
@@ -47,43 +54,75 @@ class CertificationServiceTest {
     @Mock
     private CsrModelFactory csrModelFactory;
 
+    @Mock
+    private CertificationModelFactory certificationModelFactory;
+
     @BeforeEach
     void serUp() {
         MockitoAnnotations.initMocks(this);
-        certificationService = new CertificationService(csrModelFactory);
+        certificationService = new CertificationService(csrModelFactory, certificationModelFactory);
     }
 
     @Test
-    void shouldReturnDataAboutCsrBaseOnEncodedParameters() throws CsrDecryptionException {
+    void shouldReturnDataAboutCsrBaseOnEncodedParameters() throws DecryptionException {
         // given
         final String testStringCsr = "testData";
+        final String testCaName = "TestCa";
         CsrModel mockedCsrModel = mock(CsrModel.class);
+        CertificationModel testCertificationModel = new CertificationModel(
+                Arrays.asList("ENTITY_CERT", "INTERMEDIATE_CERT"),
+                Arrays.asList("CA_CERT", "EXTRA_CA_CERT")
+        );
         when(mockedCsrModel.toString()).thenReturn(testStringCsr);
         when(csrModelFactory.createCsrModel(any(StringBase64.class), any(StringBase64.class)))
                 .thenReturn(mockedCsrModel);
+        when(certificationModelFactory.createCertificationModel(mockedCsrModel, testCaName))
+                .thenReturn(testCertificationModel);
 
         // when
         ResponseEntity<String> testResponse =
-                certificationService.signCertificate("TestCa", "encryptedCSR", "encryptedPK");
+                certificationService.signCertificate(testCaName, "encryptedCSR", "encryptedPK");
+
+        CertificationModel responseCertificationModel = new Gson().fromJson(testResponse.getBody(), CertificationModel.class);
 
         // then
         assertEquals(HttpStatus.OK, testResponse.getStatusCode());
+        assertThat(responseCertificationModel
+        ).isEqualToComparingFieldByField(testCertificationModel);
+
+    }
+
+    @Test
+    void shouldReturnBadRequestWhenCreatingCsrModelFails() throws DecryptionException {
+        // given
+        when(csrModelFactory.createCsrModel(any(StringBase64.class), any(StringBase64.class)))
+                .thenThrow(new CsrDecryptionException("CSR creation fail",new IOException()));
+
+        // when
+        ResponseEntity<String> testResponse =
+                certificationService.signCertificate("TestCa", "encryptedCSR", "encryptedPK");
+
+        String expectedMessage = "Wrong certificate signing request (CSR) format";
+
+        // then
+        assertEquals(HttpStatus.BAD_REQUEST, testResponse.getStatusCode());
         assertTrue(
-                testResponse.toString().contains(testStringCsr)
+                testResponse.toString().contains(expectedMessage)
         );
+
     }
 
     @Test
-    void shouldReturnBadRequestWhenCreatingCsrModelFails() throws CsrDecryptionException {
+    void shouldReturnBadRequestWhenCreatingPemModelFails() throws DecryptionException {
         // given
         when(csrModelFactory.createCsrModel(any(StringBase64.class), any(StringBase64.class)))
-                .thenThrow(new CsrDecryptionException("creation fail",new IOException()));
+                .thenThrow(new PemDecryptionException("PEM creation fail",new IOException()));
 
         // when
         ResponseEntity<String> testResponse =
                 certificationService.signCertificate("TestCa", "encryptedCSR", "encryptedPK");
 
-        String expectedMessage = "Wrong certificate signing request (CSR) format";
+        String expectedMessage = "Wrong key (PK) format";
 
