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Date: Tue, 27 Sep 2011 19:32:07 +0200
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Subject: Re: Create Content-MD5 hash
From: Moritz Post <mpost@eclipsesource.com>
To: user@couchdb.apache.org
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Hi Robert

No problem. The issue has been solved. So how about validating newly created
documents?

Greets
Moritz

On Tue, Sep 27, 2011 at 5:52 PM, Robert Newson <rnewson@apache.org> wrote:

> Heh, I totally missed that you hadn't converted to hex in the middle,
> sorry.
>
> On 27 September 2011 16:18, Moritz Post <mpost@eclipsesource.com> wrote:
> > Hi Keith
> >
> > Thanks for the hint. I have actually applied it onto a java
> implementation
> > of the hash generation and it produced a correct hash value. Here is my
> > implementation:
> >
> > MessageDigest md5 = MessageDigest.getInstance("MD5");
> > byte[] digest = md5.digest("{ \"valid\": \"json\" }".getBytes());
> > byte[] hash = Base64.encodeBase64(digest);
> > System.out.println(new String(hash));
> >
> > Output: S/OqwXHe0WedNQHMvT4NhQ==
> >
> > It uses Base64 from the apache commons project. I have used that has
> value
> >
> > Now onto my final question: can i also validated the content of a couchdb
> > document i create by uploading a json document?
> >
> > Regards
> > Moritz Post
> >
> > On Tue, Sep 27, 2011 at 4:57 PM, Keith Gable <ziggy@ignition-project.com
> >wrote:
> >
> >> According to RFC2616 (
> >> http://www.w3.org/Protocols/rfc2616/rfc2616-sec14.html),
> >> section 14.15, you need the Base64 encoding of the actual MD5 bits, not
> the
> >> base64 encoding of the hex encoding of MD5 bits.
> >>
> >> In Ruby, after you require the base64 and digest/md5 libraries, you can
> >> generate a Base64 of the raw bits by doing this:
> >>
> >> Base64.encode64(Digest::MD5.digest(your_file_iostream))
> >>
> >>
> >> Hope that helps.
> >>
> >> ---
> >> Keith Gable
> >> A+ Certified Professional
> >> Network+ Certified Professional
> >> Web Developer
> >>
> >>
> >>
> >> On Tue, Sep 27, 2011 at 9:47 AM, Moritz Post <mpost@eclipsesource.com
> >> >wrote:
> >>
> >> > Hi Robert
> >> >
> >> > Thanks for the reply. Using -n does produce a different echo output
> but
> >> it
> >> > does not produce a hash consumable by the couchdb:
> >> >
> >> > $ echo -n 4bf3aac171ded1679d3501ccbd3e0d85 | base64
> >> > NGJmM2FhYzE3MWRlZDE2NzlkMzUwMWNjYmQzZTBkODU=
> >> >
> >> > $ echo 4bf3aac171ded1679d3501ccbd3e0d85 | base64
> >> > NGJmM2FhYzE3MWRlZDE2NzlkMzUwMWNjYmQzZTBkODUK
> >> >
> >> > Using the hash with the = at the end i still get the response:
> >> > {"error":"content_md5_mismatch","reason":"Possible message
> corruption."}
> >> >
> >> > Greets
> >> > Moritz
> >> >
> >> > On Tue, Sep 27, 2011 at 4:19 PM, Robert Newson <rnewson@apache.org>
> >> wrote:
> >> >
> >> > > try
> >> > >
> >> > > echo -n 4bf3aac171ded1679d3501ccbd3e0d85 | base64
> >> > >
> >> > > as echo includes a new line unless you use -n.
> >> > >
> >> > > B.
> >> > >
> >> > > On 27 September 2011 14:29, Moritz Post <mpost@eclipsesource.com>
> >> wrote:
> >> > > > Hallo CouchDB
> >> > > >
> >> > > > I am trying to validate the integrity of data i upload to the
> >> couchdb.
> >> > > > Therefore i provide a valid MD5 hash alongside my PUT request.
> From
> >> > what
> >> > > i
> >> > > > have gathered this md5 has to be base64 encoded. My problem is
> that i
> >> > am
> >> > > not
> >> > > > able to create a valid hash. All i get is:
> >> > > >
> >> > > > {"error":"content_md5_mismatch","reason":"Possible message
> >> > corruption."}
> >> > > >
> >> > > > I am currently experimenting with a CURL based approach but will
> need
> >> > > > to incorporate the hash creation into a java program later. Here
> is
> >> > what
> >> > > is
> >> > > > did do create the md5 hash:
> >> > > >
> >> > > > $ md5sum test.json
> >> > > > 4bf3aac171ded1679d3501ccbd3e0d85  test.json
> >> > > > $ echo 4bf3aac171ded1679d3501ccbd3e0d85 | base64
> >> > > > NGJmM2FhYzE3MWRlZDE2NzlkMzUwMWNjYmQzZTBkODUK
> >> > > >
> >> > > > So i have a hash value and now use it in my PUT request (verbose
> >> > output):
> >> > > >
> >> > > > $ curl -X PUT -H "Content-MD5:
> >> > > NGJmM2FhYzE3MWRlZDE2NzlkMzUwMWNjYmQzZTBkODUK"
> >> > > > -H "Content-Type: application/json" -v -d @test.json
> >> > > >
> >> > >
> >> >
> >>
> http://localhost:5984/test/doc/test.json?rev=3-dd5bf35d8e95a0ccc5e2a1e0adf26ffb
> >> > > > * About to connect() to 192.168.6.168 port 5984 (#0)
