| Copyright | (c) 2013-2021 Brendan Hay |
|---|---|
| License | Mozilla Public License, v. 2.0. |
| Maintainer | Brendan Hay <brendan.g.hay+amazonka@gmail.com> |
| Stability | auto-generated |
| Portability | non-portable (GHC extensions) |
| Safe Haskell | None |
Amazonka.KMS.GenerateDataKeyWithoutPlaintext
Description
Generates a unique symmetric data key. This operation returns a data key that is encrypted under a KMS key that you specify. To request an asymmetric data key pair, use the GenerateDataKeyPair or GenerateDataKeyPairWithoutPlaintext operations.
GenerateDataKeyWithoutPlaintext is identical to the GenerateDataKey
operation except that returns only the encrypted copy of the data key.
This operation is useful for systems that need to encrypt data at some
point, but not immediately. When you need to encrypt the data, you call
the Decrypt operation on the encrypted copy of the key.
It's also useful in distributed systems with different levels of trust. For example, you might store encrypted data in containers. One component of your system creates new containers and stores an encrypted data key with each container. Then, a different component puts the data into the containers. That component first decrypts the data key, uses the plaintext data key to encrypt data, puts the encrypted data into the container, and then destroys the plaintext data key. In this system, the component that creates the containers never sees the plaintext data key.
GenerateDataKeyWithoutPlaintext returns a unique data key for each
request. The bytes in the keys are not related to the caller or KMS key
that is used to encrypt the private key.
To generate a data key, you must specify the symmetric KMS key that is used to encrypt the data key. You cannot use an asymmetric KMS key to generate a data key. To get the type of your KMS key, use the DescribeKey operation.
If the operation succeeds, you will find the encrypted copy of the data
key in the CiphertextBlob field.
You can use the optional encryption context to add additional security
to the encryption operation. If you specify an EncryptionContext, you
must specify the same encryption context (a case-sensitive exact match)
when decrypting the encrypted data key. Otherwise, the request to
decrypt fails with an InvalidCiphertextException. For more
information, see
Encryption Context
in the Key Management Service Developer Guide.
The KMS key that you use for this operation must be in a compatible key state. For details, see Key state: Effect on your KMS key in the Key Management Service Developer Guide.
Cross-account use: Yes. To perform this operation with a KMS key in
a different Amazon Web Services account, specify the key ARN or alias
ARN in the value of the KeyId parameter.
Required permissions: kms:GenerateDataKeyWithoutPlaintext (key policy)
Related operations:
- Decrypt
- Encrypt
- GenerateDataKey
- GenerateDataKeyPair
- GenerateDataKeyPairWithoutPlaintext
Synopsis
- data GenerateDataKeyWithoutPlaintext = GenerateDataKeyWithoutPlaintext' {
- keySpec :: Maybe DataKeySpec
- encryptionContext :: Maybe (HashMap Text Text)
- numberOfBytes :: Maybe Natural
- grantTokens :: Maybe [Text]
- keyId :: Text
- newGenerateDataKeyWithoutPlaintext :: Text -> GenerateDataKeyWithoutPlaintext
- generateDataKeyWithoutPlaintext_keySpec :: Lens' GenerateDataKeyWithoutPlaintext (Maybe DataKeySpec)
- generateDataKeyWithoutPlaintext_encryptionContext :: Lens' GenerateDataKeyWithoutPlaintext (Maybe (HashMap Text Text))
- generateDataKeyWithoutPlaintext_numberOfBytes :: Lens' GenerateDataKeyWithoutPlaintext (Maybe Natural)
- generateDataKeyWithoutPlaintext_grantTokens :: Lens' GenerateDataKeyWithoutPlaintext (Maybe [Text])
- generateDataKeyWithoutPlaintext_keyId :: Lens' GenerateDataKeyWithoutPlaintext Text
- data GenerateDataKeyWithoutPlaintextResponse = GenerateDataKeyWithoutPlaintextResponse' {
- keyId :: Maybe Text
- ciphertextBlob :: Maybe Base64
- httpStatus :: Int
- newGenerateDataKeyWithoutPlaintextResponse :: Int -> GenerateDataKeyWithoutPlaintextResponse
- generateDataKeyWithoutPlaintextResponse_keyId :: Lens' GenerateDataKeyWithoutPlaintextResponse (Maybe Text)
- generateDataKeyWithoutPlaintextResponse_ciphertextBlob :: Lens' GenerateDataKeyWithoutPlaintextResponse (Maybe ByteString)
- generateDataKeyWithoutPlaintextResponse_httpStatus :: Lens' GenerateDataKeyWithoutPlaintextResponse Int
Creating a Request
data GenerateDataKeyWithoutPlaintext Source #
See: newGenerateDataKeyWithoutPlaintext smart constructor.
