Is there a way to decrypt an encrypted data on fly while uploading it on Azure blob storage using Azure Key Vault?

Question

We have a scenerio in our case:

1. A file is encrypted using the consumer's public key over a physical device.
2. That encrypted file, in decrypted format, is to be stored over Azure blob storage.
3. The consumer's private key is already stored in a Azure key vault. Problem statement: Is there a way (in step 2) to decrypt the encrypted data on the fly while uploading to the Azure Blob Storage using Python. Any link/refernce would be appreciated.

Answer 1

Yes, it is possible to decrypt the encrypted data on the fly while uploading it to Azure Blob Storage using Python. One way to accomplish this is to use the Azure Key Vault to retrieve the consumer's private key, and then use that key to decrypt the file before uploading it to Azure Blob Storage.

Here is an example of how you can decrypt the data on the fly using Python and the Azure Key Vault library:

Copy code
import azure.keyvault as kv
from azure.identity import DefaultAzureCredential
from azure.storage.blob import BlobServiceClient

# Connect to Azure Key Vault and retrieve private key
credential = DefaultAzureCredential()
client = kv.KeyVaultClient(credential)
private_key = client.get_secret("<key-vault-name>", "<secret-name>").value

# Decrypt file using private key
decrypted_file = some_decryption_function(encrypted_file, private_key)

# Upload decrypted file to Azure Blob Storage
blob_service_client = BlobServiceClient(<connection_string>)
blob_client = blob_service_client.get_blob_client(<container_name>, <blob_name>)
blob_client.upload_blob(decrypted_file)

You need to replace the connection string, container name and blob name with the actual values and use a decryption function that fits the encryption algorithm and key that you used. The above example uses the azure-identity and azure-keyvault-secrets package to authenticate and connect to the key vault, and azure-storage-blob package for uploading the decrypted data to Azure Blob storage.