portal-lib 0.1.0

A Secure file transfer library, written in Rust. The library utilizes SPAKE2 for key negotiation over an insecure channel, and ChaCha20Poly1305 Authenticated Encryption to encrypt the file with the derived shared symmetric key. This enables two peers to transfer a file over any channel without needing to trust the intermediary relay.
Documentation 
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use thiserror::Error;
use std::io;

#[derive(Error, Debug)]
pub enum PortalError {
    #[error("Value doesn't exist")]
    NoneError,
    #[error("Incorrect Mutability")]
    Mutability,
    #[error("Bad registration")]
    BadRegistration,
    #[error("No state initialized")]
    BadState,
    #[error("No peer confirmed")]
    NoPeer,
    #[error("KeyDerivationFailed")]
    BadMsg,
    #[error("EncryptError")]
    EncryptError,
    #[error("Interrupted")]
    Interrupted,
    #[error("WouldBlock")]
    WouldBlock,
    #[error("Disconnected")]
    Disconnect(#[from] io::Error),
}


pub fn underlying_io_error_kind(error: &anyhow::Error) -> Option<io::ErrorKind> {
    for cause in error.chain() {
        if let Some(io_error) = cause.downcast_ref::<io::Error>() {
            return Some(io_error.kind());
        }
    }
    None
}