Github user HandOfGod94 commented on a diff in the pull request:
https://github.com/apache/nifi/pull/1294#discussion_r91831223
--- Diff:
nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/main/java/org/apache/nifi/processors/standard/EncryptAttributes.java
---
@@ -0,0 +1,611 @@
+/*
+ * 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;
+
+import org.apache.commons.codec.DecoderException;
+import org.apache.commons.codec.binary.Base64;
+import org.apache.commons.codec.binary.Hex;
+import org.apache.commons.lang3.StringUtils;
+import org.apache.nifi.annotation.behavior.EventDriven;
+import org.apache.nifi.annotation.behavior.InputRequirement;
+import org.apache.nifi.annotation.behavior.SideEffectFree;
+import org.apache.nifi.annotation.behavior.SupportsBatching;
+import org.apache.nifi.annotation.documentation.CapabilityDescription;
+import org.apache.nifi.annotation.documentation.Tags;
+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.flowfile.FlowFile;
+import org.apache.nifi.flowfile.attributes.CoreAttributes;
+import org.apache.nifi.logging.ComponentLog;
+import org.apache.nifi.processor.AbstractProcessor;
+import org.apache.nifi.processor.ProcessContext;
+import org.apache.nifi.processor.ProcessSession;
+import org.apache.nifi.processor.ProcessorInitializationContext;
+import org.apache.nifi.processor.Relationship;
+import org.apache.nifi.processor.exception.ProcessException;
+import org.apache.nifi.processor.util.StandardValidators;
+import org.apache.nifi.processors.standard.util.crypto.CipherUtility;
+import org.apache.nifi.processors.standard.util.crypto.KeyedEncryptor;
+import
org.apache.nifi.processors.standard.util.crypto.OpenPGPKeyBasedEncryptor;
+import
org.apache.nifi.processors.standard.util.crypto.OpenPGPPasswordBasedEncryptor;
+import
org.apache.nifi.processors.standard.util.crypto.PasswordBasedEncryptor;
+import org.apache.nifi.security.util.EncryptionMethod;
+import org.apache.nifi.security.util.KeyDerivationFunction;
+import org.bouncycastle.jce.provider.BouncyCastleProvider;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.nio.charset.StandardCharsets;
+import java.security.Security;
+import java.text.Normalizer;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+/**
+ * Provides functionality of encrypting attributes with various algorithms.
+ * Note. It'll not modify filename or uuid as they are sensitive and are
+ * internally used by either Algorithm itself or FlowFile repo.
+ */
+@EventDriven
+@SideEffectFree
+@SupportsBatching
+@InputRequirement(InputRequirement.Requirement.INPUT_REQUIRED)
+@Tags({"encryption", "decryption", "password", "JCE", "OpenPGP", "PGP",
"GPG"})
+@CapabilityDescription("Encrypts or Decrypts a FlowFile attributes using
either symmetric encryption with a password " +
+ "and randomly generated salt, or asymmetric encryption using a
public and secret key.")
+public class EncryptAttributes extends AbstractProcessor {
+
+ public static final String ENCRYPT_MODE = "Encrypt";
+ public static final String DECRYPT_MODE = "Decrypt";
+
+ public static final String WEAK_CRYPTO_ALLOWED_NAME = "allowed";
+ public static final String WEAK_CRYPTO_NOT_ALLOWED_NAME =
"not-allowed";
+
+ public static final PropertyDescriptor ATTRIBUTES_TO_ENCRYPT = new
PropertyDescriptor.Builder()
+ .name("Attributes to encrypt")
+ .description("Comma separated list of attributes to encrypt,
if empty then it'll encrypt all the " +
+ "attributes including CoreAttributes EXCEPT filename
and uuid. " +
+ "This list is case sensitive and if attribute is not
found " +
+ "then the value will be ignored. " )
+ .required(false)
+ .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
+ .build();
+ public static final PropertyDescriptor MODE = new
PropertyDescriptor.Builder()
+ .name("Mode")
+ .description("Specifies whether the content should be
encrypted or decrypted")
+ .required(true)
