Resource: CseIdentity
The client-side encryption (CSE) configuration for the email address of an authenticated user. Gmail uses CSE configurations to save drafts of client-side encrypted email messages, and to sign and send encrypted email messages.
For administrators managing identities and keypairs for users in their organization, requests require authorization with a service account 
that has domain-wide delegation authority 
to impersonate users with the https://www.googleapis.com/auth/gmail.settings.basic 
scope.
For users managing their own identities and keypairs, requests require hardware key encryption turned on and configured.
| JSON representation | 
|---|
| { "emailAddress" : string , // Union field | 
emailAddress 
 string 
The email address for the sending identity. The email address must be the primary email address of the authenticated user.
Union field key_pair_configuration 
.
 key_pair_configuration 
can be only one of the following:
primaryKeyPairId 
 string 
If a key pair is associated, the ID of the key pair,  CseKeyPair 
 
.
signAndEncryptKeyPairs 
 object (  
 SignAndEncryptKeyPairs 
 
)
The configuration of a CSE identity that uses different key pairs for signing and encryption.
SignAndEncryptKeyPairs
The configuration of a CSE identity that uses different key pairs for signing and encryption.
| JSON representation | 
|---|
| { "signingKeyPairId" : string , "encryptionKeyPairId" : string } | 
| Fields | |
|---|---|
| signingKeyPairId |   The ID of the  | 
| encryptionKeyPairId |   The ID of the  | 
| Methods | |
|---|---|
|   | Creates and configures a client-side encryption identity that's authorized to send mail from the user account. | 
|   | Deletes a client-side encryption identity. | 
|   | Retrieves a client-side encryption identity configuration. | 
|   | Lists the client-side encrypted identities for an authenticated user. | 
|   | Associates a different key pair with an existing client-side encryption identity. | 

