Mimic AES_ENCRYPT and AES_DECRYPT functions in Ruby

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From: Joshua Mckinney on 1 Jul 2010 11:34

---

Having no luck with this. Getting the following error when generating
they key in 1.8.7 and 1.9.1. Any help would be much appreciated.



ruby-1.9.1-p378 > key = "test_key"
=> "test_key"
ruby-1.9.1-p378 > final_key = "\0" * 16
=> "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
ruby-1.9.1-p378 > key.length.times do |i|
ruby-1.9.1-p378 > final_key[i%16] ^= key[i]
ruby-1.9.1-p378 ?> end
NoMethodError: undefined method `^' for "\x00":String
from (irb):89:in `block in irb_binding'
from (irb):88:in `times'
from (irb):88

ruby-1.9.1-p378 > final_key
=> "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"





Rob Biedenharn wrote:
> On Mar 24, 2009, at 2:35 AM, Felipe Coury wrote:
>>
>>
>>
>> Posted via http://www.ruby-forum.com/.
>>
>
>
> I'm glad you got it. Your key-building function doesn't need to be
> quite so complex:
>
> def mysql_key2(key)
> final_key = "\0" * 16
> key.length.times do |i|
> final_key[i%16] ^= key[i]
> end
> final_key
> end
>
> Hardly needs any comments now ;-) Just a pointer to the MySQL doc
> perhaps.
>
> irb> mkey2 = mysql_key2(key)
> => "dp&!{\021?pK?G!8[r."
> irb> mkey == mkey2
> => true
>
> -Rob
>
> Rob Biedenharn http://agileconsultingllc.com
> Rob(a)AgileConsultingLLC.com

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

From: Rob Biedenharn on 1 Jul 2010 12:29

---

On Jul 1, 2010, at 11:34 AM, Joshua Mckinney wrote:
> Rob Biedenharn wrote:
>> On Mar 24, 2009, at 2:35 AM, Felipe Coury wrote:
>>> Posted via http://www.ruby-forum.com/.
>>
>> I'm glad you got it. Your key-building function doesn't need to be
>> quite so complex:
>>
>> def mysql_key2(key)
>> final_key = "\0" * 16
>> key.length.times do |i|
>> final_key[i%16] ^= key[i]
>> end
>> final_key
>> end
>>
>> Hardly needs any comments now ;-) Just a pointer to the MySQL doc
>> perhaps.
>>
>> irb> mkey2 = mysql_key2(key)
>> => "dp&!{\021?pK?G!8[r."
>> irb> mkey == mkey2
>> => true
>>
>> -Rob
>>
>> Rob Biedenharn http://agileconsultingllc.com
>> Rob(a)AgileConsultingLLC.com
>
>
> Having no luck with this. Getting the following error when generating
> they key in 1.8.7 and 1.9.1. Any help would be much appreciated.
>
> ruby-1.9.1-p378 > key = "test_key"
> => "test_key"
> ruby-1.9.1-p378 > final_key = "\0" * 16
> => "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
> ruby-1.9.1-p378 > key.length.times do |i|
> ruby-1.9.1-p378 > final_key[i%16] ^= key[i]
> ruby-1.9.1-p378 ?> end
> NoMethodError: undefined method `^' for "\x00":String
> from (irb):89:in `block in irb_binding'
> from (irb):88:in `times'
> from (irb):88
>
> ruby-1.9.1-p378 > final_key
> => "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"

Because in Ruby 1.8.6, "hello"[0] is 104, but in 1.8.7 and 1.9.x,
"hello"[0] is "h"

Change that line to:

final_key[i%16] = (final_key[i%16].ord ^ key[i].ord).chr

And you should get the right answer:

irb> x="hello"
=> "hello"
irb> x[0] = (x[0].ord ^ 0x20).chr
=> "H"
irb> x
=> "Hello"

String#ord gives the Fixnum value of a single-character string.
Fixnum#chr gives the single-character String whose #ord is the Fixnum

(I'm sure the actual docs say that better ;-)

-Rob

Rob Biedenharn
http://agileconsultingllc.com
Rob(a)AgileConsultingLLC.com
http://gaslightsoftware.com
rab(a)GaslightSoftware.com

From: Joshua Mckinney on 1 Jul 2010 12:55

---

Correction: in 1.8.7 no error is produced but the final_key is not
correct:

ruby-1.8.7-p174 > key = "test key"
=> "test key"
ruby-1.8.7-p174 > final_key = "\0" * 16
=> "\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000"
ruby-1.8.7-p174 > key.length.times do |i|
ruby-1.8.7-p174 > final_key[i%16] ^= key[i]
ruby-1.8.7-p174 ?> end
=> 8
ruby-1.8.7-p174 > final_key
=> "test key\000\000\000\000\000\000\000\000"