         // then
         assertEquals(HttpStatus.BAD_REQUEST, testResponse.getStatusCode());
diff --git a/certService/src/test/java/org/onap/aaf/certservice/certification/CertificationModelFactoryTest.java b/certService/src/test/java/org/onap/aaf/certservice/certification/CertificationModelFactoryTest.java
new file mode 100644
index 00000000..2953af78
--- /dev/null
+++ b/certService/src/test/java/org/onap/aaf/certservice/certification/CertificationModelFactoryTest.java
@@ -0,0 +1,63 @@
+/*
+ * ============LICENSE_START=======================================================
+ * PROJECT
+ * ================================================================================
+ * 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.aaf.certservice.certification;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.onap.aaf.certservice.certification.model.CertificationModel;
+import org.onap.aaf.certservice.certification.model.CsrModel;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.mockito.Mockito.mock;
+import static org.onap.aaf.certservice.certification.CertificationData.CA_CERT;
+import static org.onap.aaf.certservice.certification.CertificationData.ENTITY_CERT;
+import static org.onap.aaf.certservice.certification.CertificationData.INTERMEDIATE_CERT;
+import static org.onap.aaf.certservice.certification.CertificationData.EXTRA_CA_CERT;
+
+
+class CertificationModelFactoryTest {
+
+
+    private CertificationModelFactory certificationModelFactory;
+
+    @BeforeEach
+    void setUp() {
+        certificationModelFactory = new CertificationModelFactory();
+    }
+
+    @Test
+    void shouldCreateProperCertificationModelWhenGivenProperCsrModelAndCaName() {
+        // given
+        final String testCaName = "testCA";
+        CsrModel mockedCsrModel = mock(CsrModel.class);
+
+        // when
+        CertificationModel certificationModel = certificationModelFactory.createCertificationModel(mockedCsrModel ,testCaName);
+
+        //then
+        assertEquals(2, certificationModel.getCertificateChain().size());
+        assertThat(certificationModel.getCertificateChain()).contains(INTERMEDIATE_CERT, ENTITY_CERT);
+        assertEquals(2, certificationModel.getTrustedCertificates().size());
+        assertThat(certificationModel.getTrustedCertificates()).contains(CA_CERT, EXTRA_CA_CERT);
+    }
+
+}
diff --git a/certService/src/test/java/org/onap/aaf/certservice/certification/CsrModelFactoryTest.java b/certService/src/test/java/org/onap/aaf/certservice/certification/CsrModelFactoryTest.java
index 8b5f5dc5..065c7a0e 100644
--- a/certService/src/test/java/org/onap/aaf/certservice/certification/CsrModelFactoryTest.java
+++ b/certService/src/test/java/org/onap/aaf/certservice/certification/CsrModelFactoryTest.java
@@ -25,6 +25,7 @@ import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 import org.onap.aaf.certservice.certification.CsrModelFactory.StringBase64;
 import org.onap.aaf.certservice.certification.exceptions.CsrDecryptionException;
+import org.onap.aaf.certservice.certification.exceptions.DecryptionException;
 import org.onap.aaf.certservice.certification.model.CsrModel;
 
 import static org.junit.jupiter.api.Assertions.assertThrows;
@@ -44,7 +45,7 @@ class CsrModelFactoryTest {
     }
 
     @Test
-    void shouldDecryptCsrAndReturnStringWithDataAboutIt() throws CsrDecryptionException {
+    void shouldDecryptCsrAndReturnStringWithDataAboutIt() throws DecryptionException {
         // given
         String encoderCsr = new String(Base64.encode(TEST_CSR.getBytes()));
         String encoderPK = new String(Base64.encode(TEST_PK.getBytes()));
diff --git a/certService/src/test/java/org/onap/aaf/certservice/certification/PemObjectFactoryTest.java b/certService/src/test/java/org/onap/aaf/certservice/certification/PemObjectFactoryTest.java
index 2fa747db..479c375b 100644
--- a/certService/src/test/java/org/onap/aaf/certservice/certification/PemObjectFactoryTest.java
+++ b/certService/src/test/java/org/onap/aaf/certservice/certification/PemObjectFactoryTest.java
@@ -24,6 +24,7 @@ import org.bouncycastle.util.io.pem.PemObject;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 import org.onap.aaf.certservice.certification.exceptions.CsrDecryptionException;
+import org.onap.aaf.certservice.certification.exceptions.PemDecryptionException;
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertThrows;
@@ -44,7 +45,7 @@ class PemObjectFactoryTest {
     }
 
     @Test
-    void shouldTransformStringInToPemObjectAndBackToString() throws CsrDecryptionException {
+    void shouldTransformStringInToPemObjectAndBackToString() throws PemDecryptionException {
         // when
         PemObject pemObject = pemObjectFactory.createPemObject(TEST_PEM);
         String parsedPemObject = pemObjectToString(pemObject);
@@ -57,7 +58,7 @@ class PemObjectFactoryTest {
     void shouldThrowExceptionWhenParsingPemFailed() {
         // when
         Exception exception = assertThrows(
-                CsrDecryptionException.class, () -> pemObjectFactory.createPemObject(TEST_WRONG_PEM)
+                PemDecryptionException.class, () -> pemObjectFactory.createPemObject(TEST_WRONG_PEM)
         );
 