+ .allowableValues(ENCRYPT_MODE, DECRYPT_MODE)
+ .defaultValue(ENCRYPT_MODE)
+ .build();
+ public static final PropertyDescriptor KEY_DERIVATION_FUNCTION = new
PropertyDescriptor.Builder()
+ .name("key-derivation-function")
+ .displayName("Key Derivation Function")
+ .description("Specifies the key derivation function to
generate the key from the password (and salt)")
+ .required(true)
+ .allowableValues(buildKeyDerivationFunctionAllowableValues())
+ .defaultValue(KeyDerivationFunction.BCRYPT.name())
+ .build();
+ public static final PropertyDescriptor ENCRYPTION_ALGORITHM = new
PropertyDescriptor.Builder()
+ .name("Encryption Algorithm")
+ .description("The Encryption Algorithm to use")
+ .required(true)
+ .allowableValues(buildEncryptionMethodAllowableValues())
+ .defaultValue(EncryptionMethod.MD5_128AES.name())
+ .build();
+ public static final PropertyDescriptor PASSWORD = new
PropertyDescriptor.Builder()
+ .name("Password")
+ .description("The Password to use for encrypting or decrypting
the data")
+ .required(false)
+ .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
+ .sensitive(true)
+ .build();
+ public static final PropertyDescriptor PUBLIC_KEYRING = new
PropertyDescriptor.Builder()
+ .name("public-keyring-file")
+ .displayName("Public Keyring File")
+ .description("In a PGP encrypt mode, this keyring contains the
public key of the recipient")
+ .required(false)
+ .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
+ .build();
+ public static final PropertyDescriptor PUBLIC_KEY_USERID = new
PropertyDescriptor.Builder()
+ .name("public-key-user-id")
+ .displayName("Public Key User Id")
+ .description("In a PGP encrypt mode, this user id of the
recipient")
+ .required(false)
+ .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
+ .build();
+ public static final PropertyDescriptor PRIVATE_KEYRING = new
PropertyDescriptor.Builder()
+ .name("private-keyring-file")
+ .displayName("Private Keyring File")
+ .description("In a PGP decrypt mode, this keyring contains the
private key of the recipient")
+ .required(false)
+ .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
+ .build();
+ public static final PropertyDescriptor PRIVATE_KEYRING_PASSPHRASE =
new PropertyDescriptor.Builder()
+ .name("private-keyring-passphrase")
+ .displayName("Private Keyring Passphrase")
+ .description("In a PGP decrypt mode, this is the private
keyring passphrase")
+ .required(false)
+ .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
+ .sensitive(true)
+ .build();
+ public static final PropertyDescriptor RAW_KEY_HEX = new
PropertyDescriptor.Builder()
+ .name("raw-key-hex")
+ .displayName("Raw Key (hexadecimal)")
+ .description("In keyed encryption, this is the raw key,
encoded in hexadecimal")
+ .required(false)
+ .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
+ .sensitive(true)
+ .build();
+ public static final PropertyDescriptor ALLOW_WEAK_CRYPTO = new
PropertyDescriptor.Builder()
+ .name("allow-weak-crypto")
+ .displayName("Allow insecure cryptographic modes")
+ .description("Overrides the default behavior to prevent unsafe
combinations of encryption algorithms and short passwords on JVMs with limited
strength cryptographic jurisdiction policies")
+ .required(true)
+ .allowableValues(buildWeakCryptoAllowableValues())
+
.defaultValue(buildDefaultWeakCryptoAllowableValue().getValue())
+ .build();
+
+ public static final Relationship REL_SUCCESS = new
Relationship.Builder().name("success")
+ .description("Any FlowFile that is successfully encrypted or
decrypted will be routed to success").build();
+
+ public static final Relationship REL_FAILURE = new
Relationship.Builder().name("failure")
+ .description("Any FlowFile that cannot be encrypted or
decrypted will be routed to failure").build();
+ private List<PropertyDescriptor> properties;
+
+ private Set<Relationship> relationships;
+
+ static {
