makeTag converts a four character string into a Roughtime tag value.

ParseRequest resolves the supported versions indicated by the client and parses the values required to produce a response.

CreateRequest creates a Roughtime request given an entropy source and the contents of a previous reply for chaining. If this request is the first of a

Now returns the time provided by a Roughtime response.

CreateReplies signs, using privateKey, a batch of nonces along with the given time and radius. It returns one reply for each nonce using that signatur

VerifyReply parses the Roughtime reply in replyBytes, authenticates it using publicKey and verifies that nonce is included in it. It returns the inclu

Decode parses the output of encode back into a map of tags to bytestrings.

Encode converts a map of tags to bytestrings into an encoded message. The number of elements in msg and the sum of the lengths of all the bytestrings

SetLogger sets the logger used to log the output of Do and DoFromFile. If l == nil, then no output will be logged.

LoadConfig reads and parses a JSON-encoded string from configFile.

NewCertificate returns a signed certificate, using rootPrivateKey, delegating authority for the given timestamp to onlinePrivateKey.

Select a certificate suitable for responding to the request.

nonceSize returns the nonce length.

CalculateChainNonce fills the `nonce` buffer with the nonce used in the next request in a chain given a reply and a blinding factor. The length of the

Error returns the error resulting from the query, if any.

MedianDeltaWithRadiusThresh computes the median difference between t0 and the time reported by each server, rejecting responses whose uncertainty radi

ResponseVersionFromSupported selects a version to use from the list of versions supported by the clients. Returns an error if the input slice is zero-

advertisedVersionsFromPreference derives the list of versions advertised in its request by a client with the given preferences. If len(versionPrefere

hashNode hashes two child elements of the Merkle tree to produce an interior node.

Do requests Roughtime from a sequence of servers in order. If the request fails, then the error is recorded. The nonce of each request is computed fro

DoFromFile loads a sequence of server configurations from configFile and requests Roughtime from them in order.

Get sends a request to a server and verifies the response. It makes at most as many attempts as specified, waiting for the given amount of time for ea

Verify returns true if the chain is valid. A chain is valid if for each link in the chain, (1) the signature in the server's response is valid, and (2

decodeFramed determines if the requester is a legacy client (Google-Roughtime) or supports the IETF version. In the later case, it removes the IETF me

encodeFramed adds IETF message framing to a message.

getVersionPreferenceForServer resolves the client's version preference based on the server's configuration.

hashLeaf hashes an nonce to form the leaf of the Merkle tree.

serverUDPAddr attempts to resolve the UDP address specified by the server configution.

BytesForVersion returns a serialized certificate compatible with the given version. Legacy clients (Google-Roughtime) expect a non-standard encoding o

NewTestRand returns an instance of TestRand.

ParseConfig loads parses a JSON-encoded Roughtime-server configuration, skipping those servers that the client doesn't support. It returns the sequenc

Path returns elements from t needed to prove, given the root, that the leaf at the given index is in the tree.

Root returns the root value of t.

messageOverhead returns the number of bytes needed for Encode to encode the given number of tags.

newTree creates a Merkle tree given one or more nonces.

Levels returns the number of levels in t.

NewChain returns a Roughtime chain comprised of the successful queries in a sequence of results.

Test that if no version preference is specified, then the client defaults to IETF-Roughtime.

Test that tag constants match values in the tag registry (draft-ietf-ntp-roughtime-08, Section 12.3)