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/*
* Copyright 2010-2019 Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License").
* You may not use this file except in compliance with the License.
* A copy of the License is located at
*
* http://aws.amazon.com/apache2.0
*
* or in the "license" file accompanying this file. This file 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.
* According to cos feature, we modify some class，comment, field name, etc.
*/
package com.branch.cos.internal.crypto;
import java.io.Serializable;
import java.security.Provider;
/**
* Stores configuration parameters that will be used during encryption and
* decryption by the COS Encryption Client. With this object, you can set
* the encryption client to use Instruction Files or Object Metadata for storing
* encryption information. You can also specify your own crypto provider to be
* used during encryption and decryption.
*/
public class CryptoConfiguration implements Cloneable,Serializable {
private static final long serialVersionUID = -8646831898339939580L;
private CryptoMode cryptoMode;
private CryptoStorageMode storageMode;
private Provider cryptoProvider;
/**
* True to ignore instruction file that cannot be found during a GET
* operation; false otherwise. Default is true. This property is ignored if
* the crypto mode is {@link CryptoMode#StrictAuthenticatedEncryption} where
* missing instruction file would always cause security exception.
*/
private boolean ignoreMissingInstructionFile = true;
/**
* Creates a new CryptoConfiguration object with default storage mode and
* crypto provider settings. The default storage mode is the Object Metadata
* storage mode, and the default crypto provider is the JCE provider.
*/
public CryptoConfiguration() {
this(CryptoMode.AuthenticatedEncryption); // default to Authenticated encryption (AE)
}
/**
* @param cryptoMode
* cryptographic mode to be used
*
* @throws UnsupportedOperationException
* if the necessary security provider cannot be found or the
* necessary cryptographic operations are not supported for the
* specified crypto mode.
*/
public CryptoConfiguration(CryptoMode cryptoMode) {
check(cryptoMode);
// By default, store encryption info in metadata
this.storageMode = CryptoStorageMode.ObjectMetadata;
// A null value implies that the default JCE crypto provider will be
// used
this.cryptoProvider = null;
this.cryptoMode = cryptoMode;
}
/**
* Sets the storage mode to the specified mode.
*
* @param storageMode
* The storage mode to be used for storing encryption
* information.
*/
public void setStorageMode(CryptoStorageMode storageMode) {
this.storageMode = storageMode;
}
/**
* Sets the storage mode to the specified mode, and returns the updated
* CryptoConfiguration object.
*
* @param storageMode
* The storage mode to be used for storing encryption
* information.
* @return The updated CryptoConfiguration object.
*/
public CryptoConfiguration withStorageMode(CryptoStorageMode storageMode) {
this.storageMode = storageMode;
return this;
}
/**
* Returns the current storage mode of a CryptoConfiguration object.
*
* @return The storage mode to be used for storing encryption information.
*/
public CryptoStorageMode getStorageMode() {
return this.storageMode;
}
/**
* Sets the crypto provider to the specified provider.
*
* @param cryptoProvider
* The crypto provider whose encryption implementation will be
* used to encrypt and decrypt data.
*/
public void setCryptoProvider(Provider cryptoProvider) {
this.cryptoProvider = cryptoProvider;
}
/**
* Sets the crypto provider to the specified provider, and returns the
* updated CryptoConfiguration object.
*
* @param cryptoProvider
* The crypto provider whose encryption implementation will be
* used to encrypt and decrypt data.
* @return The updated CryptoConfiguration object.
*/
public CryptoConfiguration withCryptoProvider(Provider cryptoProvider) {
this.cryptoProvider = cryptoProvider;
return this;
}
/**
* Returns the crypto provider whose encryption implementation will be used
* to encrypt and decrypt data.
*
* @return the crypto provider whose encryption implementation will be used
* to encrypt and decrypt data.
*/
public Provider getCryptoProvider() {
return this.cryptoProvider;
}
/**
* Returns the optionally specified crypto mode applicable only to the COS
* encryption client; or null. This attribute is ignored if the COS
* encryption client is not in use.
*/
public CryptoMode getCryptoMode() {
return cryptoMode;
}
/**
* Sets the crypto mode; applicable only to the COS encryption client.
*
* @throws UnsupportedOperationException
* if the necessary security provider cannot be found or the
* necessary cryptographic operations are not supported for the
* specified crypto mode. Note the crypto mode can and will
* still (intentionally) be set in such case, and it's up to the
* caller to decide what to do about it.
*/
public void setCryptoMode(CryptoMode cryptoMode)
throws UnsupportedOperationException {
this.cryptoMode = cryptoMode;
check(cryptoMode);
}
/**
* Fluent API to set the crypto mode; applicable only to the COS encryption
* client.
