Protocol Documentation

v1/keytransparency.proto

BatchGetUserIndexRequest

BatchGetUserIndexRequest identifies a set of users.

Field	Type	Label	Description
directory_id	string		directory_id identifies the directory in which the users live.
user_ids	string	repeated	user_ids are the user identifiers

BatchGetUserIndexResponse

BatchGetUserIndexRequest identifies a single user.

Field	Type	Label	Description
proofs	BatchGetUserIndexResponse.ProofsEntry	repeated	proofs is a map from user_id to its VRF proof. Clients get the index by verifying the VRF proof.

BatchGetUserIndexResponse.ProofsEntry

Field	Type	Label	Description
key	string
value	bytes

BatchGetUserRequest

BatchGetUserRequest contains multiple user_ids to fetch.

Field	Type	Label	Description
directory_id	string		directory_id identifies the directory in which the users live.
user_ids	string	repeated	user_ids are the user identifiers, the format for which is defined by the application.
last_verified	LogRootRequest		last_verified is the last log root the client verified. Omitting this field will omit the log consistency proof from the response.

BatchGetUserResponse

BatchGetUserResponse contains the leaf entries for a set of users at the most recently published revision.

Field	Type	Label	Description
revision	Revision		revision is the most recently published revision.
map_leaves_by_user_id	BatchGetUserResponse.MapLeavesByUserIdEntry	repeated	map_leaves_by_user_id is a map from user_id to the map leaf at the most recently published revision.

BatchGetUserResponse.MapLeavesByUserIdEntry

Field	Type	Label	Description
key	string
value	MapLeaf

BatchListUserRevisionsRequest

BatchListUserRevisionsRequest contains a list of users and a range of revisions.

Field	Type	Label	Description
directory_id	string		directory_id identifies the directory in which the users live.
user_ids	string	repeated	user_ids are the user identifiers.
start_revision	int64		start_revision is the starting revision.
end_revision	int64		end_revision is the ending epoch.
page_size	int32		page_size is the maximum number of entries to return. If page_size is unspecified, the server will decide how to paginate results.
page_token	string		page_token is a continuation token for paginating through results.
last_verified	LogRootRequest		last_verified is the last log root the client verified. Omitting this field will omit the log consistency proof from the response.

BatchListUserRevisionsResponse

BatchListUserRevisionsResponse contains multiple map leaves across multiple revisions.

Field	Type	Label	Description
latest_log_root	LogRoot		latest_log_root contains the latest log root and its consistency proof.
map_revisions	BatchMapRevision	repeated	map_revisions is a list of map revisions. At most page_size revisions will be returned.

BatchMapRevision

BatchMapRevision contains a set of map leaves at a speific revision.

Field	Type	Label	Description
map_root	MapRoot		map_root contains the map root and its inclusion in the log.
map_leaves_by_user_id	BatchMapRevision.MapLeavesByUserIdEntry	repeated	map_leaves_by_user_id contains a mapping from user_id to the map leaf at this revision.

BatchMapRevision.MapLeavesByUserIdEntry

Field	Type	Label	Description
key	string
value	MapLeaf

BatchQueueUserUpdateRequest

BatchQueueUserUpdateRequest enqueues multiple changes to user profiles.

Field	Type	Label	Description
directory_id	string		directory_id identifies the directory in which the users live.
updates	EntryUpdate	repeated	updates contains user updates.

Committed

Committed represents the data committed to in a cryptographic commitment. commitment = HMAC_SHA512_256(key, data)

Field	Type	Label	Description
key	bytes		key is the 16 byte random commitment key.
data	bytes		data is the data being committed to.

Entry

Entry is a signed change to a map entry. Entry contains a commitment to profile and a set of authorized update keys. Entry is placed in the verifiable map as leaf data.

Field	Type	Description
index	bytes	index is the location of this leaf in the sparse merkle tree.
commitment	bytes	commitment is a cryptographic commitment to arbitrary data.
authorized_keyset	bytes	authorized_keys is the tink keyset that validates the signatures on the next entry.
previous	bytes	previous contains the SHA256 hash of SignedEntry.Entry the last time it was modified.

