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From Keith Gable <zi...@ignition-project.com>
Subject Re: Create Content-MD5 hash
Date Tue, 27 Sep 2011 14:57:01 GMT
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
>
> ============================================================================
>

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