Simple encrypt decrypt strings in ruby

encrypt_decrypt.rb

require 'openssl'

def encrypt_string(str)
  cipher_salt1 = 'some-random-salt-'
  cipher_salt2 = 'another-random-salt-'
  cipher = OpenSSL::Cipher.new('AES-128-ECB').encrypt
  cipher.key = OpenSSL::PKCS5.pbkdf2_hmac_sha1(cipher_salt1, cipher_salt2, 20_000, cipher.key_len)
  encrypted = cipher.update(str) + cipher.final
  encrypted.unpack('H*')[0].upcase
end

def decrypt_string(encrypted_str)
  cipher_salt1 = 'some-random-salt-'
  cipher_salt2 = 'another-random-salt-'
  cipher = OpenSSL::Cipher.new('AES-128-ECB').decrypt
  cipher.key = OpenSSL::PKCS5.pbkdf2_hmac_sha1(cipher_salt1, cipher_salt2, 20_000, cipher.key_len)
  decrypted = [encrypted_str].pack('H*').unpack('C*').pack('c*')

  cipher.update(decrypted) + cipher.final
end

enc = encrypt_string('string-to-encrypt') #=> "8F22010F2ABEC116345274374C444F502530D37ABA018CA7F49EC6CA1053FBD7"
dec = decrypt_string(enc) #=> "string-to-encrypt"