From: Vance Heron <heron@...>
Date: 2004-04-16T03:00:45+09:00
Subject: Re: openssl ciphers

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Thank you for the quick response.

This seems better, but I'm still not getting the desired answer.

I'm using ruby-1.8.1 on  Redhat 7.3 system.
Same system used for both Ruby and C versions ...

Here are two short example
programs - first in C, giving the correct answer

The C compilation line is
gcc sample1.c -lssl -o sample1

--- sample1.c ---
#include <openssl/des.h>

void dmp_blk(int l, char *b)
{
int i;
  for (i=3D0; i<l; i++) printf ("%02x ",(b[i] & 0xFF));
  printf ("\n");
}

main(int argc, char *argv[])
{

char magic[]=3D"KGS!@#$%";
char key1[]=3D"R=A2Qk%*Qa";
des_key_schedule sked;
unsigned char res[9];

  /* encrypt magic w/DES Key 1 */
  des_set_key_checked((const_des_cblock *)key1, sked);
  des_ecb_encrypt((const_des_cblock *) magic, \
    (const_des_cblock *)res, sked, 1);

  printf ("Results of DES encryption\n");
  printf ("Key: %s Plaintext: %s\n", key1, magic);
  dmp_blk(8,res);
}
--- end of sample1.c ---

Then in ruby - giving a different answer

--- sample1.rb ---
#! /usr/bin/env ruby

require 'openssl'

class String
  def dmp_blk=20
     self.each_byte {|c| printf("%02x ",c)}
     printf ("\n")
  end=20
end

  magic =3D 'KGS!@#$%'
  key1 =3D 'R=A2Qk%*Qa'

  des =3D OpenSSL::Cipher::Cipher.new("DES-ECB")
  des.key =3D key1
  des.encrypt(magic)
  res =3D des.final

  puts "Results of DES encryption"
  puts "Key: #{key1} Plaintext: #{magic}"
  res.dmp_blk
--- end of sample1.rb ---

--- results from C version ---
$ sample1
Results of DES encryption
Key: R=A2Qk%*Qa Plaintext: KGS!@#$%
ff 37 50 bc c2 b2 24 12=20
$

--- results from ruby version
$ sample1.rb
Results of DES encryption
Key: R=A2Qk%*Qa Plaintext: KGS!@#$%
ff c4 20 c7 c2 f9 74 e3=20
$

On Thu, 2004-04-15 at 02:49, ts wrote:

> >>>>> "V" =3D=3D Vance Heron <heron@jpl.nasa.gov> writes:
>=20
> V> Here's the ruby code segment I'm using...
> V>   des =3D OpenSSL::Cipher::Cipher.new("DES")
> V>   des.encrypt( key1 )
> V>   res1 =3D des.update( magic )
> V>   res1 << des.final=20
>=20
>  Well, probably I've not understood but you don't want this ?
>=20
>    des =3D OpenSSL::Cipher::Cipher.new("DES-ECB")
>    des.key =3D key1
>    des.encrypt(magic)
>    p des.final
>=20
>=20
> Guy Decoux



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