AWS Key Management Service (AWS KMS) is an encryption and key management web service. This guide describes the AWS KMS operations that you can call programmatically. For general information about AWS KMS, see the AWS Key Management Service Developer Guide .
AWS provides SDKs that consist of libraries and sample code for various programming languages and platforms (Java, Ruby, .Net, macOS, Android, etc.). The SDKs provide a convenient way to create programmatic access to AWS KMS and other AWS services. For example, the SDKs take care of tasks such as signing requests (see below), managing errors, and retrying requests automatically. For more information about the AWS SDKs, including how to download and install them, see Tools for Amazon Web Services.
We recommend that you use the AWS SDKs to make programmatic API calls to AWS KMS.
Clients must support TLS (Transport Layer Security) 1.0. We recommend TLS 1.2. Clients must also support cipher suites with Perfect Forward Secrecy (PFS) such as Ephemeral Diffie-Hellman (DHE) or Elliptic Curve Ephemeral Diffie-Hellman (ECDHE). Most modern systems such as Java 7 and later support these modes.
Signing Requests
Requests must be signed by using an access key ID and a secret access key. We strongly recommend that you do not use your AWS account (root) access key ID and secret key for everyday work with AWS KMS. Instead, use the access key ID and secret access key for an IAM user. You can also use the AWS Security Token Service to generate temporary security credentials that you can use to sign requests.
All AWS KMS operations require Signature Version 4.
Logging API Requests
AWS KMS supports AWS CloudTrail, a service that logs AWS API calls and related events for your AWS account and delivers them to an Amazon S3 bucket that you specify. By using the information collected by CloudTrail, you can determine what requests were made to AWS KMS, who made the request, when it was made, and so on. To learn more about CloudTrail, including how to turn it on and find your log files, see the AWS CloudTrail User Guide.
Additional Resources
For more information about credentials and request signing, see the following:
AWS Security Credentials - This topic provides general information about the types of credentials used for accessing AWS.
Temporary Security Credentials - This section of the IAM User Guide describes how to create and use temporary security credentials.
Signature Version 4 Signing Process - This set of topics walks you through the process of signing a request using an access key ID and a secret access key.
Commonly Used API Operations
Of the API operations discussed in this guide, the following will prove the most useful for most applications. You will likely perform operations other than these, such as creating keys and assigning policies, by using the console.
encrypt
decrypt
generate_data_key
generate_data_key_without_plaintext
kms(config = list())A client for the service. You can call the service's operations using
syntax like svc$operation(...), where svc is the name you've assigned
to the client. The available operations are listed in the
Operations section.
Optional configuration of credentials, endpoint, and/or region.
svc <- kms(
config = list(
credentials = list(
creds = list(
access_key_id = "string",
secret_access_key = "string",
session_token = "string"
),
profile = "string"
),
endpoint = "string",
region = "string"
)
)
| cancel_key_deletion | Cancels the deletion of a customer master key (CMK) |
| connect_custom_key_store | Connects or reconnects a custom key store to its associated AWS CloudHSM cluster |
| create_alias | Creates a friendly name for a customer master key (CMK) |
| create_custom_key_store | Creates a custom key store that is associated with an AWS CloudHSM cluster that you own and manage |
| create_grant | Adds a grant to a customer master key (CMK) |
| create_key | Creates a unique customer managed customer master key (CMK) in your AWS account and Region |
| decrypt | Decrypts ciphertext that was encrypted by a AWS KMS customer master key (CMK) using any of the following operations: |
| delete_alias | Deletes the specified alias |
| delete_custom_key_store | Deletes a custom key store |
| delete_imported_key_material | Deletes key material that you previously imported |
| describe_custom_key_stores | Gets information about custom key stores in the account and region |
| describe_key | Provides detailed information about a customer master key (CMK) |
| disable_key | Sets the state of a customer master key (CMK) to disabled |
| disable_key_rotation | Disables automatic rotation of the key material for the specified symmetric customer master key (CMK) |
| disconnect_custom_key_store | Disconnects the custom key store from its associated AWS CloudHSM cluster |
| enable_key | Sets the key state of a customer master key (CMK) to enabled |
| enable_key_rotation | Enables automatic rotation of the key material for the specified symmetric customer master key (CMK) |
| encrypt | Encrypts plaintext into ciphertext by using a customer master key (CMK) |
| generate_data_key | Generates a unique symmetric data key for client-side encryption |
| generate_data_key_pair | Generates a unique asymmetric data key pair |
| generate_data_key_pair_without_plaintext | Generates a unique asymmetric data key pair |
| generate_data_key_without_plaintext | Generates a unique symmetric data key |
| generate_random | Returns a random byte string that is cryptographically secure |
| get_key_policy | Gets a key policy attached to the specified customer master key (CMK) |
| get_key_rotation_status | Gets a Boolean value that indicates whether automatic rotation of the key material is enabled for the specified customer master key (CMK) |
| get_parameters_for_import | Returns the items you need to import key material into a symmetric, customer managed customer master key (CMK) |
| get_public_key | Returns the public key of an asymmetric CMK |
| import_key_material | Imports key material into an existing symmetric AWS KMS customer master key (CMK) that was created without key material |
| list_aliases | Gets a list of aliases in the caller's AWS account and region |
| list_grants | Gets a list of all grants for the specified customer master key (CMK) |
| list_key_policies | Gets the names of the key policies that are attached to a customer master key (CMK) |
| list_keys | Gets a list of all customer master keys (CMKs) in the caller's AWS account and Region |
| list_resource_tags | Returns all tags on the specified customer master key (CMK) |
| list_retirable_grants | Returns all grants in which the specified principal is the RetiringPrincipal in the grant |
| put_key_policy | Attaches a key policy to the specified customer master key (CMK) |
| re_encrypt | Decrypts ciphertext and then reencrypts it entirely within AWS KMS |
| retire_grant | Retires a grant |
| revoke_grant | Revokes the specified grant for the specified customer master key (CMK) |
| schedule_key_deletion | Schedules the deletion of a customer master key (CMK) |
| sign | Creates a digital signature for a message or message digest by using the private key in an asymmetric CMK |
| tag_resource | Adds or edits tags on a customer managed CMK |
| untag_resource | Deletes tags from a customer managed CMK |
| update_alias | Associates an existing AWS KMS alias with a different customer master key (CMK) |
| update_custom_key_store | Changes the properties of a custom key store |
| update_key_description | Updates the description of a customer master key (CMK) |
| verify | Verifies a digital signature that was generated by the Sign operation |
if (FALSE) {
svc <- kms()
# The following example cancels deletion of the specified CMK.
svc$cancel_key_deletion(
KeyId = "1234abcd-12ab-34cd-56ef-1234567890ab"
)
}
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