gschaer commented on a change in pull request #5078:
URL: https://github.com/apache/nifi/pull/5078#discussion_r659369524



##########
File path: 
nifi-nar-bundles/nifi-azure-bundle/nifi-azure-processors/src/main/java/org/apache/nifi/processors/azure/storage/utils/AzureBlobClientSideEncryptionUtils.java
##########
@@ -0,0 +1,116 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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.
+ */
+package org.apache.nifi.processors.azure.storage.utils;
+
+import com.google.common.base.Strings;
+import com.microsoft.azure.keyvault.cryptography.SymmetricKey;
+import org.apache.commons.codec.DecoderException;
+import org.apache.commons.codec.binary.Hex;
+import org.apache.nifi.components.AllowableValue;
+import org.apache.nifi.components.PropertyDescriptor;
+import org.apache.nifi.components.ValidationContext;
+import org.apache.nifi.components.ValidationResult;
+import org.apache.nifi.expression.ExpressionLanguageScope;
+import org.apache.nifi.processor.util.StandardValidators;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+
+public class AzureBlobClientSideEncryptionUtils {
+    public static final PropertyDescriptor CSE_KEY_TYPE = new 
PropertyDescriptor.Builder()
+            .name("cse-key-type")
+            .displayName("Client-Side Encryption key type")
+            .required(true)
+            .allowableValues(buildCseEncryptionMethodAllowableValues())
+            .defaultValue(AzureBlobClientSideEncryptionMethod.NONE.name())
+            .description("Specifies the key type to use for client-side 
encryption.")
+            .build();
+
+    public static final PropertyDescriptor CSE_KEY_ID = new 
PropertyDescriptor.Builder()
+            .name("cse-key-id")
+            .displayName("Client-Side Encryption key ID")
+            .description("Specifies the ID of the key to use for client-side 
encryption.")
+            
.expressionLanguageSupported(ExpressionLanguageScope.FLOWFILE_ATTRIBUTES)
+            .required(false)
+            .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
+            .build();
+
+    public static final PropertyDescriptor CSE_SYMMETRIC_KEY_HEX = new 
PropertyDescriptor.Builder()
+            .name("cse-symmetric-key-hex")
+            .displayName("Symmetric Key (hexadecimal)")

Review comment:
       Fixed in b15cfdc

##########
File path: 
nifi-nar-bundles/nifi-azure-bundle/nifi-azure-processors/src/test/java/org/apache/nifi/processors/azure/storage/ITListAzureBlobStorage.java
##########
@@ -20,11 +20,18 @@
 import org.apache.nifi.util.MockFlowFile;
 import org.junit.Before;
 import org.junit.Test;
-
+// import org.junit.runner.RunWith;
+// import org.junit.runners.Parameterized;
 import java.util.concurrent.TimeUnit;
 
+// @RunWith(Parameterized.class)
 public class ITListAzureBlobStorage extends AbstractAzureBlobStorageIT {
 
+    /* @Parameterized.Parameters
+    public static Object[][] data() {
+        return new Object[10][0];
+    }*/
+

Review comment:
       Fixed in b15cfdc

##########
File path: 
nifi-nar-bundles/nifi-azure-bundle/nifi-azure-processors/src/main/java/org/apache/nifi/processors/azure/storage/FetchAzureBlobStorage.java
##########
@@ -112,11 +139,20 @@ public void onTrigger(ProcessContext context, 
ProcessSession session) throws Pro
             final Map<String, String> attributes = new HashMap<>();
             final CloudBlob blob = container.getBlockBlobReference(blobPath);
 
+            BlobRequestOptions blobRequestOptions = new BlobRequestOptions();
+
+            if (cseKeyType == AzureBlobClientSideEncryptionMethod.SYMMETRIC) {
+                byte[] keyBytes = 
Hex.decodeHex(cseSymmetricKeyHex.toCharArray());
+                SymmetricKey key = new SymmetricKey(cseKeyId, keyBytes);
+                BlobEncryptionPolicy policy = new BlobEncryptionPolicy(key, 
null);
+                blobRequestOptions.setEncryptionPolicy(policy);
+            }

Review comment:
       Fixed in b15cfdc

##########
File path: 
nifi-nar-bundles/nifi-azure-bundle/nifi-azure-processors/src/main/java/org/apache/nifi/processors/azure/storage/utils/AzureBlobClientSideEncryptionMethod.java
##########
@@ -0,0 +1,48 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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.
+ */
+package org.apache.nifi.processors.azure.storage.utils;
+
+/**
+ * Enumeration capturing essential information about the various client-side
+ * encryption methods supported by Azure
+ */
+public enum AzureBlobClientSideEncryptionMethod {
+
+    NONE("None", "The blobs sent to Azure is not encrypted."),
+    SYMMETRIC("Symmetric","The blobs sent to Azure are encrypted using a 
symmetric algorithm.");

