openssl-cipher is a library to encrypt/decrypt string or file with openssl command.

1. Install openssl command to your system by apt, yum... whatever you desire.

Source code: http://www.openssl.org/source/

2. Put this file into load-path'ed directory, and byte compile it if desired. And put the following expression into your ~/.emacs.

(require 'openssl-cipher)

• To encrypt a well encoded string (High level API)

openssl-cipher-encrypt-string <-> openssl-cipher-decrypt-string

• To encrypt a binary string (Middle level API)

openssl-cipher-encrypt-unibytes <-> openssl-cipher-decrypt-unibytes

• To encrypt a binary string (Low level API)

openssl-cipher-encrypt <-> openssl-cipher-decrypt

• To encrypt a file

openssl-cipher-encrypt-file <-> openssl-cipher-decrypt-file

• To encrypt my secret Please ensure that do not forget clear-string you want to hide.

(defvar my-secret nil)

(let ((raw-string "My Secret"))
  (setq my-secret (openssl-cipher-encrypt-string raw-string))
  (clear-string raw-string))

• To decrypt my-secret

(openssl-cipher-decrypt-string my-secret)