2021-03-23 21:14:25 +00:00
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---
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layout: docs
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page_title: AWS KMS - Key Management - Secrets Engines
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description: AWS KMS is a supported KMS provider of the Key Management secrets engine.
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---
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# AWS KMS
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The Key Management secrets engine supports lifecycle management of keys in [AWS KMS](https://aws.amazon.com/kms/)
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regions. This is accomplished by configuring a KMS provider resource with the `awskms` provider and
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other provider-specific parameter values.
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The following sections describe how to properly configure the secrets engine to enable
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the functionality.
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## Authentication
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The Key Management secrets engine must be configured with credentials that have sufficient
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permissions to manage keys in an AWS KMS region. The authentication parameters are described
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in the [credentials](/api/secret/key-management/awskms#credentials) section of the API
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documentation. The authentication parameters will be set with the following order of
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precedence:
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1. [KMS provider credentials](/api/secret/key-management/awskms#credentials)
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2. Environment variables
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3. Shared credentials file
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4. IAM role for AWS EC2 or ECS task
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The IAM principal associated with the provided credentials must have the following minimum
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[AWS KMS permissions](https://docs.aws.amazon.com/kms/latest/developerguide/kms-api-permissions-reference.html):
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- `kms:CreateKey`
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- `kms:GetParametersForImport`
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- `kms:ImportKeyMaterial`
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- `kms:EnableKey`
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- `kms:DisableKey`
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- `kms:ScheduleKeyDeletion`
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- `kms:CreateAlias`
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- `kms:UpdateAlias`
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- `kms:DeleteAlias`
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- `kms:ListAliases`
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- `kms:TagResource`
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## Configuration
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The following is an example of how to configure the KMS provider resource using the Vault CLI:
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2021-04-06 17:49:04 +00:00
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```text
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$ vault write keymgmt/kms/example-kms \
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provider="awskms" \
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key_collection="us-west-1" \
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credentials=access_key="ASIADJO3WTX6WPLJM42V" \
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credentials=secret_key="bCiYmNroLxLmPNQ47VIvjlm8mQu5oktZcQdq195w"
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```
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Refer to the AWS KMS [API documentation](/api/secret/key-management/awskms)
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for a detailed description of individual configuration parameters.
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## Key Transfer Specification
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Keys are securely transferred from the secrets engine to AWS KMS regions in accordance
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with the AWS KMS [Bring Your Own Key](https://docs.aws.amazon.com/kms/latest/developerguide/importing-keys.html)
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specification.
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2021-06-29 17:31:25 +00:00
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## Key Rotation
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2022-01-13 18:41:05 +00:00
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AWS KMS keys with imported key material are not eligible for
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[automatic key rotation](https://docs.aws.amazon.com/kms/latest/developerguide/rotate-keys.html)
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within AWS KMS. As such, key rotations performed by the secrets engine use the
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[manual key rotation](https://docs.aws.amazon.com/kms/latest/developerguide/rotate-keys.html#rotate-keys-manually)
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process. Applications should refer to the [alias](https://docs.aws.amazon.com/kms/latest/developerguide/kms-alias.html)
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associated with imported keys. Aliases will always have the form: `hashicorp/<key_name>-<unix_timestamp>`.
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2021-11-16 19:27:08 +00:00
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## Key Purpose Compatability
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The following table defines which key [purposes](/api-docs/secret/key-management#purpose) can be used
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for each key type supported by AWS KMS.
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| Key Type | Purpose |
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| -------------- | ----------------------- |
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| `aes256-gcm96` | `encrypt` and `decrypt` |
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