         String expectedMessage = "Unable to create PEM";
diff --git a/certService/src/test/java/org/onap/aaf/certservice/certification/TestUtils.java b/certService/src/test/java/org/onap/aaf/certservice/certification/TestUtils.java
index 156cf8ba..c2824c80 100644
--- a/certService/src/test/java/org/onap/aaf/certservice/certification/TestUtils.java
+++ b/certService/src/test/java/org/onap/aaf/certservice/certification/TestUtils.java
@@ -22,7 +22,7 @@ package org.onap.aaf.certservice.certification;
 
 import org.bouncycastle.util.io.pem.PemObject;
 import org.bouncycastle.util.io.pem.PemWriter;
-import org.onap.aaf.certservice.certification.exceptions.CsrDecryptionException;
+import org.onap.aaf.certservice.certification.exceptions.PemDecryptionException;
 
 import java.io.IOException;
 import java.io.StringWriter;
@@ -33,7 +33,7 @@ public final class TestUtils {
     private TestUtils() {
     }
 
-    public static String pemObjectToString(PemObject pemObject) throws CsrDecryptionException {
+    public static String pemObjectToString(PemObject pemObject) throws PemDecryptionException {
         try (StringWriter output = new StringWriter()) {
             PemWriter pemWriter = new PemWriter(output);
             pemWriter.writeObject(pemObject);
@@ -41,7 +41,7 @@ public final class TestUtils {
             return output.getBuffer().toString();
 
         } catch (IOException e) {
-            throw new CsrDecryptionException("Writing PAM Object to string failed", e);
+            throw new PemDecryptionException("Writing PAM Object to string failed", e);
         }
     }
 }
diff --git a/certService/src/test/java/org/onap/aaf/certservice/certification/model/CsrModelTest.java b/certService/src/test/java/org/onap/aaf/certservice/certification/model/CsrModelTest.java
index c6ff2a9f..9d748150 100644
--- a/certService/src/test/java/org/onap/aaf/certservice/certification/model/CsrModelTest.java
+++ b/certService/src/test/java/org/onap/aaf/certservice/certification/model/CsrModelTest.java
@@ -26,6 +26,8 @@ import org.bouncycastle.util.io.pem.PemObject;
 import org.junit.jupiter.api.Test;
 import org.onap.aaf.certservice.certification.PemObjectFactory;
 import org.onap.aaf.certservice.certification.exceptions.CsrDecryptionException;
+import org.onap.aaf.certservice.certification.exceptions.DecryptionException;
+import org.onap.aaf.certservice.certification.exceptions.PemDecryptionException;
 
 import java.io.IOException;
 
@@ -44,7 +46,7 @@ class CsrModelTest {
 
 
     @Test
-    void shouldByConstructedAndReturnProperFields() throws CsrDecryptionException, IOException {
+    void shouldByConstructedAndReturnProperFields() throws DecryptionException, IOException {
         // given
         PemObject testPublicKey = generateTestPublicKey();
 
@@ -68,7 +70,7 @@ class CsrModelTest {
     }
 
     @Test
-    void shouldThrowExceptionWhenKeyIsNotCorrect() throws IOException, CsrDecryptionException {
+    void shouldThrowExceptionWhenKeyIsNotCorrect() throws PemDecryptionException ,IOException {
         // given
         PemObjectFactory pemObjectFactory = new PemObjectFactory();
         PKCS10CertificationRequest testCsr = mock(PKCS10CertificationRequest.class);
@@ -93,7 +95,7 @@ class CsrModelTest {
         assertTrue(actualMessage.contains(expectedMessage));
     }
 
-    private CsrModel generateTestCsrModel() throws CsrDecryptionException, IOException {
+    private CsrModel generateTestCsrModel() throws PemDecryptionException, IOException {
         PemObjectFactory pemObjectFactory = new PemObjectFactory();
         PKCS10CertificationRequest testCsr = new PKCS10CertificationRequest(
                 pemObjectFactory.createPemObject(TEST_CSR).getContent()
@@ -102,7 +104,7 @@ class CsrModelTest {
         return new CsrModel(testCsr, testPrivateKey);
     }
 
-    private PemObject generateTestPublicKey() throws CsrDecryptionException, IOException {
+    private PemObject generateTestPublicKey() throws PemDecryptionException, IOException {
         PemObjectFactory pemObjectFactory = new PemObjectFactory();
         PKCS10CertificationRequest testCsr = new PKCS10CertificationRequest(
                 pemObjectFactory.createPemObject(TEST_CSR).getContent()