Struct mpc_engine::primitives::ot::OTReceiver

pub struct OTReceiver { /* private fields */ }

The state of the receiver

Implementations

impl OTReceiver

pub fn select( entropy: &mut Randomness, dst: &[u8], sender_message: OTSenderInit, choose_left: bool ) -> Result<(Self, OTReceiverSelect), Error>

Generate the first receiver message.

Initiates the OT receiver by generating a random P256 Scalar x which is used to mask the receivers choice bit c of output in the computation of the masked receiver selection R = cS + xB, where S is obtained from the initial sender message. The values required in the decryption of the sender messages are stored in the OTReceiver struct and the masked choice is wrapped in an OTReceiverSelect message for sending to the sender.

pub fn receive(&self, sender_message: OTSenderSend) -> Result<Vec<u8>, Error>

Receive the selected input from the sender.

A decryption key is generated based on the initialization message received from the sender and the masked choice generated during receiver initialization. Then trial-decryption of the sender messages are attempted. Correctness of the protocol guarantees that one decryption will be successful (exactly one, by security of the protocol) and will yield the receiver’s chosen output ending the OT session for the receiver.