dhis2-devs team mailing list archive

[Jason Pickering <jason.p.pickering@xxxxxxxxx>]

VBA? Really?

It is pretty simple actually.. Look at the R code and it is "supersimple".
 First you calculate the Java hash code (
http://en.wikipedia.org/wiki/Java_hashCode()) of the user name and wrap
this in curly braces and prepend the desired password. . Since the
algorithm is well documented, I guess a creation of VBA function to do this
should be simple.  Concatenate the password and the hashed username
together, and calculate the MD5 sum of that string. What results is the
salted encrypted password which should work for DHIS2.

But then one either needs to create a series of SQL inserts (userinfo,
users, usermembership, userrolemembers in that order) or I guess use DXF to
import it all. Have done it in R, but not sure I want to try with VBA.  :)

Regards,
Jason





On Fri, Jul 5, 2013 at 5:40 PM, Bob Jolliffe <bobjolliffe@xxxxxxxxx> wrote:

> I suspect what would be really useful is to have a VBA (or whatever the
> .net equivalent is) of this hash algorithm so that it can be easily used
> with excel.
>
> I started picking the spring algorithm with java string hash apart once ..
> got about 80% through then got bored and stuck with java.
>
>
> On 5 July 2013 16:15, Jason Pickering <jason.p.pickering@xxxxxxxxx> wrote:
>
>> Thanks for this. Looks very useful. Another way to do this (which I have
>> mentioned before on the list, is with R). Here are a couple of  R code
>> fragments which I think I have sent previously.
>>
>> #Generate the Java Hash Code. R does not calculate this properly, so we
>> have to revert to using Java for now.
>> javaHashCode<-function(string="") {
>> require(rJava)
>> .jinit()
>> s <- .jnew("java/lang/String", string)
>> .jcall(s,"I","hashCode") }
>>
>> #Start to generate the encrypted passwords
>> genEncryptedPass<-function(password="district",username="admin") {
>> #This is needed for the digest function
>> require(digest)
>> digest(paste0(password,"{",javaHashCode(username),"}"),serialize=FALSE) }
>>
>> #Start to build up the data frame here
>> result<-as.data.frame(cbind(usernames,passwords),stringsAsFactors=FALSE)
>>
>> result$encrypt<-mapply(genEncryptedPass,password=result$passwords,username=result$usernames)
>>
>> So, with these two basic functions (javaHashCode and genEncryptedPass),
>> you can generate the meat of what you need. If you have a list of usernames
>> and passwords (which of course can also be generated in R) in a dataframe
>> called "result", the last line will give you the encrypted password.
>>
>> Using SQL, you can then generate of course some insert statements or DXF
>> to import into DHIS2. If anyone needs more code for this, I can provide
>> some more details. I suspect the same thing could be easily done with other
>> scripting languages as well.
>>
>> I think these Java classes will help but would suggest to abstract out
>> these methods a bit as right now, the DB connection is hard coded?
>>
>> Regards,
>> Jason
>>
>>
>>
>> On Fri, Jul 5, 2013 at 4:26 PM, Ngoc Thanh Nguyen <
>> thanh.hispvietnam@xxxxxxxxx> wrote:
>>
>>> In case you need to expedite creation of thousands of users and
>>> passwords the following classes might help. In essence, all of user
>>> creation steps can be done by sql. However, password hash is a bit tricky
>>> in dhis2 when it depends on Spring Security.
>>>
>>>
>>> https://dl.dropboxusercontent.com/u/63702128/dhis2%20user%20generator/GeneratePassword.java
>>>
>>> https://dl.dropboxusercontent.com/u/63702128/dhis2%20user%20generator/RandomGenerator.java
>>>
>>> After having a list of username and password pairs you can use sql to
>>> fill in users and userinfo tables, plus other germane tables for assigning
>>> orgunit and roles.
>>>
>>> Thanh
>>>
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>>
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>