数据密钥缓存示例代码

以下示例使用版本 2。 的 x 个 AWS Encryption SDK for Java。版本 3。 其中 x AWS Encryption SDK for Java 已弃用数据密钥缓存。CMM使用版本 3。 x，你也可以使用AWS KMS 分层密钥环，这是一种替代的加密材料缓存解决方案。

/*
 * Copyright 2017 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.
 */
package com.amazonaws.crypto.examples.kinesisdatakeycaching;

import com.amazonaws.encryptionsdk.AwsCrypto;
import com.amazonaws.encryptionsdk.CommitmentPolicy;
import com.amazonaws.encryptionsdk.CryptoResult;
import com.amazonaws.encryptionsdk.MasterKeyProvider;
import com.amazonaws.encryptionsdk.caching.CachingCryptoMaterialsManager;
import com.amazonaws.encryptionsdk.caching.LocalCryptoMaterialsCache;
import com.amazonaws.encryptionsdk.kmssdkv2.KmsMasterKey;
import com.amazonaws.encryptionsdk.kmssdkv2.KmsMasterKeyProvider;
import com.amazonaws.encryptionsdk.multi.MultipleProviderFactory;
import com.amazonaws.util.json.Jackson;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.UUID;
import java.util.concurrent.TimeUnit;
import software.amazon.awssdk.auth.credentials.AwsCredentialsProvider;
import software.amazon.awssdk.auth.credentials.DefaultCredentialsProvider;
import software.amazon.awssdk.core.SdkBytes;
import software.amazon.awssdk.regions.Region;
import software.amazon.awssdk.services.kinesis.KinesisClient;
import software.amazon.awssdk.services.kms.KmsClient;

/**
 * Pushes data to Kinesis Streams in multiple Regions.
 */
public class MultiRegionRecordPusher {

    private static final long MAX_ENTRY_AGE_MILLISECONDS = 300000;
    private static final long MAX_ENTRY_USES = 100;
    private static final int MAX_CACHE_ENTRIES = 100;
    private final String streamName_;
    private final ArrayList<KinesisClient> kinesisClients_;
    private final CachingCryptoMaterialsManager cachingMaterialsManager_;
    private final AwsCrypto crypto_;

    /**
     * Creates an instance of this object with Kinesis clients for all target Regions and a cached
     * key provider containing KMS master keys in all target Regions.
     */
    public MultiRegionRecordPusher(final Region[] regions, final String kmsAliasName,
        final String streamName) {
        streamName_ = streamName;
        crypto_ = AwsCrypto.builder()
            .withCommitmentPolicy(CommitmentPolicy.RequireEncryptRequireDecrypt)
            .build();
        kinesisClients_ = new ArrayList<>();

        AwsCredentialsProvider credentialsProvider = DefaultCredentialsProvider.builder().build();

        // Build KmsMasterKey and AmazonKinesisClient objects for each target region
        List<KmsMasterKey> masterKeys = new ArrayList<>();
        for (Region region : regions) {
            kinesisClients_.add(KinesisClient.builder()
                .credentialsProvider(credentialsProvider)
                .region(region)
                .build());

            KmsMasterKey regionMasterKey = KmsMasterKeyProvider.builder()
                .defaultRegion(region)
                .builderSupplier(() -> KmsClient.builder().credentialsProvider(credentialsProvider))
                .buildStrict(kmsAliasName)
                .getMasterKey(kmsAliasName);

            masterKeys.add(regionMasterKey);
        }

        // Collect KmsMasterKey objects into single provider and add cache
        MasterKeyProvider<?> masterKeyProvider = MultipleProviderFactory.buildMultiProvider(
            KmsMasterKey.class,
            masterKeys
        );

        cachingMaterialsManager_ = CachingCryptoMaterialsManager.newBuilder()
            .withMasterKeyProvider(masterKeyProvider)
            .withCache(new LocalCryptoMaterialsCache(MAX_CACHE_ENTRIES))
            .withMaxAge(MAX_ENTRY_AGE_MILLISECONDS, TimeUnit.MILLISECONDS)
            .withMessageUseLimit(MAX_ENTRY_USES)
            .build();
    }

    /**
     * JSON serializes and encrypts the received record data and pushes it to all target streams.
     */
    public void putRecord(final Map<Object, Object> data) {
        String partitionKey = UUID.randomUUID().toString();
        Map<String, String> encryptionContext = new HashMap<>();
        encryptionContext.put("stream", streamName_);

        // JSON serialize data
        String jsonData = Jackson.toJsonString(data);

        // Encrypt data
        CryptoResult<byte[], ?> result = crypto_.encryptData(
            cachingMaterialsManager_,
            jsonData.getBytes(),
            encryptionContext
        );
        byte[] encryptedData = result.getResult();

        // Put records to Kinesis stream in all Regions
        for (KinesisClient regionalKinesisClient : kinesisClients_) {
            regionalKinesisClient.putRecord(builder ->
                builder.streamName(streamName_)
                    .data(SdkBytes.fromByteArray(encryptedData))
                    .partitionKey(partitionKey));
        }
    }
}

