From: Roland Schmitt <Roland.Schmitt@...>
Date: 2006-09-25T16:43:04+09:00
Subject: Re: cryptography (RSA)

Rodrigo Dominguez schrieb:
> I trying to do some cryptography between ruby and php, I don't get 
> it!!!!
>
> ruby code:
> ---------------------------------------------
> #!/usr/bin/env ruby
> require 'openssl'
>
> text = "abcdefghijklmnopqrstuvwxyz"
> key = "altakey"
> alg = "AES-128-ECB"
>
> puts %(clear text:    "#{text}")
> puts %(symmetric key: "#{key}")
> puts %(cipher alg:    "#{alg}")
>
> puts "--Encrypting--"
> des = OpenSSL::Cipher::Cipher.new(alg)
> des.encrypt(key)
> cipher =  des.update(text)
> cipher << des.final
> puts %(encrypted text: #{cipher.inspect})
> puts
> ---------------------------------------------
> This is the result:
> "\214\t\303n\320Lz\330\271\252\017\355\036\251|\237\212V\270hq\267X\204\261\3327t\345\353\324\364"
> ---------------------------------------------
> what is that? \214????\t\303n?
>
>
> this is the php code:
> -----------------------------------------------
> <?php
>
> $crypt = 
> '\214\t\303n\320Lz\330\271\252\017\355\036\251|\237\212V\270hq\267X\204\261\3327t\345\353\324\364';
> $key = "altakey";
>
> echo "crypted content from ruby: " .$crypt . "\n";
> $result = mcrypt_decrypt ( MCRYPT_RIJNDAEL_128 , $key, $crypt, 
> MCRYPT_MODE_ECB);
>
> echo "result: $result\n"
> ?>
> -----------------------------------------------
> this is the result:
>                              ������dg[0l?��g��������C��(Ayy2��ze��t
>           A��e:vb��Uu<��`
> ��%fi��`cz������
> -----------------------------------------------
> wtf????
> -----------------------------------------------
>
> by the way, this is a code to encrypt in php
> -----------------------------------------------
> <?php
>
> $text = "abcdefghijklmnopqrstuvwxyz";
> $key = "altakey";
>
> echo "decrypted content: $text\n";
> echo "key: $key\n";
>
> $result = mcrypt_encrypt ( MCRYPT_RIJNDAEL_128 , $key, $text, 
> MCRYPT_MODE_ECB);
>
> echo "Encrypted text: " . bin2hex($result) . "\n";
>
>
> ?>
> ----------------------------------------------
> this is the result:
> 1fce1c90530b80a27b1af29364ba45759870f1a2341c380dcc48845335d9e575
> ----------------------------------------------
>
> how can I manage that hex data in ruby? any help on anything?
>
>
>   
Hi,

i think that you used the openssl-ruby-bindings in a wrong way.
First, to set the encryption key, you have to use
des.key = key (not des.encrypt(key)).
Second, when using a 128-bit Algorithm, your key must be 128-bit.
Your key is only 8*7=56 bit.
Third, the encryption algorithms not only need the same key, they also 
need the same iv (initialisation vector) to show the same results.
In ruby it is
des.iv = iv.
I bet google shows enough examples how to use openssl in ruby the right way.

Regards,
Roland