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comp.lang.ruby

cryptography (RSA

Rodrigo Dominguez

9/22/2006 9:01:00 PM

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:
ãå�dg[0l?�gª�¤½C¶(Ayy2�zeõt
A�e:vb¶Uu<²`
é%fi­`czÏ�¯
-----------------------------------------------
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?


--
Posted via http://www.ruby-....
5 Answers

Rodrigo Dominguez

9/22/2006 9:02:00 PM

0

the title should be: Cryptography (AES)
sorry

--
Posted via http://www.ruby-....

Roland Schmitt

9/25/2006 7:43:00 AM

0

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:
> ãå�dg[0l?�gª�¤½C¶(Ayy2�zeõt
> A�e:vb¶Uu<²`
> é%fi­`czÏ�¯
> -----------------------------------------------
> 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

Rodrigo Dominguez

9/25/2006 2:04:00 PM

0

> 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

thank you very much for the answer, I didn't know about the key length
and the iv vector, I will try again, thank you

--
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Rodrigo Dominguez

9/25/2006 2:55:00 PM

0

> 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

I did as you say, and I'm still having different results... I'm really
lost
If I encrpyt anything with ruby and decrypt it with ruby, it works
great, the same with php, but if I encrypt anything with ruby and try to
decrypt it with php, it doesn't work

ruby code for encryption
-----------------------------------
require 'openssl'

text = "abcdefghijklmnopqrstuvwxyz"
key = "1234567890123456"
alg = "AES-128-ECB"
iv = "6543210987654321"
file_name = "ruby.encrypted"
file_name_2 = "ruby.decrypted"

puts %(clear text: "#{text}")
puts %(symmetric key: "#{key}")
puts %(initialization vector: "#{iv}")
puts %(cipher alg: "#{alg}")

puts "--Encrypting--"
des = OpenSSL::Cipher::Cipher.new(alg)
des.encrypt
des.key = key
des.iv = iv
cipher = des.update(text)
cipher << des.final
puts %(encrypted text: #{cipher})
puts

file = File.open(file_name, "w")
file.truncate(0)
file << cipher
file.close
-----------------------------------
ruby code for decryption
-----------------------------------
require 'openssl'

text = "abcdefghijklmnopqrstuvwxyz"
key = "1234567890123456"
alg = "AES-128-ECB"
iv = "6543210987654321"
file_name = "ruby.encrypted"
file_name_2 = "ruby.decrypted"

puts %(clear text: "#{text}")
puts %(symmetric key: "#{key}")
puts %(initialization vector: "#{iv}")
puts %(cipher alg: "#{alg}")

file = File.open(file_name, "r")
text = file.read(999999)
file.close

puts "--Decrypting--"
des = OpenSSL::Cipher::Cipher.new(alg)
des.decrypt
des.key = key
des.iv = iv
out = des.update(text)
out << des.final
puts %(decrypted text: "#{out}")
puts

file = File.open(file_name_2, "w")
file.truncate(0)
file << des.final
file.close
-----------------------------------
php code for encryption
-----------------------------------
$text = "abcdefghijklmnopqrstuvwxyz";
$key = "1234567890123456";
$alg = "rijndael-128";
$iv = "6543210987654321";
$file_name = "php.encrypted";
$file_name_2 = "php.decrypted";
$mode = "ecb";

echo("clear test: $text\n");
echo("symmetric key: $key\n");
echo("initialization vector: $iv\n");
echo("cipher alg: $alg\n");

$td = mcrypt_module_open($alg, NULL, $mode, NULL);
$iv = mcrypt_create_iv (mcrypt_enc_get_iv_size($td), $iv);
mcrypt_generic_init($td, $key, $iv);
$result = mcrypt_generic($td, $text);
mcrypt_generic_deinit($td);
mcrypt_module_close($td);

echo "result: $result\n";

$file = fopen($file_name, "w");
fwrite($file, $result);
fclose($file);
-----------------------------------
php code for decryption
-----------------------------------
$text = "abcdefghijklmnopqrstuvwxyz";
$key = "1234567890123456";
$alg = "rijndael-128";
$iv = "6543210987654321";
$file_name = "php.encrypted";
$file_name_2 = "php.decrypted";
$mode = "ecb";

$file = fopen($file_name, "r");
$text = fread($file, filesize($file_name));
fclose($file);

echo("clear test: $text\n");
echo("symmetric key: $key\n");
echo("initialization vector: $iv\n");
echo("cipher alg: $alg\n");

$td = mcrypt_module_open($alg, NULL, $mode, NULL);
$iv = mcrypt_create_iv (mcrypt_enc_get_iv_size($td), $iv);
mcrypt_generic_init($td, $key, $iv);
$result = mdecrypt_generic($td, $text);
mcrypt_generic_deinit($td);
mcrypt_module_close($td);

echo "result: $result\n";

$file = fopen($file_name_2, "w");
fwrite($file, $result);
fclose($file);
-----------------------------------




--
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Patrick Toomey

9/25/2006 3:20:00 PM

0


On Monday, September 25, 2006, at 09:55AM, Rodrigo Dominguez <rorra@rorra.com.ar> wrote:

>> 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.
>>

Hello,
I am coming into this conversation in the middle, but a quick googling found the following discussion. http://www.bigbold.com/snippets/post...
In this thread they talk about ruby openssl expecting the key to come in as a binary data, not a simple string of hex digits. I'll paste a relevant quote from the linked thread...

####BEGIN QUOTE HERE####
"
binary_data = unpack('a2'*32).map{|x| x.hex}.pack('c'*32)

The "unpack" call assumes you have 32 pairs of hex digits (the 'a2' bit will match a two digit hex number). Change the '32' to match however many hex numbers are in your string. The "map" call creates an array from the unpacked string, with the 32 two-digit hex numbers converted into 32 decimal numbers. The "pack" call takes this array of 32 integers and converts it into a packed stream of 32 bytes."
####END QUOTE HERE####

Hope this helps somewhat.
Patrick