Cryptographic specifications

The initial key exchange is performed with elliptic-curve Diffie-Hellman. General data exchange is encrypted with AES-GCM. During regular communication payloads are Base64 encoded before being encrypted to prevent delimiter conflicts. SHA-256 hashes of files are compared to ensure data integrity.

Usage

Build the optimized binary with cargo build --release.

Server

Usage: contego host [OPTIONS] --key <KEY> <--source <SOURCE>|--files <FILES>...>

Options:
  -k, --key <KEY>              Access key
  -s, --source <SOURCE>        Path to a source file (alternative to --files)
  -f, --files <FILES>...       Paths to shareable files (alternative to --source)
  -p, --port <PORT>            Host port [default: 8080]
  -6, --ipv6                   IPv6 instead of IPv4
  -c, --chunksize <CHUNKSIZE>  Transmit chunksize in bytes [default: 8192]
  -l, --local                  Host locally
  -h, --help                   Print help

Client

Usage: contego connect --addr <ADDR> --out <OUT> --key <KEY>

Options:
  -a, --addr <ADDR>  IP address of the instance
  -o, --out <OUT>    Path to an output folder
  -k, --key <KEY>    Access key
  -h, --help         Print help