Review comment:
       Fixed in b15cfdc

##########
File path: 
nifi-nar-bundles/nifi-azure-bundle/nifi-azure-processors/src/main/java/org/apache/nifi/processors/azure/storage/utils/AzureBlobClientSideEncryptionUtils.java
##########
@@ -0,0 +1,116 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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.
+ */
+package org.apache.nifi.processors.azure.storage.utils;
+
+import com.google.common.base.Strings;
+import com.microsoft.azure.keyvault.cryptography.SymmetricKey;
+import org.apache.commons.codec.DecoderException;
+import org.apache.commons.codec.binary.Hex;
+import org.apache.nifi.components.AllowableValue;
+import org.apache.nifi.components.PropertyDescriptor;
+import org.apache.nifi.components.ValidationContext;
+import org.apache.nifi.components.ValidationResult;
+import org.apache.nifi.expression.ExpressionLanguageScope;
+import org.apache.nifi.processor.util.StandardValidators;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+
+public class AzureBlobClientSideEncryptionUtils {
+    public static final PropertyDescriptor CSE_KEY_TYPE = new 
PropertyDescriptor.Builder()
+            .name("cse-key-type")
+            .displayName("Client-Side Encryption key type")

Review comment:
       Fixed in b15cfdc

##########
File path: 
nifi-nar-bundles/nifi-azure-bundle/nifi-azure-processors/src/main/java/org/apache/nifi/processors/azure/storage/utils/AzureBlobClientSideEncryptionUtils.java
##########
@@ -0,0 +1,116 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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.
+ */
+package org.apache.nifi.processors.azure.storage.utils;
+
+import com.google.common.base.Strings;
+import com.microsoft.azure.keyvault.cryptography.SymmetricKey;
+import org.apache.commons.codec.DecoderException;
+import org.apache.commons.codec.binary.Hex;
+import org.apache.nifi.components.AllowableValue;
+import org.apache.nifi.components.PropertyDescriptor;
+import org.apache.nifi.components.ValidationContext;
+import org.apache.nifi.components.ValidationResult;
+import org.apache.nifi.expression.ExpressionLanguageScope;
+import org.apache.nifi.processor.util.StandardValidators;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+
+public class AzureBlobClientSideEncryptionUtils {
+    public static final PropertyDescriptor CSE_KEY_TYPE = new 
PropertyDescriptor.Builder()
+            .name("cse-key-type")
+            .displayName("Client-Side Encryption key type")
+            .required(true)
+            .allowableValues(buildCseEncryptionMethodAllowableValues())
+            .defaultValue(AzureBlobClientSideEncryptionMethod.NONE.name())
+            .description("Specifies the key type to use for client-side 
encryption.")
+            .build();
+
+    public static final PropertyDescriptor CSE_KEY_ID = new 
PropertyDescriptor.Builder()
+            .name("cse-key-id")
+            .displayName("Client-Side Encryption key ID")

Review comment:
       Fixed in b15cfdc

##########
File path: 
nifi-nar-bundles/nifi-azure-bundle/nifi-azure-processors/src/main/java/org/apache/nifi/processors/azure/storage/utils/AzureBlobClientSideEncryptionUtils.java
##########
@@ -0,0 +1,116 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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.
+ */
+package org.apache.nifi.processors.azure.storage.utils;
+
+import com.google.common.base.Strings;
+import com.microsoft.azure.keyvault.cryptography.SymmetricKey;
+import org.apache.commons.codec.DecoderException;
+import org.apache.commons.codec.binary.Hex;
+import org.apache.nifi.components.AllowableValue;
+import org.apache.nifi.components.PropertyDescriptor;
+import org.apache.nifi.components.ValidationContext;
+import org.apache.nifi.components.ValidationResult;
+import org.apache.nifi.expression.ExpressionLanguageScope;
+import org.apache.nifi.processor.util.StandardValidators;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+
+public class AzureBlobClientSideEncryptionUtils {
+    public static final PropertyDescriptor CSE_KEY_TYPE = new 
PropertyDescriptor.Builder()
+            .name("cse-key-type")
+            .displayName("Client-Side Encryption key type")
+            .required(true)
+            .allowableValues(buildCseEncryptionMethodAllowableValues())
+            .defaultValue(AzureBlobClientSideEncryptionMethod.NONE.name())
+            .description("Specifies the key type to use for client-side 
encryption.")
+            .build();
+
+    public static final PropertyDescriptor CSE_KEY_ID = new 
PropertyDescriptor.Builder()
+            .name("cse-key-id")
+            .displayName("Client-Side Encryption key ID")
+            .description("Specifies the ID of the key to use for client-side 
encryption.")
+            
.expressionLanguageSupported(ExpressionLanguageScope.FLOWFILE_ATTRIBUTES)
+            .required(false)
+            .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
+            .build();
+
+    public static final PropertyDescriptor CSE_SYMMETRIC_KEY_HEX = new 
PropertyDescriptor.Builder()
+            .name("cse-symmetric-key-hex")
+            .displayName("Symmetric Key (hexadecimal)")
+            .description("When using symmetric client-side encryption, this is 
the raw key, encoded in hexadecimal")
+            .required(false)
+            .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)

