1 files changed, 52 insertions, 0 deletions
diff --git a/csarvalidation/src/main/java/org/onap/cvc/csar/cc/sol004/r130206/FileHashValidator.java b/csarvalidation/src/main/java/org/onap/cvc/csar/cc/sol004/r130206/FileHashValidator.java
new file mode 100644
index 0000000..f1412d7
--- /dev/null
+++ b/csarvalidation/src/main/java/org/onap/cvc/csar/cc/sol004/r130206/FileHashValidator.java
@@ -0,0 +1,52 @@
+/*
+  Copyright 2020 Nokia
+  <p>
+  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
+  <p>
+  http://www.apache.org/licenses/LICENSE-2.0
+  <p>
+  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.
+ */
+
+package org.onap.cvc.csar.cc.sol004.r130206;
+
+import org.onap.cvc.csar.security.ShaHashCodeGenerator;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.security.NoSuchAlgorithmException;
+
+public class FileHashValidator {
+
+    private static final String SHA_256 = "SHA-256";
+    private static final String SHA_512 = "SHA-512";
+
+    private final ShaHashCodeGenerator shaHashCodeGenerator = new ShaHashCodeGenerator();
+
+    public boolean isValid(String expectedHash, Path fileToCheck, String algorithm)
+        throws NoSuchAlgorithmException, IOException {
+        String hashCode = generateHashCode(fileToCheck, algorithm);
+        return hashCode.equals(expectedHash);
+    }
+
+    private String generateHashCode(Path fileToCheck,  String algorithm)
+        throws NoSuchAlgorithmException, IOException {
+        final byte[] sourceData = Files.readAllBytes(fileToCheck);
+
+        if (algorithm.equalsIgnoreCase(SHA_256)) {
+            return this.shaHashCodeGenerator.generateSha256(sourceData);
+        } else if (algorithm.equalsIgnoreCase(SHA_512)) {
+            return this.shaHashCodeGenerator.generateSha512(sourceData);
+        }
+
+        throw new UnsupportedOperationException(String.format("Algorithm '%s' is not supported!", algorithm));
+    }
+
+}