I just want to encrypt a string submitted through a form before saving
it to the DB. And then decrypt it again when I need to retrieve and
use it.
Im trying to use the OpenSSL::Cipher library. I have the following
module for encryption/decryption
[code]
require 'openssl'
module AESCrypt
# Decrypts a block of data (encrypted_data) given an encryption key
# and an initialization vector (iv). Keys, iv's, and the data
# returned are all binary strings. Cipher_type should be
# "AES-256-CBC", "AES-256-ECB", or any of the cipher types
# supported by OpenSSL. Pass nil for the iv if the encryption type
# doesn't use iv's (like ECB).
#:return: => String
#:arg: encrypted_data => String
#:arg: key => String
#:arg: iv => String
#:arg: cipher_type => String
def AESCrypt.decrypt(encrypted_data, key, iv, cipher_type="aes-256-
cbc")
aes = OpenSSL::Cipher::Cipher.new(cipher_type)
aes.decrypt
aes.key = key
aes.iv = iv if iv != nil
aes.update(encrypted_data) + aes.final
end
# Encrypts a block of data given an encryption key and an
# initialization vector (iv). Keys, iv's, and the data returned
# are all binary strings. Cipher_type should be "AES-256-CBC",
# "AES-256-ECB", or any of the cipher types supported by OpenSSL.
# Pass nil for the iv if the encryption type doesn't use iv's (like
# ECB).
#:return: => String
#:arg: data => String
#:arg: key => String
#:arg: iv => String
#:arg: cipher_type => String
def AESCrypt.encrypt(data, key, iv, cipher_type="aes-256-cbc")
aes = OpenSSL::Cipher::Cipher.new(cipher_type)
aes.encrypt
aes.key = key
aes.iv = iv if iv != nil
aes.update(data) + aes.final
end
end
[/code]
And here is the model code where I encrypt and decrypt the string.
[code]
def encrypt_cc_pass
return if cc_pass.blank?
self.cc_pass_key = Time.now.to_s
self.cc_pass_iv = Date.today.to_s
self.encrypted_cc_pass = AESCrypt.encrypt(cc_pass, cc_pass_key,
cc_pass_iv)
end
def decrypted_cc_pass
AESCrypt.decrypt(encrypted_cc_pass, cc_pass_key, cc_pass_iv)
end
[/code]
And this is the error I get
wrong final block length in:config/initializers/aes_crypt.rb:20:in
`final'
Anyone know what im doing wrong here?
Also, Im not able to understand the inners of encryption here. Is
there any gem with good documentation or simpler usage?
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