https://github.com/ahf/passphrase-identity

Regenerable ed25519 keys for OpenSSH and OpenPGP.
https://github.com/ahf/passphrase-identity

cryptography ed25519 openpgp openssh privacy

Last synced: 2 months ago
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Regenerable ed25519 keys for OpenSSH and OpenPGP.

• Host: GitHub
• URL: https://github.com/ahf/passphrase-identity
• Owner: ahf
• License: bsd-2-clause
• Created: 2015-08-01T18:51:49.000Z (over 9 years ago)
• Default Branch: develop
• Last Pushed: 2019-11-21T15:34:47.000Z (about 5 years ago)
• Last Synced: 2024-11-01T08:33:01.885Z (3 months ago)
• Topics: cryptography, ed25519, openpgp, openssh, privacy
• Language: C
• Homepage:
• Size: 82 KB
• Stars: 36
• Watchers: 5
• Forks: 5
• Open Issues: 4
• Metadata Files:
  • Readme: README.markdown
  • License: LICENSE

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README

        
# Passphrase Identity

Regenerable ed25519 keys for OpenSSH and OpenPGP.

Passphrase Identity allows you to deterministically generate ed25519 key pairs (signing keys) for OpenSSH and OpenPGP from a set of parameters.

This allows you to (re)generate your key pair on a computer which, for example, lacks persistent storage - it derives an "identity" from a passphrase.

You must be able to remember three things to (re)generate your key pair;

1. A user defined "username", which can be any string.

2. A Passphrase-identity defined "profile" name. There's currently only two profiles available: `2015v1`, and `2017`, both of which use `scrypt()` + `salsa20/8` + `sha256` as KDF.

3. Your personally selected passphrase.

## Usage

    Usage: ./passphrase-identity [ options ] [ output directory ]

    Help Options:

      -h, --help                Display this message (default behavior)

    Key Options:

      -u, --user      Specify which username to use [as salt]

      -p, --profile    Specify which profile to use

      Available Profiles:

          2015v1

          2017

    Output Format Options:

      -s, --openssh             Output OpenSSH public and private key

                                The keys are written to id_ed25519{,.pub}

      -g, --gpg                 Output OpenPGP public and private key

                                The keys are written to {public,private}.asc

## Example Usage

1. We start by creating a key pair for OpenSSH using `[email protected]` as username.

        $ ./passphrase-identity --openssh --user [email protected]

        Passphrase: foobar

        Generating key pair using the '2015v1' profile ...

        This may take a little while ...

        Successfully generated key pair ...

        Saving OpenSSH secret key to id_ed25519 ...

        Saving OpenSSH public key to id_ed25519.pub ...

        $ cat id_ed25519

        -----BEGIN OPENSSH PRIVATE KEY-----

        b3BlbnNzaC1rZXktdjEAAAAABG5vbmUAAAAEbm9uZQAAAAAAAAABAAAAMwAAAAtzc2gtZW

        QyNTUxOQAAACArYR91DYHLCeYb+Ls3wyYsSJrADs7topOSlioZ6GNX2AAAAJj36teu9+rX

        rgAAAAtzc2gtZWQyNTUxOQAAACArYR91DYHLCeYb+Ls3wyYsSJrADs7topOSlioZ6GNX2A

        AAAEAv/A/ak2U1vqbQR7sDFmJFp1eC7kv0HdZYm4Dt50n33ythH3UNgcsJ5hv4uzfDJixI

        msAOzu2ik5KWKhnoY1fYAAAAEWFoZkB0ZW5lby4weDkwLmRrAQIDBA==

        -----END OPENSSH PRIVATE KEY-----

        $ cat id_ed25519.pub

        ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAICthH3UNgcsJ5hv4uzfDJixImsAOzu2ik5KWKhnoY1fY [email protected]

        $ openssl sha256 id_ed25519.pub

        SHA256(id_ed25519.pub)= a394eb08102eefb020d3274285671d113604690bedb551c5dfbf27c0d6844482

2. Wipe the key pair.

        $ shred -u id_ed25519

        $ shred -u id_ed25519.pub

3. Create the key again using the same parameters and passphrase.

        $ ./passphrase-identity --openssh --user [email protected]

        Passphrase: foobar

        Generating key pair using the '2015v1' profile ...

        This may take a little while ...

        Successfully generated key pair ...

        Saving OpenSSH secret key to id_ed25519 ...

        Saving OpenSSH public key to id_ed25519.pub ...

        $ openssl sha256 id_ed25519.pub

        SHA256(id_ed25519.pub)= a394eb08102eefb020d3274285671d113604690bedb551c5dfbf27c0d6844482

## Compiling on Ubuntu

```bash

# if you want to use a proxy for git via https:

# git config --global http.proxy 'socks5://127.0.0.1:9150'

git clone https://github.com/ahf/passphrase-identity

apt-get install autoconf libtool pkg-config libsodium-dev -y

cd passphrase-identity/

./autogen.sh

./configure

make

# Binary will be named ./src/passphrase-identity

```

## Authors

- [Alexander Færøy](https://twitter.com/ahfaeroey) ([[email protected]](mailto:[email protected])).

## Todo

1. Code clean-up. This is a prototype written during two evenings of a weekend.

2. Consider the new Tor ed25519 ID keys?

3. Add proper tests. Use Travis CI to build on both OS X and Linux.

4. Add fancy graphics after key generation, like the OpenSSH client, such that

   the user can quickly identify if something is wrong. 

5. Add cracklib support and remember to make it possible to disable it as well.

## License

See the LICENSE file.