EntryUpdate

EntryUpdate contains the user entry update(s). EntryUpdate will be placed in a Log of mutations.

Field	Type	Description
user_id	string	user_id specifies the id for the user whose profile is being updated.
mutation	SignedEntry	mutation authorizes the change to entry.
committed	Committed	committed contains the data committed to in mutation.commitment.

GetLatestRevisionRequest

GetLatestRevisionRequest identifies a particular revision.

Field	Type	Label	Description
directory_id	string		directory_id is the directory for which revisions are being requested.
last_verified	LogRootRequest		last_verified is the last log root the client verified. Omitting this field will omit the log consistency proof from the response.

GetRevisionRequest

GetRevisionRequest identifies a particular revision.

Field	Type	Description
directory_id	string	directory_id is the directory for which revisions are being requested.
revision	int64	revision specifies the revision number in which mutations will be returned.
last_verified	LogRootRequest	last_verified is the last log root the client verified. Omitting this field will omit the log consistency proof from the response.

GetUserRequest

Gets the leaf entry for a user.

Field	Type	Description
directory_id	string	directory_id identifies the directory in which the user lives.
user_id	string	user_id is the user identifier, the format for which is defined by the application.
last_verified	LogRootRequest	last_verified is the last log root the client verified. Omitting this field will omit the log consistency proof from the response.

GetUserResponse

Contains the leaf entry for a user at the most recently published revision.

Field	Type	Label	Description
revision	Revision		revision is the most recently published revision.
leaf	MapLeaf		leaf is the leaf entry for the requested user.

ListEntryHistoryRequest

ListEntryHistoryRequest gets a list of historical keys for a user.

Field	Type	Description
directory_id	string	directory_id identifies the directory in which the user lives.
user_id	string	user_id is the user identifier.
start	int64	start is the starting revision.
page_size	int32	page_size is the maximum number of entries to return. The server can return fewer entries than requested.
last_verified	LogRootRequest	last_verified is the last log root the client verified. Omitting this field will omit the log consistency proof from the response.

ListEntryHistoryResponse

ListEntryHistoryResponse requests a paginated history of keys for a user.

Field	Type	Label	Description
values	GetUserResponse	repeated	values represents the list of keys this user_id has contained over time.
next_start	int64		next_start is the next page token to query for pagination. next_start is 0 when there are no more results to fetch.

ListMutationsRequest

ListMutationsRequest requests the mutations that created a given revision.

Field	Type	Description
directory_id	string	directory_id is the directory identifier.
revision	int64	revision specifies the revision number.
page_token	string	page_token defines the starting point for pagination. To request the next page, pass next_page_token from the previous response. To start at the beginning, simply omit page_token from the request.
page_size	int32	page_size is the maximum number of mutations to return in a single request. The server may choose a smaller page_size than the one requested.

TODO(gbelvin): Add field mask. |

ListMutationsResponse

ListMutationsResponse contains the mutations that produced an revision.

Field	Type	Label	Description
mutations	MutationProof	repeated	mutations contains the mutation object and the leaf value it operated on.
next_page_token	string		next_page_token is the next page token to query for pagination. An empty value means there are no more results to fetch.

ListUserRevisionsRequest

ListUserRevisionsRequest gets a list of historical keys for a user.

Field	Type	Description
directory_id	string	directory_id identifies the directory in which the user lives.
user_id	string	user_id is the user identifier.
start_revision	int64	start_revision is the starting epoch.
end_revision	int64	end_revision is the ending epoch.
page_size	int32	page_size is the maximum number of entries to return. If page_size is unspecified, the server will decide how to paginate results.
page_token	string	page_token is a continuation token for paginating through results.
last_verified	LogRootRequest	last_verified is the last log root the client verified. Omitting this field will omit the log consistency proof from the response.

ListUserRevisionsResponse

ListUserRevisionsResponse requests a paginated history of keys for a user.

Field	Type	Label	Description
latest_log_root	LogRoot		latest_log_root contains the latest log root and its consistency proof.
map_revisions	MapRevision	repeated	map_revisions represents the list of keys this user_id has contained over time. At most page_size results will be returned.
next_page_token	string		next_page_token is a pagination token which will be set if more than page_size results are available. Clients can pass this value as the page_token in the next request in order to continue pagination.

