This is a small Node.js script for sharing secrets securely. A big goal is to be small enough that one can read and understand every line of it quickly. It currently stands at 72 lines, all in the file secrets.js, with no dependencies (other than Node's standard libraries).

./secrets genkey MYKEY  # produces MYKEY.priv and MYKEY.pub
./secrets encrypt RECIPIENT_KEY.pub
./secrets decrypt MYKEY.priv

Make a key pair with secrets genkey MYKEY, send the public part to the person who has the credentials you want.

$ node secrets.js genkey grist-transfer
Generated key into grist-transfer.priv and grist-transfer.pub

That person will then encrypt a (small) file to send to you with the desired credential:

$ node secrets.js encrypt grist-transfer.pub < msg.txt > to_send.txt

Once you receive a file, decode it using your private key:

$ node secrets.js decrypt grist-transfer.priv < to_send.txt > msg.txt

Done!