[R] Help with decrypting

[MacQueen, Don]

Thanks, David.

It does read without error using readBin. And using file.info as you
suggest seem to be a step in the right direction (the length of foo agrees
with 'wc -l' on the file). I just get different errors on subsequent
attempts to use it.

(I should have mentioned in the beginning, whatever I do, I'd like it to
work on both Mac and Linux.)

And thanks again to all three of you. I'm about ready to give up on an R
solution, and call an external script as Marc suggests.

-Don

-- 
Don MacQueen

Lawrence Livermore National Laboratory
7000 East Ave., L-627
Livermore, CA 94550
925-423-1062





On 11/9/16, 11:27 AM, "David Winsemius" <dwinsemius at comcast.net> wrote:

>
>> On Nov 9, 2016, at 10:35 AM, MacQueen, Don <macqueen1 at llnl.gov> wrote:
>> 
>> Bob,
>> 
>> Thanks for responding. I've tried the functions in bcrypt, and get, for
>> example,
>> 
>>> infl <- 'path.to.the.encrypted.file'
>>> junk <- 'the.password'
>>> foo <- readLines(infl)
>> Warning message:
>> In readLines(infl) :
>>  incomplete final line found on 'path.to.the.encrypted.file'
>
>I would not have expected that to succeed. readLines drops cr's and lf's
>and it certainly seems possible that those characters might be encrypted
>values randomly sprinkled through the image. What happens when you read
>it as raw? (may need to first get `file.info` to determine file length.)
>
>perhaps something along the lines of
>
>foo <- readBin( infl, "raw", file.info(infl)[1, "size"])
>
>-- 
>David
>
>
>>> tmp <- checkpw(junk, foo)
>> Error in hashpw(password, hash) : Invalid salt
>> 
>> Thus demonstrating that I don't know what I'm doing.
>> 
>> If it's easy to expand, as you mention, I would indeed appreciate it.
>> 
>> -Don
>> 
>> 
>> -- 
>> Don MacQueen
>> 
>> Lawrence Livermore National Laboratory
>> 7000 East Ave., L-627
>> Livermore, CA 94550
>> 925-423-1062
>> 
>> 
>> 
>> 
>> 
>> On 11/7/16, 5:29 PM, "Bob Rudis" <bob at rud.is> wrote:
>> 
>>> Perhaps https://cran.r-project.org/web/packages/bcrypt/index.html
>>> might be of assistance.
>>> 
>>> If not, drop a note back to the list as it'll be trivial to expand on
>>> that to give you an R alternative to Perl.
>>> 
>>> On Mon, Nov 7, 2016 at 5:47 PM, MacQueen, Don <macqueen1 at llnl.gov>
>>>wrote:
>>>> I have a file containing encrypted contents. The contents can be
>>>> decrypted
>>>> using perl, like this:
>>>> 
>>>> open (FILEHANDLE, "/path/to/file")
>>>> chomp ($ciphertext = <FILEHANDLE>);
>>>> 
>>>> 
>>>> use Crypt::CBC;
>>>> $cipher = Crypt::CBC->new( -key    => 'my secret key',
>>>>                           -cipher => 'Blowfish'
>>>>                          );
>>>> 
>>>> $plaintext  = $cipher->decrypt($ciphertext);
>>>> 
>>>> 
>>>> (See http://search.cpan.org/~lds/Crypt-CBC-2.33/CBC.pm)
>>>> 
>>>> M goal is to have the value of $plaintext in an R object, so, is there
>>>> an
>>>> R equivalent to this decrypt() perl function?
>>>> 
>>>> I've found R packages
>>>>  bcrypt
>>>>  sodium
>>>> that appear to have potential, but I don't understand this business
>>>>well
>>>> enough to figure out how to use them, if indeed they can be used, for
>>>> this. Help would be much appreciated.
>>>> 
>>>> Thanks
>>>> -Don
>>>> 
>>>> --
>>>> Don MacQueen
>>>> 
>>>> Lawrence Livermore National Laboratory
>>>> 7000 East Ave., L-627
>>>> Livermore, CA 94550
>>>> 925-423-1062
>>>> 
>>>> ______________________________________________
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>>>> https://stat.ethz.ch/mailman/listinfo/r-help
>>>> PLEASE do read the posting guide
>>>> http://www.R-project.org/posting-guide.html
>>>> and provide commented, minimal, self-contained, reproducible code.
>> 
>> ______________________________________________
>> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide
>>http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>
>David Winsemius
>Alameda, CA, USA
>