> >> > > > *   Trying 192.168.6.168... connected
> >> > > > * Connected to 192.168.6.168 (192.168.6.168) port 5984 (#0)
> >> > > > * Server auth using Basic with user 'admin'
> >> > > >> PUT /test/doc/test.json?rev=3-dd5bf35d8e95a0ccc5e2a1e0adf26ffb
> >> > HTTP/1.1
> >> > > >> User-Agent: curl/7.21.3 (i686-pc-linux-gnu) libcurl/7.21.3
> >> > > OpenSSL/0.9.8o
> >> > > > zlib/1.2.3.4 libidn/1.18
> >> > > >> Host: 192.168.6.168:5984
> >> > > >> Accept: */*
> >> > > >> Content-MD5: NGJmM2FhYzE3MWRlZDE2NzlkMzUwMWNjYmQzZTBkODUK
> >> > > >> Content-Type: application/json
> >> > > >> Content-Length: 19
> >> > > >>
> >> > > > < HTTP/1.1 400 Bad Request
> >> > > > < Server: CouchDB/1.0.2 (Erlang OTP/R14B)
> >> > > > < Date: Tue, 27 Sep 2011 13:23:38 GMT
> >> > > > < Content-Type: text/plain;charset=utf-8
> >> > > > < Content-Length: 73
> >> > > > < Cache-Control: must-revalidate
> >> > > > <
> >> > > > {"error":"content_md5_mismatch","reason":"Possible message
> >> > corruption."}
> >> > > > * Connection #0 to host 192.168.6.168 left intact
> >> > > > * Closing connection #0
> >> > > >
> >> > > > I am running a couchdb 1.0.3.
> >> > > >
> >> > > > The question is: how to properly create a md5 hash that validates
> the
> >> > > > upload.
> >> > > >
> >> > > > Additionally i would like to know if it is only possible to
> validated
> >> > > > attachment uploads or is it also possible to validated the
> uploaded
> >> > json
> >> > > > documents one creates in the couchdb?
> >> > > >
> >> > > > Thank you
> >> > > > Moritz Post
> >> > > >
> >> > > > --
> >> > > > -----------------------------------
> >> > > > Moritz Post
> >> > > > EclipseSource
> >> > > > Email: mpost@eclipsesource.com
> >> > > > Tel: +49-721-66-47-33-33
> >> > > > Fax: +49-721-66-47-33-29
> >> > > > http://www.eclipsesource.com/
> >> > > > ========================= Legal Disclaimer
> >> > > =================================
> >> > > > According to Section 80 of the German Corporation Act
> >> > > > Innoopract Informationssysteme GmbH must indicate the following
> >> > > information:
> >> > > > Address: Stephanienstrasse 20, 76133 Karlsruhe Germany
> >> > > > General Manager: Jochen Krause
> >> > > > Registered Office: Commercial Register Mannheim HRB 107883
> >> > > >
> >> > >
> >> >
> >>
> ============================================================================
> >> > > >
> >> > >
> >> >
> >> >
> >> >
> >> > --
> >> > -----------------------------------
> >> > Moritz Post
> >> > EclipseSource
> >> > Email: mpost@eclipsesource.com
> >> > Tel: +49-721-66-47-33-33
> >> > Fax: +49-721-66-47-33-29
> >> > http://www.eclipsesource.com/
> >> > ========================= Legal Disclaimer
> >> > =================================
> >> > According to Section 80 of the German Corporation Act
> >> > Innoopract Informationssysteme GmbH must indicate the following
> >> > information:
> >> > Address: Stephanienstrasse 20, 76133 Karlsruhe Germany
> >> > General Manager: Jochen Krause
> >> > Registered Office: Commercial Register Mannheim HRB 107883
> >> >
> >> >
> >>
> ============================================================================
> >> >
> >>
> >
> >
> >
> > --
> > -----------------------------------
> > Moritz Post
> > EclipseSource
> > Email: mpost@eclipsesource.com
> > Tel: +49-721-66-47-33-33
> > Fax: +49-721-66-47-33-29
> > http://www.eclipsesource.com/
> > ========================= Legal Disclaimer
> =================================
> > According to Section 80 of the German Corporation Act
> > Innoopract Informationssysteme GmbH must indicate the following
> information:
> > Address: Stephanienstrasse 20, 76133 Karlsruhe Germany
> > General Manager: Jochen Krause
> > Registered Office: Commercial Register Mannheim HRB 107883
> >
> ============================================================================
> >
>


-- 
-----------------------------------
Moritz Post
EclipseSource
Email: mpost@eclipsesource.com
Tel: +49-721-66-47-33-33
Fax: +49-721-66-47-33-29
http://www.eclipsesource.com/
========================= Legal Disclaimer =================================
According to Section 80 of the German Corporation Act
Innoopract Informationssysteme GmbH must indicate the following information:
Address: Stephanienstrasse 20, 76133 Karlsruhe Germany
General Manager: Jochen Krause
Registered Office: Commercial Register Mannheim HRB 107883
============================================================================

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