Create encryption keys with Cloud KMS

Create encryption keys with Cloud KMS

This quickstart shows you how to create and use encryption keys with Cloud Key Management Service in a project you own. These instructions use the Google Cloud console to create key rings, keys, and key versions in Cloud KMS. For instructions that use other methods, see How-to guides.

This quickstart uses the command line to send requests to the Cloud KMS API. For programming examples that use the client libraries to send requests to the Cloud KMS API, see Encrypting and Decrypting.

Before you begin

1. Sign in to your Google Cloud account. If you're new to Google Cloud, create an account to evaluate how our products perform in real-world scenarios. New customers also get $300 in free credits to run, test, and deploy workloads.

2. In the Google Cloud console, on the project selector page, select or create a Google Cloud project.

   Note: If you don't plan to keep the resources that you create in this procedure, create a project instead of selecting an existing project. After you finish these steps, you can delete the project, removing all resources associated with the project.

   Go to project selector

3. Make sure that billing is enabled for your Google Cloud project.

4. Enable the Cloud KMS API.

   Enable the API

5. Install the Google Cloud CLI.

6. To initialize the gcloud CLI, run the following command:

   gcloud init

7. In the Google Cloud console, on the project selector page, select or create a Google Cloud project.

   Note: If you don't plan to keep the resources that you create in this procedure, create a project instead of selecting an existing project. After you finish these steps, you can delete the project, removing all resources associated with the project.

   Go to project selector

8. Make sure that billing is enabled for your Google Cloud project.

9. Enable the Cloud KMS API.

   Enable the API

10. Install the Google Cloud CLI.

11. To initialize the gcloud CLI, run the following command:

    gcloud init

Important: This quickstart creates Cloud KMS resources such as key rings and keys. Once created, these resources cannot be deleted. For more information, see Why can't I delete keys or key rings?.

Key rings and keys

To encrypt and decrypt content you will need a Cloud KMS key, which is part of a key ring.

Create a key ring named test, and a key named quickstart. Refer to the object hierarchy overview for more information about these objects and how they are related.

gcloud kms keyrings create "test" \
    --location "global"

gcloud kms keys create "quickstart" \
    --location "global" \
    --keyring "test" \
    --purpose "encryption"

You can use the list option to view the name and metadata for the key that you just created.

gcloud kms keys list \
    --location "global" \
    --keyring "test"

You should see:

NAME                                                                      PURPOSE          PRIMARY_STATE
projects/project-id/locations/global/keyRings/test/cryptoKeys/quickstart  ENCRYPT_DECRYPT  ENABLED

Encrypt data

Now that you have a key, you can use that key to encrypt text or binary content.

Store some text to be encrypted in a file called "mysecret.txt".

echo -n "Some text to be encrypted" > mysecret.txt

To encrypt the data with gcloud kms encrypt, provide your key information, specify the name of the plaintext file to encrypt, and specify the name of the file that will contain the encrypted content:

gcloud kms encrypt \
    --location "global" \
    --keyring "test" \
    --key "quickstart" \
    --plaintext-file ./mysecret.txt \
    --ciphertext-file ./mysecret.txt.encrypted

The encrypt method saves your encrypted content in the file specified by the --ciphertext-file flag.

Decrypt ciphertext

To decrypt the data with gcloud kms decrypt, provide your key information, specify the name of the encrypted file (ciphertext file) to decrypt, and specify the name of the file that will contain the decrypted content:

gcloud kms decrypt \
    --location "global" \
    --keyring "test" \
    --key "quickstart" \
    --ciphertext-file ./mysecret.txt.encrypted \
    --plaintext-file ./mysecret.txt.decrypted

The decrypt method saves your decrypted content in the file specified by the --plaintext-file flag.

To decrypt encrypted content, you must use the same key that was used to encrypt the content.

Clean up

To avoid incurring charges to your Google Cloud account for the resources used on this page, follow these steps.

List the versions available for your key:

gcloud kms keys versions list \
    --location "global" \
    --keyring "test" \
    --key "quickstart"

To destroy a version, run the following command, replacing key-version with the number of the key version to be destroyed:

Important: When you destroy a key version, you can no longer decrypt content that was encrypted using that version of the key. Make sure that you no longer need a key version before you destroy it.

gcloud kms keys versions destroy key-version \
    --location "global" \
    --keyring "test" \
    --key "quickstart"

What's next

• Start using the API.
• Take a look at the API Reference.
• Learn more about how to encrypt data at rest.