+ // add BouncyCastle encryption providers
+ Security.addProvider(new BouncyCastleProvider());
+ }
+
+ private static AllowableValue[]
buildKeyDerivationFunctionAllowableValues() {
+ final KeyDerivationFunction[] keyDerivationFunctions =
KeyDerivationFunction.values();
+ List<AllowableValue> allowableValues = new
ArrayList<>(keyDerivationFunctions.length);
+ for (KeyDerivationFunction kdf : keyDerivationFunctions) {
+ allowableValues.add(new AllowableValue(kdf.name(),
kdf.getName(), kdf.getDescription()));
+ }
+
+ return allowableValues.toArray(new AllowableValue[0]);
+ }
+
+ private static AllowableValue[] buildEncryptionMethodAllowableValues()
{
+ final EncryptionMethod[] encryptionMethods =
EncryptionMethod.values();
+ List<AllowableValue> allowableValues = new
ArrayList<>(encryptionMethods.length);
+ for (EncryptionMethod em : encryptionMethods) {
+ allowableValues.add(new AllowableValue(em.name(), em.name(),
em.toString()));
+ }
+
+ return allowableValues.toArray(new AllowableValue[0]);
+ }
+
+ private static AllowableValue[] buildWeakCryptoAllowableValues() {
+ List<AllowableValue> allowableValues = new ArrayList<>();
+ allowableValues.add(new AllowableValue(WEAK_CRYPTO_ALLOWED_NAME,
"Allowed", "Operation will not be blocked and no alerts will be presented " +
+ "when unsafe combinations of encryption algorithms and
passwords are provided"));
+ allowableValues.add(buildDefaultWeakCryptoAllowableValue());
+ return allowableValues.toArray(new AllowableValue[0]);
+ }
+
+ private static AllowableValue buildDefaultWeakCryptoAllowableValue() {
+ return new AllowableValue(WEAK_CRYPTO_NOT_ALLOWED_NAME, "Not
Allowed", "When set, operation will be blocked and alerts will be presented to
the user " +
+ "if unsafe combinations of encryption algorithms and
passwords are provided on a JVM with limited strength crypto. To fix this, see
the Admin Guide.");
+ }
+
+ @Override
+ protected void init(final ProcessorInitializationContext context) {
+ final List<PropertyDescriptor> properties = new ArrayList<>();
+ properties.add(ATTRIBUTES_TO_ENCRYPT);
+ properties.add(MODE);
+ properties.add(KEY_DERIVATION_FUNCTION);
+ properties.add(ENCRYPTION_ALGORITHM);
+ properties.add(ALLOW_WEAK_CRYPTO);
+ properties.add(PASSWORD);
+ properties.add(RAW_KEY_HEX);
+ properties.add(PUBLIC_KEYRING);
+ properties.add(PUBLIC_KEY_USERID);
+ properties.add(PRIVATE_KEYRING);
+ properties.add(PRIVATE_KEYRING_PASSPHRASE);
+ this.properties = Collections.unmodifiableList(properties);
+
+ final Set<Relationship> relationships = new HashSet<>();
+ relationships.add(REL_SUCCESS);
+ relationships.add(REL_FAILURE);
+ this.relationships = Collections.unmodifiableSet(relationships);
+ }
+
+ @Override
+ public Set<Relationship> getRelationships() {
+ return relationships;
+ }
+
+ @Override
+ protected List<PropertyDescriptor> getSupportedPropertyDescriptors() {
+ return properties;
+ }
+
+ public static boolean isPGPAlgorithm(final String algorithm) {
+ return algorithm.startsWith("PGP");
+ }
+
+ public static boolean isPGPArmoredAlgorithm(final String algorithm) {
+ return isPGPAlgorithm(algorithm) &&
algorithm.endsWith("ASCII-ARMOR");
+ }
+
+ @Override
+ protected Collection<ValidationResult> customValidate(final
ValidationContext context) {
+ final List<ValidationResult> validationResults = new
ArrayList<>(super.customValidate(context));
+ final String methodValue =
context.getProperty(ENCRYPTION_ALGORITHM).getValue();
+ final EncryptionMethod encryptionMethod =
EncryptionMethod.valueOf(methodValue);
+ final String algorithm = encryptionMethod.getAlgorithm();
+ final String password = context.getProperty(PASSWORD).getValue();
+ final KeyDerivationFunction kdf =
KeyDerivationFunction.valueOf(context.getProperty(KEY_DERIVATION_FUNCTION).getValue());
+ final String keyHex = context.getProperty(RAW_KEY_HEX).getValue();
+ if (isPGPAlgorithm(algorithm)) {
+ final boolean encrypt =
