Decrypts ciphertext and then reencrypts it entirely within KMS. You can use this operation to change the KMS key under which data is encrypted, such as when you manually rotate a KMS key or change the KMS key that protects a ciphertext. You can also use it to reencrypt ciphertext under the same KMS key, such as to change the encryption context of a ciphertext.
See https://www.paws-r-sdk.com/docs/kms_re_encrypt/ for full documentation.
kms_re_encrypt(
CiphertextBlob,
SourceEncryptionContext = NULL,
SourceKeyId = NULL,
DestinationKeyId,
DestinationEncryptionContext = NULL,
SourceEncryptionAlgorithm = NULL,
DestinationEncryptionAlgorithm = NULL,
GrantTokens = NULL,
DryRun = NULL
)[required] Ciphertext of the data to reencrypt.
Specifies the encryption context to use to decrypt the ciphertext. Enter the same encryption context that was used to encrypt the ciphertext.
An encryption context is a collection of non-secret key-value pairs that represent 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 supported only on operations with symmetric encryption KMS keys. On operations with symmetric encryption KMS keys, an encryption context is optional, but it is strongly recommended.
For more information, see Encryption context in the Key Management Service Developer Guide.
Specifies the KMS key that KMS will use to decrypt the ciphertext before it is re-encrypted.
Enter a key ID of the KMS key that was used to encrypt the ciphertext.
If you identify a different KMS key, the re_encrypt
operation throws an IncorrectKeyException.
This parameter is required only when the ciphertext was encrypted under an asymmetric KMS key. If you used a symmetric encryption KMS key, KMS can get the KMS key from metadata that it adds to the symmetric ciphertext blob. However, it is always recommended as a best practice. This practice ensures that you use the KMS key that you intend.
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
list_keys or describe_key. To
get the alias name and alias ARN, use
list_aliases.
[required] A unique identifier for the KMS key that is used to reencrypt the data.
Specify a symmetric encryption KMS key or an asymmetric KMS key with a
KeyUsage value of ENCRYPT_DECRYPT. To find the KeyUsage value of a
KMS key, use the describe_key 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
list_keys or describe_key. To
get the alias name and alias ARN, use
list_aliases.
Specifies that encryption context to use when the reencrypting the data.
Do not include confidential or sensitive information in this field. This field may be displayed in plaintext in CloudTrail logs and other output.
A destination encryption context is valid only when the destination KMS key is a symmetric encryption KMS key. The standard ciphertext format for asymmetric KMS keys does not include fields for metadata.
An encryption context is a collection of non-secret key-value pairs that represent 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 supported only on operations with symmetric encryption KMS keys. On operations with symmetric encryption KMS keys, an encryption context is optional, but it is strongly recommended.
For more information, see Encryption context in the Key Management Service Developer Guide.
Specifies the encryption algorithm that KMS will use to decrypt the
ciphertext before it is reencrypted. The default value,
SYMMETRIC_DEFAULT, represents the algorithm used for symmetric
encryption KMS keys.
Specify the same algorithm that was used to encrypt the ciphertext. If you specify a different algorithm, the decrypt attempt fails.
This parameter is required only when the ciphertext was encrypted under an asymmetric KMS key.
Specifies the encryption algorithm that KMS will use to reecrypt the
data after it has decrypted it. The default value, SYMMETRIC_DEFAULT,
represents the encryption algorithm used for symmetric encryption KMS
keys.
This parameter is required only when the destination KMS key is an asymmetric KMS key.
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.
Checks if your request will succeed. DryRun is an optional parameter.
To learn more about how to use this parameter, see Testing your KMS API calls in the Key Management Service Developer Guide.