Method: privatekeydecrypt

Unwraps a wrapped private key and then decrypts the content encryption key that is encrypted to the public key.

HTTP request

POST https://KACLS_URL/privatekeydecrypt

Replace KACLS_URL with the Key Access Control List Service (KACLS) URL.

Path parameters

None.

Request body

The request body contains data with the following structure:

JSON representation 
{
  "authentication": string,
  "authorization": string,
  "algorithm": string,
  "encrypted_data_encryption_key": string,
  "rsa_oaep_label": string,
  "reason": string,
  "wrapped_private_key": string
}
Fields
authentication

string

A JWT issued by the identity provider (IdP) asserting who the user is. See authentication tokens.
authorization

string

A JWT asserting that the user is allowed to unwrap a key for resource_name. See authorization tokens.
algorithm

string

The algorithm that was used to encrypt the Data Encryption Key (DEK) in envelope encryption.
encrypted_data_encryption_key

string (UTF-8)

Base64-encoded encrypted content encryption key, which is encrypted with the public key associated with the private key. Max size: 1 KB.
rsa_oaep_label

string

Base64-encoded label L, if the algorithm is RSAES-OAEP. If the algorithm is not RSAES-OAEP, this field is ignored.
reason

string (UTF-8)

A passthrough JSON string providing additional context about the operation. The JSON provided should be sanitized before being displayed. Max size: 1 KB.
wrapped_private_key

string

The base64-encoded wrapped private key. Max size: 8 KB.

The format of the private key or the wrapped private key is up to the Key Access Control List Service (KACLS) implementation. On the client and on the Gmail side, this is treated as an opaque blob.

Response body

If successful, this method returns a base64 data encryption key.

If the operation fails, a structured error reply is returned.

JSON representation 
{
  "data_encryption_key": string
}
Fields
data_encryption_key

string

A base64-encoded data encryption key.

Example

This example provides a sample request and response for the privatekeydecrypt method.

Request

POST https://mykacls.example.org/v1/privatekeydecrypt

{
  "wrapped_private_key": "wHrlNOTI9mU6PBdqiq7EQA...",
  "encrypted_data_encryption_key": "dGVzdCB3cmFwcGVkIGRlaw...",
  "authorization": "eyJhbGciOi...",
  "authentication": "eyJhbGciOi...",
  "algorithm": "RSA/ECB/PKCS1Padding",
  "reason": "decrypt"
}

Response

{
  "data_encryption_key": "akRQtv3nr+jUhcFL6JmKzB+WzUxbkkMyW5kQsqGUAFc="
}