"""
Copyright 2017 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
 
https://aws.amazon.com/apache-2-0/
 
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.
"""
import json
import uuid
 
from aws_encryption_sdk import EncryptionSDKClient, StrictAwsKmsMasterKeyProvider, CachingCryptoMaterialsManager, LocalCryptoMaterialsCache, CommitmentPolicy
from aws_encryption_sdk.key_providers.kms import KMSMasterKey
import boto3
 
 
class MultiRegionRecordPusher(object):
    """Pushes data to Kinesis Streams in multiple Regions."""
    CACHE_CAPACITY = 100
    MAX_ENTRY_AGE_SECONDS = 300.0
    MAX_ENTRY_MESSAGES_ENCRYPTED = 100
 
    def __init__(self, regions, kms_alias_name, stream_name):
        self._kinesis_clients = []
        self._stream_name = stream_name
 
        # Set up EncryptionSDKClient
        _client = EncryptionSDKClient(CommitmentPolicy.REQUIRE_ENCRYPT_REQUIRE_DECRYPT)
 
        # Set up KMSMasterKeyProvider with cache
        _key_provider = StrictAwsKmsMasterKeyProvider(kms_alias_name)
 
        # Add MasterKey and Kinesis client for each Region
        for region in regions:
            self._kinesis_clients.append(boto3.client('kinesis', region_name=region))
            regional_master_key = KMSMasterKey(
                client=boto3.client('kms', region_name=region),
                key_id=kms_alias_name
            )
            _key_provider.add_master_key_provider(regional_master_key)
 
        cache = LocalCryptoMaterialsCache(capacity=self.CACHE_CAPACITY)
        self._materials_manager = CachingCryptoMaterialsManager(
            master_key_provider=_key_provider,
            cache=cache,
            max_age=self.MAX_ENTRY_AGE_SECONDS,
            max_messages_encrypted=self.MAX_ENTRY_MESSAGES_ENCRYPTED
        )
 
    def put_record(self, record_data):
        """JSON serializes and encrypts the received record data and pushes it to all target streams.
 
        :param dict record_data: Data to write to stream
        """
        # Kinesis partition key to randomize write load across stream shards
        partition_key = uuid.uuid4().hex
 
        encryption_context = {'stream': self._stream_name}
 
        # JSON serialize data
        json_data = json.dumps(record_data)
 
        # Encrypt data
        encrypted_data, _header = _client.encrypt(
            source=json_data,
            materials_manager=self._materials_manager,
            encryption_context=encryption_context
        )
 
        # Put records to Kinesis stream in all Regions
        for client in self._kinesis_clients:
            client.put_record(
                StreamName=self._stream_name,
                Data=encrypted_data,
                PartitionKey=partition_key
            )

以下示例使用版本 2。 的 x 个 AWS Encryption SDK for Java。版本 3。 其中 x AWS Encryption SDK for Java 已弃用数据密钥缓存。CMM使用版本 3。 x，你也可以使用AWS KMS 分层密钥环，这是一种替代的加密材料缓存解决方案。

此代码创建了在严格模式下解密的主密钥提供程序。 AWS Encryption SDK 只能使用 AWS KMS keys 您指定的来解密您的消息。

/*
 * Copyright 2017 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.
 */
package com.amazonaws.crypto.examples.kinesisdatakeycaching;

import com.amazonaws.encryptionsdk.AwsCrypto;
import com.amazonaws.encryptionsdk.CommitmentPolicy;
import com.amazonaws.encryptionsdk.CryptoResult;
import com.amazonaws.encryptionsdk.caching.CachingCryptoMaterialsManager;
import com.amazonaws.encryptionsdk.caching.LocalCryptoMaterialsCache;
import com.amazonaws.encryptionsdk.kmssdkv2.KmsMasterKeyProvider;
import com.amazonaws.services.lambda.runtime.Context;
import com.amazonaws.services.lambda.runtime.events.KinesisEvent;
import com.amazonaws.services.lambda.runtime.events.KinesisEvent.KinesisEventRecord;
import com.amazonaws.util.BinaryUtils;
import java.io.UnsupportedEncodingException;
import java.nio.ByteBuffer;
import java.nio.charset.StandardCharsets;
import java.util.concurrent.TimeUnit;
import software.amazon.awssdk.enhanced.dynamodb.DynamoDbEnhancedClient;
import software.amazon.awssdk.enhanced.dynamodb.DynamoDbTable;
import software.amazon.awssdk.enhanced.dynamodb.TableSchema;

/**
 * Decrypts all incoming Kinesis records and writes records to DynamoDB.
 */
public class LambdaDecryptAndWrite {

    private static final long MAX_ENTRY_AGE_MILLISECONDS = 600000;
    private static final int MAX_CACHE_ENTRIES = 100;
    private final CachingCryptoMaterialsManager cachingMaterialsManager_;
    private final AwsCrypto crypto_;
    private final DynamoDbTable<Item> table_;

