AWS Tools for Windows PowerShell
Command Reference

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Synopsis

Calls the AWS Key Management Service CreateKey API operation.

Syntax

New-KMSKey
-BypassPolicyLockoutSafetyCheck <Boolean>
-CustomerMasterKeySpec <CustomerMasterKeySpec>
-CustomKeyStoreId <String>
-Description <String>
-KeyUsage <KeyUsageType>
-Origin <OriginType>
-Policy <String>
-Tag <Tag[]>
-Select <String>
-Force <SwitchParameter>

Description

Creates a unique customer managed customer master key (CMK) in your AWS account and Region. You cannot use this operation to create a CMK in a different AWS account. You can use the CreateKey operation to create symmetric or asymmetric CMKs.
  • Symmetric CMKs contain a 256-bit symmetric key that never leaves AWS KMS unencrypted. To use the CMK, you must call AWS KMS. You can use a symmetric CMK to encrypt and decrypt small amounts of data, but they are typically used to generate data keys and data keys pairs. For details, see GenerateDataKey and GenerateDataKeyPair.
  • Asymmetric CMKs can contain an RSA key pair or an Elliptic Curve (ECC) key pair. The private key in an asymmetric CMK never leaves AWS KMS unencrypted. However, you can use the GetPublicKey operation to download the public key so it can be used outside of AWS KMS. CMKs with RSA key pairs can be used to encrypt or decrypt data or sign and verify messages (but not both). CMKs with ECC key pairs can be used only to sign and verify messages.
For information about symmetric and asymmetric CMKs, see Using Symmetric and Asymmetric CMKs in the AWS Key Management Service Developer Guide. To create different types of CMKs, use the following guidance:
Asymmetric CMKs
To create an asymmetric CMK, use the CustomerMasterKeySpec parameter to specify the type of key material in the CMK. Then, use the KeyUsage parameter to determine whether the CMK will be used to encrypt and decrypt or sign and verify. You can't change these properties after the CMK is created.
Symmetric CMKs
When creating a symmetric CMK, you don't need to specify the CustomerMasterKeySpec or KeyUsage parameters. The default value for CustomerMasterKeySpec, SYMMETRIC_DEFAULT, and the default value for KeyUsage, ENCRYPT_DECRYPT, are the only valid values for symmetric CMKs.
Imported Key Material
To import your own key material, begin by creating a symmetric CMK with no key material. To do this, use the Origin parameter of CreateKey with a value of EXTERNAL. Next, use GetParametersForImport operation to get a public key and import token, and use the public key to encrypt your key material. Then, use ImportKeyMaterial with your import token to import the key material. For step-by-step instructions, see Importing Key Material in the AWS Key Management Service Developer Guide. You cannot import the key material into an asymmetric CMK.
Custom Key Stores
To create a symmetric CMK in a custom key store, use the CustomKeyStoreId parameter to specify the custom key store. You must also use the Origin parameter with a value of AWS_CLOUDHSM. The AWS CloudHSM cluster that is associated with the custom key store must have at least two active HSMs in different Availability Zones in the AWS Region. You cannot create an asymmetric CMK in a custom key store. For information about custom key stores in AWS KMS see Using Custom Key Stores in the AWS Key Management Service Developer Guide.

