Method: cryptoKeys.decrypt

HTTP request
Path parameters
Request body
- JSON representation
Response body
- JSON representation
Authorization scopes
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Full name: projects.locations.keyRings.cryptoKeys.decrypt

Decrypts data that was protected by cryptoKeys.encrypt . The CryptoKey.purpose must be ENCRYPT_DECRYPT .

HTTP request

Choose a location:

The URLs use gRPC Transcoding syntax.

Path parameters

Parameters

name

string

Required. The resource name of the CryptoKey to use for decryption. The server will choose the appropriate version.

Authorization requires the following IAM permission on the specified resource name :

cloudkms.cryptoKeyVersions.useToDecrypt

Request body

The request body contains data with the following structure:

JSON representation
{ "ciphertext" : string , "additionalAuthenticatedData" : string , "ciphertextCrc32c" : string , "additionalAuthenticatedDataCrc32c" : string }

Fields
`ciphertext`	`string ( bytes format)` Required. The encrypted data originally returned in `EncryptResponse.ciphertext` . A base64-encoded string.
`additionalAuthenticatedData`	`string ( bytes format)` Optional. Optional data that must match the data originally supplied in `EncryptRequest.additional_authenticated_data` . A base64-encoded string.
`ciphertextCrc32c`	`string ( Int64Value format)` Optional. An optional CRC32C checksum of the `DecryptRequest.ciphertext` . If specified, `KeyManagementService` will verify the integrity of the received `DecryptRequest.ciphertext` using this checksum. `KeyManagementService` will report an error if the checksum verification fails. If you receive a checksum error, your client should verify that CRC32C( `DecryptRequest.ciphertext` ) is equal to `DecryptRequest.ciphertext_crc32c` , and if so, perform a limited number of retries. A persistent mismatch may indicate an issue in your computation of the CRC32C checksum. Note: This field is defined as int64 for reasons of compatibility across different languages. However, it is a non-negative integer, which will never exceed 2^32-1, and can be safely downconverted to uint32 in languages that support this type.
`additionalAuthenticatedDataCrc32c`	`string ( Int64Value format)` Optional. An optional CRC32C checksum of the `DecryptRequest.additional_authenticated_data` . If specified, `KeyManagementService` will verify the integrity of the received `DecryptRequest.additional_authenticated_data` using this checksum. `KeyManagementService` will report an error if the checksum verification fails. If you receive a checksum error, your client should verify that CRC32C( `DecryptRequest.additional_authenticated_data` ) is equal to `DecryptRequest.additional_authenticated_data_crc32c` , and if so, perform a limited number of retries. A persistent mismatch may indicate an issue in your computation of the CRC32C checksum. Note: This field is defined as int64 for reasons of compatibility across different languages. However, it is a non-negative integer, which will never exceed 2^32-1, and can be safely downconverted to uint32 in languages that support this type.

Response body

Response message for KeyManagementService.Decrypt .

If successful, the response body contains data with the following structure:

JSON representation
{ "plaintext" : string , "plaintextCrc32c" : string , "usedPrimary" : boolean , "protectionLevel" : enum ( `ProtectionLevel` ) }

Fields
`plaintext`	`string ( bytes format)` The decrypted data originally supplied in `EncryptRequest.plaintext` . A base64-encoded string.
`plaintextCrc32c`	`string ( Int64Value format)` Integrity verification field. A CRC32C checksum of the returned `DecryptResponse.plaintext` . An integrity check of `DecryptResponse.plaintext` can be performed by computing the CRC32C checksum of `DecryptResponse.plaintext` and comparing your results to this field. Discard the response in case of non-matching checksum values, and perform a limited number of retries. A persistent mismatch may indicate an issue in your computation of the CRC32C checksum. Note: receiving this response message indicates that `KeyManagementService` is able to successfully decrypt the `ciphertext` . Note: This field is defined as int64 for reasons of compatibility across different languages. However, it is a non-negative integer, which will never exceed 2^32-1, and can be safely downconverted to uint32 in languages that support this type.
`usedPrimary`	`boolean` Whether the Decryption was performed using the primary key version.
`protectionLevel`	`enum ( ProtectionLevel )` The `ProtectionLevel` of the `CryptoKeyVersion` used in decryption.

Authorization scopes

Requires one of the following OAuth scopes:

https://www.googleapis.com/auth/cloudkms
https://www.googleapis.com/auth/cloud-platform

For more information, see the Authentication Overview .

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