1 files changed, 100 insertions, 0 deletions
diff --git a/certService/src/main/java/org/onap/oom/certservice/cmpv2client/impl/protections/PasswordBasedProtection.java b/certService/src/main/java/org/onap/oom/certservice/cmpv2client/impl/protections/PasswordBasedProtection.java
new file mode 100644
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--- /dev/null
+++ b/certService/src/main/java/org/onap/oom/certservice/cmpv2client/impl/protections/PasswordBasedProtection.java
@@ -0,0 +1,100 @@
+/*-
+ * ============LICENSE_START=======================================================
+ *  Copyright (C) 2021 Nokia.
+ * ================================================================================
+ * 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.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ * ============LICENSE_END=========================================================
+ */
+
+package org.onap.oom.certservice.cmpv2client.impl.protections;
+
+import org.bouncycastle.asn1.ASN1Integer;
+import org.bouncycastle.asn1.ASN1ObjectIdentifier;
+import org.bouncycastle.asn1.DEROctetString;
+import org.bouncycastle.asn1.cmp.PBMParameter;
+import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
+import org.bouncycastle.jce.provider.BouncyCastleProvider;
+
+import javax.crypto.Mac;
+import javax.crypto.SecretKey;
+import javax.crypto.spec.SecretKeySpec;
+import java.security.GeneralSecurityException;
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+import java.security.NoSuchProviderException;
+
+import static org.onap.oom.certservice.cmpv2client.impl.CmpUtil.createRandomBytes;
+import static org.onap.oom.certservice.cmpv2client.impl.CmpUtil.createRandomInt;
+
+/**
+ * Implementation of password-based PKIMessage protection
+ */
+public class PasswordBasedProtection extends PkiMessageProtection {
+
+    private static final int ITERATIONS = createRandomInt(1000);
+    private static final byte[] SALT = createRandomBytes();
+    private static final AlgorithmIdentifier OWF_ALGORITHM =
+            new AlgorithmIdentifier(new ASN1ObjectIdentifier("1.3.14.3.2.26"));
+    private static final AlgorithmIdentifier MAC_ALGORITHM =
+            new AlgorithmIdentifier(new ASN1ObjectIdentifier("1.3.6.1.5.5.8.1.2"));
+    private static final ASN1ObjectIdentifier PASSWORD_BASED_MAC =
+            new ASN1ObjectIdentifier("1.2.840.113533.7.66.13");
+
+    private final String initAuthPassword;
+
+    public PasswordBasedProtection(String initAuthPassword) {
+        this.initAuthPassword = initAuthPassword;
+    }
+
+    @Override
+    public AlgorithmIdentifier getAlgorithmIdentifier() {
+        ASN1Integer iteration = new ASN1Integer(ITERATIONS);
+        DEROctetString derSalt = new DEROctetString(SALT);
+
+        PBMParameter pp = new PBMParameter(derSalt, OWF_ALGORITHM, iteration, MAC_ALGORITHM);
+        return new AlgorithmIdentifier(PASSWORD_BASED_MAC, pp);
+    }
+
+    @Override
+    byte[] generateProtectionBytes(byte[] protectedBytes) throws GeneralSecurityException {
+        byte[] baseKey = generateBaseKey();
+        return generateMacBytes(baseKey, protectedBytes);
+    }
+
+    private byte[] generateBaseKey() throws NoSuchAlgorithmException, NoSuchProviderException {
+        byte[] raSecret = initAuthPassword.getBytes();
+        byte[] baseKey = new byte[raSecret.length + SALT.length];
+        System.arraycopy(raSecret, 0, baseKey, 0, raSecret.length);
+        System.arraycopy(SALT, 0, baseKey, raSecret.length, SALT.length);
+        MessageDigest dig =
+                MessageDigest.getInstance(
+                        OWF_ALGORITHM.getAlgorithm().getId(), BouncyCastleProvider.PROVIDER_NAME);
+        for (int i = 0; i < ITERATIONS; i++) {
+            baseKey = dig.digest(baseKey);
+            dig.reset();
+        }
+        return baseKey;
+    }
+
+    private byte[] generateMacBytes(byte[] baseKey, byte[] protectedBytes) throws GeneralSecurityException {
+        Mac mac = Mac.getInstance(MAC_ALGORITHM.getAlgorithm().getId(), BouncyCastleProvider.PROVIDER_NAME);
+        SecretKey key = new SecretKeySpec(baseKey, MAC_ALGORITHM.getAlgorithm().getId());
+        mac.init(key);
+        mac.reset();
+        mac.update(protectedBytes, 0, protectedBytes.length);
+        return mac.doFinal();
+    }
+
+}