Review comment:
       Fixed in b15cfdc

##########
File path: 
nifi-nar-bundles/nifi-azure-bundle/nifi-azure-processors/src/main/java/org/apache/nifi/processors/azure/storage/utils/AzureBlobClientSideEncryptionUtils.java
##########
@@ -0,0 +1,116 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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.
+ */
+package org.apache.nifi.processors.azure.storage.utils;
+
+import com.google.common.base.Strings;
+import com.microsoft.azure.keyvault.cryptography.SymmetricKey;
+import org.apache.commons.codec.DecoderException;
+import org.apache.commons.codec.binary.Hex;
+import org.apache.nifi.components.AllowableValue;
+import org.apache.nifi.components.PropertyDescriptor;
+import org.apache.nifi.components.ValidationContext;
+import org.apache.nifi.components.ValidationResult;
+import org.apache.nifi.expression.ExpressionLanguageScope;
+import org.apache.nifi.processor.util.StandardValidators;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+
+public class AzureBlobClientSideEncryptionUtils {
+    public static final PropertyDescriptor CSE_KEY_TYPE = new 
PropertyDescriptor.Builder()
+            .name("cse-key-type")
+            .displayName("Client-Side Encryption key type")
+            .required(true)
+            .allowableValues(buildCseEncryptionMethodAllowableValues())
+            .defaultValue(AzureBlobClientSideEncryptionMethod.NONE.name())
+            .description("Specifies the key type to use for client-side 
encryption.")
+            .build();
+
+    public static final PropertyDescriptor CSE_KEY_ID = new 
PropertyDescriptor.Builder()
+            .name("cse-key-id")
+            .displayName("Client-Side Encryption key ID")
+            .description("Specifies the ID of the key to use for client-side 
encryption.")
+            
.expressionLanguageSupported(ExpressionLanguageScope.FLOWFILE_ATTRIBUTES)
+            .required(false)
+            .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
+            .build();
+
+    public static final PropertyDescriptor CSE_SYMMETRIC_KEY_HEX = new 
PropertyDescriptor.Builder()
+            .name("cse-symmetric-key-hex")
+            .displayName("Symmetric Key (hexadecimal)")
+            .description("When using symmetric client-side encryption, this is 
the raw key, encoded in hexadecimal")
+            .required(false)
+            .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
+            .sensitive(true)
+            .build();
+
+    private static AllowableValue[] buildCseEncryptionMethodAllowableValues() {
+        final AzureBlobClientSideEncryptionMethod[] encryptionMethods = 
AzureBlobClientSideEncryptionMethod.values();
+        List<AllowableValue> allowableValues = new 
ArrayList<>(encryptionMethods.length);
+        for (AzureBlobClientSideEncryptionMethod em : encryptionMethods) {
+            allowableValues.add(new AllowableValue(em.name(), em.name(), 
em.toString()));
+        }
+
+        return allowableValues.toArray(new AllowableValue[0]);
+    }
+
+    public static Collection<ValidationResult> 
validateClientSideEncryptionProperties(ValidationContext validationContext) {
+        final List<ValidationResult> validationResults = new ArrayList<>();
+
+        final String cseKeyTypeValue = 
validationContext.getProperty(CSE_KEY_TYPE).getValue();
+        final AzureBlobClientSideEncryptionMethod cseKeyType = 
AzureBlobClientSideEncryptionMethod.valueOf(cseKeyTypeValue);
+
+        final String cseKeyId = 
validationContext.getProperty(CSE_KEY_ID).getValue();
+
+        final String cseSymmetricKeyHex = 
validationContext.getProperty(CSE_SYMMETRIC_KEY_HEX).getValue();
+
+        if (cseKeyType != AzureBlobClientSideEncryptionMethod.NONE && 
Strings.isNullOrEmpty(cseKeyId)) {