*
* @throws UnsupportedOperationException
* if the necessary security provider cannot be found or the
* necessary cryptographic operations are not supported for the
* specified crypto mode.Note the crypto mode can and will still
* (intentionally) be set in such case, and it's up to the
* caller to decide what to do about it.
*/
public CryptoConfiguration withCryptoMode(CryptoMode cryptoMode)
throws UnsupportedOperationException {
this.cryptoMode = cryptoMode;
check(cryptoMode);
return this;
}
/**
* Returns true to ignore instruction file that cannot be found during a GET
* operation; false otherwise. Default is true. This property is ignored if
* the crypto mode is {@link CryptoMode#StrictAuthenticatedEncryption} where
* missing instruction file would always cause security exception.
*/
public boolean isIgnoreMissingInstructionFile() {
return ignoreMissingInstructionFile;
}
/**
* @param ignoreMissingInstructionFile
* true to ignore instruction file that cannot be found during a
* GET operation; false otherwise. Default is true. This property
* is ignored if the crypto mode is
* {@link CryptoMode#StrictAuthenticatedEncryption} where missing
* instruction file would always cause security exception.
*/
public void setIgnoreMissingInstructionFile(
boolean ignoreMissingInstructionFile) {
this.ignoreMissingInstructionFile = ignoreMissingInstructionFile;
}
/**
* Fluent API to set the property to ignore instruction file that cannot be
* found during a GET operation.
*/
public CryptoConfiguration withIgnoreMissingInstructionFile(
boolean ignoreMissingInstructionFile) {
this.ignoreMissingInstructionFile = ignoreMissingInstructionFile;
return this;
}
/**
* Checks if the crypto mode is supported by the runtime.
*
* @throws UnsupportedOperationException
* if the necessary security provider cannot be found or the
* necessary cryptographic operations are not supported for the
* specified crypto mode.
*/
private void check(CryptoMode cryptoMode) {
if (cryptoMode == CryptoMode.AuthenticatedEncryption
|| cryptoMode == CryptoMode.StrictAuthenticatedEncryption) {
if (!CryptoRuntime.isBouncyCastleAvailable()) {
CryptoRuntime.enableBouncyCastle();
if (!CryptoRuntime.isBouncyCastleAvailable()) {
throw new UnsupportedOperationException(
"The Bouncy castle library jar is required on the classpath to enable authenticated encryption");
}
}
if (!CryptoRuntime.isAesGcmAvailable())
throw new UnsupportedOperationException(
"More recent version of the Bouncy castle library is required to enable authenticated encryption");
}
}
public boolean isReadOnly() { return false; }
/**
* Used to provide a read-only copy of the configuration.
*/
private static final class ReadOnly extends CryptoConfiguration {
private static final long serialVersionUID = -7579268925296074735L;
private ReadOnly() {}
@Override public boolean isReadOnly() { return true; }
@Override public void setStorageMode(CryptoStorageMode storageMode) {
throw new UnsupportedOperationException();
}
@Override public CryptoConfiguration withStorageMode(CryptoStorageMode storageMode) {
throw new UnsupportedOperationException();
}
@Override public void setCryptoProvider(Provider cryptoProvider) {
throw new UnsupportedOperationException();
}
@Override public CryptoConfiguration withCryptoProvider(Provider cryptoProvider) {
throw new UnsupportedOperationException();
}
@Override public void setCryptoMode(CryptoMode cryptoMode) {
throw new UnsupportedOperationException();
}
@Override public CryptoConfiguration withCryptoMode(CryptoMode cryptoMode) {
throw new UnsupportedOperationException();
}
@Override public void setIgnoreMissingInstructionFile(
boolean ignoreMissingInstructionFile) {
throw new UnsupportedOperationException();
}
@Override public CryptoConfiguration withIgnoreMissingInstructionFile(
boolean ignoreMissingInstructionFile) {
throw new UnsupportedOperationException();
}
}
/**
* Returns a read-only copy of this configuration.
*/
public CryptoConfiguration readOnly() {
if (isReadOnly())
return this;
return copyTo(new CryptoConfiguration.ReadOnly());
}
@Override
public CryptoConfiguration clone() {
return copyTo(new CryptoConfiguration());
}
private CryptoConfiguration copyTo(CryptoConfiguration that) {
that.cryptoMode = this.cryptoMode;
that.storageMode = this.storageMode;
that.cryptoProvider = this.cryptoProvider;
that.ignoreMissingInstructionFile = this.ignoreMissingInstructionFile;
return that;
}
}