LogRoot

LogRoot contains the latest log root and its consistency proof.

Field	Type	Label	Description
log_root	trillian.SignedLogRoot		log_root is the latest globally consistent log root.
log_consistency	bytes	repeated	log_consistency proves that log_root is consistent with previously seen roots.

LogRootRequest

LogRootRequest contains the information needed to request and verify LogRoot.

Field	Type	Label	Description
root_hash	bytes		root_hash is the root hash of the last log root the client verified.
tree_size	int64		tree_size is the tree size of the last log root the client verified.

MapLeaf

Leaf entry for a user.

Field	Type	Description
vrf_proof	bytes	vrf_proof is the proof for the VRF on user_id.
map_inclusion	trillian.MapLeafInclusion	map_inclusion is an inclusion proof for the map leaf in an accompanying trillian.SignedMapRoot. If the leaf is non-empty, its leaf.leaf_value stores a serialized Entry proto.
committed	Committed	committed contains the data and nonce used to make a cryptographic commitment, which is stored in the commitment field of the serialized Entry proto from map_inclusion. Note: committed can also be found serialized in map_inclusion.leaf.extra_data.

MapRevision

MapRevision contains a map leaf at a speific revision.

Field	Type	Label	Description
map_root	MapRoot		map_root contains the map root and its inclusion in the log.
map_leaf	MapLeaf		map_leaf contains a leaf and its inclusion proof to map_root.

MapRoot

MapRoot contains the map root and its inclusion proof in the log.

Field	Type	Label	Description
map_root	trillian.SignedMapRoot		map_root contains the signed map root for the sparse Merkle Tree.
log_inclusion	bytes	repeated	log_inclusion proves that map_root is part of log_root at index=map_root.MapRevision.

MapperMetadata

MapperMetadata tracks the mutations that have been mapped so far. It is embedded in the Trillian SignedMapHead.

Field	Type	Label	Description
highest_fully_completed_seq	int64

MutationProof

MutationProof contains the information necessary to compute the new leaf value. It contains a) the old leaf value with it's inclusion proof and b) the mutation. The new leaf value is computed via: Mutate(leaf_value, mutation)

Field	Type	Label	Description
mutation	SignedEntry		mutation contains the information needed to modify the old leaf. The format of a mutation is specific to the particular Mutate function being used.
leaf_proof	trillian.MapLeafInclusion		leaf_proof contains the leaf and its inclusion proof for a particular map revision.

Revision

Revision represents a snapshot of the entire key directory and a diff of what changed between this revision and the previous revision.

Field	Type	Description
directory_id	string	directory_id is the directory identifier.
map_root	MapRoot	map_root contains the map root and its inclusion in the log.
latest_log_root	LogRoot	latest_log_root contains the most recent log root and its consistency proof to the client's last seen log root.

SignedEntry

SignedEntry is a cryptographically signed Entry. SignedEntry will be storead as a trillian.Map leaf.

Field	Type	Label	Description
entry	bytes		entry contains a serialized Entry.
signatures	bytes	repeated	signatures on entry. Must be signed by keys from both previous and current revisions. The first proves ownership of new revision key, and the second proves that the correct owner is making this change. The signature scheme is specified by the authorized_keys tink.Keyset.

UpdateEntryRequest

UpdateEntryRequest updates a user's profile.

Field	Type	Label	Description
directory_id	string		directory_id identifies the directory in which the user lives.
entry_update	EntryUpdate		entry_update contains the user submitted update.

KeyTransparency

The KeyTransparency API represents a directory of public keys.

The API has a collection of directories: /v1/directories/

Each directory has a single sparse merkle tree, append only log, and other public key material that is needed to verify server responses.

Each Directory has a collection of snapshots called revisions: /v1/directories/*/revisions/

Each Revision contains the root of the sparse merkle tree and the changes that occurred that revision and the previous.

Each Revision has a collection of mutations: /v1/directories/*/revisions/*/mutations/.

Each mutation contains the leafvalue of the previous revision that it operated on.
The full set of mutations for an revision allows the receiver to compute the Merkle Tree Root of this revision from the previous revision.