context.getProperty(MODE).getValue().equalsIgnoreCase(ENCRYPT_MODE);
+ final String publicKeyring =
context.getProperty(PUBLIC_KEYRING).getValue();
+ final String publicUserId =
context.getProperty(PUBLIC_KEY_USERID).getValue();
+ final String privateKeyring =
context.getProperty(PRIVATE_KEYRING).getValue();
+ final String privateKeyringPassphrase =
context.getProperty(PRIVATE_KEYRING_PASSPHRASE).getValue();
+ validationResults.addAll(validatePGP(encryptionMethod,
password, encrypt, publicKeyring, publicUserId, privateKeyring,
privateKeyringPassphrase));
+ } else { // Not PGP
+ if (encryptionMethod.isKeyedCipher()) { // Raw key
+ validationResults.addAll(validateKeyed(encryptionMethod,
kdf, keyHex));
+ } else { // PBE
+ boolean allowWeakCrypto =
context.getProperty(ALLOW_WEAK_CRYPTO).getValue().equalsIgnoreCase(WEAK_CRYPTO_ALLOWED_NAME);
+ validationResults.addAll(validatePBE(encryptionMethod,
kdf, password, allowWeakCrypto));
+ }
+ }
+ return validationResults;
+ }
+
+ private List<ValidationResult> validatePGP(EncryptionMethod
encryptionMethod, String password, boolean encrypt, String publicKeyring,
String publicUserId, String privateKeyring,
+ String
privateKeyringPassphrase) {
+ List<ValidationResult> validationResults = new ArrayList<>();
+
+ if (password == null) {
+ if (encrypt) {
+ // If encrypting without a password, require both
public-keyring-file and public-key-user-id
+ if (publicKeyring == null || publicUserId == null) {
+ validationResults.add(new
ValidationResult.Builder().subject(PUBLIC_KEYRING.getDisplayName())
+ .explanation(encryptionMethod.getAlgorithm() +
" encryption without a " + PASSWORD.getDisplayName() + " requires both "
+ + PUBLIC_KEYRING.getDisplayName() + "
and " + PUBLIC_KEY_USERID.getDisplayName())
+ .build());
+ } else {
+ // Verify the public keyring contains the user id
+ try {
+ if
(OpenPGPKeyBasedEncryptor.getPublicKey(publicUserId, publicKeyring) == null) {
+ validationResults.add(new
ValidationResult.Builder().subject(PUBLIC_KEYRING.getDisplayName())
+
.explanation(PUBLIC_KEYRING.getDisplayName() + " " + publicKeyring
+ + " does not contain user id "
+ publicUserId)
+ .build());
+ }
+ } catch (final Exception e) {
+ validationResults.add(new
ValidationResult.Builder().subject(PUBLIC_KEYRING.getDisplayName())
+ .explanation("Invalid " +
PUBLIC_KEYRING.getDisplayName() + " " + publicKeyring
+ + " because " + e.toString())
+ .build());
+ }
+ }
+ } else { // Decrypt
+ // Require both private-keyring-file and
private-keyring-passphrase
+ if (privateKeyring == null || privateKeyringPassphrase ==
null) {
+ validationResults.add(new
ValidationResult.Builder().subject(PRIVATE_KEYRING.getName())
+ .explanation(encryptionMethod.getAlgorithm() +
" decryption without a " + PASSWORD.getDisplayName() + " requires both "
+ + PRIVATE_KEYRING.getDisplayName() + "
and " + PRIVATE_KEYRING_PASSPHRASE.getDisplayName())
+ .build());
+ } else {
+ final String providerName =
encryptionMethod.getProvider();
+ // Verify the passphrase works on the private keyring
+ try {
+ if
(!OpenPGPKeyBasedEncryptor.validateKeyring(providerName, privateKeyring,
privateKeyringPassphrase.toCharArray())) {
+ validationResults.add(new
ValidationResult.Builder().subject(PRIVATE_KEYRING.getDisplayName())
+
.explanation(PRIVATE_KEYRING.getDisplayName() + " " + privateKeyring
+ + " could not be opened with
the provided " + PRIVATE_KEYRING_PASSPHRASE.getDisplayName())
+ .build());
+ }
+ } catch (final Exception e) {
+ validationResults.add(new
ValidationResult.Builder().subject(PRIVATE_KEYRING.getDisplayName())
+ .explanation("Invalid " +
PRIVATE_KEYRING.getDisplayName() + " " + privateKeyring
+ + " because " + e.toString())
+ .build());
+ }
+ }
+ }
+ }
+
+ return validationResults;
+ }
+
+ private List<ValidationResult> validatePBE(EncryptionMethod
encryptionMethod, KeyDerivationFunction kdf, String password, boolean
