//!
//! An implementation of the [Roughtime](https://roughtime.googlesource.com/roughtime) 
//! secure time synchronization protocol.
//!

extern crate byteorder;

mod error;
mod tag;
mod message;

pub mod hex;

pub use error::Error;
pub use tag::Tag;
pub use message::RtMessage;

//  Constants and magic numbers of the Roughtime protocol
//  
    /// Minimum size (in bytes) of a client request
    pub const MIN_REQUEST_LENGTH: u32 = 1024;

    /// Minimum size (in bytes) of seeds used to derive private keys
    pub const MIN_SEED_LENGTH: u32 = 32;

    /// Size (in bytes) of an Ed25519 public key
    pub const PUBKEY_LENGTH: u32 = 32;

    /// Size (in bytes) of the client's nonce
    pub const NONCE_LENGTH: u32 = 64;

    /// Size (in bytes) of an Ed25519 signature
    pub const SIGNATURE_LENGTH: u32 = 64;

    /// Size (in bytes) of server's timestamp value
    pub const TIMESTAMP_LENGTH: u32 = 8;

    /// Size (in bytes) of server's time uncertainty value
    pub const RADIUS_LENGTH: u32 = 4;

    /// Prefixed to the server's certificate before generating or verifying certificate's signature
    pub const CERTIFICATE_CONTEXT: &str = "RoughTime v1 delegation signature--\x00";

    /// Prefixed to the server's response before generating or verifying the server's signature
    pub const SIGNED_RESPONSE_CONTEXT: &str = "RoughTime v1 response signature\x00";

    /// Value prepended to leaves prior to hashing
    pub const TREE_LEAF_TWEAK: u8 = 0x00;

    /// Value prepended to nodes prior to hashing
    pub const TREE_NODE_TWEAK: u8 = 0x01;