🔧 Password-based encryption of SEDA key file

[hacheigriega]

🔧 Chore

In addition to storing the SEDA key file in plain text, we will provide a basic password-based encryption flow. Validator node operators can supply a password as an environment variable which is then used by the node to encrypt/decrypt the key file.

• Document env var name and functionality
• When the env var is set and new keys are generated the file that is written to disk is encrypted with the given password
• When the env var is set during regular operation the node will read the contents of the keyfile and attempt to decrypt them with the supplied password.
• When the env var is not set the file is treated as plain text.