kms_decrypt: Decrypts ciphertext that was encrypted by a KMS key using any...

In paws.security.identity: 'Amazon Web Services' Security, Identity, & Compliance Services

Decrypts ciphertext that was encrypted by a KMS key using any of the following operations:

Description

Decrypts ciphertext that was encrypted by a KMS key using any of the following operations:

See https://www.paws-r-sdk.com/docs/kms_decrypt/ for full documentation.

Usage

kms_decrypt(
  CiphertextBlob = NULL,
  EncryptionContext = NULL,
  GrantTokens = NULL,
  KeyId = NULL,
  EncryptionAlgorithm = NULL,
  Recipient = NULL,
  DryRun = NULL,
  DryRunModifiers = NULL
)

Arguments

CiphertextBlob	Ciphertext to be decrypted. The blob includes metadata. This parameter is required in all cases except when DryRun is true and DryRunModifiers is set to IGNORE_CIPHERTEXT.
EncryptionContext	Specifies the encryption context to use when decrypting the data. An encryption context is valid only for cryptographic operations with a symmetric encryption KMS key. The standard asymmetric encryption algorithms and HMAC algorithms that KMS uses do not support an encryption context. 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.
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.
KeyId	Specifies the KMS key that KMS uses to decrypt the ciphertext. Enter a key ID of the KMS key that was used to encrypt the ciphertext. If you identify a different KMS key, the decrypt operation throws an IncorrectKeyException. This parameter is required only when the ciphertext was encrypted under an asymmetric KMS key or when DryRun is true and DryRunModifiers is set to IGNORE_CIPHERTEXT. 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 should 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.
EncryptionAlgorithm	Specifies the encryption algorithm that will be used to decrypt the ciphertext. Specify the same algorithm that was used to encrypt the data. If you specify a different algorithm, the decrypt operation fails. This parameter is required only when the ciphertext was encrypted under an asymmetric KMS key. The default value, SYMMETRIC_DEFAULT, represents the only supported algorithm that is valid for symmetric encryption KMS keys.
Recipient	A signed attestation document from an Amazon Web Services Nitro enclave or NitroTPM, and the encryption algorithm to use with the public key in the attestation document. The only valid encryption algorithm is RSAES_OAEP_SHA_256. This parameter supports the Amazon Web Services Nitro Enclaves SDK or any Amazon Web Services SDK for Amazon Web Services Nitro Enclaves. It supports any Amazon Web Services SDK for Amazon Web Services NitroTPM. When you use this parameter, instead of returning the plaintext data, KMS encrypts the plaintext data with the public key in the attestation document, and returns the resulting ciphertext in the CiphertextForRecipient field in the response. This ciphertext can be decrypted only with the private key in the attested environment. The Plaintext field in the response is null or empty. For information about the interaction between KMS and Amazon Web Services Nitro Enclaves or Amazon Web Services NitroTPM, see Cryptographic attestation support in KMS in the Key Management Service Developer Guide.
DryRun	Checks if your request will succeed. DryRun is an optional parameter. To learn more about how to use this parameter, see Testing your permissions in the Key Management Service Developer Guide.
DryRunModifiers	Specifies the modifiers to apply to the dry run operation. DryRunModifiers is an optional parameter that only applies when DryRun is set to true. When set to IGNORE_CIPHERTEXT, KMS performs only authorization validation without ciphertext validation. This allows you to test permissions without requiring a valid ciphertext blob. To learn more about how to use this parameter, see Testing your permissions in the Key Management Service Developer Guide.

paws.security.identity documentation built on May 31, 2026, 9:07 a.m.