Import a manually wrapped key

Import a key into Cloud KMS that you have wrapped manually.

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For detailed documentation that includes this code sample, see the following:

Code sample


To learn how to install and use the client library for Cloud KMS, see Cloud KMS client libraries.

def import_manually_wrapped_key(project_id, location_id, key_ring_id, crypto_key_id, import_job_id):
    Generates and imports local key material to Cloud KMS.

        project_id (string): Google Cloud project ID (e.g. 'my-project').
        location_id (string): Cloud KMS location (e.g. 'us-east1').
        key_ring_id (string): ID of the Cloud KMS key ring (e.g. 'my-key-ring').
        crypto_key_id (string): ID of the key to import (e.g. 'my-asymmetric-signing-key').
        import_job_id (string): ID of the import job (e.g. 'my-import-job').

    # Import the client library and Python standard cryptographic libraries.
    import os
    from cryptography.hazmat import backends
    from cryptography.hazmat.primitives import hashes, keywrap, serialization
    from cryptography.hazmat.primitives.asymmetric import ec, padding
    from import kms

    # Generate some key material in Python and format it in PKCS #8 DER as
    # required by Google Cloud KMS.
    key = ec.generate_private_key(ec.SECP256R1, backends.default_backend())
    formatted_key = key.private_bytes(

    print('Generated key bytes: {}'.format(formatted_key))

    # Create the client.
    client = kms.KeyManagementServiceClient()

    # Retrieve the fully-qualified crypto_key and import_job string.
    crypto_key_name = client.crypto_key_path(
        project_id, location_id, key_ring_id, crypto_key_id)
    import_job_name = client.import_job_path(
        project_id, location_id, key_ring_id, import_job_id)

    # Generate a temporary 32-byte key for AES-KWP and wrap the key material.
    kwp_key = os.urandom(32)
    wrapped_target_key = keywrap.aes_key_wrap_with_padding(
        kwp_key, formatted_key, backends.default_backend())

    # Retrieve the public key from the import job.
    import_job = client.get_import_job(name=import_job_name)
    import_job_pub = serialization.load_pem_public_key(
        bytes(import_job.public_key.pem, 'UTF-8'), backends.default_backend())

    # Wrap the KWP key using the import job key.
    wrapped_kwp_key = import_job_pub.encrypt(

    # Import the wrapped key material.
        "parent": crypto_key_name,
        "import_job": import_job_name,
        "algorithm": kms.CryptoKeyVersion.CryptoKeyVersionAlgorithm.EC_SIGN_P256_SHA256,
        "rsa_aes_wrapped_key": wrapped_kwp_key + wrapped_target_key,

    print('Imported: {}'.format(

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