To cite package ‘openssl’ in publications use:

  Ooms J (2024). _openssl: Toolkit for Encryption, Signatures and
  Certificates Based on OpenSSL_. R package version 2.2.1,
  <https://github.com/jeroen/openssl>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {openssl: Toolkit for Encryption, Signatures and Certificates Based on
OpenSSL},
    author = {Jeroen Ooms},
    year = {2024},
    note = {R package version 2.2.1},
    url = {https://github.com/jeroen/openssl},
  }