Struct TSigner

pub struct TSigner(/* private fields */);

Available on crate feature dnssec only.

Struct to pass to a client for it to authenticate requests using TSIG.

Implementations

impl TSigner

pub fn new( key: Vec<u8>, algorithm: TsigAlgorithm, signer_name: Name, fudge: u16, ) -> Result<Self, ProtoError>

Create a new Tsigner from its parts

Arguments

• key - cryptographic key used to authenticate exchanges
• algorithm - algorithm used to authenticate exchanges
• signer_name - name of the key. Must match the name known to the server
• fudge - maximum difference between client and server time, in seconds, see fudge for details

pub fn key(&self) -> &[u8]

Return the key used for message authentication

pub fn algorithm(&self) -> &TsigAlgorithm

Return the algorithm used for message authentication

pub fn signer_name(&self) -> &Name

Name of the key used by this signer

pub fn fudge(&self) -> u16

Maximum time difference between client time when issuing a message, and server time when receiving it, in second. If time is out, the server will consider the request invalid. Longer values means more room for replay by an attacker. A few minutes are usually a good value.

pub fn sign(&self, tbs: &[u8]) -> Result<Vec<u8>, ProtoError>

Compute authentication tag for a buffer

pub fn sign_message( &self, message: &Message, pre_tsig: &TSIG, ) -> Result<Vec<u8>, ProtoError>

Compute authentication tag for a message

pub fn verify(&self, tbv: &[u8], tag: &[u8]) -> Result<(), ProtoError>

Verify hmac in constant time to prevent timing attacks

pub fn verify_message_byte( &self, previous_hash: Option<&[u8]>, message: &[u8], first_message: bool, ) -> Result<(Vec<u8>, Range<u64>, u64), ProtoError>

Verify the message is correctly signed This does not perform time verification on its own, instead one should verify current time lie in returned Range

Arguments

• previous_hash - Hash of the last message received before this one, or of the query for the first message
• message - byte buffer containing current message
• first_message - is this the first response message

Returns

Return Ok(_) on valid signature. Inner tuple contain the following values, in order:

• a byte buffer containing the hash of this message. Need to be passed back when authenticating next message
• a Range of time that is acceptable
• the time the signature was emitted. It must be greater or equal to the time of previous messages, if any

Trait Implementations

impl Clone for TSigner

fn clone(&self) -> TSigner

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl MessageFinalizer for TSigner

fn finalize_message( &self, message: &Message, current_time: u32, ) -> Result<(Vec<Record>, Option<MessageVerifier>), ProtoError>

The message taken in should be processed and then return Records which should be appended to the additional section of the message.

fn should_finalize_message(&self, message: &Message) -> bool

Return whether the message requires further processing before being sent By default, returns true for AXFR and IXFR queries, and Update and Notify messages