allowWeakCrypto) {
+ List<ValidationResult> validationResults = new ArrayList<>();
+ boolean limitedStrengthCrypto =
!PasswordBasedEncryptor.supportsUnlimitedStrength();
+
+ // Password required (short circuits validation because other
conditions depend on password presence)
+ if (StringUtils.isEmpty(password)) {
+ validationResults.add(new
ValidationResult.Builder().subject(PASSWORD.getName())
+ .explanation(PASSWORD.getDisplayName() + " is required
when using algorithm " + encryptionMethod.getAlgorithm()).build());
+ return validationResults;
+ }
+
+ // If weak crypto is not explicitly allowed via override, check
the password length and algorithm
+ final int passwordBytesLength =
password.getBytes(StandardCharsets.UTF_8).length;
+ if (!allowWeakCrypto) {
+ final int minimumSafePasswordLength =
PasswordBasedEncryptor.getMinimumSafePasswordLength();
+ if (passwordBytesLength < minimumSafePasswordLength) {
+ validationResults.add(new
ValidationResult.Builder().subject(PASSWORD.getName())
+ .explanation("Password length less than " +
minimumSafePasswordLength + " characters is potentially unsafe. See Admin
Guide.").build());
+ }
+ }
+
+ // Multiple checks on machine with limited strength crypto
+ if (limitedStrengthCrypto) {
+ // Cannot use unlimited strength ciphers on machine that lacks
policies
+ if (encryptionMethod.isUnlimitedStrength()) {
+ validationResults.add(new
ValidationResult.Builder().subject(ENCRYPTION_ALGORITHM.getName())
+ .explanation(encryptionMethod.name() + " (" +
encryptionMethod.getAlgorithm() + ") is not supported by this JVM due to
lacking JCE Unlimited " +
+ "Strength Jurisdiction Policy files. See
Admin Guide.").build());
+ }
+
+ // Check if the password exceeds the limit
+ final boolean passwordLongerThanLimit =
!CipherUtility.passwordLengthIsValidForAlgorithmOnLimitedStrengthCrypto(passwordBytesLength,
encryptionMethod);
+ if (passwordLongerThanLimit) {
+ int maxPasswordLength =
CipherUtility.getMaximumPasswordLengthForAlgorithmOnLimitedStrengthCrypto(encryptionMethod);
+ validationResults.add(new
ValidationResult.Builder().subject(PASSWORD.getName())
+ .explanation("Password length greater than " +
maxPasswordLength + " characters is not supported by this JVM" +
+ " due to lacking JCE Unlimited Strength
Jurisdiction Policy files. See Admin Guide.").build());
+ }
+ }
+
+ // Check the KDF for compatibility with this algorithm
+ List<String> kdfsForPBECipher =
getKDFsForPBECipher(encryptionMethod);
+ if (kdf == null || !kdfsForPBECipher.contains(kdf.name())) {
+ final String displayName =
KEY_DERIVATION_FUNCTION.getDisplayName();
+ validationResults.add(new
ValidationResult.Builder().subject(displayName)
+ .explanation(displayName + " is required to be " +
StringUtils.join(kdfsForPBECipher,
+ ", ") + " when using algorithm " +
encryptionMethod.getAlgorithm() + ". See Admin Guide.").build());
+ }
+
+ return validationResults;
+ }
+
+ private List<ValidationResult> validateKeyed(EncryptionMethod
encryptionMethod, KeyDerivationFunction kdf, String keyHex) {
+ List<ValidationResult> validationResults = new ArrayList<>();
+ boolean limitedStrengthCrypto =
!PasswordBasedEncryptor.supportsUnlimitedStrength();
+
+ if (limitedStrengthCrypto) {
+ if (encryptionMethod.isUnlimitedStrength()) {
+ validationResults.add(new
ValidationResult.Builder().subject(ENCRYPTION_ALGORITHM.getName())
+ .explanation(encryptionMethod.name() + " (" +
encryptionMethod.getAlgorithm() + ") is not supported by this JVM due to
lacking JCE Unlimited " +
+ "Strength Jurisdiction Policy files. See
Admin Guide.").build());
+ }
+ }
+ int allowedKeyLength =
PasswordBasedEncryptor.getMaxAllowedKeyLength(ENCRYPTION_ALGORITHM.getName());
+
+ if (StringUtils.isEmpty(keyHex)) {
+ validationResults.add(new
ValidationResult.Builder().subject(RAW_KEY_HEX.getName())
+ .explanation(RAW_KEY_HEX.getDisplayName() + " is
