Safe Password Entry for R, Git, and SSH
Cross-platform utilities for prompting the user for credentials or a passphrase, for example to authenticate with a server or read a protected key. Includes native programs for MacOS and Windows, hence no 'tcltk' is required. Password entry can be invoked in two different ways: directly from R via the askpass() function, or indirectly as password-entry back-end for 'ssh-agent' or 'git-credential' via the SSH_ASKPASS and GIT_ASKPASS environment variables. Thereby the user can be prompted for credentials or a passphrase if needed when R calls out to git or ssh.
Called from R
To invoke the password prompt manually use:
This is used for example to read protected key files:
library(openssl) key <- rsa_keygen() write_pem(key, 'testkey.pem', password = 'supersecret') read_key('testkey.pem')
Called from SSH / Git
The package also configures itself as the password entry back-end for ssh-agent and git-credential. The easiest way to test this is using the credentials package: