Webcryptobox

WebCrypto compatible encryption with Bash and OpenSSL.

This CLI handles the Webcryptobox encryption API.

Compatible packages:

• wcb JavaScript
• wcb Rust

See Webcryptobox Bash for the library.

Requirements

This script relies the following packages:

• OpenSSL
• cat, grep and xxd

Make sure they're installed on your system and globally callable.

Usage

Call the wcb.sh script for usage information:

$ ./wcb.sh 
Usage: ./wcb.sh <COMMAND> [OPTIONS] [ARGUMENTS]

Symmetric encryption commands:
  key                                 - Generate symmetric key
  encrypt <KEY> [FILENAME]            - Encrypt message. Message either read from FILENAME or STDIN.
  decrypt <KEY> [FILENAME]            - Decrypt box. Box either read from FILENAME or STDIN.

Asymmetric encryption commands:
  private-key                         - Generate private key
  public-key [FILENAME]               - Get corresponding public key from private key, either specified via FILENAME or read from STDIN
  fingerprint [-h <HASH>] [FILENAME]  - Calculate fingerprint of public key, either specified via FILENAME or read from STDIN.
                                        You can use -h to specify the hash function, can be sha1 or sha256 (default).

  derive-key <PRIVATE_KEY> [PUBLIC_KEY]
                                      - Derive symmetric key from private and public key.
                                        Public key either specified via PUBLIC_KEY or read from STDIN.
  derive-password [-l LENGTH] <PRIVATE_KEY> [PUBLIC_KEY]
                                      - Derive password from private and public key.
                                        Use LENGTH from options, otherwise 128 bits.
                                        Public key either specified via PUBLIC_KEY or read from STDIN.

  encrypt-private-key <PASSWORD> [FILENAME]
                                      - Encrypt private key with password. Key either read from FILENAME or STDIN.
  decrypt-private-key <PASSWORD> [FILENAME]
                                      - Decrypt private key with password. Key either read from FILENAME or STDIN.

  encrypt-private-key-to <PRIVATE_KEY> <PUBLIC_KEY> [FILENAME]
                                      - Encrypt private key with private and public key. Private key either read from FILENAME or STDIN.
  decrypt-private-key-from <PRIVATE_KEY> <PUBLIC_KEY> [FILENAME]
                                      - Decrypt private key with private and public key. Private key either read from FILENAME or STDIN.

  encrypt-to <PRIVATE_KEY> <PUBLIC_KEY> [FILENAME]
                                      - Encrypt message with private and public key. Message either read from FILENAME or STDIN.
  decrypt-from <PRIVATE_KEY> <PUBLIC_KEY> [FILENAME]
                                      - Decrypt box with private and public key. Box either read from FILENAME or STDIN.

Note that keys and passwords are provided via arguments and therefore are visible eg. in ps, so that's not recommended if you need strong security. Reach out to me if using environment variables instead would be good fit, I'd be happy to add it.

License

This project is licensed under the Apache 2.0 License.

© 2022 Johannes J. Schmidt