Parameters

-BypassPolicyLockoutSafetyCheck <Boolean>
A flag to indicate whether to bypass the key policy lockout safety check.Setting this value to true increases the risk that the CMK becomes unmanageable. Do not set this value to true indiscriminately.For more information, refer to the scenario in the Default Key Policy section in the AWS Key Management Service Developer Guide.Use this parameter only when you include a policy in the request and you intend to prevent the principal that is making the request from making a subsequent PutKeyPolicy request on the CMK.The default value is false.
Required?False
Position?Named
Accept pipeline input?True (ByPropertyName)
-CustomerMasterKeySpec <CustomerMasterKeySpec>
Specifies the type of CMK to create. The default value, SYMMETRIC_DEFAULT, creates a CMK with a 256-bit symmetric key for encryption and decryption. For help choosing a key spec for your CMK, see How to Choose Your CMK Configuration in the AWS Key Management Service Developer Guide.The CustomerMasterKeySpec determines whether the CMK contains a symmetric key or an asymmetric key pair. It also determines the encryption algorithms or signing algorithms that the CMK supports. You can't change the CustomerMasterKeySpec after the CMK is created. To further restrict the algorithms that can be used with the CMK, use a condition key in its key policy or IAM policy. For more information, see kms:EncryptionAlgorithm or kms:Signing Algorithm in the AWS Key Management Service Developer Guide.AWS services that are integrated with AWS KMS use symmetric CMKs to protect your data. These services do not support asymmetric CMKs. For help determining whether a CMK is symmetric or asymmetric, see Identifying Symmetric and Asymmetric CMKs in the AWS Key Management Service Developer Guide.AWS KMS supports the following key specs for CMKs:
  • Symmetric key (default)
    • SYMMETRIC_DEFAULT (AES-256-GCM)
  • Asymmetric RSA key pairs
    • RSA_2048
    • RSA_3072
    • RSA_4096
  • Asymmetric NIST-recommended elliptic curve key pairs
    • ECC_NIST_P256 (secp256r1)
    • ECC_NIST_P384 (secp384r1)
    • ECC_NIST_P521 (secp521r1)
  • Other asymmetric elliptic curve key pairs
    • ECC_SECG_P256K1 (secp256k1), commonly used for cryptocurrencies.
Required?False
Position?Named
Accept pipeline input?True (ByPropertyName)
-CustomKeyStoreId <String>
Creates the CMK in the specified custom key store and the key material in its associated AWS CloudHSM cluster. To create a CMK in a custom key store, you must also specify the Origin parameter with a value of AWS_CLOUDHSM. The AWS CloudHSM cluster that is associated with the custom key store must have at least two active HSMs, each in a different Availability Zone in the Region.This parameter is valid only for symmetric CMKs. You cannot create an asymmetric CMK in a custom key store.To find the ID of a custom key store, use the DescribeCustomKeyStores operation.The response includes the custom key store ID and the ID of the AWS CloudHSM cluster.This operation is part of the Custom Key Store feature feature in AWS KMS, which combines the convenience and extensive integration of AWS KMS with the isolation and control of a single-tenant key store.
Required?False
Position?Named
Accept pipeline input?True (ByPropertyName)
-Description <String>
A description of the CMK.Use a description that helps you decide whether the CMK is appropriate for a task.
Required?False
Position?Named
Accept pipeline input?True (ByPropertyName)
This parameter overrides confirmation prompts to force the cmdlet to continue its operation. This parameter should always be used with caution.
Required?False
Position?Named
Accept pipeline input?True (ByPropertyName)
-KeyUsage <KeyUsageType>
Determines the cryptographic operations for which you can use the CMK. The default value is ENCRYPT_DECRYPT. This parameter is required only for asymmetric CMKs. You can't change the KeyUsage value after the CMK is created.Select only one valid value.
  • For symmetric CMKs, omit the parameter or specify ENCRYPT_DECRYPT.
  • For asymmetric CMKs with RSA key material, specify ENCRYPT_DECRYPT or SIGN_VERIFY.
  • For asymmetric CMKs with ECC key material, specify SIGN_VERIFY.
Required?False
Position?Named
Accept pipeline input?True (ByPropertyName)
-Origin <OriginType>
The source of the key material for the CMK. You cannot change the origin after you create the CMK. The default is AWS_KMS, which means AWS KMS creates the key material.When the parameter value is EXTERNAL, AWS KMS creates a CMK without key material so that you can import key material from your existing key management infrastructure. For more information about importing key material into AWS KMS, see Importing Key Material in the AWS Key Management Service Developer Guide. This value is valid only for symmetric CMKs.When the parameter value is AWS_CLOUDHSM, AWS KMS creates the CMK in an AWS KMS custom key store and creates its key material in the associated AWS CloudHSM cluster. You must also use the CustomKeyStoreId parameter to identify the custom key store. This value is valid only for symmetric CMKs.
Required?False
Position?Named
Accept pipeline input?True (ByPropertyName)
-Policy <String>
The key policy to attach to the CMK.If you provide a key policy, it must meet the following criteria:
  • If you don't set BypassPolicyLockoutSafetyCheck to true, the key policy must allow the principal that is making the CreateKey request to make a subsequent PutKeyPolicy request on the CMK. This reduces the risk that the CMK becomes unmanageable. For more information, refer to the scenario in the Default Key Policy section of the AWS Key Management Service Developer Guide.
  • Each statement in the key policy must contain one or more principals. The principals in the key policy must exist and be visible to AWS KMS. When you create a new AWS principal (for example, an IAM user or role), you might need to enforce a delay before including the new principal in a key policy because the new principal might not be immediately visible to AWS KMS. For more information, see Changes that I make are not always immediately visible in the AWS Identity and Access Management User Guide.
If you do not provide a key policy, AWS KMS attaches a default key policy to the CMK. For more information, see Default Key Policy in the AWS Key Management Service Developer Guide.The key policy size quota is 32 kilobytes (32768 bytes).
Required?False
Position?Named
Accept pipeline input?True (ByPropertyName)
-Select <String>
Use the -Select parameter to control the cmdlet output. The default value is 'KeyMetadata'. Specifying -Select '*' will result in the cmdlet returning the whole service response (Amazon.KeyManagementService.Model.CreateKeyResponse). Specifying the name of a property of type Amazon.KeyManagementService.Model.CreateKeyResponse will result in that property being returned. Specifying -Select '^ParameterName' will result in the cmdlet returning the selected cmdlet parameter value.
Required?False
Position?Named
Accept pipeline input?True (ByPropertyName)
-Tag <Tag[]>
One or more tags. Each tag consists of a tag key and a tag value. Both the tag key and the tag value are required, but the tag value can be an empty (null) string.When you add tags to an AWS resource, AWS generates a cost allocation report with usage and costs aggregated by tags. For information about adding, changing, deleting and listing tags for CMKs, see Tagging Keys.Use this parameter to tag the CMK when it is created. To add tags to an existing CMK, use the TagResource operation.
Required?False
Position?Named
Accept pipeline input?True (ByPropertyName)
AliasesTags

