def encrypt_key(password, salt)
      iterations, length = CRYPTERATIONS, HASH_BYTE_SIZE
      OpenSSL::PKCS5::pbkdf2_hmac_sha1(password, salt, iterations, length)
    end
def encrypt_key(password, salt)
      iterations, length = CRYPTERATIONS, HASH_BYTE_SIZE
      OpenSSL::PKCS5::pbkdf2_hmac_sha1(password, salt, iterations, length)
    end
Convert the password into a PBKDF2-HMAC-SHA1 salted key used for safely
 encrypting and decrypting all your ciphers strings.

 @api private