libmceliece: CLI

libmceliece

### NAME

mceliece - command-line interface for the libmceliece implementation of the Classic McEliece cryptosystem

### SYNOPSIS

Key generation (for, e.g., `mceliece6960119`):

        mceliece6960119-keypair 5>publickey 9>secretkey

Encapsulation (for, e.g., `mceliece6960119`):

        mceliece6960119-enc >ciphertext 7>sessionkey 4<publickey

Decapsulation (for, e.g., `mceliece6960119`):

        mceliece6960119-dec 7>sessionkey <ciphertext 8<secretkey

### DESCRIPTION

libmceliece is an implementation of the Classic McEliece cryptosystem. The command-line interface for libmceliece provides the following command-line tools:

        mceliece{6960119,6688128,8192128,460896,348864}-keypair
        mceliece{6960119,6688128,8192128,460896,348864}f-keypair
        mceliece{6960119,6688128,8192128,460896,348864}-enc
        mceliece{6960119,6688128,8192128,460896,348864}-dec

Each tool exits 0 on success, nonzero on failure.

These tools allow libmceliece to be easily used from shell scripts. Other languages can also use libmceliece via these tools, but languages typically have good support for FFI and can use the C interface directly.

The details below use `mceliece6960119` as an example.

### KEY GENERATION

Alice runs the `mceliece6960119-keypair` command. This command randomly generates Alice's secret key and Alice's corresponding public key. It writes the public key to file descriptor 5, and then writes the secret key to file descriptor 9.

The `mceliece6960119f-keypair` command is internally more complicated than the `mceliece6960119-keypair` command but provides faster key generation. The commands are interoperable.

### ENCAPSULATION

Bob runs the `mceliece6960119-enc` command. This command reads Alice's public key from file descriptor 4. It randomly generates a ciphertext and the corresponding session key. It writes the ciphertext to stdout, and then writes the session key to file descriptor 7.

### DECAPSULATION

Alice runs the `mceliece6960119-dec` command. This command reads Alice's secret key from file descriptor 8, and then reads a ciphertext from stdin. It computes the corresponding session key, which it writes to file descriptor 7.

### SEE ALSO

mceliece(3)

Version: This is version 2023.02.19 of the "CLI" web page.