Review comment:
       Fixed in b15cfdc

##########
File path: 
nifi-nar-bundles/nifi-azure-bundle/nifi-azure-processors/src/main/java/org/apache/nifi/processors/azure/storage/utils/AzureBlobClientSideEncryptionUtils.java
##########
@@ -0,0 +1,116 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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.
+ */
+package org.apache.nifi.processors.azure.storage.utils;
+
+import com.google.common.base.Strings;
+import com.microsoft.azure.keyvault.cryptography.SymmetricKey;
+import org.apache.commons.codec.DecoderException;
+import org.apache.commons.codec.binary.Hex;
+import org.apache.nifi.components.AllowableValue;
+import org.apache.nifi.components.PropertyDescriptor;
+import org.apache.nifi.components.ValidationContext;
+import org.apache.nifi.components.ValidationResult;
+import org.apache.nifi.expression.ExpressionLanguageScope;
+import org.apache.nifi.processor.util.StandardValidators;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+
+public class AzureBlobClientSideEncryptionUtils {
+    public static final PropertyDescriptor CSE_KEY_TYPE = new 
PropertyDescriptor.Builder()
+            .name("cse-key-type")
+            .displayName("Client-Side Encryption key type")
+            .required(true)
+            .allowableValues(buildCseEncryptionMethodAllowableValues())
+            .defaultValue(AzureBlobClientSideEncryptionMethod.NONE.name())
+            .description("Specifies the key type to use for client-side 
encryption.")
+            .build();
+
+    public static final PropertyDescriptor CSE_KEY_ID = new 
PropertyDescriptor.Builder()
+            .name("cse-key-id")
+            .displayName("Client-Side Encryption key ID")
+            .description("Specifies the ID of the key to use for client-side 
encryption.")
+            
.expressionLanguageSupported(ExpressionLanguageScope.FLOWFILE_ATTRIBUTES)
+            .required(false)
+            .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
+            .build();
+
+    public static final PropertyDescriptor CSE_SYMMETRIC_KEY_HEX = new 
PropertyDescriptor.Builder()
+            .name("cse-symmetric-key-hex")
+            .displayName("Symmetric Key (hexadecimal)")
+            .description("When using symmetric client-side encryption, this is 
the raw key, encoded in hexadecimal")
+            .required(false)
+            .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
+            .sensitive(true)
+            .build();
+
+    private static AllowableValue[] buildCseEncryptionMethodAllowableValues() {
+        final AzureBlobClientSideEncryptionMethod[] encryptionMethods = 
AzureBlobClientSideEncryptionMethod.values();
+        List<AllowableValue> allowableValues = new 
ArrayList<>(encryptionMethods.length);
+        for (AzureBlobClientSideEncryptionMethod em : encryptionMethods) {
+            allowableValues.add(new AllowableValue(em.name(), em.name(), 
em.toString()));
+        }
+
+        return allowableValues.toArray(new AllowableValue[0]);
+    }
+
+    public static Collection<ValidationResult> 
validateClientSideEncryptionProperties(ValidationContext validationContext) {
+        final List<ValidationResult> validationResults = new ArrayList<>();
+
+        final String cseKeyTypeValue = 
validationContext.getProperty(CSE_KEY_TYPE).getValue();
+        final AzureBlobClientSideEncryptionMethod cseKeyType = 
AzureBlobClientSideEncryptionMethod.valueOf(cseKeyTypeValue);
+
+        final String cseKeyId = 
validationContext.getProperty(CSE_KEY_ID).getValue();
+
+        final String cseSymmetricKeyHex = 
validationContext.getProperty(CSE_SYMMETRIC_KEY_HEX).getValue();
+
+        if (cseKeyType != AzureBlobClientSideEncryptionMethod.NONE && 
Strings.isNullOrEmpty(cseKeyId)) {
+            validationResults.add(new 
ValidationResult.Builder().subject(CSE_KEY_ID.getDisplayName())
+                    .explanation("a key ID must be set when client-side 
encryption is enabled.").build());
+        }
+
+        if (cseKeyType == AzureBlobClientSideEncryptionMethod.SYMMETRIC) {
+            validationResults.addAll(validateSymmetricKey(cseSymmetricKeyHex));
+        }
+
+        return validationResults;
+    }
+
+    private static List<ValidationResult> validateSymmetricKey(String keyHex) {
+        List<ValidationResult> validationResults = new ArrayList<>();
+        if (Strings.isNullOrEmpty(keyHex)) {

