encrypt/decrypt confidential file with CAST5 algorithm

make_encrypt_decrypt.md

• Let's encrypt a file conf/config.json from current directory
• Create a file named Makefile with following contents:

.PHONY: _pwd_prompt decrypt_conf encrypt_conf
 
CONF_FILE=conf/config.json
 
# 'private' task for echoing instructions
_pwd_prompt:
        @echo "Contact foo@example.com for the password."
 
# to create conf/config.json
decrypt_conf: _pwd_prompt
        openssl cast5-cbc -d -in ${CONF_FILE}.cast5 -out ${CONF_FILE}
        chmod 600 ${CONF_FILE}
 
# for updating conf/config.json
encrypt_conf: _pwd_prompt
        openssl cast5-cbc -e -in ${CONF_FILE} -out ${CONF_FILE}.cast5

• Now, for encrypting the conf/config.json, run following command from current directory:

make encrypt_conf

• And to decrypt it, run:

make decrypt_conf

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Reference: http://ejohn.org/blog/keeping-passwords-in-source-control/