required when using algorithm " + encryptionMethod.getAlgorithm() + ". See
Admin Guide.").build());
+ } else {
+ byte[] keyBytes = new byte[0];
+ try {
+ keyBytes = Hex.decodeHex(keyHex.toCharArray());
+ } catch (DecoderException e) {
+ validationResults.add(new
ValidationResult.Builder().subject(RAW_KEY_HEX.getName())
+ .explanation("Key must be valid hexadecimal
string. See Admin Guide.").build());
+ }
+ if (keyBytes.length * 8 > allowedKeyLength) {
+ validationResults.add(new
ValidationResult.Builder().subject(RAW_KEY_HEX.getName())
+ .explanation("Key length greater than " +
allowedKeyLength + " bits is not supported by this JVM" +
+ " due to lacking JCE Unlimited Strength
Jurisdiction Policy files. See Admin Guide.").build());
+ }
+ if
(!CipherUtility.isValidKeyLengthForAlgorithm(keyBytes.length * 8,
encryptionMethod.getAlgorithm())) {
+ List<Integer> validKeyLengths =
CipherUtility.getValidKeyLengthsForAlgorithm(encryptionMethod.getAlgorithm());
+ validationResults.add(new
ValidationResult.Builder().subject(RAW_KEY_HEX.getName())
+ .explanation("Key must be valid length [" +
StringUtils.join(validKeyLengths, ", ") + "]. See Admin Guide.").build());
+ }
+ }
+
+ // Perform some analysis on the selected encryption algorithm to
ensure the JVM can support it and the associated key
+
+ List<String> kdfsForKeyedCipher = getKDFsForKeyedCipher();
+ if (kdf == null || !kdfsForKeyedCipher.contains(kdf.name())) {
+ validationResults.add(new
ValidationResult.Builder().subject(KEY_DERIVATION_FUNCTION.getName())
+ .explanation(KEY_DERIVATION_FUNCTION.getDisplayName()
+ " is required to be " + StringUtils.join(kdfsForKeyedCipher, ", ") + " when
using algorithm " +
+ encryptionMethod.getAlgorithm()).build());
+ }
+
+ return validationResults;
+ }
+
+ private List<String> getKDFsForKeyedCipher() {
+ List<String> kdfsForKeyedCipher = new ArrayList<>();
+ kdfsForKeyedCipher.add(KeyDerivationFunction.NONE.name());
+ for (KeyDerivationFunction k : KeyDerivationFunction.values()) {
+ if (k.isStrongKDF()) {
+ kdfsForKeyedCipher.add(k.name());
+ }
+ }
+ return kdfsForKeyedCipher;
+ }
+
+ private List<String> getKDFsForPBECipher(EncryptionMethod
encryptionMethod) {
+ List<String> kdfsForPBECipher = new ArrayList<>();
+ for (KeyDerivationFunction k : KeyDerivationFunction.values()) {
+ // Add all weak (legacy) KDFs except NONE
+ if (!k.isStrongKDF() && !k.equals(KeyDerivationFunction.NONE))
{
+ kdfsForPBECipher.add(k.name());
+ // If this algorithm supports strong KDFs, add them as well
+ } else if ((encryptionMethod.isCompatibleWithStrongKDFs() &&
k.isStrongKDF())) {
+ kdfsForPBECipher.add(k.name());
+ }
+ }
+ return kdfsForPBECipher;
+ }
+
+ private Map<String, String> buildNewAttributes(FlowFile file, String
atrList,
+
EncryptContent.Encryptor encryptor,
+ boolean
isToBeEncrypted) throws Exception {
+
+ Map<String, String> oldAttributes = file.getAttributes();
+ Map<String, String> atrToWrite = new HashMap<>();
+ final String filenameAttr = CoreAttributes.FILENAME.key();
+ final String uuidAttr = CoreAttributes.UUID.key();
+
+ if (!StringUtils.isEmpty(atrList)) {
+ //TODO: check for spaces also
+ // Traverse comma separated list if provided
+ String[] attrs = atrList.split(",");
+ Set<String> atrSet = new HashSet<>(Arrays.asList(attrs));
+ for (String atr : atrSet) {
+ if (oldAttributes.containsKey(atr) &&
!atr.equals(filenameAttr) && !atr.equals(uuidAttr)) {
+ String atrValue = oldAttributes.get(atr);
+ String newAtrVal = (isToBeEncrypted) ?
EncryptString.performEncryption(atrValue, encryptor) :
EncryptString.performDecryption(atrValue, encryptor);
+ atrToWrite.put(atr, newAtrVal);
+ }
+ }
+ } else {
+ //TODO: filename encryption check only for PGP algos.
--- End diff --
`filename` will be used in PGP algo so shouldn't be used for encryption or
decryption only for PGP algos. I'm working on it.
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