~/.subversion/auth/svn.simple/<hash> algorithm?

Question

What is the algorithm for determining the file name in ~/.subversion/auth/svn.simple/ directory?

I am trying to setup subversion to authenticate non-interactively and to have it use an a priori created file for authentication (as opposed to having to authenticate manually for the first time). I cannot configure the server, only the client.

As an experiment, I manually authenticated to see what file is being created. It is trivial for me to create the file ahead of time, but I can't find an obvious way to generate the correct file name. For example:

cat <file> | md5

does not generate the file name :/. Similarly hashing the svn:realmstring or variations thereof fails to generate the correct file name.

In other words, given:

$ cat ~/.subversion/auth/svn.simple/a67f7e17e9b4059f367743be8f30c336

K 8
username
V 3
joe
K 8
password
V 4
blah
K 15
svn:realmstring
V 45
<https://svn.domain.com:443> Joe's repository
END

What do I need to hash in order to get a67f7e17e9b4059f367743be8f30c336?

Answer 1

The answer is to md5 the svn:realmstring.

Given:

<https://svn.apache.org:443> ASF Committers

verify hash via (assuming that your MD5 utility is md5sum for example, on a Mac it is md5)

echo -n "<https://svn.apache.org:443> ASF Committers" | md5sum
> d3c8a345b14f6a1b42251aef8027ab57