Github user alopresto commented on a diff in the pull request:
https://github.com/apache/nifi/pull/201#discussion_r51632097
--- Diff:
nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/main/java/org/apache/nifi/processors/standard/util/crypto/CipherUtility.java
---
@@ -0,0 +1,271 @@
+/*
+ * 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.standard.util.crypto;
+
+import org.apache.commons.codec.binary.Base64;
+import org.apache.commons.lang3.StringUtils;
+import org.apache.nifi.processor.exception.ProcessException;
+import org.apache.nifi.stream.io.ByteArrayOutputStream;
+import org.apache.nifi.stream.io.StreamUtils;
+
+import javax.crypto.Cipher;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+public class CipherUtility {
+
+ public static final int BUFFER_SIZE = 65536;
+
+ /**
+ * Returns the cipher algorithm from the full algorithm name. Useful
for getting key lengths, etc.
+ * <p/>
+ * Ex: PBEWITHMD5AND128BITAES-CBC-OPENSSL -> AES
+ *
+ * @param algorithm the full algorithm name
+ * @return the generic cipher name or the full algorithm if one cannot
be extracted
+ */
+ public static String parseCipherFromAlgorithm(final String algorithm) {
+ if (StringUtils.isEmpty(algorithm)) {
+ return algorithm;
+ }
+ String formattedAlgorithm = algorithm.toUpperCase();
+
+ // This is not optimal but the algorithms do not have a standard
format
+ final String AES = "AES";
+ final String TDES = "TRIPLEDES";
+ final String TDES_ALTERNATE = "DESEDE";
+ final String DES = "DES";
+ final String RC4 = "RC4";
+ final String RC2 = "RC2";
+ final String TWOFISH = "TWOFISH";
+ final List<String> SYMMETRIC_CIPHERS = Arrays.asList(AES, TDES,
TDES_ALTERNATE, DES, RC4, RC2, TWOFISH);
+
+ // The algorithms contain "TRIPLEDES" but the cipher name is
"DESede"
+ final String ACTUAL_TDES_CIPHER = "DESede";
+
+ for (String cipher : SYMMETRIC_CIPHERS) {
+ if (formattedAlgorithm.contains(cipher)) {
+ if (cipher.equals(TDES) || cipher.equals(TDES_ALTERNATE)) {
+ return ACTUAL_TDES_CIPHER;
+ } else {
+ return cipher;
+ }
+ }
+ }
+
+ return algorithm;
+ }
+
+ /**
+ * Returns the cipher key length from the full algorithm name. Useful
for getting key lengths, etc.
+ * <p/>
+ * Ex: PBEWITHMD5AND128BITAES-CBC-OPENSSL -> 128
+ *
+ * @param algorithm the full algorithm name
+ * @return the key length or -1 if one cannot be extracted
+ */
+ public static int parseKeyLengthFromAlgorithm(final String algorithm) {
+ int keyLength = parseActualKeyLengthFromAlgorithm(algorithm);
+ if (keyLength != -1) {
+ return keyLength;
+ } else {
+ // Key length not explicitly named in algorithm
+ String cipher = parseCipherFromAlgorithm(algorithm);
+ return getDefaultKeyLengthForCipher(cipher);
+ }
+ }
+
+ private static int parseActualKeyLengthFromAlgorithm(final String
algorithm) {
+ Pattern pattern = Pattern.compile("([\\d]+)BIT");
--- End diff --
Will do.
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