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 |
Encrypts plaintext into ciphertext by using a KMS key. The Encrypt
operation has two primary use cases:
- You can encrypt small amounts of arbitrary data, such as a personal identifier or database password, or other sensitive information.
- You can use the
Encrypt
operation to move encrypted data from one Amazon Web Services Region to another. For example, in Region A, generate a data key and use the plaintext key to encrypt your data. Then, in Region A, use theEncrypt
operation to encrypt the plaintext data key under a KMS key in Region B. Now, you can move the encrypted data and the encrypted data key to Region B. When necessary, you can decrypt the encrypted data key and the encrypted data entirely within in Region B.
You don't need to use the Encrypt
operation to encrypt a data key.
The GenerateDataKey and GenerateDataKeyPair operations return a
plaintext data key and an encrypted copy of that data key.
When you encrypt data, you must specify a symmetric or asymmetric KMS
key to use in the encryption operation. The KMS key must have a
KeyUsage
value of ENCRYPT_DECRYPT.
To find the KeyUsage
of a KMS
key, use the DescribeKey operation.
If you use a symmetric KMS key, you can use an encryption context to add
additional security to your encryption operation. If you specify an
EncryptionContext
when encrypting data, you must specify the same
encryption context (a case-sensitive exact match) when decrypting the
data. Otherwise, the request to decrypt fails with an
InvalidCiphertextException
. For more information, see
Encryption Context
in the Key Management Service Developer Guide.
If you specify an asymmetric KMS key, you must also specify the encryption algorithm. The algorithm must be compatible with the KMS key type.
When you use an asymmetric KMS key to encrypt or reencrypt data, be sure to record the KMS key and encryption algorithm that you choose. You will be required to provide the same KMS key and encryption algorithm when you decrypt the data. If the KMS key and algorithm do not match the values used to encrypt the data, the decrypt operation fails.
You are not required to supply the key ID and encryption algorithm when you decrypt with symmetric KMS keys because KMS stores this information in the ciphertext blob. KMS cannot store metadata in ciphertext generated with asymmetric keys. The standard format for asymmetric key ciphertext does not include configurable fields.
The maximum size of the data that you can encrypt varies with the type of KMS key and the encryption algorithm that you choose.
Symmetric KMS keys
SYMMETRIC_DEFAULT
: 4096 bytes
RSA_2048
RSAES_OAEP_SHA_1
: 214 bytesRSAES_OAEP_SHA_256
: 190 bytes
RSA_3072
RSAES_OAEP_SHA_1
: 342 bytesRSAES_OAEP_SHA_256
: 318 bytes
RSA_4096
RSAES_OAEP_SHA_1
: 470 bytesRSAES_OAEP_SHA_256
: 446 bytes
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:Encrypt (key policy)
Related operations:
- Decrypt
- GenerateDataKey
- GenerateDataKeyPair
Synopsis
- data Encrypt = Encrypt' {}
- newEncrypt :: Text -> ByteString -> Encrypt
- encrypt_encryptionContext :: Lens' Encrypt (Maybe (HashMap Text Text))
- encrypt_grantTokens :: Lens' Encrypt (Maybe [Text])
- encrypt_encryptionAlgorithm :: Lens' Encrypt (Maybe EncryptionAlgorithmSpec)
- encrypt_keyId :: Lens' Encrypt Text
- encrypt_plaintext :: Lens' Encrypt ByteString
- data EncryptResponse = EncryptResponse' {}
- newEncryptResponse :: Int -> EncryptResponse
- encryptResponse_keyId :: Lens' EncryptResponse (Maybe Text)
- encryptResponse_encryptionAlgorithm :: Lens' EncryptResponse (Maybe EncryptionAlgorithmSpec)
- encryptResponse_ciphertextBlob :: Lens' EncryptResponse (Maybe ByteString)
- encryptResponse_httpStatus :: Lens' EncryptResponse Int
Creating a Request
See: newEncrypt
smart constructor.
Encrypt' | |
|
Instances
Create a value of Encrypt
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:encryptionContext:Encrypt'
, encrypt_encryptionContext
- Specifies the encryption context that will be used to encrypt the data.
An encryption context is valid only for
cryptographic operations
with a symmetric KMS key. The standard asymmetric encryption algorithms
that KMS uses do not support an encryption context.
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:grantTokens:Encrypt'
, encrypt_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:encryptionAlgorithm:Encrypt'
, encrypt_encryptionAlgorithm
- Specifies the encryption algorithm that KMS will use to encrypt the
plaintext message. The algorithm must be compatible with the KMS key
that you specify.
This parameter is required only for asymmetric KMS keys. The default
value, SYMMETRIC_DEFAULT
, is the algorithm used for symmetric KMS
keys. If you are using an asymmetric KMS key, we recommend
RSAES_OAEP_SHA_256.
$sel:keyId:Encrypt'
, encrypt_keyId
- Identifies the KMS key to use in the encryption operation.
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.
$sel:plaintext:Encrypt'
, encrypt_plaintext
- Data to be encrypted.--
-- 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.
Request Lenses
encrypt_encryptionContext :: Lens' Encrypt (Maybe (HashMap Text Text)) Source #
Specifies the encryption context that will be used to encrypt the data. An encryption context is valid only for cryptographic operations with a symmetric KMS key. The standard asymmetric encryption algorithms that KMS uses do not support an encryption context.
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.
encrypt_grantTokens :: Lens' Encrypt (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.
encrypt_encryptionAlgorithm :: Lens' Encrypt (Maybe EncryptionAlgorithmSpec) Source #
Specifies the encryption algorithm that KMS will use to encrypt the plaintext message. The algorithm must be compatible with the KMS key that you specify.
This parameter is required only for asymmetric KMS keys. The default
value, SYMMETRIC_DEFAULT
, is the algorithm used for symmetric KMS
keys. If you are using an asymmetric KMS key, we recommend
RSAES_OAEP_SHA_256.
encrypt_keyId :: Lens' Encrypt Text Source #
Identifies the KMS key to use in the encryption operation.
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.
encrypt_plaintext :: Lens' Encrypt ByteString Source #
Data to be encrypted.--
-- 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.
Destructuring the Response
data EncryptResponse Source #
See: newEncryptResponse
smart constructor.
EncryptResponse' | |
|
Instances
Create a value of EncryptResponse
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:Encrypt'
, encryptResponse_keyId
- The Amazon Resource Name
(key ARN)
of the KMS key that was used to encrypt the plaintext.
$sel:encryptionAlgorithm:Encrypt'
, encryptResponse_encryptionAlgorithm
- The encryption algorithm that was used to encrypt the plaintext.
$sel:ciphertextBlob:EncryptResponse'
, encryptResponse_ciphertextBlob
- The encrypted plaintext. 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:EncryptResponse'
, encryptResponse_httpStatus
- The response's http status code.
Response Lenses
encryptResponse_keyId :: Lens' EncryptResponse (Maybe Text) Source #
The Amazon Resource Name (key ARN) of the KMS key that was used to encrypt the plaintext.
encryptResponse_encryptionAlgorithm :: Lens' EncryptResponse (Maybe EncryptionAlgorithmSpec) Source #
The encryption algorithm that was used to encrypt the plaintext.
encryptResponse_ciphertextBlob :: Lens' EncryptResponse (Maybe ByteString) Source #
The encrypted plaintext. 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.
encryptResponse_httpStatus :: Lens' EncryptResponse Int Source #
The response's http status code.