AES-256-CBC encryption - ruby vs node

しばらく前にハマったのでメモ。

$ ruby -v
ruby 2.0.0p451 .....

$ node -v
v0.10.25

Ruby

require 'openssl'
require 'digest'
require 'base64'

def encode(cryptkey, iv, cleardata)
    cipher = OpenSSL::Cipher.new('AES-256-CBC')
    cipher.encrypt
    cipher.key = cryptkey
    cipher.iv  = iv

    encrypted = ''
    encrypted << cipher.update(cleardata)
    encrypted << cipher.final
    Base64.strict_encode64(encrypted)
end

encode w/ Ruby

data = 'The quick brown fox jumps over the lazy dog'
cryptkey = Digest::SHA256.digest('012345678901234567')
iv = '0a1b2c3d4e5f6g7h'
x = encode(cryptkey, iv, data)

=> "SWozLQpQiz2itvbl1PomOPBTvxMmIE6rl4gZlerajsnJrhAfvp6jj5MBSlu+8fle"

Node.js

var crypto = require('crypto');

b64dec = function(data) {
  buf = new Buffer(data, 'base64');
  return buf.toString('binary')
};

decode = function(encrypted_64, cryptkey, iv) {
    var cryptkey = crypto.createHash('sha256').update(cryptkey).digest(),
        decipher = crypto.createDecipheriv('aes-256-cbc', cryptkey, iv),
        decoded  = decipher.update(b64dec(encrypted_64));

    return Buffer.concat([decoded, decipher.final()]);
}

decode w/ Node.js

decode('SWozLQpQiz2itvbl1PomOPBTvxMmIE6rl4gZlerajsnJrhAfvp6jj5MBSlu+8fle',
    '012345678901234567','0a1b2c3d4e5f6g7h').toString()

'The quick brown fox jumps over the lazy dog'