WritableIdentityCredential

Kotlin |Java

public abstract class WritableIdentityCredential
extends Object

java.lang.Object
↳	android.security.identity.WritableIdentityCredential

Class used to personalize a new identity credential.

Credentials cannot be updated or modified after creation; any changes require deletion and re-creation. Use IdentityCredentialStore.createCredential(String, String) to create a new credential.

Summary

Public methods
`abstract Collection<X509Certificate>`	`getCredentialKeyCertificateChain(byte[] challenge)` Generates and returns an X.509 certificate chain for the CredentialKey which identifies this credential to the issuing authority.
`abstract byte[]`	`personalize(PersonalizationData personalizationData)` Stores all of the data in the credential, with the specified access control profiles.

Inherited methods

From class


        
          java.lang.Object

`Object`	`clone()` Creates and returns a copy of this object.
`boolean`	`equals(Object obj)` Indicates whether some other object is "equal to" this one.
`void`	`finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`final Class<?>`	`getClass()` Returns the runtime class of this `Object`.
`int`	`hashCode()` Returns a hash code value for the object.
`final void`	`notify()` Wakes up a single thread that is waiting on this object's monitor.
`final void`	`notifyAll()` Wakes up all threads that are waiting on this object's monitor.
`String`	`toString()` Returns a string representation of the object.
`final void`	`wait(long timeoutMillis, int nanos)` Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.
`final void`	`wait(long timeoutMillis)` Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.
`final void`	`wait()` Causes the current thread to wait until it is awakened, typically by being notified or interrupted.

Public methods

getCredentialKeyCertificateChain

Added in API level 30

public abstract Collection<X509Certificate> getCredentialKeyCertificateChain (byte[] challenge)

Generates and returns an X.509 certificate chain for the CredentialKey which identifies this credential to the issuing authority. The certificate contains an Android Keystore attestation extension which describes the key and the security hardware in which it lives.

Additionally, the attestation extension will contain the tag Tag::IDENTITY_CREDENTIAL_KEY which indicates it is an Identity Credential key (which can only sign/MAC very specific messages) and not an Android Keystore key (which can be used to sign/MAC anything).

The issuer MUST carefully examine this certificate chain including (but not limited to) checking that the root certificate is well-known, the tag Tag::IDENTITY_CREDENTIAL_KEY present, the passed in challenge is present, the tag Tag::ATTESTATION_APPLICATION_ID is set to the expected Android application, the device has verified boot enabled, each certificate in the chain is signed by its successor, none of the certificates have been revoked, and so on.

It is not strictly necessary to use this method to provision a credential if the issuing authority doesn't care about the nature of the security hardware. If called, however, this method must be called before personalize(android.security.identity.PersonalizationData).

Parameters
`challenge`	`byte`: is a non-empty byte array whose contents should be unique, fresh and provided by the issuing authority. The value provided is embedded in the attestation extension and enables the issuing authority to verify that the attestation certificate is fresh. Implementations are required to support challenges at least 32 bytes of length. This value cannot be `null`.

Returns
`Collection<X509Certificate>`	the X.509 certificate for this credential's CredentialKey. This value cannot be `null`.

personalize

Added in API level 30

public abstract byte[] personalize (PersonalizationData personalizationData)

Stores all of the data in the credential, with the specified access control profiles.

This method returns a COSE_Sign1 data structure signed by the CredentialKey with payload set to ProofOfProvisioning as defined below.

     ProofOfProvisioning = [
          "ProofOfProvisioning",        ; tstr
          tstr,                         ; DocType
          [ * AccessControlProfile ],
          ProvisionedData,
          bool                          ; true if this is a test credential, should
                                        ; always be false.
      ]

      AccessControlProfile = {
          "id": uint,
          ? "readerCertificate" : bstr,
          ? (
               "userAuthenticationRequired" : bool,
               "timeoutMillis" : uint,
          )
      }

      ProvisionedData = {
          * Namespace => [ + Entry ]
      },

      Namespace = tstr

      Entry = {
          "name" : tstr,
          "value" : any,
          "accessControlProfiles" : [ * uint ],
      }

This data structure provides a guarantee to the issuer about the data which may be returned in the CBOR returned by ResultData.getAuthenticatedData() during a credential presentation.

Parameters
`personalizationData`	`PersonalizationData`: The data to provision, including access control profiles and data elements and their values, grouped into namespaces. This value cannot be `null`.

Returns
`byte[]`	A COSE_Sign1 data structure, see above. This value cannot be `null`.