Each Directory has a collection of Users: /v1/directories/*/users/

Each User contains public key material, permissions for who is allowed to change that user, and signatures indicating who made the last change.

Each User also has a collection of historical values for user: /v1/directories/*/users/*/history

Method Name	Request Type	Response Type	Description
GetDirectory	GetDirectoryRequest	Directory	GetDirectory returns the information needed to verify the specified directory.
GetRevision	GetRevisionRequest	Revision	GetRevision returns a SignedMapRoot by the by the requested revision number along with its inclusion proof in the log and the log's consistency proofs.
GetLatestRevision	GetLatestRevisionRequest	Revision	GetLatestRevision returns the latest SignedMapRoot along with its inclusion proof in the log and the log's consistency proofs.
GetRevisionStream	GetRevisionRequest	Revision stream	GetRevisionStream streams new revisions from a requested starting point and continues as new revisions are created.
ListMutations	ListMutationsRequest	ListMutationsResponse	ListMutations returns a list of mutations in a specific revision.
ListMutationsStream	ListMutationsRequest	MutationProof stream	ListMutationsStream is a streaming list of mutations in a specific revision.
GetUser	GetUserRequest	GetUserResponse	GetUser returns a user's leaf entry in the Merkle Tree.
BatchGetUser	BatchGetUserRequest	BatchGetUserResponse	BatchGetUser returns a batch of user leaf entries in the Merkle tree at the same revision.
BatchGetUserIndex	BatchGetUserIndexRequest	BatchGetUserIndexResponse	BatchGetUserIndex returns the VRF proof for a set of userIDs.
ListEntryHistory	ListEntryHistoryRequest	ListEntryHistoryResponse	ListEntryHistory returns a list of historic GetUser values.

Clients verify their account history by observing correct values for their account over time. | | ListUserRevisions | ListUserRevisionsRequest | ListUserRevisionsResponse | ListUserRevisions returns a list of historic leaf values for a user.

Clients should poll GetUser until the update appears, and retry if no update appears after a timeout. | | BatchQueueUserUpdate | BatchQueueUserUpdateRequest | .google.protobuf.Empty | BatchQueueUserUpdate enqueues a list of user profiles. |

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v1/admin.proto

CreateDirectoryRequest

CreateDirectoryRequest creates a new directory

Field	Type	Description
directory_id	string
min_interval	google.protobuf.Duration
max_interval	google.protobuf.Duration
vrf_private_key	google.protobuf.Any	The private_key fields allows callers to set the private key.
log_private_key	google.protobuf.Any
map_private_key	google.protobuf.Any

DeleteDirectoryRequest

DeleteDirectoryRequest deletes a directory

Field	Type	Label	Description
directory_id	string

GarbageCollectRequest

GarbageCollect request.

Field	Type	Label	Description
before	google.protobuf.Timestamp		Soft-deleted directories with a deleted timestamp before this will be fully deleted.

GarbageCollectResponse

Field	Type	Label	Description
directories	Directory	repeated

GetDirectoryRequest

GetDirectoryRequest specifies the directory to retrieve information for.

Field	Type	Label	Description
directory_id	string
show_deleted	bool		showDeleted requests directories that have been marked for deletion but have not been garbage collected.

InputLog

InputLog is an input log for a directory.

Field	Type	Description
directory_id	string
log_id	int64
writable	bool	writable controls whether new log items will be sent to this log. writable is not set by ListInputLogs.

ListDirectoriesRequest

ListDirectories request. No pagination options are provided.

Field	Type	Label	Description
show_deleted	bool		showDeleted requests directories that have been marked for deletion but have not been garbage collected.

ListDirectoriesResponse

ListDirectories response contains directories.

Field	Type	Label	Description
directories	Directory	repeated

ListInputLogsRequest

Field	Type	Label	Description
directory_id	string
filter_writable	bool		filter_writable will only return writable logs when set.