Common Credential and Region Parameters

-AccessKey <String>
The AWS access key for the user account. This can be a temporary access key if the corresponding session token is supplied to the -SessionToken parameter.
Required?False
Position?Named
Accept pipeline input?True (ByPropertyName)
AliasesAK
-Credential <AWSCredentials>
An AWSCredentials object instance containing access and secret key information, and optionally a token for session-based credentials.
Required?False
Position?Named
Accept pipeline input?True (ByValue, ByPropertyName)
-EndpointUrl <String>
The endpoint to make the call against.Note: This parameter is primarily for internal AWS use and is not required/should not be specified for normal usage. The cmdlets normally determine which endpoint to call based on the region specified to the -Region parameter or set as default in the shell (via Set-DefaultAWSRegion). Only specify this parameter if you must direct the call to a specific custom endpoint.
Required?False
Position?Named
Accept pipeline input?True (ByPropertyName)
-NetworkCredential <PSCredential>
Used with SAML-based authentication when ProfileName references a SAML role profile. Contains the network credentials to be supplied during authentication with the configured identity provider's endpoint. This parameter is not required if the user's default network identity can or should be used during authentication.
Required?False
Position?Named
Accept pipeline input?True (ByValue, ByPropertyName)
-ProfileLocation <String>
Used to specify the name and location of the ini-format credential file (shared with the AWS CLI and other AWS SDKs)If this optional parameter is omitted this cmdlet will search the encrypted credential file used by the AWS SDK for .NET and AWS Toolkit for Visual Studio first. If the profile is not found then the cmdlet will search in the ini-format credential file at the default location: (user's home directory)\.aws\credentials.If this parameter is specified then this cmdlet will only search the ini-format credential file at the location given.As the current folder can vary in a shell or during script execution it is advised that you use specify a fully qualified path instead of a relative path.
Required?False
Position?Named
Accept pipeline input?True (ByPropertyName)
AliasesAWSProfilesLocation, ProfilesLocation
-ProfileName <String>
The user-defined name of an AWS credentials or SAML-based role profile containing credential information. The profile is expected to be found in the secure credential file shared with the AWS SDK for .NET and AWS Toolkit for Visual Studio. You can also specify the name of a profile stored in the .ini-format credential file used with the AWS CLI and other AWS SDKs.
Required?False
Position?Named
Accept pipeline input?True (ByPropertyName)
AliasesStoredCredentials, AWSProfileName
-Region <Object>
The system name of an AWS region or an AWSRegion instance. This governs the endpoint that will be used when calling service operations. Note that the AWS resources referenced in a call are usually region-specific.
Required?False
Position?Named
Accept pipeline input?True (ByPropertyName)
AliasesRegionToCall
-SecretKey <String>
The AWS secret key for the user account. This can be a temporary secret key if the corresponding session token is supplied to the -SessionToken parameter.
Required?False
Position?Named
Accept pipeline input?True (ByPropertyName)
AliasesSK, SecretAccessKey
-SessionToken <String>
The session token if the access and secret keys are temporary session-based credentials.
Required?False
Position?Named
Accept pipeline input?True (ByPropertyName)
AliasesST

Outputs

This cmdlet returns an Amazon.KeyManagementService.Model.KeyMetadata object. The service call response (type Amazon.KeyManagementService.Model.CreateKeyResponse) can also be referenced from properties attached to the cmdlet entry in the $AWSHistory stack.

Supported Version

AWS Tools for PowerShell: 2.x.y.z