Decrypt DynamoDB Stream using DynamoDB Encryption Client (Item Encryptor)?

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I encrypted records using DynamoDB Encryption Client (Item Encryptor) (Lib Link). Now I want to decrypt it. I've read the docs and GitHub page, there is no example so it's really hard to figure out what part I got wrong.

This is the "NewImage" from DynamoDB event. The key is "ID". DynamoDB Stream Record

I've tried:

  • Using decrypt_dynamodb_item -> not working
"errorMessage": "Invalid material description",
"errorType": "InvalidMaterialDescriptionError",
  • Convert the "NewImage" to ddb type using ddb_to_dict then using decrypt_dynamodb_item-> not working
"errorMessage": "Value must be of the following types: <class 'bytearray'>, <class 'bytes'>.",
"errorType": "TypeError",
  • Get the record directly from the table using get_item (instead of using the DynamoDB Stream event) and decrypt it using decrypt_python_item. And, it worked -> So I'm pretty sure my cryto_config is right. The record configuration which I get directly from the table: DynamoDB Get_Item Record

Do anyone know how to decrypt DynamoDB Stream using DynamoDB Encryption Client. Thanks!

amazon-dynamodb-streams amazon-dynamodb aws-lambda amazon-web-services python-3.x
1 Answers

I had a similar issue. I was able to get the item when I called query() using DDB Mapper but was not able to do so using marshallIntoObject() on the DynamoDB stream.

The issue was that the binary attributes in the Dynamo DB stream are encoded in Base64. They need to be decoded first before being passed to the API.

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