Constructors
| GenerateDataKeyWithoutPlaintext' | |
Fields
| |
Instances
newGenerateDataKeyWithoutPlaintext Source #
Create a value of GenerateDataKeyWithoutPlaintext with all optional fields omitted.
Use generic-lens or optics to modify other optional fields.
The following record fields are available, with the corresponding lenses provided for backwards compatibility:
$sel:keySpec:GenerateDataKeyWithoutPlaintext', generateDataKeyWithoutPlaintext_keySpec - The length of the data key. Use AES_128 to generate a 128-bit
symmetric key, or AES_256 to generate a 256-bit symmetric key.
$sel:encryptionContext:GenerateDataKeyWithoutPlaintext', generateDataKeyWithoutPlaintext_encryptionContext - Specifies the encryption context that will be used when encrypting the
data key.
An encryption context is a collection of non-secret key-value pairs that represents additional authenticated data. When you use an encryption context to encrypt data, you must specify the same (an exact case-sensitive match) encryption context to decrypt the data. An encryption context is optional when encrypting with a symmetric KMS key, but it is highly recommended.
For more information, see Encryption Context in the Key Management Service Developer Guide.
$sel:numberOfBytes:GenerateDataKeyWithoutPlaintext', generateDataKeyWithoutPlaintext_numberOfBytes - The length of the data key in bytes. For example, use the value 64 to
generate a 512-bit data key (64 bytes is 512 bits). For common key
lengths (128-bit and 256-bit symmetric keys), we recommend that you use
the KeySpec field instead of this one.
$sel:grantTokens:GenerateDataKeyWithoutPlaintext', generateDataKeyWithoutPlaintext_grantTokens - A list of grant tokens.
Use a grant token when your permission to call this operation comes from a new grant that has not yet achieved eventual consistency. For more information, see Grant token and Using a grant token in the Key Management Service Developer Guide.
$sel:keyId:GenerateDataKeyWithoutPlaintext', generateDataKeyWithoutPlaintext_keyId - The identifier of the symmetric KMS key that encrypts the data key.
To specify a KMS key, use its key ID, key ARN, alias name, or alias ARN.
When using an alias name, prefix it with "alias/". To specify a KMS
key in a different Amazon Web Services account, you must use the key ARN
or alias ARN.
For example:
- Key ID:
1234abcd-12ab-34cd-56ef-1234567890ab - Key ARN:
arn:aws:kms:us-east-2:111122223333:key/1234abcd-12ab-34cd-56ef-1234567890ab - Alias name:
alias/ExampleAlias - Alias ARN:
arn:aws:kms:us-east-2:111122223333:alias/ExampleAlias
To get the key ID and key ARN for a KMS key, use ListKeys or DescribeKey. To get the alias name and alias ARN, use ListAliases.
Request Lenses
generateDataKeyWithoutPlaintext_keySpec :: Lens' GenerateDataKeyWithoutPlaintext (Maybe DataKeySpec) Source #
The length of the data key. Use AES_128 to generate a 128-bit
symmetric key, or AES_256 to generate a 256-bit symmetric key.
generateDataKeyWithoutPlaintext_encryptionContext :: Lens' GenerateDataKeyWithoutPlaintext (Maybe (HashMap Text Text)) Source #
Specifies the encryption context that will be used when encrypting the data key.
An encryption context is a collection of non-secret key-value pairs that represents additional authenticated data. When you use an encryption context to encrypt data, you must specify the same (an exact case-sensitive match) encryption context to decrypt the data. An encryption context is optional when encrypting with a symmetric KMS key, but it is highly recommended.