Joshua Mckinney wrote:
> Having no luck with this. Getting the following error when generating
> they key in 1.8.7 and 1.9.1. Any help would be much appreciated.
>
>
>
> ruby-1.9.1-p378 > key = "test_key"
> => "test_key"
> ruby-1.9.1-p378 > final_key = "\0" * 16
> => "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
> ruby-1.9.1-p378 > key.length.times do |i|
> ruby-1.9.1-p378 > final_key[i%16] ^= key[i]
> ruby-1.9.1-p378 ?> end
> NoMethodError: undefined method `^' for "\x00":String
> from (irb):89:in `block in irb_binding'
> from (irb):88:in `times'
> from (irb):88
>
> ruby-1.9.1-p378 > final_key
> => "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
>
>
>
>
>
--
Posted via http://www.ruby-forum.com/.

From: Joshua Mckinney on 1 Jul 2010 13:01

---

Thanks for the reply, we got rid of the error in 1.9.1 but both 1.9.1
and 1.8.7 produce the wrong final_key

ruby-1.9.1-p378 > final_key
=> "test key\x00\x00\x00\x00\x00\x00\x00\x00"

ruby-1.8.7-p174 > final_key
=> "test key\000\000\000\000\000\000\000\000"

Rob Biedenharn wrote:
> On Jul 1, 2010, at 11:34 AM, Joshua Mckinney wrote:
>>> final_key[i%16] ^= key[i]
>>> => true
>> ruby-1.9.1-p378 > key = "test_key"
>>
>> ruby-1.9.1-p378 > final_key
>> => "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
>
> Because in Ruby 1.8.6, "hello"[0] is 104, but in 1.8.7 and 1.9.x,
> "hello"[0] is "h"
>
> Change that line to:
>
> final_key[i%16] = (final_key[i%16].ord ^ key[i].ord).chr
>
> And you should get the right answer:
>
> irb> x="hello"
> => "hello"
> irb> x[0] = (x[0].ord ^ 0x20).chr
> => "H"
> irb> x
> => "Hello"
>
> String#ord gives the Fixnum value of a single-character string.
> Fixnum#chr gives the single-character String whose #ord is the Fixnum
>
> (I'm sure the actual docs say that better ;-)
>
> -Rob
>
> Rob Biedenharn
> http://agileconsultingllc.com
> Rob(a)AgileConsultingLLC.com
> http://gaslightsoftware.com
> rab(a)GaslightSoftware.com

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

From: Rob Biedenharn on 1 Jul 2010 14:39

---

On Jul 1, 2010, at 1:01 PM, Joshua Mckinney wrote:
> Rob Biedenharn wrote:
>> On Jul 1, 2010, at 11:34 AM, Joshua Mckinney wrote:
>>>> final_key[i%16] ^= key[i]
>>>> => true
>>> ruby-1.9.1-p378 > key = "test_key"
>>>
>>> ruby-1.9.1-p378 > final_key
>>> =>
>>> "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
>>
>> Because in Ruby 1.8.6, "hello"[0] is 104, but in 1.8.7 and 1.9.x,
>> "hello"[0] is "h"
>>
>> Change that line to:
>>
>> final_key[i%16] = (final_key[i%16].ord ^ key[i].ord).chr
>>
>> And you should get the right answer:
>>
>> irb> x="hello"
>> => "hello"
>> irb> x[0] = (x[0].ord ^ 0x20).chr
>> => "H"
>> irb> x
>> => "Hello"
>>
>> String#ord gives the Fixnum value of a single-character string.
>> Fixnum#chr gives the single-character String whose #ord is the Fixnum
>>
>> (I'm sure the actual docs say that better ;-)
>>
>> -Rob
>>
>> Rob Biedenharn
>> http://agileconsultingllc.com
>> Rob(a)AgileConsultingLLC.com
>> http://gaslightsoftware.com
>> rab(a)GaslightSoftware.com
> Thanks for the reply, we got rid of the error in 1.9.1 but both 1.9.1
> and 1.8.7 produce the wrong final_key
>
> ruby-1.9.1-p378 > final_key
> => "test key\x00\x00\x00\x00\x00\x00\x00\x00"
>
> ruby-1.8.7-p174 > final_key
> => "test key\000\000\000\000\000\000\000\000"
>
> --
> Posted via http://www.ruby-forum.com/.
>

What final_key do you expect? You need to post the full code and
input along with the expected value (or what 1.8.6 gives?) in order to
help.

-Rob

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