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**Example 1: To download the public key of an asymmetric KMS key**

The following ``get-public-key`` example downloads the public key of an asymmetric KMS key. 

In addition to returning the public key, the output includes information that you need to use the public key safely outside of AWS KMS, including the key usage and supported encryption algorithms. ::

    aws kms get-public-key \
        --key-id 1234abcd-12ab-34cd-56ef-1234567890ab

Output::

    {
        "KeyId": "arn:aws:kms:us-west-2:111122223333:key/1234abcd-12ab-34cd-56ef-1234567890ab",
        "PublicKey": "jANBgkqhkiG9w0BAQEFAAOCAg8AMIICCgKCAgEAl5epvg1/QtJhxSi2g9SDEVg8QV/...",
        "CustomerMasterKeySpec": "RSA_4096",
        "KeyUsage": "ENCRYPT_DECRYPT",
        "EncryptionAlgorithms": [
            "RSAES_OAEP_SHA_1",
            "RSAES_OAEP_SHA_256"
        ]
    }

For more information about using asymmetric KMS keys in AWS KMS, see `Using Symmetric and Asymmetric Keys <https://docs.aws.amazon.com/kms/latest/developerguide/symmetric-asymmetric.html>`__ in the *AWS Key Management Service API Reference*.

**Example 2: To convert a public key to DER format (Linux and macOS)**

The following ``get-public-key`` example downloads the public key of an asymmetric KMS key and saves it in a DER file.

When you use the ``get-public-key`` command in the AWS CLI, it returns a DER-encoded X.509 public key that is Base64-encoded. This example gets the value of the ``PublicKey`` property as text. It Base64-decodes the ``PublicKey`` and saves it in the ``public_key.der`` file. The ``output`` parameter returns the output as text, instead of JSON. The ``--query`` parameter gets only the ``PublicKey`` property, not the properties that you need to use the public key safely outside of AWS KMS. 

Before running this command, replace the example key ID with a valid key ID from your AWS account. ::

    aws kms get-public-key \
        --key-id 1234abcd-12ab-34cd-56ef-1234567890ab \
        --output text \
        --query PublicKey | base64 --decode > public_key.der

This command produces no output.

For more information about using asymmetric KMS keys in AWS KMS, see `Using Symmetric and Asymmetric Keys <https://docs.aws.amazon.com/kms/latest/developerguide/symmetric-asymmetric.html>`__ in the *AWS Key Management Service API Reference*.

Filemanager

Name Type Size Permission Actions
cancel-key-deletion.rst File 884 B 0644
connect-custom-key-store.rst File 1.08 KB 0755
create-alias.rst File 729 B 0644
create-custom-key-store.rst File 3.75 KB 0755
create-grant.rst File 1.18 KB 0755
create-key.rst File 12.17 KB 0644
decrypt.rst File 4.44 KB 0644
delete-alias.rst File 502 B 0644
delete-custom-key-store.rst File 1.47 KB 0755
delete-imported-key-material.rst File 656 B 0644
describe-custom-key-stores.rst File 5.32 KB 0755
describe-key.rst File 5.76 KB 0644
disable-key-rotation.rst File 679 B 0644
disable-key.rst File 503 B 0644
disconnect-custom-key-store.rst File 1.25 KB 0644
enable-key-rotation.rst File 708 B 0644
enable-key.rst File 1.02 KB 0644
encrypt.rst File 3.47 KB 0644
generate-data-key-pair-without-plaintext.rst File 1.66 KB 0644
generate-data-key-pair.rst File 1.73 KB 0644
generate-data-key-without-plaintext.rst File 1.35 KB 0644
generate-data-key.rst File 3.17 KB 0644
generate-random.rst File 3.16 KB 0644
get-key-policy.rst File 956 B 0644
get-key-rotation-status.rst File 656 B 0644
get-parameters-for-import.rst File 1.36 KB 0644
get-public-key.rst File 2.31 KB 0644
import-key-material.rst File 1.51 KB 0644
list-aliases.rst File 2.72 KB 0755
list-grants.rst File 2.55 KB 0755
list-key-policies.rst File 926 B 0644
list-keys.rst File 1.04 KB 0644
list-resource-tags.rst File 980 B 0644
list-retirable-grants.rst File 2.92 KB 0644
put-key-policy.rst File 3.44 KB 0755
re-encrypt.rst File 3.82 KB 0644
retire-grant.rst File 810 B 0644
revoke-grant.rst File 776 B 0644
schedule-key-deletion.rst File 1.44 KB 0644
sign.rst File 3.08 KB 0644
tag-resource.rst File 891 B 0644
untag-resource.rst File 836 B 0644
update-alias.rst File 814 B 0644
update-custom-key-store.rst File 6.61 KB 0755
update-key-description.rst File 1.85 KB 0644
verify.rst File 1.38 KB 0644