For more information, see Encryption Context in the Key Management Service Developer Guide.
generateDataKeyWithoutPlaintext_numberOfBytes :: Lens' GenerateDataKeyWithoutPlaintext (Maybe Natural) Source #
The length of the data key in bytes. For example, use the value 64 to
generate a 512-bit data key (64 bytes is 512 bits). For common key
lengths (128-bit and 256-bit symmetric keys), we recommend that you use
the KeySpec field instead of this one.
generateDataKeyWithoutPlaintext_grantTokens :: Lens' GenerateDataKeyWithoutPlaintext (Maybe [Text]) Source #
A list of grant tokens.
Use a grant token when your permission to call this operation comes from a new grant that has not yet achieved eventual consistency. For more information, see Grant token and Using a grant token in the Key Management Service Developer Guide.
generateDataKeyWithoutPlaintext_keyId :: Lens' GenerateDataKeyWithoutPlaintext Text Source #
The identifier of the symmetric KMS key that encrypts the data key.
To specify a KMS key, use its key ID, key ARN, alias name, or alias ARN.
When using an alias name, prefix it with "alias/". To specify a KMS
key in a different Amazon Web Services account, you must use the key ARN
or alias ARN.
For example:
- Key ID:
1234abcd-12ab-34cd-56ef-1234567890ab - Key ARN:
arn:aws:kms:us-east-2:111122223333:key/1234abcd-12ab-34cd-56ef-1234567890ab - Alias name:
alias/ExampleAlias - Alias ARN:
arn:aws:kms:us-east-2:111122223333:alias/ExampleAlias
To get the key ID and key ARN for a KMS key, use ListKeys or DescribeKey. To get the alias name and alias ARN, use ListAliases.
Destructuring the Response
data GenerateDataKeyWithoutPlaintextResponse Source #
See: newGenerateDataKeyWithoutPlaintextResponse smart constructor.
Constructors
| GenerateDataKeyWithoutPlaintextResponse' | |
Fields
| |
Instances
newGenerateDataKeyWithoutPlaintextResponse Source #
Arguments
| :: Int | |
| -> GenerateDataKeyWithoutPlaintextResponse |
Create a value of GenerateDataKeyWithoutPlaintextResponse with all optional fields omitted.
Use generic-lens or optics to modify other optional fields.
The following record fields are available, with the corresponding lenses provided for backwards compatibility:
$sel:keyId:GenerateDataKeyWithoutPlaintext', generateDataKeyWithoutPlaintextResponse_keyId - The Amazon Resource Name
(key ARN)
of the KMS key that encrypted the data key.
$sel:ciphertextBlob:GenerateDataKeyWithoutPlaintextResponse', generateDataKeyWithoutPlaintextResponse_ciphertextBlob - The encrypted data key. When you use the HTTP API or the Amazon Web
Services CLI, the value is Base64-encoded. Otherwise, it is not
Base64-encoded.--
-- Note: This Lens automatically encodes and decodes Base64 data.
-- The underlying isomorphism will encode to Base64 representation during
-- serialisation, and decode from Base64 representation during deserialisation.
-- This Lens accepts and returns only raw unencoded data.
$sel:httpStatus:GenerateDataKeyWithoutPlaintextResponse', generateDataKeyWithoutPlaintextResponse_httpStatus - The response's http status code.
Response Lenses
generateDataKeyWithoutPlaintextResponse_keyId :: Lens' GenerateDataKeyWithoutPlaintextResponse (Maybe Text) Source #
The Amazon Resource Name (key ARN) of the KMS key that encrypted the data key.
generateDataKeyWithoutPlaintextResponse_ciphertextBlob :: Lens' GenerateDataKeyWithoutPlaintextResponse (Maybe ByteString) Source #
The encrypted data key. When you use the HTTP API or the Amazon Web
Services CLI, the value is Base64-encoded. Otherwise, it is not
Base64-encoded.--
-- Note: This Lens automatically encodes and decodes Base64 data.
-- The underlying isomorphism will encode to Base64 representation during
-- serialisation, and decode from Base64 representation during deserialisation.
-- This Lens accepts and returns only raw unencoded data.
generateDataKeyWithoutPlaintextResponse_httpStatus :: Lens' GenerateDataKeyWithoutPlaintextResponse Int Source #
The response's http status code.