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ResultData

public abstract class ResultData
extends Object

java.lang.Object
   ↳ androidx.security.identity.ResultData

An object that contains the result of retrieving data from a credential. This is used to return data requested from a IdentityCredential.

Summary

Constants

int STATUS_NOT_IN_REQUEST_MESSAGE

Requested entry wasn't in the request message.

int STATUS_NOT_REQUESTED

Requested entry was not requested.

int STATUS_NO_ACCESS_CONTROL_PROFILES

The requested entry was not retrieved because it was configured without any access control profile.

int STATUS_NO_SUCH_ENTRY

Requested entry does not exist.

int STATUS_OK

Value was successfully retrieved.

int STATUS_READER_AUTHENTICATION_FAILED

The requested entry was not retrieved because reader authentication wasn't performed.

int STATUS_USER_AUTHENTICATION_FAILED

The requested entry was not retrieved because user authentication wasn't performed.

Public methods

abstract byte[] getAuthenticatedData()

Returns a CBOR structure containing the retrieved data.

abstract byte[] getEcdsaSignature()

Returns a digital signature over the DeviceAuthenticationBytes CBOR specified in getAuthenticatedData(), to prove to the reader that the data is from a trusted credential.

abstract byte[] getEntry(String namespaceName, String name)

Gets the raw CBOR data for the value of an entry.

boolean getEntryBoolean(String namespaceName, String name)

Gets the value of an entry.

byte[] getEntryBytestring(String namespaceName, String name)

Gets the value of an entry.

Calendar getEntryCalendar(String namespaceName, String name)

Gets the value of an entry.

long getEntryInteger(String namespaceName, String name)

Gets the value of an entry.

abstract Collection<String> getEntryNames(String namespaceName)

Get the names of all entries.

String getEntryString(String namespaceName, String name)

Gets the value of an entry.

abstract byte[] getMessageAuthenticationCode()

Returns a message authentication code over the DeviceAuthenticationBytes CBOR specified in getAuthenticatedData(), to prove to the reader that the data is from a trusted credential.

abstract Collection<String> getNamespaces()

Gets the names of namespaces with retrieved entries.

abstract Collection<String> getRetrievedEntryNames(String namespaceName)

Get the names of all entries that was successfully retrieved.

abstract byte[] getStaticAuthenticationData()

Returns the static authentication data associated with the dynamic authentication key used to sign or MAC the data returned by getAuthenticatedData().

abstract int getStatus(String namespaceName, String name)

Gets the status of an entry.

Inherited methods

Constants

STATUS_NOT_IN_REQUEST_MESSAGE

public static final int STATUS_NOT_IN_REQUEST_MESSAGE

Requested entry wasn't in the request message.

Constant Value: 3 (0x00000003)

STATUS_NOT_REQUESTED

public static final int STATUS_NOT_REQUESTED

Requested entry was not requested.

Constant Value: 2 (0x00000002)

STATUS_NO_ACCESS_CONTROL_PROFILES

public static final int STATUS_NO_ACCESS_CONTROL_PROFILES

The requested entry was not retrieved because it was configured without any access control profile.

Constant Value: 6 (0x00000006)

STATUS_NO_SUCH_ENTRY

public static final int STATUS_NO_SUCH_ENTRY

Requested entry does not exist.

Constant Value: 1 (0x00000001)

STATUS_OK

public static final int STATUS_OK

Value was successfully retrieved.

Constant Value: 0 (0x00000000)

STATUS_READER_AUTHENTICATION_FAILED

public static final int STATUS_READER_AUTHENTICATION_FAILED

The requested entry was not retrieved because reader authentication wasn't performed.

Constant Value: 5 (0x00000005)

STATUS_USER_AUTHENTICATION_FAILED

public static final int STATUS_USER_AUTHENTICATION_FAILED

The requested entry was not retrieved because user authentication wasn't performed.

Constant Value: 4 (0x00000004)

Public methods

getAuthenticatedData

public abstract byte[] getAuthenticatedData ()

Returns a CBOR structure containing the retrieved data.

This structure - along with the session transcript - may be cryptographically authenticated to prove to the reader that the data is from a trusted credential and getMessageAuthenticationCode() can be used to get a MAC.

The CBOR structure which is cryptographically authenticated is the DeviceAuthenticationBytes structure according to the following CDDL schema: 

   DeviceAuthentication = [
     "DeviceAuthentication",
     SessionTranscript,
     DocType,
     DeviceNameSpacesBytes
   ]

   DocType = tstr
   SessionTranscript = any
   DeviceNameSpacesBytes = #6.24(bstr .cbor DeviceNameSpaces)
   DeviceAuthenticationBytes = #6.24(bstr .cbor DeviceAuthentication)

where 

   DeviceNameSpaces = {
     * NameSpace => DeviceSignedItems
   }

   DeviceSignedItems = {
     + DataItemName => DataItemValue
   }

   NameSpace = tstr
   DataItemName = tstr
   DataItemValue = any

The returned data is the binary encoding of the DeviceNameSpaces structure as defined above.

Returns
byte[] The bytes of the DeviceNameSpaces CBOR structure.

getEcdsaSignature

public abstract byte[] getEcdsaSignature ()

Returns a digital signature over the DeviceAuthenticationBytes CBOR specified in getAuthenticatedData(), to prove to the reader that the data is from a trusted credential. The signature will be made with one of the provisioned dynamic authentication keys. At most one of getMessageAuthenticationCode() or getEcdsaSignature() is implemented.