Review comment:
       Fixed in b15cfdc

##########
File path: 
nifi-nar-bundles/nifi-azure-bundle/nifi-azure-processors/src/main/java/org/apache/nifi/processors/azure/storage/utils/AzureBlobClientSideEncryptionUtils.java
##########
@@ -0,0 +1,116 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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.
+ */
+package org.apache.nifi.processors.azure.storage.utils;
+
+import com.google.common.base.Strings;
+import com.microsoft.azure.keyvault.cryptography.SymmetricKey;
+import org.apache.commons.codec.DecoderException;
+import org.apache.commons.codec.binary.Hex;
+import org.apache.nifi.components.AllowableValue;
+import org.apache.nifi.components.PropertyDescriptor;
+import org.apache.nifi.components.ValidationContext;
+import org.apache.nifi.components.ValidationResult;
+import org.apache.nifi.expression.ExpressionLanguageScope;
+import org.apache.nifi.processor.util.StandardValidators;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+
+public class AzureBlobClientSideEncryptionUtils {
+    public static final PropertyDescriptor CSE_KEY_TYPE = new 
PropertyDescriptor.Builder()
+            .name("cse-key-type")
+            .displayName("Client-Side Encryption key type")
+            .required(true)
+            .allowableValues(buildCseEncryptionMethodAllowableValues())
+            .defaultValue(AzureBlobClientSideEncryptionMethod.NONE.name())
+            .description("Specifies the key type to use for client-side 
encryption.")
+            .build();
+
+    public static final PropertyDescriptor CSE_KEY_ID = new 
PropertyDescriptor.Builder()
+            .name("cse-key-id")
+            .displayName("Client-Side Encryption key ID")
+            .description("Specifies the ID of the key to use for client-side 
encryption.")
+            
.expressionLanguageSupported(ExpressionLanguageScope.FLOWFILE_ATTRIBUTES)
+            .required(false)
+            .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
+            .build();
+
+    public static final PropertyDescriptor CSE_SYMMETRIC_KEY_HEX = new 
PropertyDescriptor.Builder()
+            .name("cse-symmetric-key-hex")
+            .displayName("Symmetric Key (hexadecimal)")
+            .description("When using symmetric client-side encryption, this is 
the raw key, encoded in hexadecimal")
+            .required(false)
+            .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
+            .sensitive(true)
+            .build();
+
+    private static AllowableValue[] buildCseEncryptionMethodAllowableValues() {
+        final AzureBlobClientSideEncryptionMethod[] encryptionMethods = 
AzureBlobClientSideEncryptionMethod.values();
+        List<AllowableValue> allowableValues = new 
ArrayList<>(encryptionMethods.length);
+        for (AzureBlobClientSideEncryptionMethod em : encryptionMethods) {
+            allowableValues.add(new AllowableValue(em.name(), em.name(), 
em.toString()));
+        }
+
+        return allowableValues.toArray(new AllowableValue[0]);
+    }
+
+    public static Collection<ValidationResult> 
validateClientSideEncryptionProperties(ValidationContext validationContext) {
+        final List<ValidationResult> validationResults = new ArrayList<>();
+
+        final String cseKeyTypeValue = 
validationContext.getProperty(CSE_KEY_TYPE).getValue();
+        final AzureBlobClientSideEncryptionMethod cseKeyType = 
AzureBlobClientSideEncryptionMethod.valueOf(cseKeyTypeValue);
+
+        final String cseKeyId = 
validationContext.getProperty(CSE_KEY_ID).getValue();
+
+        final String cseSymmetricKeyHex = 
validationContext.getProperty(CSE_SYMMETRIC_KEY_HEX).getValue();
+
+        if (cseKeyType != AzureBlobClientSideEncryptionMethod.NONE && 
Strings.isNullOrEmpty(cseKeyId)) {
+            validationResults.add(new 
ValidationResult.Builder().subject(CSE_KEY_ID.getDisplayName())
+                    .explanation("a key ID must be set when client-side 
encryption is enabled.").build());
+        }
+
+        if (cseKeyType == AzureBlobClientSideEncryptionMethod.SYMMETRIC) {
+            validationResults.addAll(validateSymmetricKey(cseSymmetricKeyHex));
+        }
+
+        return validationResults;
+    }
+
+    private static List<ValidationResult> validateSymmetricKey(String keyHex) {
+        List<ValidationResult> validationResults = new ArrayList<>();

Review comment:
       Fixed in b15cfdc




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