    /**
     * Because the cache is used only for decryption, the code doesn't set the max bytes or max
     * message security thresholds that are enforced only on on data keys used for encryption.
     */
    public LambdaDecryptAndWrite() {
        String kmsKeyArn = System.getenv("CMK_ARN");
        cachingMaterialsManager_ = CachingCryptoMaterialsManager.newBuilder()
            .withMasterKeyProvider(KmsMasterKeyProvider.builder().buildStrict(kmsKeyArn))
            .withCache(new LocalCryptoMaterialsCache(MAX_CACHE_ENTRIES))
            .withMaxAge(MAX_ENTRY_AGE_MILLISECONDS, TimeUnit.MILLISECONDS)
            .build();

        crypto_ = AwsCrypto.builder()
            .withCommitmentPolicy(CommitmentPolicy.RequireEncryptRequireDecrypt)
            .build();

        String tableName = System.getenv("TABLE_NAME");
        DynamoDbEnhancedClient dynamodb = DynamoDbEnhancedClient.builder().build();
        table_ = dynamodb.table(tableName, TableSchema.fromClass(Item.class));
    }

    /**
     * @param event
     * @param context
     */
    public void handleRequest(KinesisEvent event, Context context)
        throws UnsupportedEncodingException {
        for (KinesisEventRecord record : event.getRecords()) {
            ByteBuffer ciphertextBuffer = record.getKinesis().getData();
            byte[] ciphertext = BinaryUtils.copyAllBytesFrom(ciphertextBuffer);

            // Decrypt and unpack record
            CryptoResult<byte[], ?> plaintextResult = crypto_.decryptData(cachingMaterialsManager_,
                ciphertext);

            // Verify the encryption context value
            String streamArn = record.getEventSourceARN();
            String streamName = streamArn.substring(streamArn.indexOf("/") + 1);
            if (!streamName.equals(plaintextResult.getEncryptionContext().get("stream"))) {
                throw new IllegalStateException("Wrong Encryption Context!");
            }

            // Write record to DynamoDB
            String jsonItem = new String(plaintextResult.getResult(), StandardCharsets.UTF_8);
            System.out.println(jsonItem);
            table_.putItem(Item.fromJSON(jsonItem));
        }
    }

    private static class Item {

        static Item fromJSON(String jsonText) {
            // Parse JSON and create new Item
            return new Item();
        }
    }
}

此 Python 代码在发现模式下使用主密钥提供程序进行解密。该代码允许 AWS Encryption SDK 使用任何加密数据密钥的包装密钥对其进行解密。最佳实践是使用严格模式，在这种模式下，您可以指定可用于解密的包装密钥。

"""
Copyright 2017 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
 
https://aws.amazon.com/apache-2-0/
 
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.
"""
import base64
import json
import logging
import os
 
from aws_encryption_sdk import EncryptionSDKClient, DiscoveryAwsKmsMasterKeyProvider, CachingCryptoMaterialsManager, LocalCryptoMaterialsCache, CommitmentPolicy
import boto3
 
_LOGGER = logging.getLogger(__name__)
_is_setup = False
CACHE_CAPACITY = 100
MAX_ENTRY_AGE_SECONDS = 600.0
 
def setup():
    """Sets up clients that should persist across Lambda invocations."""
    global encryption_sdk_client
    encryption_sdk_client = EncryptionSDKClient(CommitmentPolicy.REQUIRE_ENCRYPT_REQUIRE_DECRYPT)
 
    global materials_manager
    key_provider = DiscoveryAwsKmsMasterKeyProvider()
    cache = LocalCryptoMaterialsCache(capacity=CACHE_CAPACITY)
           
    #  Because the cache is used only for decryption, the code doesn't set
    #   the max bytes or max message security thresholds that are enforced
    #   only on on data keys used for encryption.
    materials_manager = CachingCryptoMaterialsManager(
        master_key_provider=key_provider,
        cache=cache,
        max_age=MAX_ENTRY_AGE_SECONDS
    )
    global table
    table_name = os.environ.get('TABLE_NAME')
    table = boto3.resource('dynamodb').Table(table_name)
    global _is_setup
    _is_setup = True
 
 
def lambda_handler(event, context):
    """Decrypts all incoming Kinesis records and writes records to DynamoDB."""
    _LOGGER.debug('New event:')
    _LOGGER.debug(event)
    if not _is_setup:
        setup()
    with table.batch_writer() as batch:
        for record in event.get('Records', []):
            # Record data base64-encoded by Kinesis
            ciphertext = base64.b64decode(record['kinesis']['data'])
 
            # Decrypt and unpack record
            plaintext, header = encryption_sdk_client.decrypt(
                source=ciphertext,
                materials_manager=materials_manager
            )
            item = json.loads(plaintext)
 
            # Verify the encryption context value
            stream_name = record['eventSourceARN'].split('/', 1)[1]
            if stream_name != header.encryption_context['stream']:
                raise ValueError('Wrong Encryption Context!')
 
            # Write record to DynamoDB
            batch.put_item(Item=item)