ListInputLogsResponse

Field	Type	Label	Description
logs	InputLog	repeated

UndeleteDirectoryRequest

UndeleteDirectoryRequest deletes a directory

Field	Type	Label	Description
directory_id	string

KeyTransparencyAdmin

The KeyTransparencyAdmin API provides the following resources:

Directories Namespaces on which which Key Transparency operates. A directory determines a unique Trillian map to use. It also determines the authentication policies for users and apps within a directory.
- /v1/directories

Method Name	Request Type	Response Type	Description
ListDirectories	ListDirectoriesRequest	ListDirectoriesResponse	ListDirectories returns a list of all directories this Key Transparency server operates on.
GetDirectory	GetDirectoryRequest	Directory	GetDirectory returns the confiuration information for a given directory.
CreateDirectory	CreateDirectoryRequest	Directory	CreateDirectory creates a new Trillian log/map pair. A unique directoryId must be provided. To create a new directory with the same name as a previously deleted directory, a user must wait X days until the directory is garbage collected.
DeleteDirectory	DeleteDirectoryRequest	.google.protobuf.Empty	DeleteDirectory marks a directory as deleted. Directories will be garbage collected after X days.
UndeleteDirectory	UndeleteDirectoryRequest	.google.protobuf.Empty	UndeleteDirectory marks a previously deleted directory as active if it has not already been garbage collected.
ListInputLogs	ListInputLogsRequest	ListInputLogsResponse	ListInputLogs returns a list of input logs for a directory.
CreateInputLog	InputLog	InputLog	CreateInputLog returns a the created log.
UpdateInputLog	InputLog	InputLog	UpdateInputLog updates the write bit for an input log.
GarbageCollect	GarbageCollectRequest	GarbageCollectResponse	Fully delete soft-deleted directories that have been soft-deleted before the specified timestamp.

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v1/frontend.proto

QueueKeyUpdateRequest

QueueKeyUpdateRequest enqueues an update to a user's identity keys.

Field	Type	Description
directory_id	string	directory_id identifies the directory in which the user lives.
user_id	string	user_id specifies the id for the user whose keys are being updated.
key_data	bytes	key_data is the key data to store.

KeyTransparencyFrontend

Manages user keys stored in Key Transparency with a client-friendly API. This service is operated by the application provider, and is authorized to make key changes on users' behalves.

Method Name	Request Type	Response Type	Description
QueueKeyUpdate	QueueKeyUpdateRequest	.google.protobuf.Empty	Enqueues an update to a user's identity keys.

Scalar Value Types

.proto Type	Notes	C++ Type	Java Type	Python Type
double		double	double	float
float		float	float	float
int32	Uses variable-length encoding. Inefficient for encoding negative numbers – if your field is likely to have negative values, use sint32 instead.	int32	int	int
int64	Uses variable-length encoding. Inefficient for encoding negative numbers – if your field is likely to have negative values, use sint64 instead.	int64	long	int/long
uint32	Uses variable-length encoding.	uint32	int	int/long
uint64	Uses variable-length encoding.	uint64	long	int/long
sint32	Uses variable-length encoding. Signed int value. These more efficiently encode negative numbers than regular int32s.	int32	int	int
sint64	Uses variable-length encoding. Signed int value. These more efficiently encode negative numbers than regular int64s.	int64	long	int/long
fixed32	Always four bytes. More efficient than uint32 if values are often greater than 2^28.	uint32	int	int
fixed64	Always eight bytes. More efficient than uint64 if values are often greater than 2^56.	uint64	long	int/long
sfixed32	Always four bytes.	int32	int	int
sfixed64	Always eight bytes.	int64	long	int/long
bool		bool	boolean	boolean
string	A string must always contain UTF-8 encoded or 7-bit ASCII text.	string	String	str/unicode
bytes	May contain any arbitrary sequence of bytes.	string	ByteString	str

Field	Type	Description
directory_id	string	DirectoryId can be any URL safe string.
log	trillian.Tree	Log contains the Log-Tree's info.
map	trillian.Tree	Map contains the Map-Tree's info.
vrf	keyspb.PublicKey	Vrf contains the VRF public key.
min_interval	google.protobuf.Duration	min_interval is the minimum time between revisions.
max_interval	google.protobuf.Duration	max_interval is the maximum time between revisions.
deleted	bool	Deleted indicates whether the directory has been marked as deleted. By its presence in a response, this directory has not been garbage collected.

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