Returns
byte[] null if not implemented, otherwise a COSE_Sign1 structure with the payload set to the data returned by getAuthenticatedData().

getEntry

public abstract byte[] getEntry (String namespaceName, 
                String name)

Gets the raw CBOR data for the value of an entry. This should only be called on an entry for which the getStatus(String, String) method returns STATUS_OK.

Parameters
namespaceName String: the namespace name of the entry.
name String: the name of the entry to get the value for.
Returns
byte[] the raw CBOR data or null if no entry with the given name exists.

getEntryBoolean

public boolean getEntryBoolean (String namespaceName, 
                String name)

Gets the value of an entry. This should only be called on an entry for which the getStatus(String, String) method returns STATUS_OK.

Parameters
namespaceName String: the namespace name of the entry.
name String: the name of the entry to get the value for.
Returns
boolean a boolean or false if no entry with the given name exists.

getEntryBytestring

public byte[] getEntryBytestring (String namespaceName, 
                String name)

Gets the value of an entry. This should only be called on an entry for which the getStatus(String, String) method returns STATUS_OK.

Parameters
namespaceName String: the namespace name of the entry.
name String: the name of the entry to get the value for.
Returns
byte[] a byte[] or null if no entry with the given name exists.

getEntryCalendar

public Calendar getEntryCalendar (String namespaceName, 
                String name)

Gets the value of an entry. This should only be called on an entry for which the getStatus(String, String) method returns STATUS_OK.

Parameters
namespaceName String: the namespace name of the entry.
name String: the name of the entry to get the value for.
Returns
Calendar a Calendar or null if no entry with the given name exists.

getEntryInteger

public long getEntryInteger (String namespaceName, 
                String name)

Gets the value of an entry. This should only be called on an entry for which the getStatus(String, String) method returns STATUS_OK.

Parameters
namespaceName String: the namespace name of the entry.
name String: the name of the entry to get the value for.
Returns
long a long or 0 if no entry with the given name exists.

getEntryNames

public abstract Collection<String> getEntryNames (String namespaceName)

Get the names of all entries. This includes the name of entries that wasn't successfully retrieved.

Parameters
namespaceName String: the namespace name to get entries for.
Returns
Collection<String> A collection of names or null if there are no entries for the given namespace.

getEntryString

public String getEntryString (String namespaceName, 
                String name)

Gets the value of an entry. This should only be called on an entry for which the getStatus(String, String) method returns STATUS_OK.

Parameters
namespaceName String: the namespace name of the entry.
name String: the name of the entry to get the value for.
Returns
String a String or null if no entry with the given name exists.

getMessageAuthenticationCode

public abstract byte[] getMessageAuthenticationCode ()

Returns a message authentication code over the DeviceAuthenticationBytes CBOR specified in getAuthenticatedData(), to prove to the reader that the data is from a trusted credential.

The MAC proves to the reader that the data is from a trusted credential. This code is produced by using the key agreement and key derivation function from the ciphersuite with the authentication private key and the reader ephemeral public key to compute a shared message authentication code (MAC) key, then using the MAC function from the ciphersuite to compute a MAC of the authenticated data. See section 9.2.3.5 of ISO/IEC 18013-5 for details of this operation.

If the sessionTranscript parameter passed to IdentityCredential.getEntries(byte[], Map, byte[]) was null or the reader ephmeral public key was never set using IdentityCredential.setReaderEphemeralPublicKey(PublicKey), no message authencation code will be produced and this method will return null. At most one of getMessageAuthenticationCode() or getEcdsaSignature() is implemented.

Returns
byte[] A COSE_Mac0 structure with the message authentication code as described above or null if the conditions specified above are not met.

getNamespaces

public abstract Collection<String> getNamespaces ()

Gets the names of namespaces with retrieved entries.

Returns
Collection<String> collection of name of namespaces containing retrieved entries. May be empty if no data was retrieved.

getRetrievedEntryNames

public abstract Collection<String> getRetrievedEntryNames (String namespaceName)

Get the names of all entries that was successfully retrieved. This only return entries for which getStatus(String, String) will return STATUS_OK.

Parameters
namespaceName String: the namespace name to get entries for.
Returns
Collection<String> A collection of names or null if there are no entries for the given namespace.

getStaticAuthenticationData

public abstract byte[] getStaticAuthenticationData ()

Returns the static authentication data associated with the dynamic authentication key used to sign or MAC the data returned by getAuthenticatedData().

Returns
byte[] The static authentication data associated with dynamic authentication key used to MAC the data.

getStatus

public abstract int getStatus (String namespaceName, 
                String name)

Gets the status of an entry. This returns STATUS_OK if the value was retrieved, STATUS_NO_SUCH_ENTRY if the given entry wasn't retrieved, STATUS_NOT_REQUESTED if it wasn't requested, STATUS_NOT_IN_REQUEST_MESSAGE if the request message was set but the entry wasn't present in the request message, STATUS_USER_AUTHENTICATION_FAILED if the value wasn't retrieved because the necessary user authentication wasn't performed, STATUS_READER_AUTHENTICATION_FAILED if the supplied reader certificate chain didn't match the set of certificates the entry was provisioned with, or STATUS_NO_ACCESS_CONTROL_PROFILES if the entry was configured without any access control profiles.

Parameters
namespaceName String: the namespace name of the entry.
name String: the name of the entry to get the value for.
Returns
int the status indicating whether the value was retrieved and if not, why.